diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-a-text-alternative-to-images-for-visually-impaired-accessibility.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-a-text-alternative-to-images-for-visually-impaired-accessibility.english.md
index 56583fb5e5..2812960de4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-a-text-alternative-to-images-for-visually-impaired-accessibility.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-a-text-alternative-to-images-for-visually-impaired-accessibility.english.md
@@ -24,8 +24,8 @@ Camper Cat happens to be both a coding ninja and an actual ninja, and is buildin
 
 ```yml
 tests:
-  - text: 'Your <code>img</code> tag should have an <code>alt</code> attribute, and it should not be empty.'
-    testString: 'assert($("img").attr("alt"), "Your <code>img</code> tag should have an <code>alt</code> attribute, and it should not be empty.");'
+  - text: Your <code>img</code> tag should have an <code>alt</code> attribute, and it should not be empty.
+    testString: assert($('img').attr('alt'), 'Your <code>img</code> tag should have an <code>alt</code> attribute, and it should not be empty.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-an-accessible-date-picker.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-an-accessible-date-picker.english.md
index 937db0dab8..cfacf91227 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-an-accessible-date-picker.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/add-an-accessible-date-picker.english.md
@@ -25,13 +25,13 @@ Camper Cat is setting up a Mortal Kombat tournament and wants to ask his competi
 ```yml
 tests:
   - text: Your code should add one <code>input</code> tag for the date selector field.
-    testString: 'assert($("input").length == 2, "Your code should add one <code>input</code> tag for the date selector field.");'
+    testString: assert($('input').length == 2, 'Your code should add one <code>input</code> tag for the date selector field.');
   - text: Your <code>input</code> tag should have a <code>type</code> attribute with a value of date.
-    testString: 'assert($("input").attr("type") == "date", "Your <code>input</code> tag should have a <code>type</code> attribute with a value of date.");'
+    testString: assert($('input').attr('type') == 'date', 'Your <code>input</code> tag should have a <code>type</code> attribute with a value of date.');
   - text: Your <code>input</code> tag should have an <code>id</code> attribute with a value of pickdate.
-    testString: 'assert($("input").attr("id") == "pickdate", "Your <code>input</code> tag should have an <code>id</code> attribute with a value of pickdate.");'
+    testString: assert($('input').attr('id') == 'pickdate', 'Your <code>input</code> tag should have an <code>id</code> attribute with a value of pickdate.');
   - text: Your <code>input</code> tag should have a <code>name</code> attribute with a value of date.
-    testString: 'assert($("input").attr("name") == "date", "Your <code>input</code> tag should have a <code>name</code> attribute with a value of date.");'
+    testString: assert($('input').attr('name') == 'date', 'Your <code>input</code> tag should have a <code>name</code> attribute with a value of date.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-carefully-choosing-colors-that-convey-information.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-carefully-choosing-colors-that-convey-information.english.md
index 555177dcdc..572bece89a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-carefully-choosing-colors-that-convey-information.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-carefully-choosing-colors-that-convey-information.english.md
@@ -23,7 +23,7 @@ Camper Cat is testing different styles for an important button, but the yellow (
 ```yml
 tests:
   - text: Your code should change the text <code>color</code> for the <code>button</code> to the dark blue.
-    testString: 'assert($("button").css("color") == "rgb(0, 51, 102)", "Your code should change the text <code>color</code> for the <code>button</code> to the dark blue.");'
+    testString: assert($('button').css('color') == 'rgb(0, 51, 102)', 'Your code should change the text <code>color</code> for the <code>button</code> to the dark blue.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-using-sufficient-contrast.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-using-sufficient-contrast.english.md
index b605778eaa..137a9150d1 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-using-sufficient-contrast.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/avoid-colorblindness-issues-by-using-sufficient-contrast.english.md
@@ -24,9 +24,9 @@ Camper Cat is experimenting with using color for his blog text and background, b
 ```yml
 tests:
   - text: Your code should only change the lightness value for the text <code>color</code> property to a value of 15%.
-    testString: 'assert(code.match(/color:\s*?hsl\(0,\s*?55%,\s*?15%\)/gi), "Your code should only change the lightness value for the text <code>color</code> property to a value of 15%.");'
+    testString: assert(code.match(/color:\s*?hsl\(0,\s*?55%,\s*?15%\)/gi), 'Your code should only change the lightness value for the text <code>color</code> property to a value of 15%.');
   - text: Your code should only change the lightness value for the <code>background-color</code> property to a value of 55%.
-    testString: 'assert(code.match(/background-color:\s*?hsl\(120,\s*?25%,\s*?55%\)/gi), "Your code should only change the lightness value for the <code>background-color</code> property to a value of 55%.");'
+    testString: assert(code.match(/background-color:\s*?hsl\(120,\s*?25%,\s*?55%\)/gi), 'Your code should only change the lightness value for the <code>background-color</code> property to a value of 55%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/give-links-meaning-by-using-descriptive-link-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/give-links-meaning-by-using-descriptive-link-text.english.md
index e5a3f8a07c..1296afb493 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/give-links-meaning-by-using-descriptive-link-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/give-links-meaning-by-using-descriptive-link-text.english.md
@@ -22,9 +22,9 @@ The link text that Camper Cat is using is not very descriptive without the surro
 ```yml
 tests:
   - text: Your code should move the anchor <code>a</code> tags from around the words "Click here" to wrap around the words "information about batteries".
-    testString: 'assert($("a").text().match(/^(information about batteries)$/g), "Your code should move the anchor <code>a</code> tags from around the words "Click here" to wrap around the words "information about batteries".");'
+    testString: assert($('a').text().match(/^(information about batteries)$/g), 'Your code should move the anchor <code>a</code> tags from around the words "Click here" to wrap around the words "information about batteries".');
   - text: Make sure your <code>a</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/a>/g) && code.match(/<\/a>/g).length === code.match(/<a href=(""|"")>/g).length, "Make sure your <code>a</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/a>/g) && code.match(/<\/a>/g).length === code.match(/<a href=(''|"")>/g).length, 'Make sure your <code>a</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-accessibility-of-audio-content-with-the-audio-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-accessibility-of-audio-content-with-the-audio-element.english.md
index a234e6ff5c..5479dd1ef8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-accessibility-of-audio-content-with-the-audio-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-accessibility-of-audio-content-with-the-audio-element.english.md
@@ -26,19 +26,19 @@ Time to take a break from Camper Cat and meet fellow camper Zersiax (@zersiax),
 ```yml
 tests:
   - text: Your code should have one <code>audio</code> tag.
-    testString: 'assert($("audio").length === 1, "Your code should have one <code>audio</code> tag.");'
+    testString: assert($('audio').length === 1, 'Your code should have one <code>audio</code> tag.');
   - text: Make sure your <code>audio</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/audio>/g).length === 1 && code.match(/<audio.*>[\s\S]*<\/audio>/g), "Make sure your <code>audio</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/audio>/g).length === 1 && code.match(/<audio.*>[\s\S]*<\/audio>/g), 'Make sure your <code>audio</code> element has a closing tag.');
   - text: The <code>audio</code> tag should have the <code>controls</code> attribute.
-    testString: 'assert($("audio").attr("controls"), "The <code>audio</code> tag should have the <code>controls</code> attribute.");'
+    testString: assert($('audio').attr('controls'), 'The <code>audio</code> tag should have the <code>controls</code> attribute.');
   - text: Your code should have one <code>source</code> tag.
-    testString: 'assert($("source").length === 1, "Your code should have one <code>source</code> tag.");'
+    testString: assert($('source').length === 1, 'Your code should have one <code>source</code> tag.');
   - text: Your <code>source</code> tag should be inside the <code>audio</code> tags.
-    testString: 'assert($("audio").children("source").length === 1, "Your <code>source</code> tag should be inside the <code>audio</code> tags.");'
+    testString: assert($('audio').children('source').length === 1, 'Your <code>source</code> tag should be inside the <code>audio</code> tags.');
   - text: The value for the <code>src</code> attribute on the <code>source</code> tag should match the link in the instructions exactly.
-    testString: 'assert($("source").attr("src") === "https://s3.amazonaws.com/freecodecamp/screen-reader.mp3", "The value for the <code>src</code> attribute on the <code>source</code> tag should match the link in the instructions exactly.");'
+    testString: assert($('source').attr('src') === 'https://s3.amazonaws.com/freecodecamp/screen-reader.mp3', 'The value for the <code>src</code> attribute on the <code>source</code> tag should match the link in the instructions exactly.');
   - text: Your code should include a <code>type</code> attribute on the <code>source</code> tag with a value of audio/mpeg.
-    testString: 'assert($("source").attr("type") === "audio/mpeg", "Your code should include a <code>type</code> attribute on the <code>source</code> tag with a value of audio/mpeg.");'
+    testString: assert($('source').attr('type') === 'audio/mpeg', 'Your code should include a <code>type</code> attribute on the <code>source</code> tag with a value of audio/mpeg.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-chart-accessibility-with-the-figure-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-chart-accessibility-with-the-figure-element.english.md
index 08200b9341..cc318cdec6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-chart-accessibility-with-the-figure-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-chart-accessibility-with-the-figure-element.english.md
@@ -24,17 +24,17 @@ Camper Cat is hard at work creating a stacked bar chart showing the amount of ti
 ```yml
 tests:
   - text: Your code should have one <code>figure</code> tag.
-    testString: 'assert($("figure").length == 1, "Your code should have one <code>figure</code> tag.");'
+    testString: assert($('figure').length == 1, 'Your code should have one <code>figure</code> tag.');
   - text: Your code should have one <code>figcaption</code> tag.
-    testString: 'assert($("figcaption").length == 1, "Your code should have one <code>figcaption</code> tag.");'
+    testString: assert($('figcaption').length == 1, 'Your code should have one <code>figcaption</code> tag.');
   - text: Your code should not have any <code>div</code> tags.
-    testString: 'assert($("div").length == 0, "Your code should not have any <code>div</code> tags.");'
+    testString: assert($('div').length == 0, 'Your code should not have any <code>div</code> tags.');
   - text: Your code should not have any <code>p</code> tags.
-    testString: 'assert($("p").length == 0, "Your code should not have any <code>p</code> tags.");'
+    testString: assert($('p').length == 0, 'Your code should not have any <code>p</code> tags.');
   - text: The <code>figcaption</code> should be a child of the <code>figure</code> tag.
-    testString: 'assert($("figure").children("figcaption").length == 1, "The <code>figcaption</code> should be a child of the <code>figure</code> tag.");'
+    testString: assert($('figure').children('figcaption').length == 1, 'The <code>figcaption</code> should be a child of the <code>figure</code> tag.');
   - text: Make sure your <code>figure</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/figure>/g) && code.match(/<\/figure>/g).length === code.match(/<figure>/g).length, "Make sure your <code>figure</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/figure>/g) && code.match(/<\/figure>/g).length === code.match(/<figure>/g).length, 'Make sure your <code>figure</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-form-field-accessibility-with-the-label-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-form-field-accessibility-with-the-label-element.english.md
index 747b79f382..eb26834c02 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-form-field-accessibility-with-the-label-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-form-field-accessibility-with-the-label-element.english.md
@@ -25,9 +25,9 @@ Camper Cat expects a lot of interest in his thoughtful blog posts, and wants to
 ```yml
 tests:
   - text: Your code should have a <code>for</code> attribute on the <code>label</code> tag that is not empty.
-    testString: 'assert($("label").attr("for"), "Your code should have a <code>for</code> attribute on the <code>label</code> tag that is not empty.");'
+    testString: assert($('label').attr('for'), 'Your code should have a <code>for</code> attribute on the <code>label</code> tag that is not empty.');
   - text: Your <code>for</code> attribute value should match the <code>id</code> value on the email <code>input</code>.
-    testString: 'assert($("label").attr("for") == "email", "Your <code>for</code> attribute value should match the <code>id</code> value on the email <code>input</code>.");'
+    testString: assert($('label').attr('for') == 'email', 'Your <code>for</code> attribute value should match the <code>id</code> value on the email <code>input</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-readability-with-high-contrast-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-readability-with-high-contrast-text.english.md
index 959d21a11c..d980d37df5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-readability-with-high-contrast-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/improve-readability-with-high-contrast-text.english.md
@@ -22,9 +22,9 @@ Camper Cat's choice of light gray text on a white background for his recent blog
 ```yml
 tests:
   - text: Your code should change the text <code>color</code> for the <code>body</code> to the darker gray.
-    testString: 'assert($("body").css("color") == "rgb(99, 99, 99)", "Your code should change the text <code>color</code> for the <code>body</code> to the darker gray.");'
+    testString: assert($('body').css('color') == 'rgb(99, 99, 99)', 'Your code should change the text <code>color</code> for the <code>body</code> to the darker gray.');
   - text: Your code should not change the <code>background-color</code> for the <code>body</code>.
-    testString: 'assert($("body").css("background-color") == "rgb(255, 255, 255)", "Your code should not change the <code>background-color</code> for the <code>body</code>.");'
+    testString: assert($('body').css('background-color') == 'rgb(255, 255, 255)', 'Your code should not change the <code>background-color</code> for the <code>body</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/jump-straight-to-the-content-using-the-main-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/jump-straight-to-the-content-using-the-main-element.english.md
index 5251438082..07591d8c87 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/jump-straight-to-the-content-using-the-main-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/jump-straight-to-the-content-using-the-main-element.english.md
@@ -24,9 +24,9 @@ Camper Cat has some big ideas for his ninja weapons page. Help him set up his ma
 ```yml
 tests:
   - text: Your code should have one <code>main</code> tag.
-    testString: 'assert($("main").length == 1, "Your code should have one <code>main</code> tag.");'
+    testString: assert($('main').length == 1, 'Your code should have one <code>main</code> tag.');
   - text: The <code>main</code> tags should be between the closing <code>header</code> tag and the opening <code>footer</code> tag.
-    testString: 'assert(code.match(/<\/header>\s*?<main>\s*?<\/main>/gi), "The <code>main</code> tags should be between the closing <code>header</code> tag and the opening <code>footer</code> tag.");'
+    testString: assert(code.match(/<\/header>\s*?<main>\s*?<\/main>/gi), 'The <code>main</code> tags should be between the closing <code>header</code> tag and the opening <code>footer</code> tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/know-when-alt-text-should-be-left-blank.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/know-when-alt-text-should-be-left-blank.english.md
index 173de4642d..f1b52a8d34 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/know-when-alt-text-should-be-left-blank.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/know-when-alt-text-should-be-left-blank.english.md
@@ -25,9 +25,9 @@ Camper Cat has coded a skeleton page for the blog part of his website. He's plan
 ```yml
 tests:
   - text: Your <code>img</code> tag should have an <code>alt</code> attribute.
-    testString: 'assert(!($("img").attr("alt") == undefined), "Your <code>img</code> tag should have an <code>alt</code> attribute.");'
+    testString: assert(!($('img').attr('alt') == undefined), 'Your <code>img</code> tag should have an <code>alt</code> attribute.');
   - text: The <code>alt</code> attribute should be set to an empty string.
-    testString: 'assert($("img").attr("alt") == "", "The <code>alt</code> attribute should be set to an empty string.");'
+    testString: assert($('img').attr('alt') == '', 'The <code>alt</code> attribute should be set to an empty string.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-elements-only-visible-to-a-screen-reader-by-using-custom-css.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-elements-only-visible-to-a-screen-reader-by-using-custom-css.english.md
index 8f67b0c4c7..624a188e02 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-elements-only-visible-to-a-screen-reader-by-using-custom-css.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-elements-only-visible-to-a-screen-reader-by-using-custom-css.english.md
@@ -29,13 +29,13 @@ Camper Cat created a really cool stacked bar chart for his training page, and pu
 ```yml
 tests:
   - text: Your code should set the <code>position</code> property of the <code>sr-only</code> class to a value of absolute.
-    testString: 'assert($(".sr-only").css("position") == "absolute", "Your code should set the <code>position</code> property of the <code>sr-only</code> class to a value of absolute.");'
+    testString: assert($('.sr-only').css('position') == 'absolute', 'Your code should set the <code>position</code> property of the <code>sr-only</code> class to a value of absolute.');
   - text: Your code should set the <code>left</code> property of the <code>sr-only</code> class to a value of -10000px.
-    testString: 'assert($(".sr-only").css("left") == "-10000px", "Your code should set the <code>left</code> property of the <code>sr-only</code> class to a value of -10000px.");'
+    testString: assert($('.sr-only').css('left') == '-10000px', 'Your code should set the <code>left</code> property of the <code>sr-only</code> class to a value of -10000px.');
   - text: Your code should set the <code>width</code> property of the <code>sr-only</code> class to a value of 1 pixel.
-    testString: 'assert(code.match(/width:\s*?1px/gi), "Your code should set the <code>width</code> property of the <code>sr-only</code> class to a value of 1 pixel.");'
+    testString: assert(code.match(/width:\s*?1px/gi), 'Your code should set the <code>width</code> property of the <code>sr-only</code> class to a value of 1 pixel.');
   - text: Your code should set the <code>height</code> property of the <code>sr-only</code> class to a value of 1 pixel.
-    testString: 'assert(code.match(/height:\s*?1px/gi), "Your code should set the <code>height</code> property of the <code>sr-only</code> class to a value of 1 pixel.");'
+    testString: assert(code.match(/height:\s*?1px/gi), 'Your code should set the <code>height</code> property of the <code>sr-only</code> class to a value of 1 pixel.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-links-navigatable-with-html-access-keys.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-links-navigatable-with-html-access-keys.english.md
index 120cda2cea..6dbf310a28 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-links-navigatable-with-html-access-keys.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-links-navigatable-with-html-access-keys.english.md
@@ -24,13 +24,13 @@ Camper Cat wants the links around the two blog article titles to have keyboard s
 ```yml
 tests:
   - text: Your code should add an <code>accesskey</code> attribute to the <code>a</code> tag with the <code>id</code> of "first".
-    testString: 'assert($("#first").attr("accesskey"), "Your code should add an <code>accesskey</code> attribute to the <code>a</code> tag with the <code>id</code> of "first".");'
+    testString: assert($('#first').attr('accesskey'), 'Your code should add an <code>accesskey</code> attribute to the <code>a</code> tag with the <code>id</code> of "first".');
   - text: Your code should add an <code>accesskey</code> attribute to the <code>a</code> tag with the <code>id</code> of "second".
-    testString: 'assert($("#second").attr("accesskey"), "Your code should add an <code>accesskey</code> attribute to the <code>a</code> tag with the <code>id</code> of "second".");'
+    testString: assert($('#second').attr('accesskey'), 'Your code should add an <code>accesskey</code> attribute to the <code>a</code> tag with the <code>id</code> of "second".');
   - text: Your code should set the <code>accesskey</code> attribute on the <code>a</code> tag with the <code>id</code> of "first" to "g". Note that case matters.
-    testString: 'assert($("#first").attr("accesskey") == "g", "Your code should set the <code>accesskey</code> attribute on the <code>a</code> tag with the <code>id</code> of "first" to "g". Note that case matters.");'
+    testString: assert($('#first').attr('accesskey') == 'g', 'Your code should set the <code>accesskey</code> attribute on the <code>a</code> tag with the <code>id</code> of "first" to "g". Note that case matters.');
   - text: Your code should set the <code>accesskey</code> attribute on the <code>a</code> tag with the <code>id</code> of "second" to "c". Note that case matters.
-    testString: 'assert($("#second").attr("accesskey") == "c", "Your code should set the <code>accesskey</code> attribute on the <code>a</code> tag with the <code>id</code> of "second" to "c". Note that case matters.");'
+    testString: assert($('#second').attr('accesskey') == 'c', 'Your code should set the <code>accesskey</code> attribute on the <code>a</code> tag with the <code>id</code> of "second" to "c". Note that case matters.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-footer-landmark.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-footer-landmark.english.md
index 48cdc6d434..fd4548762d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-footer-landmark.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-footer-landmark.english.md
@@ -21,11 +21,11 @@ Camper Cat's training page is making good progress. Change the <code>div</code>
 ```yml
 tests:
   - text: Your code should have one <code>footer</code> tag.
-    testString: 'assert($("footer").length == 1, "Your code should have one <code>footer</code> tag.");'
+    testString: assert($('footer').length == 1, 'Your code should have one <code>footer</code> tag.');
   - text: Your code should not have any <code>div</code> tags.
-    testString: 'assert($("div").length == 0, "Your code should not have any <code>div</code> tags.");'
+    testString: assert($('div').length == 0, 'Your code should not have any <code>div</code> tags.');
   - text: Your code should have an opening and closing <code>footer</code> tag.
-    testString: 'assert(code.match(/<footer>\s*&copy; 2018 Camper Cat\s*<\/footer>/g), "Your code should have an opening and closing <code>footer</code> tag.");'
+    testString: assert(code.match(/<footer>\s*&copy; 2018 Camper Cat\s*<\/footer>/g), 'Your code should have an opening and closing <code>footer</code> tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-header-landmark.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-header-landmark.english.md
index 5f4f639a26..6b1f1e565b 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-header-landmark.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-header-landmark.english.md
@@ -23,13 +23,13 @@ Camper Cat is writing some great articles about ninja training, and wants to add
 ```yml
 tests:
   - text: Your code should have one <code>header</code> tag.
-    testString: 'assert($("header").length == 1, "Your code should have one <code>header</code> tag.");'
+    testString: assert($('header').length == 1, 'Your code should have one <code>header</code> tag.');
   - text: Your <code>header</code> tags should wrap around the <code>h1</code>.
-    testString: 'assert($("header").children("h1").length == 1, "Your <code>header</code> tags should wrap around the <code>h1</code>.");'
+    testString: assert($('header').children('h1').length == 1, 'Your <code>header</code> tags should wrap around the <code>h1</code>.');
   - text: Your code should not have any <code>div</code> tags.
-    testString: 'assert($("div").length == 0, "Your code should not have any <code>div</code> tags.");'
+    testString: assert($('div').length == 0, 'Your code should not have any <code>div</code> tags.');
   - text: Make sure your <code>header</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/header>/g) && code.match(/<\/header>/g).length === code.match(/<header>/g).length, "Make sure your <code>header</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/header>/g) && code.match(/<\/header>/g).length === code.match(/<header>/g).length, 'Make sure your <code>header</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-nav-landmark.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-nav-landmark.english.md
index 4d368fd454..281b3a6363 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-nav-landmark.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/make-screen-reader-navigation-easier-with-the-nav-landmark.english.md
@@ -22,13 +22,13 @@ Camper Cat included navigation links at the top of his training page, but wrappe
 ```yml
 tests:
   - text: Your code should have one <code>nav</code> tag.
-    testString: 'assert($("nav").length == 1, "Your code should have one <code>nav</code> tag.");'
+    testString: assert($('nav').length == 1, 'Your code should have one <code>nav</code> tag.');
   - text: Your <code>nav</code> tags should wrap around the <code>ul</code> and its list items.
-    testString: 'assert($("nav").children("ul").length == 1, "Your <code>nav</code> tags should wrap around the <code>ul</code> and its list items.");'
+    testString: assert($('nav').children('ul').length == 1, 'Your <code>nav</code> tags should wrap around the <code>ul</code> and its list items.');
   - text: Your code should not have any <code>div</code> tags.
-    testString: 'assert($("div").length == 0, "Your code should not have any <code>div</code> tags.");'
+    testString: assert($('div').length == 0, 'Your code should not have any <code>div</code> tags.');
   - text: Make sure your <code>nav</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/nav>/g) && code.match(/<\/nav>/g).length === code.match(/<nav>/g).length, "Make sure your <code>nav</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/nav>/g) && code.match(/<\/nav>/g).length === code.match(/<nav>/g).length, 'Make sure your <code>nav</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/standardize-times-with-the-html5-datetime-attribute.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/standardize-times-with-the-html5-datetime-attribute.english.md
index 5edbc98b46..13bd9c7560 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/standardize-times-with-the-html5-datetime-attribute.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/standardize-times-with-the-html5-datetime-attribute.english.md
@@ -22,14 +22,14 @@ Camper Cat's Mortal Kombat survey results are in! Wrap a <code>time</code> tag a
 
 ```yml
 tests:
-  - text: 'Your <code>time</code> tags should wrap around the text "Thursday, September 15&lt;sup&gt;th&lt;/sup&gt;".'
-    testString: 'assert($("time").text().match(/Thursday, September 15th/g), "Your <code>time</code> tags should wrap around the text "Thursday, September 15&lt;sup&gt;th&lt;/sup&gt;".");'
+  - text: Your <code>time</code> tags should wrap around the text "Thursday, September 15&lt;sup&gt;th&lt;/sup&gt;".
+    testString: assert($('time').text().match(/Thursday, September 15th/g), 'Your <code>time</code> tags should wrap around the text "Thursday, September 15&lt;sup&gt;th&lt;/sup&gt;".');
   - text: Your <code>time</code> tag should have a <code>datetime</code> attribute that is not empty.
-    testString: 'assert($("time").attr("datetime"), "Your <code>time</code> tag should have a <code>datetime</code> attribute that is not empty.");'
+    testString: assert($('time').attr('datetime'), 'Your <code>time</code> tag should have a <code>datetime</code> attribute that is not empty.');
   - text: Your <code>datetime</code> attribute should be set to a value of 2016-09-15.
-    testString: 'assert($("time").attr("datetime") === "2016-09-15", "Your <code>datetime</code> attribute should be set to a value of 2016-09-15.");'
+    testString: assert($('time').attr('datetime') === "2016-09-15", 'Your <code>datetime</code> attribute should be set to a value of 2016-09-15.');
   - text: Make sure your <code>time</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/time>/g) && code.match(/<\/time>/g).length === 4, "Make sure your <code>time</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/time>/g) && code.match(/<\/time>/g).length === 4, 'Make sure your <code>time</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-headings-to-show-hierarchical-relationships-of-content.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-headings-to-show-hierarchical-relationships-of-content.english.md
index 99147c9baf..992e882bd5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-headings-to-show-hierarchical-relationships-of-content.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-headings-to-show-hierarchical-relationships-of-content.english.md
@@ -26,9 +26,9 @@ Camper Cat wants a page on his site dedicated to becoming a ninja. Help him fix
 ```yml
 tests:
   - text: Your code should have six <code>h3</code> tags.
-    testString: 'assert($("h3").length === 6, "Your code should have six <code>h3</code> tags.");'
+    testString: assert($('h3').length === 6, 'Your code should have six <code>h3</code> tags.');
   - text: Your code should not have any <code>h5</code> tags.
-    testString: 'assert($("h5").length === 0, "Your code should not have any <code>h5</code> tags.");'
+    testString: assert($('h5').length === 0, 'Your code should not have any <code>h5</code> tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-add-keyboard-focus-to-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-add-keyboard-focus-to-an-element.english.md
index 32260b45ee..e896c69421 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-add-keyboard-focus-to-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-add-keyboard-focus-to-an-element.english.md
@@ -24,9 +24,9 @@ Camper Cat created a new survey to collect information about his users. He knows
 ```yml
 tests:
   - text: Your code should add a <code>tabindex</code> attribute to the <code>p</code> tag that holds the form instructions.
-    testString: 'assert($("p").attr("tabindex"), "Your code should add a <code>tabindex</code> attribute to the <code>p</code> tag that holds the form instructions.");'
+    testString: assert($('p').attr('tabindex'), 'Your code should add a <code>tabindex</code> attribute to the <code>p</code> tag that holds the form instructions.');
   - text: Your code should set the <code>tabindex</code> attribute on the <code>p</code> tag to a value of 0.
-    testString: 'assert($("p").attr("tabindex") == "0", "Your code should set the <code>tabindex</code> attribute on the <code>p</code> tag to a value of 0.");'
+    testString: assert($('p').attr('tabindex') == '0', 'Your code should set the <code>tabindex</code> attribute on the <code>p</code> tag to a value of 0.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-specify-the-order-of-keyboard-focus-for-several-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-specify-the-order-of-keyboard-focus-for-several-elements.english.md
index 624cc97143..9b58e8de39 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-specify-the-order-of-keyboard-focus-for-several-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/use-tabindex-to-specify-the-order-of-keyboard-focus-for-several-elements.english.md
@@ -26,13 +26,13 @@ Camper Cat has a search field on his Inspirational Quotes page that he plans to
 ```yml
 tests:
   - text: Your code should add a <code>tabindex</code> attribute to the search <code>input</code> tag.
-    testString: 'assert($("#search").attr("tabindex"), "Your code should add a <code>tabindex</code> attribute to the search <code>input</code> tag.");'
+    testString: assert($('#search').attr('tabindex'), 'Your code should add a <code>tabindex</code> attribute to the search <code>input</code> tag.');
   - text: Your code should add a <code>tabindex</code> attribute to the submit <code>input</code> tag.
-    testString: 'assert($("#submit").attr("tabindex"), "Your code should add a <code>tabindex</code> attribute to the submit <code>input</code> tag.");'
+    testString: assert($('#submit').attr('tabindex'), 'Your code should add a <code>tabindex</code> attribute to the submit <code>input</code> tag.');
   - text: Your code should set the <code>tabindex</code> attribute on the search <code>input</code> tag to a value of 1.
-    testString: 'assert($("#search").attr("tabindex") == "1", "Your code should set the <code>tabindex</code> attribute on the search <code>input</code> tag to a value of 1.");'
+    testString: assert($('#search').attr('tabindex') == '1', 'Your code should set the <code>tabindex</code> attribute on the search <code>input</code> tag to a value of 1.');
   - text: Your code should set the <code>tabindex</code> attribute on the submit <code>input</code> tag to a value of 2.
-    testString: 'assert($("#submit").attr("tabindex") == "2", "Your code should set the <code>tabindex</code> attribute on the submit <code>input</code> tag to a value of 2.");'
+    testString: assert($('#submit').attr('tabindex') == '2', 'Your code should set the <code>tabindex</code> attribute on the submit <code>input</code> tag to a value of 2.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-content-in-the-article-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-content-in-the-article-element.english.md
index 32fee087c3..8fe5c29610 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-content-in-the-article-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-content-in-the-article-element.english.md
@@ -25,9 +25,9 @@ Camper Cat used <code>article</code> tags to wrap the posts on his blog page, bu
 ```yml
 tests:
   - text: Your code should have three <code>article</code> tags.
-    testString: 'assert($("article").length == 3, "Your code should have three <code>article</code> tags.");'
+    testString: assert($('article').length == 3, 'Your code should have three <code>article</code> tags.');
   - text: Your code should not have any <code>div</code> tags.
-    testString: 'assert($("div").length == 0, "Your code should not have any <code>div</code> tags.");'
+    testString: assert($('div').length == 0, 'Your code should not have any <code>div</code> tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-radio-buttons-in-a-fieldset-element-for-better-accessibility.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-radio-buttons-in-a-fieldset-element-for-better-accessibility.english.md
index 1d47083bdc..1f89ecfd19 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-radio-buttons-in-a-fieldset-element-for-better-accessibility.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-accessibility/wrap-radio-buttons-in-a-fieldset-element-for-better-accessibility.english.md
@@ -25,15 +25,15 @@ Camper Cat wants information about the ninja level of his users when they sign u
 ```yml
 tests:
   - text: Your code should have a <code>fieldset</code> tag around the radio button set.
-    testString: 'assert($("fieldset").length == 1, "Your code should have a <code>fieldset</code> tag around the radio button set.");'
+    testString: assert($('fieldset').length == 1, 'Your code should have a <code>fieldset</code> tag around the radio button set.');
   - text: Make sure your <code>fieldset</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/fieldset>/g) && code.match(/<\/fieldset>/g).length === code.match(/<fieldset>/g).length, "Make sure your <code>fieldset</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/fieldset>/g) && code.match(/<\/fieldset>/g).length === code.match(/<fieldset>/g).length, 'Make sure your <code>fieldset</code> element has a closing tag.');
   - text: Your code should have a <code>legend</code> tag around the text asking what level ninja a user is.
-    testString: 'assert($("legend").length == 1, "Your code should have a <code>legend</code> tag around the text asking what level ninja a user is.");'
+    testString: assert($('legend').length == 1, 'Your code should have a <code>legend</code> tag around the text asking what level ninja a user is.');
   - text: Your code should not have any <code>div</code> tags.
-    testString: 'assert($("div").length == 0, "Your code should not have any <code>div</code> tags.");'
+    testString: assert($('div').length == 0, 'Your code should not have any <code>div</code> tags.');
   - text: Your code should no longer have a <code>p</code> tag around the text asking what level ninja a user is.
-    testString: 'assert($("p").length == 4, "Your code should no longer have a <code>p</code> tag around the text asking what level ninja a user is.");'
+    testString: assert($('p').length == 4, 'Your code should no longer have a <code>p</code> tag around the text asking what level ninja a user is.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/add-a-box-shadow-to-a-card-like-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/add-a-box-shadow-to-a-card-like-element.english.md
index 34ed8a57c6..a2cedc25df 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/add-a-box-shadow-to-a-card-like-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/add-a-box-shadow-to-a-card-like-element.english.md
@@ -24,9 +24,9 @@ The element now has an id of <code>thumbnail</code>. With this selector, use the
 ```yml
 tests:
   - text: Your code should add a <code>box-shadow</code> property for the <code>thumbnail</code> id.
-    testString: 'assert(code.match(/#thumbnail\s*?{\s*?box-shadow/g), "Your code should add a <code>box-shadow</code> property for the <code>thumbnail</code> id.");'
+    testString: assert(code.match(/#thumbnail\s*?{\s*?box-shadow/g), 'Your code should add a <code>box-shadow</code> property for the <code>thumbnail</code> id.');
   - text: You should use the given CSS for the <code>box-shadow</code> value.
-    testString: 'assert(code.match(/box-shadow:\s*?0\s+?10px\s+?20px\s+?rgba\(\s*?0\s*?,\s*?0\s*?,\s*?0\s*?,\s*?0?\.19\),\s*?0\s+?6px\s+?6px\s+?rgba\(\s*?0\s*?,\s*?0\s*?,\s*?0\s*?,\s*?0?\.23\)/gi), "You should use the given CSS for the <code>box-shadow</code> value.");'
+    testString: assert(code.match(/box-shadow:\s*?0\s+?10px\s+?20px\s+?rgba\(\s*?0\s*?,\s*?0\s*?,\s*?0\s*?,\s*?0?\.19\),\s*?0\s+?6px\s+?6px\s+?rgba\(\s*?0\s*?,\s*?0\s*?,\s*?0\s*?,\s*?0?\.23\)/gi), 'You should use the given CSS for the <code>box-shadow</code> value.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-background-color-property-of-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-background-color-property-of-text.english.md
index 2879b7cf93..873b90f9fe 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-background-color-property-of-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-background-color-property-of-text.english.md
@@ -24,12 +24,12 @@ Also for the <code>h4</code>, remove the <code>height</code> property and add <c
 
 ```yml
 tests:
-  - text: 'Your code should add a <code>background-color</code> property to the <code>h4</code> element set to <code>rgba(45, 45, 45, 0.1)</code>.'
-    testString: 'assert(code.match(/background-color:\s*?rgba\(\s*?45\s*?,\s*?45\s*?,\s*?45\s*?,\s*?0?\.1\s*?\)/gi), "Your code should add a <code>background-color</code> property to the <code>h4</code> element set to <code>rgba(45, 45, 45, 0.1)</code>.");'
+  - text: Your code should add a <code>background-color</code> property to the <code>h4</code> element set to <code>rgba(45, 45, 45, 0.1)</code>.
+    testString: assert(code.match(/background-color:\s*?rgba\(\s*?45\s*?,\s*?45\s*?,\s*?45\s*?,\s*?0?\.1\s*?\)/gi), 'Your code should add a <code>background-color</code> property to the <code>h4</code> element set to <code>rgba(45, 45, 45, 0.1)</code>.');
   - text: Your code should add a <code>padding</code> property to the <code>h4</code> element and set it to 10 pixels.
-    testString: 'assert($("h4").css("padding-top") == "10px" && $("h4").css("padding-right") == "10px" && $("h4").css("padding-bottom") == "10px" && $("h4").css("padding-left") == "10px", "Your code should add a <code>padding</code> property to the <code>h4</code> element and set it to 10 pixels.");'
+    testString: assert($('h4').css('padding-top') == '10px' && $('h4').css('padding-right') == '10px' && $('h4').css('padding-bottom') == '10px' && $('h4').css('padding-left') == '10px', 'Your code should add a <code>padding</code> property to the <code>h4</code> element and set it to 10 pixels.');
   - text: The <code>height</code> property on the <code>h4</code> element should be removed.
-    testString: 'assert(!($("h4").css("height") == "25px"), "The <code>height</code> property on the <code>h4</code> element should be removed.");'
+    testString: assert(!($('h4').css('height') == '25px'), 'The <code>height</code> property on the <code>h4</code> element should be removed.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-color-of-various-elements-to-complementary-colors.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-color-of-various-elements-to-complementary-colors.english.md
index e7f581c378..421dbd4e0e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-color-of-various-elements-to-complementary-colors.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-color-of-various-elements-to-complementary-colors.english.md
@@ -21,13 +21,13 @@ This page will use a shade of teal (<code>#09A7A1</code>) as the dominant color,
 ```yml
 tests:
   - text: 'The <code>header</code> element should have a <code>background-color</code> of #09A7A1.'
-    testString: 'assert($("header").css("background-color") == "rgb(9, 167, 161)", "The <code>header</code> element should have a <code>background-color</code> of #09A7A1.");'
+    testString: "assert($('header').css('background-color') == 'rgb(9, 167, 161)', 'The <code>header</code> element should have a <code>background-color</code> of #09A7A1.');"
   - text: 'The <code>footer</code> element should have a <code>background-color</code> of #09A7A1.'
-    testString: 'assert($("footer").css("background-color") == "rgb(9, 167, 161)", "The <code>footer</code> element should have a <code>background-color</code> of #09A7A1.");'
+    testString: "assert($('footer').css('background-color') == 'rgb(9, 167, 161)', 'The <code>footer</code> element should have a <code>background-color</code> of #09A7A1.');"
   - text: 'The <code>h2</code> element should have a <code>color</code> of #09A7A1.'
-    testString: 'assert($("h2").css("color") == "rgb(9, 167, 161)", "The <code>h2</code> element should have a <code>color</code> of #09A7A1.");'
+    testString: "assert($('h2').css('color') == 'rgb(9, 167, 161)', 'The <code>h2</code> element should have a <code>color</code> of #09A7A1.');"
   - text: 'The <code>button</code> element should have a <code>background-color</code> of #FF790E.'
-    testString: 'assert($("button").css("background-color") == "rgb(255, 121, 14)", "The <code>button</code> element should have a <code>background-color</code> of #FF790E.");'
+    testString: "assert($('button').css('background-color') == 'rgb(255, 121, 14)', 'The <code>button</code> element should have a <code>background-color</code> of #FF790E.');"
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-height-of-an-element-using-the-height-property.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-height-of-an-element-using-the-height-property.english.md
index 40e9683ad1..ec1d4230ac 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-height-of-an-element-using-the-height-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-height-of-an-element-using-the-height-property.english.md
@@ -22,7 +22,7 @@ Add a <code>height</code> property to the <code>h4</code> tag and set it to 25px
 ```yml
 tests:
   - text: Your code should change the <code>h4</code> <code>height</code> property to a value of 25 pixels.
-    testString: 'assert($("h4").css("height") == "25px", "Your code should change the <code>h4</code> <code>height</code> property to a value of 25 pixels.");'
+    testString: assert($('h4').css('height') == '25px', 'Your code should change the <code>h4</code> <code>height</code> property to a value of 25 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md
index 0710931272..180023a274 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hover-state-of-an-anchor-tag.english.md
@@ -22,10 +22,10 @@ The code editor has a CSS rule to style all <code>a</code> tags black. Add a rul
 
 ```yml
 tests:
-  - text: 'The anchor tag <code>color</code> should remain black, only add CSS rules for the <code>:hover</code> state.'
-    testString: 'assert($("a").css("color") == "rgb(0, 0, 0)", "The anchor tag <code>color</code> should remain black, only add CSS rules for the <code>:hover</code> state.");'
+  - text: The anchor tag <code>color</code> should remain black, only add CSS rules for the <code>:hover</code> state.
+    testString: assert($('a').css('color') == 'rgb(0, 0, 0)', 'The anchor tag <code>color</code> should remain black, only add CSS rules for the <code>:hover</code> state.');
   - text: The anchor tag should have a <code>color</code> of blue on hover.
-    testString: 'assert(code.match(/a:hover\s*?{\s*?color:\s*?blue;\s*?}/gi), "The anchor tag should have a <code>color</code> of blue on hover.");'
+    testString: assert(code.match(/a:hover\s*?{\s*?color:\s*?blue;\s*?}/gi), 'The anchor tag should have a <code>color</code> of blue on hover.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hue-of-a-color.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hue-of-a-color.english.md
index eb57352b33..092b7f38e4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hue-of-a-color.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-hue-of-a-color.english.md
@@ -26,17 +26,17 @@ Change the <code>background-color</code> of each <code>div</code> element based
 ```yml
 tests:
   - text: Your code should use the <code>hsl()</code> property to declare the color green.
-    testString: 'assert(code.match(/\.green\s*?{\s*?background-color:\s*?hsl/gi), "Your code should use the <code>hsl()</code> property to declare the color green.");'
+    testString: assert(code.match(/\.green\s*?{\s*?background-color:\s*?hsl/gi), 'Your code should use the <code>hsl()</code> property to declare the color green.');
   - text: Your code should use the <code>hsl()</code> property to declare the color cyan.
-    testString: 'assert(code.match(/\.cyan\s*?{\s*?background-color:\s*?hsl/gi), "Your code should use the <code>hsl()</code> property to declare the color cyan.");'
+    testString: assert(code.match(/\.cyan\s*?{\s*?background-color:\s*?hsl/gi), 'Your code should use the <code>hsl()</code> property to declare the color cyan.');
   - text: Your code should use the <code>hsl()</code> property to declare the color blue.
-    testString: 'assert(code.match(/\.blue\s*?{\s*?background-color:\s*?hsl/gi), "Your code should use the <code>hsl()</code> property to declare the color blue.");'
+    testString: assert(code.match(/\.blue\s*?{\s*?background-color:\s*?hsl/gi), 'Your code should use the <code>hsl()</code> property to declare the color blue.');
   - text: The <code>div</code> element with class <code>green</code> should have a <code>background-color</code> of green.
-    testString: 'assert($(".green").css("background-color") == "rgb(0, 255, 0)", "The <code>div</code> element with class <code>green</code> should have a <code>background-color</code> of green.");'
+    testString: assert($('.green').css('background-color') == 'rgb(0, 255, 0)', 'The <code>div</code> element with class <code>green</code> should have a <code>background-color</code> of green.');
   - text: The <code>div</code> element with class <code>cyan</code> should have a <code>background-color</code> of cyan.
-    testString: 'assert($(".cyan").css("background-color") == "rgb(0, 255, 255)", "The <code>div</code> element with class <code>cyan</code> should have a <code>background-color</code> of cyan.");'
+    testString: assert($('.cyan').css('background-color') == 'rgb(0, 255, 255)', 'The <code>div</code> element with class <code>cyan</code> should have a <code>background-color</code> of cyan.');
   - text: The <code>div</code> element with class <code>blue</code> should have a <code>background-color</code> of blue.
-    testString: 'assert($(".blue").css("background-color") == "rgb(0, 0, 255)", "The <code>div</code> element with class <code>blue</code> should have a <code>background-color</code> of blue.");'
+    testString: assert($('.blue').css('background-color') == 'rgb(0, 0, 255)', 'The <code>div</code> element with class <code>blue</code> should have a <code>background-color</code> of blue.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-size-of-a-header-versus-a-paragraph-tag.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-size-of-a-header-versus-a-paragraph-tag.english.md
index 7f05f8d3bb..60eb008e3b 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-size-of-a-header-versus-a-paragraph-tag.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-size-of-a-header-versus-a-paragraph-tag.english.md
@@ -21,7 +21,7 @@ To make the heading significantly larger than the paragraph, change the <code>fo
 ```yml
 tests:
   - text: Your code should add a <code>font-size</code> property to the <code>h4</code> element set to 27 pixels.
-    testString: 'assert($("h4").css("font-size") == "27px", "Your code should add a <code>font-size</code> property to the <code>h4</code> element set to 27 pixels.");'
+    testString: assert($('h4').css('font-size') == '27px', 'Your code should add a <code>font-size</code> property to the <code>h4</code> element set to 27 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-tone-of-a-color.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-tone-of-a-color.english.md
index 0cd6c0a3a8..fcdd63fc42 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-tone-of-a-color.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-tone-of-a-color.english.md
@@ -21,7 +21,7 @@ All elements have a default <code>background-color</code> of <code>transparent</
 ```yml
 tests:
   - text: The <code>nav</code> element should have a <code>background-color</code> of the adjusted cyan tone using the <code>hsl()</code> property.
-    testString: 'assert(code.match(/nav\s*?{\s*?background-color:\s*?hsl\(180,\s*?80%,\s*?25%\)/gi), "The <code>nav</code> element should have a <code>background-color</code> of the adjusted cyan tone using the <code>hsl()</code> property.");'
+    testString: assert(code.match(/nav\s*?{\s*?background-color:\s*?hsl\(180,\s*?80%,\s*?25%\)/gi), 'The <code>nav</code> element should have a <code>background-color</code> of the adjusted cyan tone using the <code>hsl()</code> property.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-width-of-an-element-using-the-width-property.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-width-of-an-element-using-the-width-property.english.md
index dcf6c30652..bc769f110a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-width-of-an-element-using-the-width-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/adjust-the-width-of-an-element-using-the-width-property.english.md
@@ -22,7 +22,7 @@ Add a <code>width</code> property to the entire card and set it to an absolute v
 ```yml
 tests:
   - text: Your code should change the <code>width</code> property of the card to 245 pixels by using the <code>fullCard</code> class selector.
-    testString: 'assert(code.match(/.fullCard\s*{[\s\S][^}]*\n*^\s*width\s*:\s*245px\s*;/gm), "Your code should change the <code>width</code> property of the card to 245 pixels by using the <code>fullCard</code> class selector.");'
+    testString: assert(code.match(/.fullCard\s*{[\s\S][^}]*\n*^\s*width\s*:\s*245px\s*;/gm), 'Your code should change the <code>width</code> property of the card to 245 pixels by using the <code>fullCard</code> class selector.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-at-variable-rates.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-at-variable-rates.english.md
index 08a0227bf1..9ae999ba3e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-at-variable-rates.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-at-variable-rates.english.md
@@ -22,7 +22,7 @@ Alter the animation rate for the element with the class name of <code>star-1</co
 ```yml
 tests:
   - text: The <code>@keyframes</code> rule for the <code>star-1</code> class should be 50%.
-    testString: 'assert(code.match(/twinkle-1\s*?{\s*?50%/g), "The <code>@keyframes</code> rule for the <code>star-1</code> class should be 50%.");'
+    testString: assert(code.match(/twinkle-1\s*?{\s*?50%/g), 'The <code>@keyframes</code> rule for the <code>star-1</code> class should be 50%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-continually-using-an-infinite-animation-count.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-continually-using-an-infinite-animation-count.english.md
index 15696b7fc2..873dd3f891 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-continually-using-an-infinite-animation-count.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-elements-continually-using-an-infinite-animation-count.english.md
@@ -23,7 +23,7 @@ To keep the ball bouncing on the right on a continuous loop, change the <code>an
 ```yml
 tests:
   - text: The <code>animation-iteration-count</code> property should have a value of infinite.
-    testString: 'assert($("#ball").css("animation-iteration-count") == "infinite", "The <code>animation-iteration-count</code> property should have a value of infinite.");'
+    testString: assert($('#ball').css('animation-iteration-count') == 'infinite', 'The <code>animation-iteration-count</code> property should have a value of infinite.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-multiple-elements-at-variable-rates.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-multiple-elements-at-variable-rates.english.md
index bb3ae7fa7f..a537eb9d37 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-multiple-elements-at-variable-rates.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/animate-multiple-elements-at-variable-rates.english.md
@@ -22,11 +22,11 @@ Set the <code>animation-duration</code> of the elements with the classes <code>s
 ```yml
 tests:
   - text: The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.
-    testString: 'assert($(".star-1").css("animation-duration") == "1s", "The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.");'
+    testString: assert($('.star-1').css('animation-duration') == '1s', 'The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.');
   - text: The <code>animation-duration</code> property for the star with class <code>star-2</code> should be 0.9s.
-    testString: 'assert($(".star-2").css("animation-duration") == "0.9s", "The <code>animation-duration</code> property for the star with class <code>star-2</code> should be 0.9s.");'
+    testString: assert($('.star-2').css('animation-duration') == '0.9s', 'The <code>animation-duration</code> property for the star with class <code>star-2</code> should be 0.9s.');
   - text: The <code>animation-duration</code> property for the star with class <code>star-3</code> should be 1.1s.
-    testString: 'assert($(".star-3").css("animation-duration") == "1.1s", "The <code>animation-duration</code> property for the star with class <code>star-3</code> should be 1.1s.");'
+    testString: assert($('.star-3').css('animation-duration') == '1.1s', 'The <code>animation-duration</code> property for the star with class <code>star-3</code> should be 1.1s.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/center-an-element-horizontally-using-the-margin-property.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/center-an-element-horizontally-using-the-margin-property.english.md
index ccb750c010..d816d97c88 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/center-an-element-horizontally-using-the-margin-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/center-an-element-horizontally-using-the-margin-property.english.md
@@ -22,7 +22,7 @@ Center the <code>div</code> on the page by adding a <code>margin</code> property
 ```yml
 tests:
   - text: The <code>div</code> should have a <code>margin</code> set to auto.
-    testString: 'assert(code.match(/margin:\s*?auto;/g), "The <code>div</code> should have a <code>margin</code> set to auto.");'
+    testString: assert(code.match(/margin:\s*?auto;/g), 'The <code>div</code> should have a <code>margin</code> set to auto.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-an-elements-relative-position.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-an-elements-relative-position.english.md
index 9e70bd13c1..618aa9a2b9 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-an-elements-relative-position.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-an-elements-relative-position.english.md
@@ -25,9 +25,9 @@ Change the <code>position</code> of the <code>h2</code> to <code>relative</code>
 ```yml
 tests:
   - text: The <code>h2</code> element should have a <code>position</code> property set to <code>relative</code>.
-    testString: 'assert($("h2").css("position") == "relative", "The <code>h2</code> element should have a <code>position</code> property set to <code>relative</code>.");'
+    testString: assert($('h2').css('position') == 'relative', 'The <code>h2</code> element should have a <code>position</code> property set to <code>relative</code>.');
   - text: Your code should use a CSS offset to relatively position the <code>h2</code> 15px away from the <code>top</code> of where it normally sits.
-    testString: 'assert($("h2").css("top") == "15px", "Your code should use a CSS offset to relatively position the <code>h2</code> 15px away from the <code>top</code> of where it normally sits.");'
+    testString: assert($('h2').css('top') == '15px', 'Your code should use a CSS offset to relatively position the <code>h2</code> 15px away from the <code>top</code> of where it normally sits.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-animation-timing-with-keywords.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-animation-timing-with-keywords.english.md
index 5c142965e4..a33b5b64ab 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-animation-timing-with-keywords.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-animation-timing-with-keywords.english.md
@@ -22,9 +22,9 @@ For the elements with id of <code>ball1</code> and <code>ball2</code>, add an <c
 ```yml
 tests:
   - text: The value of the <code>animation-timing-function</code> property for the element with the id <code>ball1</code> should be linear.
-    testString: 'assert($("#ball1").css("animation-timing-function") == "linear", "The value of the <code>animation-timing-function</code> property for the element with the id <code>ball1</code> should be linear.");'
+    testString: assert($('#ball1').css('animation-timing-function') == 'linear', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>ball1</code> should be linear.');
   - text: The value of the <code>animation-timing-function</code> property for the element with the id <code>ball2</code> should be ease-out.
-    testString: 'assert($("#ball2").css("animation-timing-function") == "ease-out", "The value of the <code>animation-timing-function</code> property for the element with the id <code>ball2</code> should be ease-out.");'
+    testString: assert($('#ball2').css('animation-timing-function') == 'ease-out', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>ball2</code> should be ease-out.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-the-position-of-overlapping-elements-with-the-z-index-property.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-the-position-of-overlapping-elements-with-the-z-index-property.english.md
index a7e0613876..6577435ad2 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-the-position-of-overlapping-elements-with-the-z-index-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-the-position-of-overlapping-elements-with-the-z-index-property.english.md
@@ -21,7 +21,7 @@ Add a <code>z-index</code> property to the element with the class name of <code>
 ```yml
 tests:
   - text: The element with class <code>first</code> should have a <code>z-index</code> value of 2.
-    testString: 'assert($(".first").css("z-index") == "2", "The element with class <code>first</code> should have a <code>z-index</code> value of 2.");'
+    testString: assert($('.first').css('z-index') == '2', 'The element with class <code>first</code> should have a <code>z-index</code> value of 2.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-gradual-css-linear-gradient.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-gradual-css-linear-gradient.english.md
index d15c701a56..3b8ade1aff 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-gradual-css-linear-gradient.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-gradual-css-linear-gradient.english.md
@@ -26,7 +26,7 @@ Use a <code>linear-gradient()</code> for the <code>div</code> element's <code>ba
 ```yml
 tests:
   - text: The <code>div</code> element should have a <code>linear-gradient</code> <code>background</code> with the specified direction and colors.
-    testString: 'assert(code.match(/background:\s*?linear-gradient\(35deg,\s*?(#CCFFFF|#CFF),\s*?(#FFCCCC|#FCC)\);/gi), "The <code>div</code> element should have a <code>linear-gradient</code> <code>background</code> with the specified direction and colors.");'
+    testString: assert(code.match(/background:\s*?linear-gradient\(35deg,\s*?(#CCFFFF|#CFF),\s*?(#FFCCCC|#FCC)\);/gi), 'The <code>div</code> element should have a <code>linear-gradient</code> <code>background</code> with the specified direction and colors.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-graphic-using-css.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-graphic-using-css.english.md
index 5254a09ad2..ca402a2fd5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-graphic-using-css.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-graphic-using-css.english.md
@@ -24,11 +24,11 @@ Manipulate the square element in the editor to create the moon shape. First, cha
 ```yml
 tests:
   - text: The value of the <code>background-color</code> property should be set to <code>transparent</code>.
-    testString: 'assert(code.match(/background-color:\s*?transparent;/gi), "The value of the <code>background-color</code> property should be set to <code>transparent</code>.");'
+    testString: assert(code.match(/background-color:\s*?transparent;/gi), 'The value of the <code>background-color</code> property should be set to <code>transparent</code>.');
   - text: The value of the <code>border-radius</code> property should be set to <code>50%</code>.
-    testString: 'assert(code.match(/border-radius:\s*?50%;/gi), "The value of the <code>border-radius</code> property should be set to <code>50%</code>.");'
-  - text: 'The value of the <code>box-shadow</code> property should be set to 25px for <code>offset-x</code>, 10px for <code>offset-y</code>, 0 for <code>blur-radius</code>, 0 for <code>spread-radius</code>, and finally blue for the color.'
-    testString: 'assert(code.match(/box-shadow:\s*?25px\s+?10px\s+?0(px)?\s+?0(px)?\s+?blue\s*?;/gi), "The value of the <code>box-shadow</code> property should be set to 25px for <code>offset-x</code>, 10px for <code>offset-y</code>, 0 for <code>blur-radius</code>, 0 for <code>spread-radius</code>, and finally blue for the color.");'
+    testString: assert(code.match(/border-radius:\s*?50%;/gi), 'The value of the <code>border-radius</code> property should be set to <code>50%</code>.');
+  - text: The value of the <code>box-shadow</code> property should be set to 25px for <code>offset-x</code>, 10px for <code>offset-y</code>, 0 for <code>blur-radius</code>, 0 for <code>spread-radius</code>, and finally blue for the color.
+    testString: assert(code.match(/box-shadow:\s*?25px\s+?10px\s+?0(px)?\s+?0(px)?\s+?blue\s*?;/gi), 'The value of the <code>box-shadow</code> property should be set to 25px for <code>offset-x</code>, 10px for <code>offset-y</code>, 0 for <code>blur-radius</code>, 0 for <code>spread-radius</code>, and finally blue for the color.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-horizontal-line-using-the-hr-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-horizontal-line-using-the-hr-element.english.md
index f8118bfa34..1780839137 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-horizontal-line-using-the-hr-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-horizontal-line-using-the-hr-element.english.md
@@ -22,9 +22,9 @@ Add an <code>hr</code> tag underneath the <code>h4</code> which contains the car
 ```yml
 tests:
   - text: Your code should add an <code>hr</code> tag to the markup.
-    testString: 'assert($("hr").length == 1, "Your code should add an <code>hr</code> tag to the markup.");'
+    testString: assert($('hr').length == 1, 'Your code should add an <code>hr</code> tag to the markup.');
   - text: The <code>hr</code> tag should come between the title and the paragraph.
-    testString: 'assert(code.match(/<\/h4>\s*?<hr(>|\s*?\/>)\s*?<p>/gi), "The <code>hr</code> tag should come between the title and the paragraph.");'
+    testString: assert(code.match(/<\/h4>\s*?<hr(>|\s*?\/>)\s*?<p>/gi), 'The <code>hr</code> tag should come between the title and the paragraph.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-more-complex-shape-using-css-and-html.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-more-complex-shape-using-css-and-html.english.md
index bba519af17..f3d66dbbc3 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-more-complex-shape-using-css-and-html.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-a-more-complex-shape-using-css-and-html.english.md
@@ -25,14 +25,14 @@ Finally, in the <code>heart::before</code> selector, set its <code>content</code
 
 ```yml
 tests:
-  - text: 'The <code>background-color</code> property of the <code>heart::after</code> selector should be pink.'
-    testString: 'assert(code.match(/\.heart::after\s*?{\s*?background-color\s*?:\s*?pink\s*?;/gi), "The <code>background-color</code> property of the <code>heart::after</code> selector should be pink.");'
-  - text: 'The <code>border-radius</code> of the <code>heart::after</code> selector should be 50%.'
-    testString: 'assert(code.match(/border-radius\s*?:\s*?50%/gi).length == 2, "The <code>border-radius</code> of the <code>heart::after</code> selector should be 50%.");'
+  - text: The <code>background-color</code> property of the <code>heart::after</code> selector should be pink.
+    testString: assert(code.match(/\.heart::after\s*?{\s*?background-color\s*?:\s*?pink\s*?;/gi), 'The <code>background-color</code> property of the <code>heart::after</code> selector should be pink.');
+  - text: The <code>border-radius</code> of the <code>heart::after</code> selector should be 50%.
+    testString: assert(code.match(/border-radius\s*?:\s*?50%/gi).length == 2, 'The <code>border-radius</code> of the <code>heart::after</code> selector should be 50%.');
   - text: The <code>transform</code> property for the <code>heart</code> class should use a <code>rotate()</code> function set to -45 degrees.
-    testString: 'assert(code.match(/transform\s*?:\s*?rotate\(\s*?-45deg\s*?\)/gi), "The <code>transform</code> property for the <code>heart</code> class should use a <code>rotate()</code> function set to -45 degrees.");'
-  - text: 'The <code>content</code> of the <code>heart::before</code> selector should be an empty string.'
-    testString: 'assert(code.match(/\.heart::before\s*?{\s*?content\s*?:\s*?("|")\1\s*?;/gi), "The <code>content</code> of the <code>heart::before</code> selector should be an empty string.");'
+    testString: assert(code.match(/transform\s*?:\s*?rotate\(\s*?-45deg\s*?\)/gi), 'The <code>transform</code> property for the <code>heart</code> class should use a <code>rotate()</code> function set to -45 degrees.');
+  - text: The <code>content</code> of the <code>heart::before</code> selector should be an empty string.
+    testString: assert(code.match(/\.heart::before\s*?{\s*?content\s*?:\s*?("|')\1\s*?;/gi), 'The <code>content</code> of the <code>heart::before</code> selector should be an empty string.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-movement-using-css-animation.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-movement-using-css-animation.english.md
index 03a8112f21..6a1369c492 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-movement-using-css-animation.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-movement-using-css-animation.english.md
@@ -23,11 +23,11 @@ Add a horizontal motion to the <code>div</code> animation. Using the <code>left<
 ```yml
 tests:
   - text: The <code>@keyframes</code> rule for <code>0%</code> should use the <code>left</code> offset of 0px.
-    testString: 'assert(code.match(/0%\s*?{\s*?background-color:\s*?blue;\s*?top:\s*?0(px)?;\s*?left:\s*?0(px)?;\s*?}/gi), "The <code>@keyframes</code> rule for <code>0%</code> should use the <code>left</code> offset of 0px.");'
+    testString: assert(code.match(/0%\s*?{\s*?background-color:\s*?blue;\s*?top:\s*?0(px)?;\s*?left:\s*?0(px)?;\s*?}/gi), 'The <code>@keyframes</code> rule for <code>0%</code> should use the <code>left</code> offset of 0px.');
   - text: The <code>@keyframes</code> rule for <code>50%</code> should use the <code>left</code> offset of 25px.
-    testString: 'assert(code.match(/50%\s*?{\s*?background-color:\s*?green;\s*?top:\s*?50px;\s*?left:\s*?25px;\s*?}/gi), "The <code>@keyframes</code> rule for <code>50%</code> should use the <code>left</code> offset of 25px.");'
+    testString: assert(code.match(/50%\s*?{\s*?background-color:\s*?green;\s*?top:\s*?50px;\s*?left:\s*?25px;\s*?}/gi), 'The <code>@keyframes</code> rule for <code>50%</code> should use the <code>left</code> offset of 25px.');
   - text: The <code>@keyframes</code> rule for <code>100%</code> should use the <code>left</code> offset of -25px.
-    testString: 'assert(code.match(/100%\s*?{\s*?background-color:\s*?yellow;\s*?top:\s*?0(px)?;\s*?left:\s*?-25px;\s*?}/gi), "The <code>@keyframes</code> rule for <code>100%</code> should use the <code>left</code> offset of -25px.");'
+    testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?yellow;\s*?top:\s*?0(px)?;\s*?left:\s*?-25px;\s*?}/gi), 'The <code>@keyframes</code> rule for <code>100%</code> should use the <code>left</code> offset of -25px.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-texture-by-adding-a-subtle-pattern-as-a-background-image.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-texture-by-adding-a-subtle-pattern-as-a-background-image.english.md
index 4fd5bd91ac..0abd377b35 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-texture-by-adding-a-subtle-pattern-as-a-background-image.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-texture-by-adding-a-subtle-pattern-as-a-background-image.english.md
@@ -21,7 +21,7 @@ Using the url of <code>https://i.imgur.com/MJAkxbh.png</code>, set the <code>bac
 ```yml
 tests:
   - text: Your <code>body</code> element should have a <code>background</code> property set to a <code>url()</code> with the given link.
-    testString: 'assert(code.match(/background:\s*?url\(\s*("|"|)https:\/\/i\.imgur\.com\/MJAkxbh\.png\1\s*\)/gi), "Your <code>body</code> element should have a <code>background</code> property set to a <code>url()</code> with the given link.");'
+    testString: assert(code.match(/background:\s*?url\(\s*("|'|)https:\/\/i\.imgur\.com\/MJAkxbh\.png\1\s*\)/gi), 'Your <code>body</code> element should have a <code>background</code> property set to a <code>url()</code> with the given link.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-balance-using-the-text-align-property.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-balance-using-the-text-align-property.english.md
index 3c1f8ea7f4..42dd5003f3 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-balance-using-the-text-align-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-balance-using-the-text-align-property.english.md
@@ -26,9 +26,9 @@ Align the <code>h4</code> tag's text, which says "Google", to the center. Then j
 ```yml
 tests:
   - text: Your code should use the text-align property on the <code>h4</code> tag to set it to center.
-    testString: 'assert($("h4").css("text-align") == "center", "Your code should use the text-align property on the <code>h4</code> tag to set it to center.");'
+    testString: assert($('h4').css('text-align') == 'center', 'Your code should use the text-align property on the <code>h4</code> tag to set it to center.');
   - text: Your code should use the text-align property on the <code>p</code> tag to set it to justify.
-    testString: 'assert($("p").css("text-align") == "justify", "Your code should use the text-align property on the <code>p</code> tag to set it to justify.");'
+    testString: assert($('p').css('text-align') == 'justify', 'Your code should use the text-align property on the <code>p</code> tag to set it to justify.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-direction-by-fading-an-element-from-left-to-right.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-direction-by-fading-an-element-from-left-to-right.english.md
index 009654596e..bf460592b1 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-direction-by-fading-an-element-from-left-to-right.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/create-visual-direction-by-fading-an-element-from-left-to-right.english.md
@@ -22,7 +22,7 @@ Target the element with the id of <code>ball</code> and add the <code>opacity</c
 ```yml
 tests:
   - text: The <code>keyframes</code> rule for fade should set the <code>opacity</code> property to 0.1 at 50%.
-    testString: 'assert(code.match(/@keyframes fade\s*?{\s*?50%\s*?{\s*?(?:left:\s*?60%;\s*?opacity:\s*?0?\.1;|opacity:\s*?0?\.1;\s*?left:\s*?60%;)/gi), "The <code>keyframes</code> rule for fade should set the <code>opacity</code> property to 0.1 at 50%.");'
+    testString: assert(code.match(/@keyframes fade\s*?{\s*?50%\s*?{\s*?(?:left:\s*?60%;\s*?opacity:\s*?0?\.1;|opacity:\s*?0?\.1;\s*?left:\s*?60%;)/gi), 'The <code>keyframes</code> rule for fade should set the <code>opacity</code> property to 0.1 at 50%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/decrease-the-opacity-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/decrease-the-opacity-of-an-element.english.md
index e60f68baaa..098637e072 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/decrease-the-opacity-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/decrease-the-opacity-of-an-element.english.md
@@ -23,7 +23,7 @@ Set the <code>opacity</code> of the anchor tags to 0.7 using <code>links</code>
 ```yml
 tests:
   - text: Your code should set the <code>opacity</code> property to 0.7 on the anchor tags by selecting the class of <code>links</code>.
-    testString: 'assert.approximately(parseFloat($(".links").css("opacity")), 0.7, 0.1, "Your code should set the <code>opacity</code> property to 0.7 on the anchor tags by selecting the class of <code>links</code>.");'
+    testString: assert.approximately(parseFloat($('.links').css('opacity')), 0.7, 0.1, 'Your code should set the <code>opacity</code> property to 0.7 on the anchor tags by selecting the class of <code>links</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-complementary-colors.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-complementary-colors.english.md
index 3db21288c9..55c4072434 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-complementary-colors.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-complementary-colors.english.md
@@ -27,9 +27,9 @@ Change the <code>background-color</code> property of the <code>blue</code> and <
 ```yml
 tests:
   - text: The <code>div</code> element with class <code>blue</code> should have a <code>background-color</code> of blue.
-    testString: 'assert($(".blue").css("background-color") == "rgb(0, 0, 255)", "The <code>div</code> element with class <code>blue</code> should have a <code>background-color</code> of blue.");'
+    testString: assert($('.blue').css('background-color') == 'rgb(0, 0, 255)', 'The <code>div</code> element with class <code>blue</code> should have a <code>background-color</code> of blue.');
   - text: The <code>div</code> element with class <code>yellow</code> should have a <code>background-color</code> of yellow.
-    testString: 'assert($(".yellow").css("background-color") == "rgb(255, 255, 0)", "The <code>div</code> element with class <code>yellow</code> should have a <code>background-color</code> of yellow.");'
+    testString: assert($('.yellow').css('background-color') == 'rgb(255, 255, 0)', 'The <code>div</code> element with class <code>yellow</code> should have a <code>background-color</code> of yellow.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-tertiary-colors.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-tertiary-colors.english.md
index a2f62b2e0a..6aff0eb080 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-tertiary-colors.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-about-tertiary-colors.english.md
@@ -25,11 +25,11 @@ Change the <code>background-color</code> property of the <code>orange</code>, <c
 ```yml
 tests:
   - text: The <code>div</code> element with class <code>orange</code> should have a <code>background-color</code> of orange.
-    testString: 'assert($(".orange").css("background-color") == "rgb(255, 125, 0)", "The <code>div</code> element with class <code>orange</code> should have a <code>background-color</code> of orange.");'
+    testString: assert($('.orange').css('background-color') == 'rgb(255, 125, 0)', 'The <code>div</code> element with class <code>orange</code> should have a <code>background-color</code> of orange.');
   - text: The <code>div</code> element with class <code>cyan</code> should have a <code>background-color</code> of cyan.
-    testString: 'assert($(".cyan").css("background-color") == "rgb(0, 255, 255)", "The <code>div</code> element with class <code>cyan</code> should have a <code>background-color</code> of cyan.");'
+    testString: assert($('.cyan').css('background-color') == 'rgb(0, 255, 255)', 'The <code>div</code> element with class <code>cyan</code> should have a <code>background-color</code> of cyan.');
   - text: The <code>div</code> element with class <code>raspberry</code> should have a <code>background-color</code> of raspberry.
-    testString: 'assert($(".raspberry").css("background-color") == "rgb(255, 0, 125)", "The <code>div</code> element with class <code>raspberry</code> should have a <code>background-color</code> of raspberry.");'
+    testString: assert($('.raspberry').css('background-color') == 'rgb(255, 0, 125)', 'The <code>div</code> element with class <code>raspberry</code> should have a <code>background-color</code> of raspberry.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-bezier-curves-work.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-bezier-curves-work.english.md
index d208724a2c..4e55f82328 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-bezier-curves-work.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-bezier-curves-work.english.md
@@ -25,9 +25,9 @@ For the element with the id of <code>ball1</code>, change the value of the <code
 ```yml
 tests:
   - text: The value of the <code>animation-timing-function</code> property for the element with the id <code>ball1</code> should be the linear-equivalent cubic-bezier function.
-    testString: 'assert($("#ball1").css("animation-timing-function") == "cubic-bezier(0.25, 0.25, 0.75, 0.75)", "The value of the <code>animation-timing-function</code> property for the element with the id <code>ball1</code> should be the linear-equivalent cubic-bezier function.");'
+    testString: assert($('#ball1').css('animation-timing-function') == 'cubic-bezier(0.25, 0.25, 0.75, 0.75)', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>ball1</code> should be the linear-equivalent cubic-bezier function.');
   - text: The value of the <code>animation-timing-function</code> property for the element with the id <code>ball2</code> should not change.
-    testString: 'assert($("#ball2").css("animation-timing-function") == "ease-out", "The value of the <code>animation-timing-function</code> property for the element with the id <code>ball2</code> should not change.");'
+    testString: assert($('#ball2').css('animation-timing-function') == 'ease-out', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>ball2</code> should not change.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-the-css-keyframes-and-animation-properties-work.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-the-css-keyframes-and-animation-properties-work.english.md
index 5f6e3f6acd..1b4e180696 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-the-css-keyframes-and-animation-properties-work.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/learn-how-the-css-keyframes-and-animation-properties-work.english.md
@@ -26,17 +26,17 @@ Create an animation for the element with the id <code>rect</code>, by setting th
 ```yml
 tests:
   - text: The element with id of <code>rect</code> should have an <code>animation-name</code> property with a value of rainbow.
-    testString: 'assert($("#rect").css("animation-name") == "rainbow", "The element with id of <code>rect</code> should have an <code>animation-name</code> property with a value of rainbow.");'
+    testString: assert($('#rect').css('animation-name') == 'rainbow', 'The element with id of <code>rect</code> should have an <code>animation-name</code> property with a value of rainbow.');
   - text: The element with id of <code>rect</code> should have an <code>animation-duration</code> property with a value of 4s.
-    testString: 'assert($("#rect").css("animation-duration") == "4s", "The element with id of <code>rect</code> should have an <code>animation-duration</code> property with a value of 4s.");'
+    testString: assert($('#rect').css('animation-duration') == '4s', 'The element with id of <code>rect</code> should have an <code>animation-duration</code> property with a value of 4s.');
   - text: The <code>@keyframes</code> rule should use the <code>animation-name</code> of rainbow.
-    testString: 'assert(code.match(/@keyframes\s+?rainbow\s*?{/g), "The <code>@keyframes</code> rule should use the <code>animation-name</code> of rainbow.");'
+    testString: assert(code.match(/@keyframes\s+?rainbow\s*?{/g), 'The <code>@keyframes</code> rule should use the <code>animation-name</code> of rainbow.');
   - text: The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of blue at 0%.
-    testString: 'assert(code.match(/0%\s*?{\s*?background-color:\s*?blue;\s*?}/gi), "The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of blue at 0%.");'
+    testString: assert(code.match(/0%\s*?{\s*?background-color:\s*?blue;\s*?}/gi), 'The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of blue at 0%.');
   - text: The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of green at 50%.
-    testString: 'assert(code.match(/50%\s*?{\s*?background-color:\s*?green;\s*?}/gi), "The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of green at 50%.");'
+    testString: assert(code.match(/50%\s*?{\s*?background-color:\s*?green;\s*?}/gi), 'The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of green at 50%.');
   - text: The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of yellow at 100%.
-    testString: 'assert(code.match(/100%\s*?{\s*?background-color:\s*?yellow;\s*?}/gi), "The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of yellow at 100%.");'
+    testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?yellow;\s*?}/gi), 'The <code>@keyframes</code> rule for rainbow should use a <code>background-color</code> of yellow at 100%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-its-parent-with-absolute-positioning.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-its-parent-with-absolute-positioning.english.md
index 7f0cf85c44..c6f9bce302 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-its-parent-with-absolute-positioning.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-its-parent-with-absolute-positioning.english.md
@@ -21,12 +21,12 @@ Lock the <code>#searchbar</code> element to the top-right of its <code>section</
 
 ```yml
 tests:
-  - text: 'The <code>#searchbar</code> element should have a <code>position</code> set to <code>absolute</code>.'
-    testString: 'assert($("#searchbar").css("position") == "absolute", "The <code>#searchbar</code> element should have a <code>position</code> set to <code>absolute</code>.");'
-  - text: 'Your code should use the <code>top</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.'
-    testString: 'assert($("#searchbar").css("top") == "50px", "Your code should use the <code>top</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.");'
-  - text: 'Your code should use the <code>right</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.'
-    testString: 'assert($("#searchbar").css("right") == "50px", "Your code should use the <code>right</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.");'
+  - text: The <code>#searchbar</code> element should have a <code>position</code> set to <code>absolute</code>.
+    testString: assert($('#searchbar').css('position') == 'absolute', 'The <code>#searchbar</code> element should have a <code>position</code> set to <code>absolute</code>.');
+  - text: Your code should use the <code>top</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.
+    testString: assert($('#searchbar').css('top') == '50px', 'Your code should use the <code>top</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.');
+  - text: Your code should use the <code>right</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.
+    testString: assert($('#searchbar').css('right') == '50px', 'Your code should use the <code>right</code> CSS offset of 50 pixels on the <code>#searchbar</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-the-browser-window-with-fixed-positioning.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-the-browser-window-with-fixed-positioning.english.md
index 93811b1622..44a3321af4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-the-browser-window-with-fixed-positioning.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/lock-an-element-to-the-browser-window-with-fixed-positioning.english.md
@@ -21,12 +21,12 @@ The navigation bar in the code is labeled with an id of <code>navbar</code>. Cha
 
 ```yml
 tests:
-  - text: 'The <code>#navbar</code> element should have a <code>position</code> set to <code>fixed</code>.'
-    testString: 'assert($("#navbar").css("position") == "fixed", "The <code>#navbar</code> element should have a <code>position</code> set to <code>fixed</code>.");'
-  - text: 'Your code should use the <code>top</code> CSS offset of 0 pixels on the <code>#navbar</code> element.'
-    testString: 'assert($("#navbar").css("top") == "0px", "Your code should use the <code>top</code> CSS offset of 0 pixels on the <code>#navbar</code> element.");'
-  - text: 'Your code should use the <code>left</code> CSS offset of 0 pixels on the <code>#navbar</code> element.'
-    testString: 'assert($("#navbar").css("left") == "0px", "Your code should use the <code>left</code> CSS offset of 0 pixels on the <code>#navbar</code> element.");'
+  - text: The <code>#navbar</code> element should have a <code>position</code> set to <code>fixed</code>.
+    testString: assert($('#navbar').css('position') == 'fixed', 'The <code>#navbar</code> element should have a <code>position</code> set to <code>fixed</code>.');
+  - text: Your code should use the <code>top</code> CSS offset of 0 pixels on the <code>#navbar</code> element.
+    testString: assert($('#navbar').css('top') == '0px', 'Your code should use the <code>top</code> CSS offset of 0 pixels on the <code>#navbar</code> element.');
+  - text: Your code should use the <code>left</code> CSS offset of 0 pixels on the <code>#navbar</code> element.
+    testString: assert($('#navbar').css('left') == '0px', 'Your code should use the <code>left</code> CSS offset of 0 pixels on the <code>#navbar</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-a-css-heartbeat-using-an-infinite-animation-count.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-a-css-heartbeat-using-an-infinite-animation-count.english.md
index f8d04d142c..bd7196c088 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-a-css-heartbeat-using-an-infinite-animation-count.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-a-css-heartbeat-using-an-infinite-animation-count.english.md
@@ -22,9 +22,9 @@ Keep the heart beating by adding the <code>animation-iteration-count</code> prop
 ```yml
 tests:
   - text: The <code>animation-iteration-count</code> property for the <code>heart</code> class should have a value of infinite.
-    testString: 'assert($(".heart").css("animation-iteration-count") == "infinite", "The <code>animation-iteration-count</code> property for the <code>heart</code> class should have a value of infinite.");'
+    testString: assert($('.heart').css('animation-iteration-count') == 'infinite', 'The <code>animation-iteration-count</code> property for the <code>heart</code> class should have a value of infinite.');
   - text: The <code>animation-iteration-count</code> property for the <code>back</code> class should have a value of infinite.
-    testString: 'assert($(".back").css("animation-iteration-count") == "infinite", "The <code>animation-iteration-count</code> property for the <code>back</code> class should have a value of infinite.");'
+    testString: assert($('.back').css('animation-iteration-count') == 'infinite', 'The <code>animation-iteration-count</code> property for the <code>back</code> class should have a value of infinite.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-motion-more-natural-using-a-bezier-curve.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-motion-more-natural-using-a-bezier-curve.english.md
index f4a2ebe951..c392300a43 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-motion-more-natural-using-a-bezier-curve.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/make-motion-more-natural-using-a-bezier-curve.english.md
@@ -24,8 +24,8 @@ Change value of the <code>animation-timing-function</code> of the element with t
 
 ```yml
 tests:
-  - text: 'The value of the <code>animation-timing-function</code> property for the element with the id <code>green</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values as specified.'
-    testString: 'assert($("#green").css("animation-timing-function") == "cubic-bezier(0.311, 0.441, 0.444, 1.649)", "The value of the <code>animation-timing-function</code> property for the element with the id <code>green</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values as specified.'
+  - text: The value of the <code>animation-timing-function</code> property for the element with the id <code>green</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values as specified.
+    testString: assert($('#green').css('animation-timing-function') == 'cubic-bezier(0.311, 0.441, 0.444, 1.649)', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>green</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values as specified.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/modify-fill-mode-of-an-animation.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/modify-fill-mode-of-an-animation.english.md
index 9bdfa53c3b..90e94aadb7 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/modify-fill-mode-of-an-animation.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/modify-fill-mode-of-an-animation.english.md
@@ -22,8 +22,8 @@ Set the <code>animation-fill-mode</code> property of <code>button:hover</code> t
 
 ```yml
 tests:
-  - text: '<code>button:hover</code> should have a <code>animation-fill-mode</code> property with a value of <code>forwards</code>.'
-    testString: 'assert(code.match(/button\s*?:\s*?hover\s*?{[\s\S]*animation-fill-mode\s*?:\s*?forwards\s*?;[\s\S]*}/gi) && code.match(/button\s*?:\s*?hover\s*?{[\s\S]*animation-name\s*?:\s*?background-color\s*?;[\s\S]*}/gi) && code.match(/button\s*?:\s*?hover\s*?{[\s\S]*animation-duration\s*?:\s*?500ms\s*?;[\s\S]*}/gi), "<code>button:hover</code> should have a <code>animation-fill-mode</code> property with a value of <code>forwards</code>.");'
+  - text: <code>button:hover</code> should have a <code>animation-fill-mode</code> property with a value of <code>forwards</code>.
+    testString: assert(code.match(/button\s*?:\s*?hover\s*?{[\s\S]*animation-fill-mode\s*?:\s*?forwards\s*?;[\s\S]*}/gi) && code.match(/button\s*?:\s*?hover\s*?{[\s\S]*animation-name\s*?:\s*?background-color\s*?;[\s\S]*}/gi) && code.match(/button\s*?:\s*?hover\s*?{[\s\S]*animation-duration\s*?:\s*?500ms\s*?;[\s\S]*}/gi), '<code>button:hover</code> should have a <code>animation-fill-mode</code> property with a value of <code>forwards</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/move-a-relatively-positioned-element-with-css-offsets.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/move-a-relatively-positioned-element-with-css-offsets.english.md
index 49bf0f7beb..345e62831a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/move-a-relatively-positioned-element-with-css-offsets.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/move-a-relatively-positioned-element-with-css-offsets.english.md
@@ -8,7 +8,7 @@ videoUrl: 'https://scrimba.com/c/c9bQEA4'
 ## Description
 <section id='description'>
 The CSS offsets of <code>top</code> or <code>bottom</code>, and <code>left</code> or <code>right</code> tell the browser how far to offset an item relative to where it would sit in the normal flow of the document. You're offsetting an element away from a given spot, which moves the element away from the referenced side (effectively, the opposite direction). As you saw in the last challenge, using the top offset moved the <code>h2</code> downwards. Likewise, using a left offset moves an item to the right.
-<img src='https://i.imgur.com/eWWi3gZ.gif' alt=" />
+<img src='https://i.imgur.com/eWWi3gZ.gif' alt='' />
 </section>
 
 ## Instructions
@@ -21,10 +21,10 @@ Use CSS offsets to move the <code>h2</code> 15 pixels to the right and 10 pixels
 
 ```yml
 tests:
-  - text: 'Your code should use a CSS offset to relatively position the <code>h2</code> 10px upwards. In other words, move it 10px away from the <code>bottom</code> of where it normally sits.'
-    testString: 'assert($("h2").css("bottom") == "10px", "Your code should use a CSS offset to relatively position the <code>h2</code> 10px upwards. In other words, move it 10px away from the <code>bottom</code> of where it normally sits.");'
-  - text: 'Your code should use a CSS offset to relatively position the <code>h2</code> 15px towards the right. In other words, move it 15px away from the <code>left</code> of where it normally sits.'
-    testString: 'assert($("h2").css("left") == "15px", "Your code should use a CSS offset to relatively position the <code>h2</code> 15px towards the right. In other words, move it 15px away from the <code>left</code> of where it normally sits.");'
+  - text: Your code should use a CSS offset to relatively position the <code>h2</code> 10px upwards. In other words, move it 10px away from the <code>bottom</code> of where it normally sits.
+    testString: assert($('h2').css('bottom') == '10px', 'Your code should use a CSS offset to relatively position the <code>h2</code> 10px upwards. In other words, move it 10px away from the <code>bottom</code> of where it normally sits.');
+  - text: Your code should use a CSS offset to relatively position the <code>h2</code> 15px towards the right. In other words, move it 15px away from the <code>left</code> of where it normally sits.
+    testString: assert($('h2').css('left') == '15px', 'Your code should use a CSS offset to relatively position the <code>h2</code> 15px towards the right. In other words, move it 15px away from the <code>left</code> of where it normally sits.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/push-elements-left-or-right-with-the-float-property.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/push-elements-left-or-right-with-the-float-property.english.md
index f4bb47d152..1907d91b38 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/push-elements-left-or-right-with-the-float-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/push-elements-left-or-right-with-the-float-property.english.md
@@ -21,9 +21,9 @@ The given markup would work well as a two-column layout, with the <code>section<
 ```yml
 tests:
   - text: The element with id <code>left</code> should have a <code>float</code> value of <code>left</code>.
-    testString: 'assert($("#left").css("float") == "left", "The element with id <code>left</code> should have a <code>float</code> value of <code>left</code>.");'
+    testString: assert($('#left').css('float') == 'left', 'The element with id <code>left</code> should have a <code>float</code> value of <code>left</code>.');
   - text: The element with id <code>right</code> should have a <code>float</code> value of <code>right</code>.
-    testString: 'assert($("#right").css("float") == "right", "The element with id <code>right</code> should have a <code>float</code> value of <code>right</code>.");'
+    testString: assert($('#right').css('float') == 'right', 'The element with id <code>right</code> should have a <code>float</code> value of <code>right</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-for-multiple-heading-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-for-multiple-heading-elements.english.md
index c6db59d412..94cfbe5037 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-for-multiple-heading-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-for-multiple-heading-elements.english.md
@@ -21,17 +21,17 @@ The <code>font-size</code> property is used to specify how large the text is in
 ```yml
 tests:
   - text: Your code should set the <code>font-size</code> property for the <code>h1</code> tag to 68 pixels.
-    testString: 'assert($("h1").css("font-size") == "68px", "Your code should set the <code>font-size</code> property for the <code>h1</code> tag to 68 pixels.");'
+    testString: assert($('h1').css('font-size') == '68px', 'Your code should set the <code>font-size</code> property for the <code>h1</code> tag to 68 pixels.');
   - text: Your code should set the <code>font-size</code> property for the <code>h2</code> tag to 52 pixels.
-    testString: 'assert($("h2").css("font-size") == "52px", "Your code should set the <code>font-size</code> property for the <code>h2</code> tag to 52 pixels.");'
+    testString: assert($('h2').css('font-size') == '52px', 'Your code should set the <code>font-size</code> property for the <code>h2</code> tag to 52 pixels.');
   - text: Your code should set the <code>font-size</code> property for the <code>h3</code> tag to 40 pixels.
-    testString: 'assert($("h3").css("font-size") == "40px", "Your code should set the <code>font-size</code> property for the <code>h3</code> tag to 40 pixels.");'
+    testString: assert($('h3').css('font-size') == '40px', 'Your code should set the <code>font-size</code> property for the <code>h3</code> tag to 40 pixels.');
   - text: Your code should set the <code>font-size</code> property for the <code>h4</code> tag to 32 pixels.
-    testString: 'assert($("h4").css("font-size") == "32px", "Your code should set the <code>font-size</code> property for the <code>h4</code> tag to 32 pixels.");'
+    testString: assert($('h4').css('font-size') == '32px', 'Your code should set the <code>font-size</code> property for the <code>h4</code> tag to 32 pixels.');
   - text: Your code should set the <code>font-size</code> property for the <code>h5</code> tag to 21 pixels.
-    testString: 'assert($("h5").css("font-size") == "21px", "Your code should set the <code>font-size</code> property for the <code>h5</code> tag to 21 pixels.");'
+    testString: assert($('h5').css('font-size') == '21px', 'Your code should set the <code>font-size</code> property for the <code>h5</code> tag to 21 pixels.');
   - text: Your code should set the <code>font-size</code> property for the <code>h6</code> tag to 14 pixels.
-    testString: 'assert($("h6").css("font-size") == "14px", "Your code should set the <code>font-size</code> property for the <code>h6</code> tag to 14 pixels.");'
+    testString: assert($('h6').css('font-size') == '14px', 'Your code should set the <code>font-size</code> property for the <code>h6</code> tag to 14 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-of-paragraph-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-of-paragraph-text.english.md
index 6e55c2b872..3830c6060f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-of-paragraph-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-size-of-paragraph-text.english.md
@@ -21,7 +21,7 @@ Change the value of the <code>font-size</code> property for the paragraph to 16p
 ```yml
 tests:
   - text: Your <code>p</code> tag should have a <code>font-size</code> of 16 pixels.
-    testString: 'assert($("p").css("font-size") == "16px", "Your <code>p</code> tag should have a <code>font-size</code> of 16 pixels.");'
+    testString: assert($('p').css('font-size') == '16px', 'Your <code>p</code> tag should have a <code>font-size</code> of 16 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-weight-for-multiple-heading-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-weight-for-multiple-heading-elements.english.md
index c904453c4e..6f09dca48c 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-weight-for-multiple-heading-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-font-weight-for-multiple-heading-elements.english.md
@@ -22,17 +22,17 @@ The <code>font-weight</code> property sets how thick or thin characters are in a
 ```yml
 tests:
   - text: Your code should set the <code>font-weight</code> property for the <code>h1</code> tag to 800.
-    testString: 'assert($("h1").css("font-weight") == "800", "Your code should set the <code>font-weight</code> property for the <code>h1</code> tag to 800.");'
+    testString: assert($('h1').css('font-weight') == '800', 'Your code should set the <code>font-weight</code> property for the <code>h1</code> tag to 800.');
   - text: Your code should set the <code>font-weight</code> property for the <code>h2</code> tag to 600.
-    testString: 'assert($("h2").css("font-weight") == "600", "Your code should set the <code>font-weight</code> property for the <code>h2</code> tag to 600.");'
+    testString: assert($('h2').css('font-weight') == '600', 'Your code should set the <code>font-weight</code> property for the <code>h2</code> tag to 600.');
   - text: Your code should set the <code>font-weight</code> property for the <code>h3</code> tag to 500.
-    testString: 'assert($("h3").css("font-weight") == "500", "Your code should set the <code>font-weight</code> property for the <code>h3</code> tag to 500.");'
+    testString: assert($('h3').css('font-weight') == '500', 'Your code should set the <code>font-weight</code> property for the <code>h3</code> tag to 500.');
   - text: Your code should set the <code>font-weight</code> property for the <code>h4</code> tag to 400.
-    testString: 'assert($("h4").css("font-weight") == "400", "Your code should set the <code>font-weight</code> property for the <code>h4</code> tag to 400.");'
+    testString: assert($('h4').css('font-weight') == '400', 'Your code should set the <code>font-weight</code> property for the <code>h4</code> tag to 400.');
   - text: Your code should set the <code>font-weight</code> property for the <code>h5</code> tag to 300.
-    testString: 'assert($("h5").css("font-weight") == "300", "Your code should set the <code>font-weight</code> property for the <code>h5</code> tag to 300.");'
+    testString: assert($('h5').css('font-weight') == '300', 'Your code should set the <code>font-weight</code> property for the <code>h5</code> tag to 300.');
   - text: Your code should set the <code>font-weight</code> property for the <code>h6</code> tag to 200.
-    testString: 'assert($("h6").css("font-weight") == "200", "Your code should set the <code>font-weight</code> property for the <code>h6</code> tag to 200.");'
+    testString: assert($('h6').css('font-weight') == '200', 'Your code should set the <code>font-weight</code> property for the <code>h6</code> tag to 200.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-line-height-of-paragraphs.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-line-height-of-paragraphs.english.md
index d9ceee59b2..6610306d79 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-line-height-of-paragraphs.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/set-the-line-height-of-paragraphs.english.md
@@ -21,7 +21,7 @@ Add a <code>line-height</code> property to the <code>p</code> tag and set it to
 ```yml
 tests:
   - text: Your code should set the <code>line-height</code> of the <code>p</code> tag to 25 pixels.
-    testString: 'assert($("p").css("line-height") == "25px", "Your code should set the <code>line-height</code> of the <code>p</code> tag to 25 pixels.");'
+    testString: assert($('p').css('line-height') == '25px', 'Your code should set the <code>line-height</code> of the <code>p</code> tag to 25 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-bezier-curve-to-move-a-graphic.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-bezier-curve-to-move-a-graphic.english.md
index e94576a20f..e75a6c4f5f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-bezier-curve-to-move-a-graphic.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-bezier-curve-to-move-a-graphic.english.md
@@ -23,12 +23,12 @@ To see the effect of this Bezier curve in action, change the <code>animation-tim
 
 ```yml
 tests:
-  - text: 'The value of the <code>animation-timing-function</code> property of the element with the id <code>red</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values set respectively to 0, 0, 0.58, 1 .'
-    testString: 'assert($("#red").css("animation-timing-function") == "cubic-bezier(0, 0, 0.58, 1)", "The value of the <code>animation-timing-function</code> property of the element with the id <code>red</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values set respectively to 0, 0, 0.58, 1 .");'
+  - text: The value of the <code>animation-timing-function</code> property of the element with the id <code>red</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values set respectively to 0, 0, 0.58, 1 .
+    testString: assert($('#red').css('animation-timing-function') == 'cubic-bezier(0, 0, 0.58, 1)', 'The value of the <code>animation-timing-function</code> property of the element with the id <code>red</code> should be a <code>cubic-bezier</code> function with x1, y1, x2, y2 values set respectively to 0, 0, 0.58, 1 .');
   - text: The element with the id <code>red</code> should no longer have the <code>animation-timing-function</code> property of linear.
-    testString: 'assert($("#red").css("animation-timing-function") !== "linear", "The element with the id <code>red</code> should no longer have the <code>animation-timing-function</code> property of linear.");'
+    testString: assert($('#red').css('animation-timing-function') !== 'linear', 'The element with the id <code>red</code> should no longer have the <code>animation-timing-function</code> property of linear.');
   - text: The value of the <code>animation-timing-function</code> property for the element with the id <code>blue</code> should not change.
-    testString: 'assert($("#blue").css("animation-timing-function") == "ease-out", "The value of the <code>animation-timing-function</code> property for the element with the id <code>blue</code> should not change.");'
+    testString: assert($('#blue').css('animation-timing-function') == 'ease-out', 'The value of the <code>animation-timing-function</code> property for the element with the id <code>blue</code> should not change.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-css-linear-gradient-to-create-a-striped-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-css-linear-gradient-to-create-a-striped-element.english.md
index 1e2e2c1c03..4d15bed822 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-css-linear-gradient-to-create-a-striped-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-a-css-linear-gradient-to-create-a-striped-element.english.md
@@ -26,17 +26,17 @@ Make stripes by changing the <code>repeating-linear-gradient()</code> to use a g
 ```yml
 tests:
   - text: The angle of the <code>repeating-linear-gradient()</code> should be 45deg.
-    testString: 'assert(code.match(/background:\s*?repeating-linear-gradient\(\s*?45deg/gi), "The angle of the <code>repeating-linear-gradient()</code> should be 45deg.");'
+    testString: assert(code.match(/background:\s*?repeating-linear-gradient\(\s*?45deg/gi), 'The angle of the <code>repeating-linear-gradient()</code> should be 45deg.');
   - text: The angle of the <code>repeating-linear-gradient()</code> should no longer be 90deg
-    testString: 'assert(!code.match(/90deg/gi), "The angle of the <code>repeating-linear-gradient()</code> should no longer be 90deg");'
+    testString: assert(!code.match(/90deg/gi), 'The angle of the <code>repeating-linear-gradient()</code> should no longer be 90deg');
   - text: The color stop at 0 pixels should be <code>yellow</code>.
-    testString: 'assert(code.match(/yellow\s+?0(px)?/gi), "The color stop at 0 pixels should be <code>yellow</code>.");'
+    testString: assert(code.match(/yellow\s+?0(px)?/gi), 'The color stop at 0 pixels should be <code>yellow</code>.');
   - text: One color stop at 40 pixels should be <code>yellow</code>.
-    testString: 'assert(code.match(/yellow\s+?40px/gi), "One color stop at 40 pixels should be <code>yellow</code>.");'
+    testString: assert(code.match(/yellow\s+?40px/gi), 'One color stop at 40 pixels should be <code>yellow</code>.');
   - text: The second color stop at 40 pixels should be <code>black</code>.
-    testString: 'assert(code.match(/yellow\s+?40px,\s*?black\s+?40px/gi), "The second color stop at 40 pixels should be <code>black</code>.");'
+    testString: assert(code.match(/yellow\s+?40px,\s*?black\s+?40px/gi), 'The second color stop at 40 pixels should be <code>black</code>.');
   - text: The last color stop at 80 pixels should be <code>black</code>.
-    testString: 'assert(code.match(/black\s+?80px/gi), "The last color stop at 80 pixels should be <code>black</code>.");'
+    testString: assert(code.match(/black\s+?80px/gi), 'The last color stop at 80 pixels should be <code>black</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-css-animation-to-change-the-hover-state-of-a-button.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-css-animation-to-change-the-hover-state-of-a-button.english.md
index 1b6475f889..8bf858b3f7 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-css-animation-to-change-the-hover-state-of-a-button.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-css-animation-to-change-the-hover-state-of-a-button.english.md
@@ -24,9 +24,9 @@ Use CSS <code>@keyframes</code> to change the <code>background-color</code> of t
 ```yml
 tests:
   - text: The @keyframes rule should use the <code>animation-name</code> background-color.
-    testString: 'assert(code.match(/@keyframes\s+?background-color\s*?{/g), "The @keyframes rule should use the <code>animation-name</code> background-color.");'
-  - text: 'There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.'
-    testString: 'assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi), "There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.");'
+    testString: assert(code.match(/@keyframes\s+?background-color\s*?{/g), 'The @keyframes rule should use the <code>animation-name</code> background-color.');
+  - text: There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.
+    testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi), 'There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewx-to-skew-an-element-along-the-x-axis.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewx-to-skew-an-element-along-the-x-axis.english.md
index b3027aab43..cb07c9f057 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewx-to-skew-an-element-along-the-x-axis.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewx-to-skew-an-element-along-the-x-axis.english.md
@@ -23,7 +23,7 @@ Skew the element with the id of <code>bottom</code> by 24 degrees along the X-ax
 ```yml
 tests:
   - text: The element with id <code>bottom</code> should be skewed by 24 degrees along its X-axis.
-    testString: 'assert(code.match(/#bottom\s*?{\s*?.*?\s*?transform:\s*?skewX\(24deg\);/g), "The element with id <code>bottom</code> should be skewed by 24 degrees along its X-axis.");'
+    testString: assert(code.match(/#bottom\s*?{\s*?.*?\s*?transform:\s*?skewX\(24deg\);/g), 'The element with id <code>bottom</code> should be skewed by 24 degrees along its X-axis.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewy-to-skew-an-element-along-the-y-axis.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewy-to-skew-an-element-along-the-y-axis.english.md
index 8282274b53..39c612851d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewy-to-skew-an-element-along-the-y-axis.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-property-skewy-to-skew-an-element-along-the-y-axis.english.md
@@ -21,7 +21,7 @@ Skew the element with the id of <code>top</code> -10 degrees along the Y-axis by
 ```yml
 tests:
   - text: The element with id <code>top</code> should be skewed by -10 degrees along its Y-axis.
-    testString: 'assert(code.match(/#top\s*?{\s*?.*?\s*?transform:\s*?skewY\(-10deg\);/g), "The element with id <code>top</code> should be skewed by -10 degrees along its Y-axis.");'
+    testString: assert(code.match(/#top\s*?{\s*?.*?\s*?transform:\s*?skewY\(-10deg\);/g), 'The element with id <code>top</code> should be skewed by -10 degrees along its Y-axis.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-change-the-size-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-change-the-size-of-an-element.english.md
index 854d50667f..21dba1ab8d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-change-the-size-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-change-the-size-of-an-element.english.md
@@ -21,8 +21,8 @@ Increase the size of the element with the id of <code>ball2</code> to 1.5 times
 
 ```yml
 tests:
-  - text: 'Set the <code>transform</code> property for <code>#ball2</code> to scale it 1.5 times its size.'
-    testString: 'assert(code.match(/#ball2\s*?{\s*?left:\s*?65%;\s*?transform:\s*?scale\(1\.5\);\s*?}|#ball2\s*?{\s*?transform:\s*?scale\(1\.5\);\s*?left:\s*?65%;\s*?}/gi), "Set the <code>transform</code> property for <code>#ball2</code> to scale it 1.5 times its size.");'
+  - text: Set the <code>transform</code> property for <code>#ball2</code> to scale it 1.5 times its size.
+    testString: assert(code.match(/#ball2\s*?{\s*?left:\s*?65%;\s*?transform:\s*?scale\(1\.5\);\s*?}|#ball2\s*?{\s*?transform:\s*?scale\(1\.5\);\s*?left:\s*?65%;\s*?}/gi), 'Set the <code>transform</code> property for <code>#ball2</code> to scale it 1.5 times its size.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-scale-an-element-on-hover.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-scale-an-element-on-hover.english.md
index c155a8f7a3..d3ea6ff792 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-scale-an-element-on-hover.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-css-transform-scale-property-to-scale-an-element-on-hover.english.md
@@ -23,7 +23,7 @@ Add a CSS rule for the <code>hover</code> state of the <code>div</code> and use
 ```yml
 tests:
   - text: The size of the <code>div</code> element should scale 1.1 times when the user hovers over it.
-    testString: 'assert(code.match(/div:hover\s*?{\s*?transform:\s*?scale\(1\.1\);/gi), "The size of the <code>div</code> element should scale 1.1 times when the user hovers over it.");'
+    testString: assert(code.match(/div:hover\s*?{\s*?transform:\s*?scale\(1\.1\);/gi), 'The size of the <code>div</code> element should scale 1.1 times when the user hovers over it.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-em-tag-to-italicize-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-em-tag-to-italicize-text.english.md
index 58eee50551..6a69864bc6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-em-tag-to-italicize-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-em-tag-to-italicize-text.english.md
@@ -21,9 +21,9 @@ Wrap an <code>em</code> tag around the contents of the paragraph tag to give it
 ```yml
 tests:
   - text: Your code should add an <code>em</code> tag to the markup.
-    testString: 'assert($("em").length == 1, "Your code should add an <code>em</code> tag to the markup.");'
+    testString: assert($('em').length == 1, 'Your code should add an <code>em</code> tag to the markup.');
   - text: The <code>em</code> tag should wrap around the contents of the <code>p</code> tag but not the <code>p</code> tag itself.
-    testString: 'assert($("p").children().length == 1 && $("em").children().length == 2, "The <code>em</code> tag should wrap around the contents of the <code>p</code> tag but not the <code>p</code> tag itself.");'
+    testString: assert($('p').children().length == 1 && $('em').children().length == 2, 'The <code>em</code> tag should wrap around the contents of the <code>p</code> tag but not the <code>p</code> tag itself.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-s-tag-to-strikethrough-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-s-tag-to-strikethrough-text.english.md
index f5383ef283..04651e1545 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-s-tag-to-strikethrough-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-s-tag-to-strikethrough-text.english.md
@@ -21,11 +21,11 @@ Wrap the <code>s</code> tag around "Google" inside the <code>h4</code> tag and t
 ```yml
 tests:
   - text: Your code should add one <code>s</code> tag to the markup.
-    testString: 'assert($("s").length == 1, "Your code should add one <code>s</code> tag to the markup.");'
+    testString: assert($('s').length == 1, 'Your code should add one <code>s</code> tag to the markup.');
   - text: A <code>s</code> tag should wrap around the Google text in the <code>h4</code> tag. It should not contain the word Alphabet.
-    testString: 'assert($("s").text().match(/Google/gi) && !$("s").text().match(/Alphabet/gi), "A <code>s</code> tag should wrap around the Google text in the <code>h4</code> tag. It should not contain the word Alphabet.");'
-  - text: 'Include the word Alphabet in the <code>h4</code> tag, without strikethrough formatting.'
-    testString: 'assert($("h4").html().match(/Alphabet/gi), "Include the word Alphabet in the <code>h4</code> tag, without strikethrough formatting.");'
+    testString: assert($('s').text().match(/Google/gi) && !$('s').text().match(/Alphabet/gi), 'A <code>s</code> tag should wrap around the Google text in the <code>h4</code> tag. It should not contain the word Alphabet.');
+  - text: Include the word Alphabet in the <code>h4</code> tag, without strikethrough formatting.
+    testString: assert($('h4').html().match(/Alphabet/gi), 'Include the word Alphabet in the <code>h4</code> tag, without strikethrough formatting.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-strong-tag-to-make-text-bold.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-strong-tag-to-make-text-bold.english.md
index 7704ea46ed..bf38a2021b 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-strong-tag-to-make-text-bold.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-strong-tag-to-make-text-bold.english.md
@@ -21,11 +21,11 @@ Wrap a <code>strong</code> tag around "Stanford University" inside the <code>p</
 ```yml
 tests:
   - text: Your code should add one <code>strong</code> tag to the markup.
-    testString: 'assert($("strong").length == 1, "Your code should add one <code>strong</code> tag to the markup.");'
+    testString: assert($('strong').length == 1, 'Your code should add one <code>strong</code> tag to the markup.');
   - text: The <code>strong</code> tag should be inside the <code>p</code> tag.
-    testString: 'assert($("p").children("strong").length == 1, "The <code>strong</code> tag should be inside the <code>p</code> tag.");'
+    testString: assert($('p').children('strong').length == 1, 'The <code>strong</code> tag should be inside the <code>p</code> tag.');
   - text: The <code>strong</code> tag should wrap around the words "Stanford University".
-    testString: 'assert($("strong").text().match(/^Stanford University$/gi), "The <code>strong</code> tag should wrap around the words "Stanford University".");'
+    testString: assert($('strong').text().match(/^Stanford University$/gi), 'The <code>strong</code> tag should wrap around the words "Stanford University".');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-text-transform-property-to-make-text-uppercase.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-text-transform-property-to-make-text-uppercase.english.md
index 8944c686e8..051e4d7943 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-text-transform-property-to-make-text-uppercase.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-text-transform-property-to-make-text-uppercase.english.md
@@ -23,9 +23,9 @@ Transform the text of the <code>h4</code> to be uppercase using the <code>text-t
 ```yml
 tests:
   - text: The <code>h4</code> text should be uppercase.
-    testString: 'assert($("h4").css("text-transform") === "uppercase", "The <code>h4</code> text should be uppercase.");'
+    testString: assert($('h4').css('text-transform') === 'uppercase', 'The <code>h4</code> text should be uppercase.');
   - text: The original text of the h4 should not be changed.
-    testString: 'assert(($("h4").text() !== $("h4").text().toUpperCase()), "The original text of the h4 should not be changed.");'
+    testString: assert(($('h4').text() !== $('h4').text().toUpperCase()), 'The original text of the h4 should not be changed.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-u-tag-to-underline-text.english.md b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-u-tag-to-underline-text.english.md
index 60bfa03f1d..099373984d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-u-tag-to-underline-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-the-u-tag-to-underline-text.english.md
@@ -22,9 +22,9 @@ Wrap the <code>u</code> tag only around the text "Ph.D. students".
 ```yml
 tests:
   - text: Your code should add a <code>u</code> tag to the markup.
-    testString: 'assert($("u").length === 1, "Your code should add a <code>u</code> tag to the markup.");'
+    testString: assert($('u').length === 1, 'Your code should add a <code>u</code> tag to the markup.');
   - text: The <code>u</code> tag should wrap around the text "Ph.D. students".
-    testString: 'assert($("u").text() === "Ph.D. students", "The <code>u</code> tag should wrap around the text "Ph.D. students".");'
+    testString: assert($('u').text() === 'Ph.D. students', 'The <code>u</code> tag should wrap around the text "Ph.D. students".');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-a-negative-margin-to-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-a-negative-margin-to-an-element.english.md
index f2d2349b43..0a9b2b9b92 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-a-negative-margin-to-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-a-negative-margin-to-an-element.english.md
@@ -24,7 +24,7 @@ Change the <code>margin</code> of the blue box to <code>-15px</code>, so it fill
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give elements <code>-15px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-top") === "-15px", "Your <code>blue-box</code> class should give elements <code>-15px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-top") === "-15px", 'Your <code>blue-box</code> class should give elements <code>-15px</code> of <code>margin</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md
index 08d920848f..052df8d144 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-borders-around-your-elements.english.md
@@ -26,15 +26,15 @@ Remember that you can apply multiple classes to an element using its <code>class
 ```yml
 tests:
   - text: Your <code>img</code> element should have the class <code>smaller-image</code>.
-    testString: 'assert($("img").hasClass("smaller-image"), "Your <code>img</code> element should have the class <code>smaller-image</code>.");'
+    testString: assert($("img").hasClass("smaller-image"), 'Your <code>img</code> element should have the class <code>smaller-image</code>.');
   - text: Your <code>img</code> element should have the class <code>thick-green-border</code>.
-    testString: 'assert($("img").hasClass("thick-green-border"), "Your <code>img</code> element should have the class <code>thick-green-border</code>.");'
+    testString: assert($("img").hasClass("thick-green-border"), 'Your <code>img</code> element should have the class <code>thick-green-border</code>.');
   - text: Give your image a border width of <code>10px</code>.
-    testString: 'assert($("img").hasClass("thick-green-border") && parseInt($("img").css("border-top-width"), 10) >= 8 && parseInt($("img").css("border-top-width"), 10) <= 12, "Give your image a border width of <code>10px</code>.");'
+    testString: assert($("img").hasClass("thick-green-border") && parseInt($("img").css("border-top-width"), 10) >= 8 && parseInt($("img").css("border-top-width"), 10) <= 12, 'Give your image a border width of <code>10px</code>.');
   - text: Give your image a border style of <code>solid</code>.
-    testString: 'assert($("img").css("border-right-style") === "solid", "Give your image a border style of <code>solid</code>.");'
+    testString: assert($("img").css("border-right-style") === "solid", 'Give your image a border style of <code>solid</code>.');
   - text: The border around your <code>img</code> element should be green.
-    testString: 'assert($("img").css("border-left-color") === "rgb(0, 128, 0)", "The border around your <code>img</code> element should be green.");'
+    testString: assert($("img").css("border-left-color") === "rgb(0, 128, 0)", 'The border around your <code>img</code> element should be green.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-margins-to-each-side-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-margins-to-each-side-of-an-element.english.md
index e5a5c2be88..6517f9f6e6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-margins-to-each-side-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-margins-to-each-side-of-an-element.english.md
@@ -22,13 +22,13 @@ Give the blue box a <code>margin</code> of <code>40px</code> on its top and left
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-top") === "40px", "Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-top") === "40px", 'Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>margin</code>.');
   - text: Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-right") === "20px", "Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-right") === "20px", 'Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>margin</code>.');
   - text: Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-bottom") === "20px", "Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-bottom") === "20px", 'Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>margin</code>.');
   - text: Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-left") === "40px", "Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-left") === "40px", 'Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>margin</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-padding-to-each-side-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-padding-to-each-side-of-an-element.english.md
index f567940a65..69aadaa4a9 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-padding-to-each-side-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-different-padding-to-each-side-of-an-element.english.md
@@ -23,13 +23,13 @@ Give the blue box a <code>padding</code> of <code>40px</code> on its top and lef
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give the top of the elements <code>40px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-top") === "40px", "Your <code>blue-box</code> class should give the top of the elements <code>40px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-top") === "40px", 'Your <code>blue-box</code> class should give the top of the elements <code>40px</code> of <code>padding</code>.');
   - text: Your <code>blue-box</code> class should give the right of the elements <code>20px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-right") === "20px", "Your <code>blue-box</code> class should give the right of the elements <code>20px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-right") === "20px", 'Your <code>blue-box</code> class should give the right of the elements <code>20px</code> of <code>padding</code>.');
   - text: Your <code>blue-box</code> class should give the bottom of the elements <code>20px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-bottom") === "20px", "Your <code>blue-box</code> class should give the bottom of the elements <code>20px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-bottom") === "20px", 'Your <code>blue-box</code> class should give the bottom of the elements <code>20px</code> of <code>padding</code>.');
   - text: Your <code>blue-box</code> class should give the left of the elements <code>40px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-left") === "40px", "Your <code>blue-box</code> class should give the left of the elements <code>40px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-left") === "40px", 'Your <code>blue-box</code> class should give the left of the elements <code>40px</code> of <code>padding</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md
index 535db850ad..f6cb5e949a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/add-rounded-corners-with-border-radius.english.md
@@ -23,9 +23,9 @@ Note: this challenge allows for multiple possible solutions. For example, you ma
 ```yml
 tests:
   - text: Your image element should have the class "thick-green-border".
-    testString: 'assert($("img").hasClass("thick-green-border"), "Your image element should have the class "thick-green-border".");'
+    testString: assert($("img").hasClass("thick-green-border"), 'Your image element should have the class "thick-green-border".');
   - text: Your image should have a border radius of <code>10px</code>
-    testString: 'assert(parseInt($("img").css("border-top-left-radius")) > 8, "Your image should have a border radius of <code>10px</code>");'
+    testString: assert(parseInt($("img").css("border-top-left-radius")) > 8, 'Your image should have a border radius of <code>10px</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-margin-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-margin-of-an-element.english.md
index 0c9043f332..f2220d70ff 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-margin-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-margin-of-an-element.english.md
@@ -24,7 +24,7 @@ Change the <code>margin</code> of the blue box to match that of the red box.
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give elements <code>20px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-top") === "20px", "Your <code>blue-box</code> class should give elements <code>20px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-top") === "20px", 'Your <code>blue-box</code> class should give elements <code>20px</code> of <code>margin</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-padding-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-padding-of-an-element.english.md
index 687d03ef31..2c4552131e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-padding-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/adjust-the-padding-of-an-element.english.md
@@ -27,7 +27,7 @@ Change the <code>padding</code> of your blue box to match that of your red box.
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give elements <code>20px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-top") === "20px", "Your <code>blue-box</code> class should give elements <code>20px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-top") === "20px", 'Your <code>blue-box</code> class should give elements <code>20px</code> of <code>padding</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/attach-a-fallback-value-to-a-css-variable.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/attach-a-fallback-value-to-a-css-variable.english.md
index f07918afde..8f8ff3d5a8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/attach-a-fallback-value-to-a-css-variable.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/attach-a-fallback-value-to-a-css-variable.english.md
@@ -26,9 +26,9 @@ It looks there is a problem with the variables supplied to the <code>.penguin-to
 ```yml
 tests:
   - text: Apply the fallback value of <code>black</code> to the <code>background</code> property of the <code>penguin-top</code> class.
-    testString: 'assert(code.match(/.penguin-top\s*?{[\s\S]*background\s*?:\s*?var\(\s*?--pengiun-skin\s*?,\s*?black\s*?\)\s*?;[\s\S]*}[\s\S]*.penguin-bottom\s{/gi), "Apply the fallback value of <code>black</code> to the <code>background</code> property of the <code>penguin-top</code> class.");'
+    testString: assert(code.match(/.penguin-top\s*?{[\s\S]*background\s*?:\s*?var\(\s*?--pengiun-skin\s*?,\s*?black\s*?\)\s*?;[\s\S]*}[\s\S]*.penguin-bottom\s{/gi), 'Apply the fallback value of <code>black</code> to the <code>background</code> property of the <code>penguin-top</code> class.');
   - text: Apply the fallback value of <code>black</code> to the <code>background</code> property of the <code>penguin-bottom</code> class.
-    testString: 'assert(code.match(/.penguin-bottom\s*?{[\s\S]*background\s*?:\s*?var\(\s*?--pengiun-skin\s*?,\s*?black\s*?\)\s*?;[\s\S]*}/gi), "Apply the fallback value of <code>black</code> to the <code>background</code> property of the <code>penguin-bottom</code> class.");'
+    testString: assert(code.match(/.penguin-bottom\s*?{[\s\S]*background\s*?:\s*?var\(\s*?--pengiun-skin\s*?,\s*?black\s*?\)\s*?;[\s\S]*}/gi), 'Apply the fallback value of <code>black</code> to the <code>background</code> property of the <code>penguin-bottom</code> class.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/cascading-css-variables.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/cascading-css-variables.english.md
index 17f211df58..7f81832a17 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/cascading-css-variables.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/cascading-css-variables.english.md
@@ -22,8 +22,8 @@ Define a variable named <code>--penguin-belly</code> in the <code>:root</code> s
 
 ```yml
 tests:
-  - text: 'declare the <code>--penguin-belly</code> variable in the <code>:root</code> and assign it to <code>pink</code>.'
-    testString: 'assert(code.match(/:root\s*?{[\s\S]*--penguin-belly\s*?:\s*?pink\s*?;[\s\S]*}/gi), "declare the <code>--penguin-belly</code> variable in the <code>:root</code> and assign it to <code>pink</code>.");'
+  - text: declare the <code>--penguin-belly</code> variable in the <code>:root</code> and assign it to <code>pink</code>.
+    testString: assert(code.match(/:root\s*?{[\s\S]*--penguin-belly\s*?:\s*?pink\s*?;[\s\S]*}/gi), 'declare the <code>--penguin-belly</code> variable in the <code>:root</code> and assign it to <code>pink</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-a-variable-for-a-specific-area.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-a-variable-for-a-specific-area.english.md
index 8a337427c7..595fd6c886 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-a-variable-for-a-specific-area.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-a-variable-for-a-specific-area.english.md
@@ -22,7 +22,7 @@ Change the value of <code>--penguin-belly</code> to <code>white</code> in the <c
 ```yml
 tests:
   - text: The <code>penguin</code> class should reassign the <code>--penguin-belly</code> variable to <code>white</code>.
-    testString: 'assert(code.match(/.penguin\s*?{[\s\S]*--penguin-belly\s*?:\s*?white\s*?;[\s\S]*}/gi), "The <code>penguin</code> class should reassign the <code>--penguin-belly</code> variable to <code>white</code>.");'
+    testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-belly\s*?:\s*?white\s*?;[\s\S]*}/gi), 'The <code>penguin</code> class should reassign the <code>--penguin-belly</code> variable to <code>white</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md
index 4cf243ad29..d756c1d660 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-color-of-text.english.md
@@ -26,9 +26,9 @@ Change your <code>h2</code> element's style so that its text color is red.
 ```yml
 tests:
   - text: Your <code>h2</code> element should be red.
-    testString: 'assert($("h2").css("color") === "rgb(255, 0, 0)", "Your <code>h2</code> element should be red.");'
+    testString: assert($("h2").css("color") === "rgb(255, 0, 0)", 'Your <code>h2</code> element should be red.');
   - text: Your <code>style</code> declaration should end with a <code>;</code> .
-    testString: 'assert(code.match(/<h2\s+style\s*=\s*(\"|")\s*color\s*:\s*(?:rgb\(\s*255\s*,\s*0\s*,\s*0\s*\)|rgb\(\s*100%\s*,\s*0%\s*,\s*0%\s*\)|red|#ff0000|#f00|hsl\(\s*0\s*,\s*100%\s*,\s*50%\s*\))\s*\;(\"|")>\s*CatPhotoApp\s*<\/h2>/)," Your <code>style</code> declaration should end with a <code>;</code> .");'
+    testString: assert(code.match(/<h2\s+style\s*=\s*(\'|")\s*color\s*:\s*(?:rgb\(\s*255\s*,\s*0\s*,\s*0\s*\)|rgb\(\s*100%\s*,\s*0%\s*,\s*0%\s*\)|red|#ff0000|#f00|hsl\(\s*0\s*,\s*100%\s*,\s*50%\s*\))\s*\;(\'|")>\s*CatPhotoApp\s*<\/h2>/),' Your <code>style</code> declaration should end with a <code>;</code> .');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md
index 67edcb707c..b2778c56df 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/change-the-font-size-of-an-element.english.md
@@ -21,8 +21,8 @@ Inside the same <code>&#60;style&#62;</code> tag that contains your <code>red-te
 
 ```yml
 tests:
-  - text: 'Between the <code>style</code> tags, give the <code>p</code> elements <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.'
-    testString: 'assert(code.match(/p\s*{\s*font-size\s*:\s*16\s*px\s*;\s*}/i), "Between the <code>style</code> tags, give the <code>p</code> elements <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.");'
+  - text: Between the <code>style</code> tags, give the <code>p</code> elements <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.
+    testString: assert(code.match(/p\s*{\s*font-size\s*:\s*16\s*px\s*;\s*}/i), 'Between the <code>style</code> tags, give the <code>p</code> elements <code>font-size</code> of <code>16px</code>. Browser and Text zoom should be at 100%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/create-a-custom-css-variable.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/create-a-custom-css-variable.english.md
index 7d969e051c..45216c8a64 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/create-a-custom-css-variable.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/create-a-custom-css-variable.english.md
@@ -24,7 +24,7 @@ In the <code>penguin</code> class, create a variable name <code>--penguin-skin</
 ```yml
 tests:
   - text: <code>penguin</code> class should declare the <code>--penguin-skin</code> variable and assign it to <code>gray</code>.
-    testString: 'assert(code.match(/.penguin\s*?{[\s\S]*--penguin-skin\s*?:\s*?gray\s*?;[\s\S]*}/gi), "<code>penguin</code> class should declare the <code>--penguin-skin</code> variable and assign it to <code>gray</code>.");'
+    testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-skin\s*?:\s*?gray\s*?;[\s\S]*}/gi), '<code>penguin</code> class should declare the <code>--penguin-skin</code> variable and assign it to <code>gray</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md
index 1431ba1467..48611b9fa0 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/give-a-background-color-to-a-div-element.english.md
@@ -23,11 +23,11 @@ Create a class called <code>silver-background</code> with the <code>background-c
 ```yml
 tests:
   - text: Give your <code>div</code> element the class <code>silver-background</code>.
-    testString: 'assert($("div").hasClass("silver-background"), "Give your <code>div</code> element the class <code>silver-background</code>.");'
+    testString: assert($("div").hasClass("silver-background"), 'Give your <code>div</code> element the class <code>silver-background</code>.');
   - text: Your <code>div</code> element should have a silver background.
-    testString: 'assert($("div").css("background-color") === "rgb(192, 192, 192)", "Your <code>div</code> element should have a silver background.");'
+    testString: assert($("div").css("background-color") === "rgb(192, 192, 192)", 'Your <code>div</code> element should have a silver background.');
   - text: Define a class named <code>silver-background</code> within the <code>style</code> element and assign the value of <code>silver</code> to the <code>background-color</code> property.
-    testString: 'assert(code.match(/\.silver-background\s*{\s*background-color:\s*silver;\s*}/), "Define a class named <code>silver-background</code> within the <code>style</code> element and assign the value of <code>silver</code> to the <code>background-color</code> property.");'
+    testString: assert(code.match(/\.silver-background\s*{\s*background-color:\s*silver;\s*}/), "Define a class named <code>silver-background</code> within the <code>style</code> element and assign the value of <code>silver</code> to the <code>background-color</code> property.");
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md
index 36fdedbd93..ea1922229d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/import-a-google-font.english.md
@@ -28,13 +28,13 @@ Create a <code>font-family</code> CSS rule that uses the <code>Lobster</code> fo
 ```yml
 tests:
   - text: Import the <code>Lobster</code> font.
-    testString: 'assert(new RegExp("googleapis", "gi").test(code), "Import the <code>Lobster</code> font.");'
+    testString: assert(new RegExp("googleapis", "gi").test(code), 'Import the <code>Lobster</code> font.');
   - text: Your <code>h2</code> element should use the font <code>Lobster</code>.
-    testString: 'assert($("h2").css("font-family").match(/lobster/i), "Your <code>h2</code> element should use the font <code>Lobster</code>.");'
+    testString: assert($("h2").css("font-family").match(/lobster/i), 'Your <code>h2</code> element should use the font <code>Lobster</code>.');
   - text: Use an <code>h2</code> CSS selector to change the font.
-    testString: 'assert(/\s*h2\s*\{\s*font-family\:\s*(\"|")?Lobster(\"|")?\s*;\s*\}/gi.test(code), "Use an <code>h2</code> CSS selector to change the font.");'
+    testString: assert(/\s*h2\s*\{\s*font-family\:\s*(\'|")?Lobster(\'|")?\s*;\s*\}/gi.test(code), 'Use an <code>h2</code> CSS selector to change the font.');
   - text: Your <code>p</code> element should still use the font <code>monospace</code>.
-    testString: 'assert($("p").css("font-family").match(/monospace/i), "Your <code>p</code> element should still use the font <code>monospace</code>.");'
+    testString: assert($("p").css("font-family").match(/monospace/i), 'Your <code>p</code> element should still use the font <code>monospace</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks.english.md
index a90e254f7c..e08bc07cdd 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/improve-compatibility-with-browser-fallbacks.english.md
@@ -23,7 +23,7 @@ It looks like a variable is being used to set the background color of the <code>
 ```yml
 tests:
   - text: Your <code>.red-box</code> rule should include a fallback with the <code>background</code> set to red immediately before the existing <code>background</code> declaration.
-    testString: 'assert(code.match(/.red-box\s*{[^}]*background:\s*(red|#ff0000|#f00|rgb\(\s*255\s*,\s*0\s*,\s*0\s*\)|rgb\(\s*100%\s*,\s*0%\s*,\s*0%\s*\)|hsl\(\s*0\s*,\s*100%\s*,\s*50%\s*\))\s*;\s*background:\s*var\(\s*--red-color\s*\);/gi), "Your <code>.red-box</code> rule should include a fallback with the <code>background</code> set to red immediately before the existing <code>background</code> declaration.");'
+    testString: assert(code.match(/.red-box\s*{[^}]*background:\s*(red|#ff0000|#f00|rgb\(\s*255\s*,\s*0\s*,\s*0\s*\)|rgb\(\s*100%\s*,\s*0%\s*,\s*0%\s*\)|hsl\(\s*0\s*,\s*100%\s*,\s*50%\s*\))\s*;\s*background:\s*var\(\s*--red-color\s*\);/gi), 'Your <code>.red-box</code> rule should include a fallback with the <code>background</code> set to red immediately before the existing <code>background</code> declaration.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/inherit-styles-from-the-body-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/inherit-styles-from-the-body-element.english.md
index d768210702..cc9c6fe63e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/inherit-styles-from-the-body-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/inherit-styles-from-the-body-element.english.md
@@ -24,19 +24,19 @@ Finally, give your <code>body</code> element the font-family of <code>monospace<
 ```yml
 tests:
   - text: Create an <code>h1</code> element.
-    testString: 'assert(($("h1").length > 0), "Create an <code>h1</code> element.");'
+    testString: assert(($("h1").length > 0), 'Create an <code>h1</code> element.');
   - text: Your <code>h1</code> element should have the text <code>Hello World</code>.
-    testString: 'assert(($("h1").length > 0 && $("h1").text().match(/hello world/i)), "Your <code>h1</code> element should have the text <code>Hello World</code>.");'
+    testString: assert(($("h1").length > 0 && $("h1").text().match(/hello world/i)), 'Your <code>h1</code> element should have the text <code>Hello World</code>.');
   - text: Make sure your <code>h1</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/h1>/g) && code.match(/<h1/g) && code.match(/<\/h1>/g).length === code.match(/<h1/g).length, "Make sure your <code>h1</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/h1>/g) && code.match(/<h1/g) && code.match(/<\/h1>/g).length === code.match(/<h1/g).length, 'Make sure your <code>h1</code> element has a closing tag.');
   - text: Give your <code>body</code> element the <code>color</code> property of <code>green</code>.
-    testString: 'assert(($("body").css("color") === "rgb(0, 128, 0)"), "Give your <code>body</code> element the <code>color</code> property of <code>green</code>.");'
+    testString: assert(($("body").css("color") === "rgb(0, 128, 0)"), 'Give your <code>body</code> element the <code>color</code> property of <code>green</code>.');
   - text: Give your <code>body</code> element the <code>font-family</code> property of <code>monospace</code>.
-    testString: 'assert(($("body").css("font-family").match(/monospace/i)), "Give your <code>body</code> element the <code>font-family</code> property of <code>monospace</code>.");'
+    testString: assert(($("body").css("font-family").match(/monospace/i)), 'Give your <code>body</code> element the <code>font-family</code> property of <code>monospace</code>.');
   - text: Your <code>h1</code> element should inherit the font <code>monospace</code> from your <code>body</code> element.
-    testString: 'assert(($("h1").length > 0 && $("h1").css("font-family").match(/monospace/i)), "Your <code>h1</code> element should inherit the font <code>monospace</code> from your <code>body</code> element.");'
+    testString: assert(($("h1").length > 0 && $("h1").css("font-family").match(/monospace/i)), 'Your <code>h1</code> element should inherit the font <code>monospace</code> from your <code>body</code> element.');
   - text: Your <code>h1</code> element should inherit the color green from your <code>body</code> element.
-    testString: 'assert(($("h1").length > 0 && $("h1").css("color") === "rgb(0, 128, 0)"), "Your <code>h1</code> element should inherit the color green from your <code>body</code> element.");'
+    testString: assert(($("h1").length > 0 && $("h1").css("color") === "rgb(0, 128, 0)"), 'Your <code>h1</code> element should inherit the color green from your <code>body</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md
index 49083f40fc..208a20b0fc 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/make-circular-images-with-a-border-radius.english.md
@@ -20,10 +20,10 @@ Give your cat photo a <code>border-radius</code> of <code>50%</code>.
 
 ```yml
 tests:
-  - text: 'Your image should have a border radius of <code>50%</code>, making it perfectly circular.'
-    testString: 'assert(parseInt($("img").css("border-top-left-radius")) > 48, "Your image should have a border radius of <code>50%</code>, making it perfectly circular.");'
+  - text: Your image should have a border radius of <code>50%</code>, making it perfectly circular.
+    testString: assert(parseInt($("img").css("border-top-left-radius")) > 48, 'Your image should have a border radius of <code>50%</code>, making it perfectly circular.');
   - text: Be sure to use a percentage value of <code>50%</code>.
-    testString: 'assert(code.match(/50%/g), "Be sure to use a percentage value of <code>50%</code>.");'
+    testString: assert(code.match(/50%/g), 'Be sure to use a percentage value of <code>50%</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-all-other-styles-by-using-important.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-all-other-styles-by-using-important.english.md
index 28b132d935..dd80833712 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-all-other-styles-by-using-important.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-all-other-styles-by-using-important.english.md
@@ -26,17 +26,17 @@ An example of how to do this is:
 ```yml
 tests:
   - text: Your <code>h1</code> element should have the class <code>pink-text</code>.
-    testString: 'assert($("h1").hasClass("pink-text"), "Your <code>h1</code> element should have the class <code>pink-text</code>.");'
+    testString: assert($("h1").hasClass("pink-text"), 'Your <code>h1</code> element should have the class <code>pink-text</code>.');
   - text: Your <code>h1</code> element should have the class <code>blue-text</code>.
-    testString: 'assert($("h1").hasClass("blue-text"), "Your <code>h1</code> element should have the class <code>blue-text</code>.");'
+    testString: assert($("h1").hasClass("blue-text"), 'Your <code>h1</code> element should have the class <code>blue-text</code>.');
   - text: Your <code>h1</code> element should have the id of <code>orange-text</code>.
-    testString: 'assert($("h1").attr("id") === "orange-text", "Your <code>h1</code> element should have the id of <code>orange-text</code>.");'
-  - text: 'Your <code>h1</code> element should have the inline style of <code>color&#58; white</code>.'
-    testString: 'assert(code.match(/<h1.*style/gi) && code.match(/<h1.*style.*color\s*?:/gi), "Your <code>h1</code> element should have the inline style of <code>color&#58; white</code>.");'
+    testString: assert($("h1").attr("id") === "orange-text", 'Your <code>h1</code> element should have the id of <code>orange-text</code>.');
+  - text: Your <code>h1</code> element should have the inline style of <code>color&#58; white</code>.
+    testString: assert(code.match(/<h1.*style/gi) && code.match(/<h1.*style.*color\s*?:/gi), 'Your <code>h1</code> element should have the inline style of <code>color&#58; white</code>.');
   - text: Your <code>pink-text</code> class declaration should have the <code>!important</code> keyword to override all other declarations.
-    testString: 'assert(code.match(/\.pink-text\s*?\{[\s\S]*?color:.*pink.*!important\s*;?[^\.]*\}/g), "Your <code>pink-text</code> class declaration should have the <code>!important</code> keyword to override all other declarations.");'
+    testString: assert(code.match(/\.pink-text\s*?\{[\s\S]*?color:.*pink.*!important\s*;?[^\.]*\}/g), 'Your <code>pink-text</code> class declaration should have the <code>!important</code> keyword to override all other declarations.');
   - text: Your <code>h1</code> element should be pink.
-    testString: 'assert($("h1").css("color") === "rgb(255, 192, 203)", "Your <code>h1</code> element should be pink.");'
+    testString: assert($("h1").css("color") === "rgb(255, 192, 203)", 'Your <code>h1</code> element should be pink.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-by-styling-id-attributes.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-by-styling-id-attributes.english.md
index 0b6104d113..8ac55ece91 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-by-styling-id-attributes.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-by-styling-id-attributes.english.md
@@ -28,19 +28,19 @@ Note: It doesn't matter whether you declare this CSS above or below pink-text cl
 ```yml
 tests:
   - text: Your <code>h1</code> element should have the class <code>pink-text</code>.
-    testString: 'assert($("h1").hasClass("pink-text"), "Your <code>h1</code> element should have the class <code>pink-text</code>.");'
+    testString: assert($("h1").hasClass("pink-text"), 'Your <code>h1</code> element should have the class <code>pink-text</code>.');
   - text: Your <code>h1</code> element should have the class <code>blue-text</code>.
-    testString: 'assert($("h1").hasClass("blue-text"), "Your <code>h1</code> element should have the class <code>blue-text</code>.");'
+    testString: assert($("h1").hasClass("blue-text"), 'Your <code>h1</code> element should have the class <code>blue-text</code>.');
   - text: Give your <code>h1</code> element the id of <code>orange-text</code>.
-    testString: 'assert($("h1").attr("id") === "orange-text", "Give your <code>h1</code> element the id of <code>orange-text</code>.");'
+    testString: assert($("h1").attr("id") === "orange-text", 'Give your <code>h1</code> element the id of <code>orange-text</code>.');
   - text: There should be only one <code>h1</code> element.
-    testString: 'assert(($("h1").length === 1), "There should be only one <code>h1</code> element.");'
+    testString: assert(($("h1").length === 1), 'There should be only one <code>h1</code> element.');
   - text: Create a CSS declaration for your <code>orange-text</code> id
-    testString: 'assert(code.match(/#orange-text\s*{/gi), "Create a CSS declaration for your <code>orange-text</code> id");'
+    testString: assert(code.match(/#orange-text\s*{/gi), 'Create a CSS declaration for your <code>orange-text</code> id');
   - text: Do not give your <code>h1</code> any <code>style</code> attributes.
-    testString: 'assert(!code.match(/<h1.*style.*>/gi), "Do not give your <code>h1</code> any <code>style</code> attributes.");'
+    testString: assert(!code.match(/<h1.*style.*>/gi), 'Do not give your <code>h1</code> any <code>style</code> attributes.');
   - text: Your <code>h1</code> element should be orange.
-    testString: 'assert($("h1").css("color") === "rgb(255, 165, 0)", "Your <code>h1</code> element should be orange.");'
+    testString: assert($("h1").css("color") === "rgb(255, 165, 0)", 'Your <code>h1</code> element should be orange.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-with-inline-styles.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-with-inline-styles.english.md
index 1109de09ad..5077e8e8cd 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-with-inline-styles.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-class-declarations-with-inline-styles.english.md
@@ -24,15 +24,15 @@ Leave the <code>blue-text</code> and <code>pink-text</code> classes on your <cod
 ```yml
 tests:
   - text: Your <code>h1</code> element should have the class <code>pink-text</code>.
-    testString: 'assert($("h1").hasClass("pink-text"), "Your <code>h1</code> element should have the class <code>pink-text</code>.");'
+    testString: assert($("h1").hasClass("pink-text"), 'Your <code>h1</code> element should have the class <code>pink-text</code>.');
   - text: Your <code>h1</code> element should have the class <code>blue-text</code>.
-    testString: 'assert($("h1").hasClass("blue-text"), "Your <code>h1</code> element should have the class <code>blue-text</code>.");'
+    testString: assert($("h1").hasClass("blue-text"), 'Your <code>h1</code> element should have the class <code>blue-text</code>.');
   - text: Your <code>h1</code> element should have the id of <code>orange-text</code>.
-    testString: 'assert($("h1").attr("id") === "orange-text", "Your <code>h1</code> element should have the id of <code>orange-text</code>.");'
+    testString: assert($("h1").attr("id") === "orange-text", 'Your <code>h1</code> element should have the id of <code>orange-text</code>.');
   - text: Give your <code>h1</code> element an inline style.
-    testString: 'assert(document.querySelector("h1[style]"), "Give your <code>h1</code> element an inline style.");'
+    testString: assert(document.querySelector('h1[style]'), 'Give your <code>h1</code> element an inline style.');
   - text: Your <code>h1</code> element should be white.
-    testString: 'assert($("h1").css("color") === "rgb(255, 255, 255)", "Your <code>h1</code> element should be white.");'
+    testString: assert($("h1").css("color") === "rgb(255, 255, 255)", 'Your <code>h1</code> element should be white.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-styles-in-subsequent-css.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-styles-in-subsequent-css.english.md
index 728abe040b..de9926cdb4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/override-styles-in-subsequent-css.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/override-styles-in-subsequent-css.english.md
@@ -27,13 +27,13 @@ However, the order of the <code>class</code> declarations in the <code>&#60;styl
 ```yml
 tests:
   - text: Your <code>h1</code> element should have the class <code>pink-text</code>.
-    testString: 'assert($("h1").hasClass("pink-text"), "Your <code>h1</code> element should have the class <code>pink-text</code>.");'
+    testString: assert($("h1").hasClass("pink-text"), 'Your <code>h1</code> element should have the class <code>pink-text</code>.');
   - text: Your <code>h1</code> element should have the class <code>blue-text</code>.
-    testString: 'assert($("h1").hasClass("blue-text"), "Your <code>h1</code> element should have the class <code>blue-text</code>.");'
+    testString: assert($("h1").hasClass("blue-text"), 'Your <code>h1</code> element should have the class <code>blue-text</code>.');
   - text: Both <code>blue-text</code> and <code>pink-text</code> should belong to the same <code>h1</code> element.
-    testString: 'assert($(".pink-text").hasClass("blue-text"), "Both <code>blue-text</code> and <code>pink-text</code> should belong to the same <code>h1</code> element.");'
+    testString: assert($(".pink-text").hasClass("blue-text"), 'Both <code>blue-text</code> and <code>pink-text</code> should belong to the same <code>h1</code> element.');
   - text: Your <code>h1</code> element should be blue.
-    testString: 'assert($("h1").css("color") === "rgb(0, 0, 255)", "Your <code>h1</code> element should be blue.");'
+    testString: assert($("h1").css("color") === "rgb(0, 0, 255)", 'Your <code>h1</code> element should be blue.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/prioritize-one-style-over-another.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/prioritize-one-style-over-another.english.md
index 9f1e1d1607..9044a22d67 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/prioritize-one-style-over-another.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/prioritize-one-style-over-another.english.md
@@ -24,11 +24,11 @@ Give your <code>h1</code> element the class of <code>pink-text</code>.
 ```yml
 tests:
   - text: Your <code>h1</code> element should have the class <code>pink-text</code>.
-    testString: 'assert($("h1").hasClass("pink-text"), "Your <code>h1</code> element should have the class <code>pink-text</code>.");'
-  - text: 'Your <code>&#60;style&#62;</code> should have a <code>pink-text</code> CSS class that changes the <code>color</code>.'
-    testString: 'assert(code.match(/\.pink-text\s*\{\s*color\s*:\s*.+\s*;\s*\}/g), "Your <code>&#60;style&#62;</code> should have a <code>pink-text</code> CSS class that changes the <code>color</code>.");'
+    testString: assert($("h1").hasClass("pink-text"), 'Your <code>h1</code> element should have the class <code>pink-text</code>.');
+  - text: Your <code>&#60;style&#62;</code> should have a <code>pink-text</code> CSS class that changes the <code>color</code>.
+    testString: assert(code.match(/\.pink-text\s*\{\s*color\s*:\s*.+\s*;\s*\}/g), 'Your <code>&#60;style&#62;</code> should have a <code>pink-text</code> CSS class that changes the <code>color</code>.');
   - text: Your <code>h1</code> element should be pink.
-    testString: 'assert($("h1").css("color") === "rgb(255, 192, 203)", "Your <code>h1</code> element should be pink.");'
+    testString: assert($("h1").css("color") === "rgb(255, 192, 203)", 'Your <code>h1</code> element should be pink.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md
index 82fd5e52a5..36d061ddda 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-font-family-of-an-element.english.md
@@ -23,7 +23,7 @@ Make all of your <code>p</code> elements use the <code>monospace</code> font.
 ```yml
 tests:
   - text: Your <code>p</code> elements should use the font <code>monospace</code>.
-    testString: 'assert($("p").not(".red-text").css("font-family").match(/monospace/i), "Your <code>p</code> elements should use the font <code>monospace</code>.");'
+    testString: assert($("p").not(".red-text").css("font-family").match(/monospace/i), 'Your <code>p</code> elements should use the font <code>monospace</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md
index 4d3c595dd1..0c0c738332 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/set-the-id-of-an-element.english.md
@@ -25,7 +25,7 @@ Give your <code>form</code> element the id <code>cat-photo-form</code>.
 ```yml
 tests:
   - text: Give your <code>form</code> element the id of <code>cat-photo-form</code>.
-    testString: 'assert($("form").attr("id") === "cat-photo-form", "Give your <code>form</code> element the id of <code>cat-photo-form</code>.");'
+    testString: assert($("form").attr("id") === "cat-photo-form", 'Give your <code>form</code> element the id of <code>cat-photo-form</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md
index 58b8a7bc1d..565f19bb30 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/size-your-images.english.md
@@ -24,9 +24,9 @@ Create a class called <code>smaller-image</code> and use it to resize the image
 ```yml
 tests:
   - text: Your <code>img</code> element should have the class <code>smaller-image</code>.
-    testString: 'assert($("img[src="https://bit.ly/fcc-relaxing-cat"]").attr("class") === "smaller-image", "Your <code>img</code> element should have the class <code>smaller-image</code>.");'
+    testString: assert($("img[src='https://bit.ly/fcc-relaxing-cat']").attr('class') === "smaller-image", 'Your <code>img</code> element should have the class <code>smaller-image</code>.');
   - text: Your image should be 100 pixels wide. Browser zoom should be at 100%.
-    testString: 'assert($("img").width() === 100, "Your image should be 100 pixels wide. Browser zoom should be at 100%.");'
+    testString: assert($("img").width() === 100, 'Your image should be 100 pixels wide. Browser zoom should be at 100%.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md
index 61aaf397ab..2a33666ed8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/specify-how-fonts-should-degrade.english.md
@@ -27,13 +27,13 @@ In the last challenge, you imported the <code>Lobster</code> font using the <cod
 ```yml
 tests:
   - text: Your h2 element should use the font <code>Lobster</code>.
-    testString: 'assert($("h2").css("font-family").match(/^"?lobster/i), "Your h2 element should use the font <code>Lobster</code>.");'
+    testString: assert($("h2").css("font-family").match(/^"?lobster/i), 'Your h2 element should use the font <code>Lobster</code>.');
   - text: Your h2 element should degrade to the font <code>monospace</code> when <code>Lobster</code> is not available.
-    testString: 'assert(/\s*h2\s*\{\s*font-family\:\s*(\"|")?Lobster(\"|")?,\s*monospace\s*;\s*\}/gi.test(code), "Your h2 element should degrade to the font <code>monospace</code> when <code>Lobster</code> is not available.");'
-  - text: 'Comment out your call to Google for the <code>Lobster</code> font by putting <code>&#60;!--</code> in front of it.'
-    testString: 'assert(new RegExp("<!--[^fc]", "gi").test(code), "Comment out your call to Google for the <code>Lobster</code> font by putting <code>&#60;!--</code> in front of it.");'
-  - text: 'Be sure to close your comment by adding <code>--&#62;</code>.'
-    testString: 'assert(new RegExp("[^fc]-->", "gi").test(code), "Be sure to close your comment by adding <code>--&#62;</code>.");'
+    testString: assert(/\s*h2\s*\{\s*font-family\:\s*(\'|")?Lobster(\'|")?,\s*monospace\s*;\s*\}/gi.test(code), 'Your h2 element should degrade to the font <code>monospace</code> when <code>Lobster</code> is not available.');
+  - text: Comment out your call to Google for the <code>Lobster</code> font by putting <code>&#60!--</code> in front of it.
+    testString: assert(new RegExp("<!--[^fc]", "gi").test(code), 'Comment out your call to Google for the <code>Lobster</code> font by putting <code>&#60;!--</code> in front of it.');
+  - text: Be sure to close your comment by adding <code>--&#62;!</code>.
+    testString: assert(new RegExp("[^fc]-->", "gi").test(code), 'Be sure to close your comment by adding <code>--&#62;!</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md
index 9849e5059f..a1433e898f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/style-multiple-elements-with-a-css-class.english.md
@@ -21,15 +21,15 @@ Classes allow you to use the same CSS styles on multiple HTML elements. You can
 ```yml
 tests:
   - text: Your <code>h2</code> element should be red.
-    testString: 'assert($("h2").css("color") === "rgb(255, 0, 0)", "Your <code>h2</code> element should be red.");'
+    testString: assert($("h2").css("color") === "rgb(255, 0, 0)", 'Your <code>h2</code> element should be red.');
   - text: Your <code>h2</code> element should have the class <code>red-text</code>.
-    testString: 'assert($("h2").hasClass("red-text"), "Your <code>h2</code> element should have the class <code>red-text</code>.");'
+    testString: assert($("h2").hasClass("red-text"), 'Your <code>h2</code> element should have the class <code>red-text</code>.');
   - text: Your first <code>p</code> element should be red.
-    testString: 'assert($("p:eq(0)").css("color") === "rgb(255, 0, 0)", "Your first <code>p</code> element should be red.");'
+    testString: assert($("p:eq(0)").css("color") === "rgb(255, 0, 0)", 'Your first <code>p</code> element should be red.');
   - text: Your second and third <code>p</code> elements should not be red.
-    testString: 'assert(!($("p:eq(1)").css("color") === "rgb(255, 0, 0)") && !($("p:eq(2)").css("color") === "rgb(255, 0, 0)"), "Your second and third <code>p</code> elements should not be red.");'
+    testString: assert(!($("p:eq(1)").css("color") === "rgb(255, 0, 0)") && !($("p:eq(2)").css("color") === "rgb(255, 0, 0)"), 'Your second and third <code>p</code> elements should not be red.');
   - text: Your first <code>p</code> element should have the class <code>red-text</code>.
-    testString: 'assert($("p:eq(0)").hasClass("red-text"), "Your first <code>p</code> element should have the class <code>red-text</code>.");'
+    testString: assert($("p:eq(0)").hasClass("red-text"), 'Your first <code>p</code> element should have the class <code>red-text</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/style-the-html-body-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/style-the-html-body-element.english.md
index 2dba7d3cc3..7dbd627746 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/style-the-html-body-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/style-the-html-body-element.english.md
@@ -24,11 +24,11 @@ We can do this by adding the following to our <code>style</code> element:
 ```yml
 tests:
   - text: Give your <code>body</code> element the <code>background-color</code> of black.
-    testString: 'assert($("body").css("background-color") === "rgb(0, 0, 0)", "Give your <code>body</code> element the <code>background-color</code> of black.");'
+    testString: assert($("body").css("background-color") === "rgb(0, 0, 0)", 'Give your <code>body</code> element the <code>background-color</code> of black.');
   - text: Make sure your CSS rule is properly formatted with both opening and closing curly brackets.
-    testString: 'assert(code.match(/<style>\s*body\s*\{\s*background.*\s*:\s*.*;\s*\}\s*<\/style>/i), "Make sure your CSS rule is properly formatted with both opening and closing curly brackets.");'
+    testString: assert(code.match(/<style>\s*body\s*\{\s*background.*\s*:\s*.*;\s*\}\s*<\/style>/i), 'Make sure your CSS rule is properly formatted with both opening and closing curly brackets.');
   - text: Make sure your CSS rule ends with a semi-colon.
-    testString: 'assert(code.match(/<style>\s*body\s*\{\s*background.*\s*:\s*.*;\s*\}\s*<\/style>/i), "Make sure your CSS rule ends with a semi-colon.");'
+    testString: assert(code.match(/<style>\s*body\s*\{\s*background.*\s*:\s*.*;\s*\}\s*<\/style>/i), 'Make sure your CSS rule ends with a semi-colon.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/understand-absolute-versus-relative-units.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/understand-absolute-versus-relative-units.english.md
index 980eb44146..37754ce835 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/understand-absolute-versus-relative-units.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/understand-absolute-versus-relative-units.english.md
@@ -24,9 +24,9 @@ Add a <code>padding</code> property to the element with class <code>red-box</cod
 ```yml
 tests:
   - text: Your <code>red-box</code> class should have a <code>padding</code> property.
-    testString: 'assert($(".red-box").css("padding-top") != "0px" && $(".red-box").css("padding-right") != "0px" && $(".red-box").css("padding-bottom") != "0px" && $(".red-box").css("padding-left") != "0px", "Your <code>red-box</code> class should have a <code>padding</code> property.");'
+    testString: assert($('.red-box').css('padding-top') != '0px' && $('.red-box').css('padding-right') != '0px' && $('.red-box').css('padding-bottom') != '0px' && $('.red-box').css('padding-left') != '0px', 'Your <code>red-box</code> class should have a <code>padding</code> property.');
   - text: Your <code>red-box</code> class should give elements 1.5em of <code>padding</code>.
-    testString: 'assert(code.match(/\.red-box\s*?{\s*?.*?\s*?.*?\s*?padding:\s*?1\.5em/gi), "Your <code>red-box</code> class should give elements 1.5em of <code>padding</code>.");'
+    testString: assert(code.match(/\.red-box\s*?{\s*?.*?\s*?.*?\s*?padding:\s*?1\.5em/gi), 'Your <code>red-box</code> class should give elements 1.5em of <code>padding</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md
index 8a324189ea..93e2c5a5b9 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-css-class-to-style-an-element.english.md
@@ -28,13 +28,13 @@ Give your <code>h2</code> element the <code>class</code> attribute with a value
 ```yml
 tests:
   - text: Your <code>h2</code> element should be red.
-    testString: 'assert($("h2").css("color") === "rgb(255, 0, 0)", "Your <code>h2</code> element should be red.");'
+    testString: assert($("h2").css("color") === "rgb(255, 0, 0)", 'Your <code>h2</code> element should be red.');
   - text: Your <code>h2</code> element should have the class <code>red-text</code>.
-    testString: 'assert($("h2").hasClass("red-text"), "Your <code>h2</code> element should have the class <code>red-text</code>.");'
+    testString: assert($("h2").hasClass("red-text"), 'Your <code>h2</code> element should have the class <code>red-text</code>.');
   - text: Your stylesheet should declare a <code>red-text</code> class and have its color set to red.
-    testString: 'assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g), "Your stylesheet should declare a <code>red-text</code> class and have its color set to red.");'
-  - text: 'Do not use inline style declarations like <code>style="color&#58; red"</code> in your <code>h2</code> element.'
-    testString: 'assert($("h2").attr("style") === undefined, "Do not use inline style declarations like <code>style="color&#58; red"</code> in your <code>h2</code> element.");'
+    testString: assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g), 'Your stylesheet should declare a <code>red-text</code> class and have its color set to red.');
+  - text: Do not use inline style declarations like <code>style="color&#58; red"</code> in your <code>h2</code> element.
+    testString: assert($("h2").attr("style") === undefined, 'Do not use inline style declarations like <code>style="color&#58; red"</code> in your <code>h2</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-custom-css-variable.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-custom-css-variable.english.md
index b822c1c716..ea8d3a5c26 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-custom-css-variable.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-custom-css-variable.english.md
@@ -24,13 +24,13 @@ Apply the <code>--penguin-skin</code> variable to the <code>background</code> pr
 ```yml
 tests:
   - text: Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>penguin-top</code> class.
-    testString: 'assert(code.match(/.penguin-top\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}[\s\S]*.penguin-bottom\s{/gi), "Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>penguin-top</code> class.");'
+    testString: assert(code.match(/.penguin-top\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}[\s\S]*.penguin-bottom\s{/gi), 'Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>penguin-top</code> class.');
   - text: Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>penguin-bottom</code> class.
-    testString: 'assert(code.match(/.penguin-bottom\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}[\s\S]*.right-hand\s{/gi), "Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>penguin-bottom</code> class.");'
+    testString: assert(code.match(/.penguin-bottom\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}[\s\S]*.right-hand\s{/gi), 'Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>penguin-bottom</code> class.');
   - text: Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>right-hand</code> class.
-    testString: 'assert(code.match(/.right-hand\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}[\s\S]*.left-hand\s{/gi), "Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>right-hand</code> class.");'
+    testString: assert(code.match(/.right-hand\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}[\s\S]*.left-hand\s{/gi), 'Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>right-hand</code> class.');
   - text: Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>left-hand</code> class.
-    testString: 'assert(code.match(/.left-hand\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}/gi), "Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>left-hand</code> class.");'
+    testString: assert(code.match(/.left-hand\s*?{[\s\S]*background\s*?:\s*?var\s*?\(\s*?--penguin-skin\s*?\)\s*?;[\s\S]*}/gi), 'Apply the <code>--penguin-skin</code> variable to the <code>background</code> property of the <code>left-hand</code> class.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-media-query-to-change-a-variable.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-media-query-to-change-a-variable.english.md
index 0cf18161f9..12bdce6779 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-media-query-to-change-a-variable.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-a-media-query-to-change-a-variable.english.md
@@ -21,10 +21,10 @@ In the <code>:root</code> selector of the <code>media query</code>, change it so
 
 ```yml
 tests:
-  - text: '<code>:root</code> should reassign the <code>--penguin-size</code> variable to <code>200px</code>.'
-    testString: 'assert(code.match(/media\s*?\(\s*?max-width\s*?:\s*?350px\s*?\)\s*?{[\s\S]*:root\s*?{[\s\S]*--penguin-size\s*?:\s*?200px\s*?;[\s\S]*}[\s\S]*}/gi), "<code>:root</code> should reassign the <code>--penguin-size</code> variable to <code>200px</code>.");'
-  - text: '<code>:root</code> should reassign the <code>--penguin-skin</code> variable to <code>black</code>.'
-    testString: 'assert(code.match(/media\s*?\(\s*?max-width\s*?:\s*?350px\s*?\)\s*?{[\s\S]*:root\s*?{[\s\S]*--penguin-skin\s*?:\s*?black\s*?;[\s\S]*}[\s\S]*}/gi), "<code>:root</code> should reassign the <code>--penguin-skin</code> variable to <code>black</code>.");'
+  - text: <code>:root</code> should reassign the <code>--penguin-size</code> variable to <code>200px</code>.
+    testString: assert(code.match(/media\s*?\(\s*?max-width\s*?:\s*?350px\s*?\)\s*?{[\s\S]*:root\s*?{[\s\S]*--penguin-size\s*?:\s*?200px\s*?;[\s\S]*}[\s\S]*}/gi), '<code>:root</code> should reassign the <code>--penguin-size</code> variable to <code>200px</code>.');
+  - text: <code>:root</code> should reassign the <code>--penguin-skin</code> variable to <code>black</code>.
+    testString: assert(code.match(/media\s*?\(\s*?max-width\s*?:\s*?350px\s*?\)\s*?{[\s\S]*:root\s*?{[\s\S]*--penguin-skin\s*?:\s*?black\s*?;[\s\S]*}[\s\S]*}/gi), '<code>:root</code> should reassign the <code>--penguin-skin</code> variable to <code>black</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-abbreviated-hex-code.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-abbreviated-hex-code.english.md
index 987fb35f4f..2117068496 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-abbreviated-hex-code.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-abbreviated-hex-code.english.md
@@ -24,21 +24,21 @@ Go ahead, try using the abbreviated hex codes to color the correct elements.
 ```yml
 tests:
   - text: Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.
-    testString: 'assert($(".red-text").css("color") === "rgb(255, 0, 0)", "Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.");'
-  - text: 'Use the abbreviate <code>hex code</code> for the color red instead of the hex code <code>#FF0000</code>.'
-    testString: 'assert(code.match(/\.red-text\s*?{\s*?color:\s*?#F00\s*?;\s*?}/gi), "Use the abbreviate <code>hex code</code> for the color red instead of the hex code <code>#FF0000</code>.");'
+    testString: assert($('.red-text').css('color') === 'rgb(255, 0, 0)', 'Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.');
+  - text: Use the abbreviate <code>hex code</code> for the color red instead of the hex code <code>#FF0000</code>.
+    testString: assert(code.match(/\.red-text\s*?{\s*?color:\s*?#F00\s*?;\s*?}/gi), 'Use the abbreviate <code>hex code</code> for the color red instead of the hex code <code>#FF0000</code>.');
   - text: Give your <code>h1</code> element with the text <code>I am green!</code> the <code>color</code> green.
-    testString: 'assert($(".green-text").css("color") === "rgb(0, 255, 0)", "Give your <code>h1</code> element with the text <code>I am green!</code> the <code>color</code> green.");'
-  - text: 'Use the abbreviated <code>hex code</code> for the color green instead of the hex code <code>#00FF00</code>.'
-    testString: 'assert(code.match(/\.green-text\s*?{\s*?color:\s*?#0F0\s*?;\s*?}/gi), "Use the abbreviated <code>hex code</code> for the color green instead of the hex code <code>#00FF00</code>.");'
+    testString: assert($('.green-text').css('color') === 'rgb(0, 255, 0)', 'Give your <code>h1</code> element with the text <code>I am green!</code> the <code>color</code> green.');
+  - text: Use the abbreviated <code>hex code</code> for the color green instead of the hex code <code>#00FF00</code>.
+    testString: assert(code.match(/\.green-text\s*?{\s*?color:\s*?#0F0\s*?;\s*?}/gi), 'Use the abbreviated <code>hex code</code> for the color green instead of the hex code <code>#00FF00</code>.');
   - text: Give your <code>h1</code> element with the text <code>I am cyan!</code> the <code>color</code> cyan.
-    testString: 'assert($(".cyan-text").css("color") === "rgb(0, 255, 255)", "Give your <code>h1</code> element with the text <code>I am cyan!</code> the <code>color</code> cyan.");'
-  - text: 'Use the abbreviated <code>hex code</code> for the color cyan instead of the hex code <code>#00FFFF</code>.'
-    testString: 'assert(code.match(/\.cyan-text\s*?{\s*?color:\s*?#0FF\s*?;\s*?}/gi), "Use the abbreviated <code>hex code</code> for the color cyan instead of the hex code <code>#00FFFF</code>.");'
+    testString: assert($('.cyan-text').css('color') === 'rgb(0, 255, 255)', 'Give your <code>h1</code> element with the text <code>I am cyan!</code> the <code>color</code> cyan.');
+  - text: Use the abbreviated <code>hex code</code> for the color cyan instead of the hex code <code>#00FFFF</code>.
+    testString: assert(code.match(/\.cyan-text\s*?{\s*?color:\s*?#0FF\s*?;\s*?}/gi), 'Use the abbreviated <code>hex code</code> for the color cyan instead of the hex code <code>#00FFFF</code>.');
   - text: Give your <code>h1</code> element with the text <code>I am fuchsia!</code> the <code>color</code> fuchsia.
-    testString: 'assert($(".fuchsia-text").css("color") === "rgb(255, 0, 255)", "Give your <code>h1</code> element with the text <code>I am fuchsia!</code> the <code>color</code> fuchsia.");'
-  - text: 'Use the abbreviated <code>hex code</code> for the color fuchsia instead of the hex code <code>#FF00FF</code>.'
-    testString: 'assert(code.match(/\.fuchsia-text\s*?{\s*?color:\s*?#F0F\s*?;\s*?}/gi), "Use the abbreviated <code>hex code</code> for the color fuchsia instead of the hex code <code>#FF00FF</code>.");'
+    testString: assert($('.fuchsia-text').css('color') === 'rgb(255, 0, 255)', 'Give your <code>h1</code> element with the text <code>I am fuchsia!</code> the <code>color</code> fuchsia.');
+  - text: Use the abbreviated <code>hex code</code> for the color fuchsia instead of the hex code <code>#FF00FF</code>.
+    testString: assert(code.match(/\.fuchsia-text\s*?{\s*?color:\s*?#F0F\s*?;\s*?}/gi), 'Use the abbreviated <code>hex code</code> for the color fuchsia instead of the hex code <code>#FF00FF</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md
index 05a30d638c..7c2f8029df 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-an-id-attribute-to-style-an-element.english.md
@@ -25,13 +25,13 @@ Try giving your form, which now has the <code>id</code> attribute of <code>cat-p
 ```yml
 tests:
   - text: Give your <code>form</code> element the id of <code>cat-photo-form</code>.
-    testString: 'assert($("form").attr("id") === "cat-photo-form", "Give your <code>form</code> element the id of <code>cat-photo-form</code>.");'
+    testString: assert($("form").attr("id") === "cat-photo-form", 'Give your <code>form</code> element the id of <code>cat-photo-form</code>.');
   - text: Your <code>form</code> element should have the <code>background-color</code> of green.
-    testString: 'assert($("#cat-photo-form").css("background-color") === "rgb(0, 128, 0)", "Your <code>form</code> element should have the <code>background-color</code> of green.");'
+    testString: assert($("#cat-photo-form").css("background-color") === "rgb(0, 128, 0)", 'Your <code>form</code> element should have the <code>background-color</code> of green.');
   - text: Make sure your <code>form</code> element has an <code>id</code> attribute.
-    testString: 'assert(code.match(/<form.*cat-photo-form.*>/gi) && code.match(/<form.*cat-photo-form.*>/gi).length > 0, "Make sure your <code>form</code> element has an <code>id</code> attribute.");'
+    testString: assert(code.match(/<form.*cat-photo-form.*>/gi) && code.match(/<form.*cat-photo-form.*>/gi).length > 0, 'Make sure your <code>form</code> element has an <code>id</code> attribute.');
   - text: Do not give your <code>form</code> any <code>class</code> or <code>style</code> attributes.
-    testString: 'assert(!code.match(/<form.*style.*>/gi) && !code.match(/<form.*class.*>/gi), "Do not give your <code>form</code> any <code>class</code> or <code>style</code> attributes.");'
+    testString: assert(!code.match(/<form.*style.*>/gi) && !code.match(/<form.*class.*>/gi), 'Do not give your <code>form</code> any <code>class</code> or <code>style</code> attributes.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md
index 87e8755eb8..72cab06a84 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-attribute-selectors-to-style-elements.english.md
@@ -24,11 +24,11 @@ Using the <code>type</code> attribute selector, try to give the checkboxes in Ca
 ```yml
 tests:
   - text: The <code>type</code> attribute selector should be used to select the checkboxes.
-    testString: 'assert(code.match(/<style>[\s\S]*?\[type=("|")checkbox\1\]\s*?{[\s\S]*?}[\s\S]*?<\/style>/gi),"The <code>type</code> attribute selector should be used to select the checkboxes.");'
+    testString: assert(code.match(/<style>[\s\S]*?\[type=("|')checkbox\1\]\s*?{[\s\S]*?}[\s\S]*?<\/style>/gi),'The <code>type</code> attribute selector should be used to select the checkboxes.');
   - text: The top margins of the checkboxes should be 10px.
-    testString: 'assert((function() {var count=0; $("[type="checkbox"]").each(function() { if($(this).css("marginTop") === "10px") {count++;}});return (count===3)}()),"The top margins of the checkboxes should be 10px.");'
+    testString: assert((function() {var count=0; $("[type='checkbox']").each(function() { if($(this).css('marginTop') === '10px') {count++;}});return (count===3)}()),'The top margins of the checkboxes should be 10px.');
   - text: The bottom margins of the checkboxes should be 15px.
-    testString: 'assert((function() {var count=0; $("[type="checkbox"]").each(function() { if($(this).css("marginBottom") === "15px") {count++;}});return (count===3)}()),"The bottom margins of the checkboxes should be 15px.");'
+    testString: assert((function() {var count=0; $("[type='checkbox']").each(function() { if($(this).css('marginBottom') === '15px') {count++;}});return (count===3)}()),'The bottom margins of the checkboxes should be 15px.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-margin-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-margin-of-an-element.english.md
index e7981ca296..23509dfc1d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-margin-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-margin-of-an-element.english.md
@@ -24,13 +24,13 @@ Use <code>Clockwise Notation</code> to give the element with the <code>blue-box<
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-top") === "40px", "Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-top") === "40px", 'Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>margin</code>.');
   - text: Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-right") === "20px", "Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-right") === "20px", 'Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>margin</code>.');
   - text: Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-bottom") === "20px", "Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-bottom") === "20px", 'Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>margin</code>.');
   - text: Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>margin</code>.
-    testString: 'assert($(".blue-box").css("margin-left") === "40px", "Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>margin</code>.");'
+    testString: assert($(".blue-box").css("margin-left") === "40px", 'Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>margin</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-padding-of-an-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-padding-of-an-element.english.md
index 53480e189c..cc954a4874 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-padding-of-an-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-padding-of-an-element.english.md
@@ -23,15 +23,15 @@ Use Clockwise Notation to give the ".blue-box" class a <code>padding</code> of <
 ```yml
 tests:
   - text: Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-top") === "40px", "Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-top") === "40px", 'Your <code>blue-box</code> class should give the top of elements <code>40px</code> of <code>padding</code>.');
   - text: Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-right") === "20px", "Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-right") === "20px", 'Your <code>blue-box</code> class should give the right of elements <code>20px</code> of <code>padding</code>.');
   - text: Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-bottom") === "20px", "Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-bottom") === "20px", 'Your <code>blue-box</code> class should give the bottom of elements <code>20px</code> of <code>padding</code>.');
   - text: Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>padding</code>.
-    testString: 'assert($(".blue-box").css("padding-left") === "40px", "Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>padding</code>.");'
+    testString: assert($(".blue-box").css("padding-left") === "40px", 'Your <code>blue-box</code> class should give the left of elements <code>40px</code> of <code>padding</code>.');
   - text: You should use the clockwise notation to set the padding of <code>blue-box</code> class.
-    testString: 'assert(!/padding-top|padding-right|padding-bottom|padding-left/.test(code), "You should use the clockwise notation to set the padding of <code>blue-box</code> class.");'
+    testString: assert(!/padding-top|padding-right|padding-bottom|padding-left/.test(code), 'You should use the clockwise notation to set the padding of <code>blue-box</code> class.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md
index 7694c12841..2347509369 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-selectors-to-style-elements.english.md
@@ -28,15 +28,15 @@ Delete your <code>h2</code> element's style attribute, and instead create a CSS
 ```yml
 tests:
   - text: Remove the style attribute from your <code>h2</code> element.
-    testString: 'assert(!$("h2").attr("style"), "Remove the style attribute from your <code>h2</code> element.");'
+    testString: assert(!$("h2").attr("style"), 'Remove the style attribute from your <code>h2</code> element.');
   - text: Create a <code>style</code> element.
-    testString: 'assert($("style") && $("style").length > 1, "Create a <code>style</code> element.");'
+    testString: assert($("style") && $("style").length > 1, 'Create a <code>style</code> element.');
   - text: Your <code>h2</code> element should be blue.
-    testString: 'assert($("h2").css("color") === "rgb(0, 0, 255)", "Your <code>h2</code> element should be blue.");'
+    testString: assert($("h2").css("color") === "rgb(0, 0, 255)", 'Your <code>h2</code> element should be blue.');
   - text: Ensure that your stylesheet <code>h2</code> declaration is valid with a semicolon and closing brace.
-    testString: 'assert(code.match(/h2\s*\{\s*color\s*:.*;\s*\}/g), "Ensure that your stylesheet <code>h2</code> declaration is valid with a semicolon and closing brace.");'
+    testString: assert(code.match(/h2\s*\{\s*color\s*:.*;\s*\}/g), 'Ensure that your stylesheet <code>h2</code> declaration is valid with a semicolon and closing brace.');
   - text: Make sure all your <code>style</code> elements are valid and have a closing tag.
-    testString: 'assert(code.match(/<\/style>/g) && code.match(/<\/style>/g).length === (code.match(/<style((\s)*((type|media|scoped|title|disabled)="[^"]*")?(\s)*)*>/g) || []).length, "Make sure all your <code>style</code> elements are valid and have a closing tag.");'
+    testString: assert(code.match(/<\/style>/g) && code.match(/<\/style>/g).length === (code.match(/<style((\s)*((type|media|scoped|title|disabled)="[^"]*")?(\s)*)*>/g) || []).length, 'Make sure all your <code>style</code> elements are valid and have a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-variables-to-change-several-elements-at-once.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-variables-to-change-several-elements-at-once.english.md
index 2702f51fa1..0e8048c831 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-variables-to-change-several-elements-at-once.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-css-variables-to-change-several-elements-at-once.english.md
@@ -22,11 +22,11 @@ In the <code>penguin</code> class, change the <code>black</code> value to <code>
 ```yml
 tests:
   - text: <code>penguin</code> class should declare the <code>--penguin-skin</code> variable and assign it to <code>gray</code>.
-    testString: 'assert(code.match(/.penguin\s*?{[\s\S]*--penguin-skin\s*?:\s*?gray\s*?;[\s\S]*}/gi), "<code>penguin</code> class should declare the <code>--penguin-skin</code> variable and assign it to <code>gray</code>.");'
+    testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-skin\s*?:\s*?gray\s*?;[\s\S]*}/gi), '<code>penguin</code> class should declare the <code>--penguin-skin</code> variable and assign it to <code>gray</code>.');
   - text: <code>penguin</code> class should declare the <code>--penguin-belly</code> variable and assign it to <code>white</code>.
-    testString: 'assert(code.match(/.penguin\s*?{[\s\S]*--penguin-belly\s*?:\s*?white\s*?;[\s\S]*}/gi), "<code>penguin</code> class should declare the <code>--penguin-belly</code> variable and assign it to <code>white</code>.");'
+    testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-belly\s*?:\s*?white\s*?;[\s\S]*}/gi), '<code>penguin</code> class should declare the <code>--penguin-belly</code> variable and assign it to <code>white</code>.');
   - text: <code>penguin</code> class should declare the <code>--penguin-beak</code> variable and assign it to <code>orange</code>.
-    testString: 'assert(code.match(/.penguin\s*?{[\s\S]*--penguin-beak\s*?:\s*?orange\s*?;[\s\S]*}/gi), "<code>penguin</code> class should declare the <code>--penguin-beak</code> variable and assign it to <code>orange</code>.");'
+    testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-beak\s*?:\s*?orange\s*?;[\s\S]*}/gi), '<code>penguin</code> class should declare the <code>--penguin-beak</code> variable and assign it to <code>orange</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-for-specific-colors.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-for-specific-colors.english.md
index 98b1587875..25e95b4faf 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-for-specific-colors.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-for-specific-colors.english.md
@@ -24,9 +24,9 @@ Replace the word <code>black</code> in our <code>body</code> element's backgroun
 ```yml
 tests:
   - text: Give your <code>body</code> element the background-color of black.
-    testString: 'assert($("body").css("background-color") === "rgb(0, 0, 0)", "Give your <code>body</code> element the background-color of black.");'
+    testString: assert($("body").css("background-color") === "rgb(0, 0, 0)", 'Give your <code>body</code> element the background-color of black.');
   - text: Use the <code>hex code</code> for the color black instead of the word <code>black</code>.
-    testString: 'assert(code.match(/body\s*{(([\s\S]*;\s*?)|\s*?)background.*\s*:\s*?#000(000)?((\s*})|(;[\s\S]*?}))/gi), "Use the <code>hex code</code> for the color black instead of the word <code>black</code>.");'
+    testString: assert(code.match(/body\s*{(([\s\S]*;\s*?)|\s*?)background.*\s*:\s*?#000(000)?((\s*})|(;[\s\S]*?}))/gi), 'Use the <code>hex code</code> for the color black instead of the word <code>black</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-to-mix-colors.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-to-mix-colors.english.md
index 276a16fc1a..e21b758533 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-to-mix-colors.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-hex-code-to-mix-colors.english.md
@@ -26,21 +26,21 @@ Replace the color words in our <code>style</code> element with their correct hex
 ```yml
 tests:
   - text: Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.
-    testString: 'assert($(".red-text").css("color") === "rgb(255, 0, 0)", "Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.");'
+    testString: assert($('.red-text').css('color') === 'rgb(255, 0, 0)', 'Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.');
   - text: Use the <code>hex code</code> for the color red instead of the word <code>red</code>.
-    testString: 'assert(code.match(/\.red-text\s*?{\s*?color:\s*?#FF0000\s*?;\s*?}/gi), "Use the <code>hex code</code> for the color red instead of the word <code>red</code>.");'
+    testString: assert(code.match(/\.red-text\s*?{\s*?color:\s*?#FF0000\s*?;\s*?}/gi), 'Use the <code>hex code</code> for the color red instead of the word <code>red</code>.');
   - text: Give your <code>h1</code> element with the text <code>I am green!</code> the <code>color</code> green.
-    testString: 'assert($(".green-text").css("color") === "rgb(0, 255, 0)", "Give your <code>h1</code> element with the text <code>I am green!</code> the <code>color</code> green.");'
+    testString: assert($('.green-text').css('color') === 'rgb(0, 255, 0)', 'Give your <code>h1</code> element with the text <code>I am green!</code> the <code>color</code> green.');
   - text: Use the <code>hex code</code> for the color green instead of the word <code>green</code>.
-    testString: 'assert(code.match(/\.green-text\s*?{\s*?color:\s*?#00FF00\s*?;\s*?}/gi), "Use the <code>hex code</code> for the color green instead of the word <code>green</code>.");'
+    testString: assert(code.match(/\.green-text\s*?{\s*?color:\s*?#00FF00\s*?;\s*?}/gi), 'Use the <code>hex code</code> for the color green instead of the word <code>green</code>.');
   - text: Give your <code>h1</code> element with the text <code>I am dodger blue!</code> the <code>color</code> dodger blue.
-    testString: 'assert($(".dodger-blue-text").css("color") === "rgb(30, 144, 255)", "Give your <code>h1</code> element with the text <code>I am dodger blue!</code> the <code>color</code> dodger blue.");'
+    testString: assert($('.dodger-blue-text').css('color') === 'rgb(30, 144, 255)', 'Give your <code>h1</code> element with the text <code>I am dodger blue!</code> the <code>color</code> dodger blue.');
   - text: Use the <code>hex code</code> for the color dodger blue instead of the word <code>dodgerblue</code>.
-    testString: 'assert(code.match(/\.dodger-blue-text\s*?{\s*?color:\s*?#1E90FF\s*?;\s*?}/gi), "Use the <code>hex code</code> for the color dodger blue instead of the word <code>dodgerblue</code>.");'
+    testString: assert(code.match(/\.dodger-blue-text\s*?{\s*?color:\s*?#1E90FF\s*?;\s*?}/gi), 'Use the <code>hex code</code> for the color dodger blue instead of the word <code>dodgerblue</code>.');
   - text: Give your <code>h1</code> element with the text <code>I am orange!</code> the <code>color</code> orange.
-    testString: 'assert($(".orange-text").css("color") === "rgb(255, 165, 0)", "Give your <code>h1</code> element with the text <code>I am orange!</code> the <code>color</code> orange.");'
+    testString: assert($('.orange-text').css('color') === 'rgb(255, 165, 0)', 'Give your <code>h1</code> element with the text <code>I am orange!</code> the <code>color</code> orange.');
   - text: Use the <code>hex code</code> for the color orange instead of the word <code>orange</code>.
-    testString: 'assert(code.match(/\.orange-text\s*?{\s*?color:\s*?#FFA500\s*?;\s*?}/gi), "Use the <code>hex code</code> for the color orange instead of the word <code>orange</code>.");'
+    testString: assert(code.match(/\.orange-text\s*?{\s*?color:\s*?#FFA500\s*?;\s*?}/gi), 'Use the <code>hex code</code> for the color orange instead of the word <code>orange</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-to-mix-colors.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-to-mix-colors.english.md
index 3bbbb96e2c..db1d61b023 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-to-mix-colors.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-to-mix-colors.english.md
@@ -22,21 +22,21 @@ Replace the hex codes in our <code>style</code> element with their correct RGB v
 ```yml
 tests:
   - text: Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.
-    testString: 'assert($(".red-text").css("color") === "rgb(255, 0, 0)", "Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.");'
+    testString: assert($('.red-text').css('color') === 'rgb(255, 0, 0)', 'Give your <code>h1</code> element with the text <code>I am red!</code> the <code>color</code> red.');
   - text: Use <code>rgb</code> for the color red.
-    testString: 'assert(code.match(/\.red-text\s*?{\s*?color:\s*?rgb\(\s*?255\s*?,\s*?0\s*?,\s*?0\s*?\)\s*?;\s*?}/gi), "Use <code>rgb</code> for the color red.");'
+    testString: assert(code.match(/\.red-text\s*?{\s*?color:\s*?rgb\(\s*?255\s*?,\s*?0\s*?,\s*?0\s*?\)\s*?;\s*?}/gi), 'Use <code>rgb</code> for the color red.');
   - text: Give your <code>h1</code> element with the text <code>I am orchid!</code> the <code>color</code> orchid.
-    testString: 'assert($(".orchid-text").css("color") === "rgb(218, 112, 214)", "Give your <code>h1</code> element with the text <code>I am orchid!</code> the <code>color</code> orchid.");'
+    testString: assert($('.orchid-text').css('color') === 'rgb(218, 112, 214)', 'Give your <code>h1</code> element with the text <code>I am orchid!</code> the <code>color</code> orchid.');
   - text: Use <code>rgb</code> for the color orchid.
-    testString: 'assert(code.match(/\.orchid-text\s*?{\s*?color:\s*?rgb\(\s*?218\s*?,\s*?112\s*?,\s*?214\s*?\)\s*?;\s*?}/gi), "Use <code>rgb</code> for the color orchid.");'
+    testString: assert(code.match(/\.orchid-text\s*?{\s*?color:\s*?rgb\(\s*?218\s*?,\s*?112\s*?,\s*?214\s*?\)\s*?;\s*?}/gi), 'Use <code>rgb</code> for the color orchid.');
   - text: Give your <code>h1</code> element with the text <code>I am blue!</code> the <code>color</code> blue.
-    testString: 'assert($(".blue-text").css("color") === "rgb(0, 0, 255)", "Give your <code>h1</code> element with the text <code>I am blue!</code> the <code>color</code> blue.");'
+    testString: assert($('.blue-text').css('color') === 'rgb(0, 0, 255)', 'Give your <code>h1</code> element with the text <code>I am blue!</code> the <code>color</code> blue.');
   - text: Use <code>rgb</code> for the color blue.
-    testString: 'assert(code.match(/\.blue-text\s*?{\s*?color:\s*?rgb\(\s*?0\s*?,\s*?0\s*?,\s*?255\s*?\)\s*?;\s*?}/gi), "Use <code>rgb</code> for the color blue.");'
+    testString: assert(code.match(/\.blue-text\s*?{\s*?color:\s*?rgb\(\s*?0\s*?,\s*?0\s*?,\s*?255\s*?\)\s*?;\s*?}/gi), 'Use <code>rgb</code> for the color blue.');
   - text: Give your <code>h1</code> element with the text <code>I am sienna!</code> the <code>color</code> sienna.
-    testString: 'assert($(".sienna-text").css("color") === "rgb(160, 82, 45)", "Give your <code>h1</code> element with the text <code>I am sienna!</code> the <code>color</code> sienna.");'
+    testString: assert($('.sienna-text').css('color') === 'rgb(160, 82, 45)', 'Give your <code>h1</code> element with the text <code>I am sienna!</code> the <code>color</code> sienna.');
   - text: Use <code>rgb</code> for the color sienna.
-    testString: 'assert(code.match(/\.sienna-text\s*?{\s*?color:\s*?rgb\(\s*?160\s*?,\s*?82\s*?,\s*?45\s*?\)\s*?;\s*?}/gi), "Use <code>rgb</code> for the color sienna.");'
+    testString: assert(code.match(/\.sienna-text\s*?{\s*?color:\s*?rgb\(\s*?160\s*?,\s*?82\s*?,\s*?45\s*?\)\s*?;\s*?}/gi), 'Use <code>rgb</code> for the color sienna.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-values-to-color-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-values-to-color-elements.english.md
index 98736b89e9..ba14ab1a5f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-values-to-color-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-css/use-rgb-values-to-color-elements.english.md
@@ -29,9 +29,9 @@ Let's replace the hex code in our <code>body</code> element's background color w
 ```yml
 tests:
   - text: Your <code>body</code> element should have a black background.
-    testString: 'assert($("body").css("background-color") === "rgb(0, 0, 0)", "Your <code>body</code> element should have a black background.");'
+    testString: assert($("body").css("background-color") === "rgb(0, 0, 0)", 'Your <code>body</code> element should have a black background.');
   - text: Use <code>rgb</code> to give your <code>body</code> element a color of black.
-    testString: 'assert(code.match(/rgb\s*\(\s*0\s*,\s*0\s*,\s*0\s*\)/ig), "Use <code>rgb</code> to give your <code>body</code> element a color of black.");'
+    testString: assert(code.match(/rgb\s*\(\s*0\s*,\s*0\s*,\s*0\s*\)/ig), 'Use <code>rgb</code> to give your <code>body</code> element a color of black.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md
index e07fa5f61f..581ac1ade8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-a-submit-button-to-a-form.english.md
@@ -24,13 +24,13 @@ Add a button as the last element of your <code>form</code> element with a type o
 ```yml
 tests:
   - text: Your form should have a button inside it.
-    testString: 'assert($("form").children("button").length > 0, "Your form should have a button inside it.");'
+    testString: assert($("form").children("button").length > 0, 'Your form should have a button inside it.');
   - text: Your submit button should have the attribute <code>type</code> set to <code>submit</code>.
-    testString: 'assert($("button").attr("type") === "submit", "Your submit button should have the attribute <code>type</code> set to <code>submit</code>.");'
+    testString: assert($("button").attr("type") === "submit", 'Your submit button should have the attribute <code>type</code> set to <code>submit</code>.');
   - text: Your submit button should only have the text "Submit".
-    testString: 'assert($("button").text().match(/^\s*submit\s*$/gi), "Your submit button should only have the text "Submit".");'
+    testString: assert($("button").text().match(/^\s*submit\s*$/gi), 'Your submit button should only have the text "Submit".');
   - text: Make sure your <code>button</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure your <code>button</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure your <code>button</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.english.md
index 343136bae6..0ab4b7a7c5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.english.md
@@ -34,11 +34,11 @@ Finally don't forget to give your image an <code>alt</code> text.
 ```yml
 tests:
   - text: Your page should have an image element.
-    testString: 'assert($("img").length > 0, "Your page should have an image element.");'
+    testString: assert($("img").length > 0, 'Your page should have an image element.');
   - text: Your image should have a <code>src</code> attribute that points to the kitten image.
-    testString: 'assert(new RegExp("\/\/bit.ly\/fcc-relaxing-cat|\/\/s3.amazonaws.com\/freecodecamp\/relaxing-cat.jpg", "gi").test($("img").attr("src")), "Your image should have a <code>src</code> attribute that points to the kitten image.");'
+    testString: assert(new RegExp("\/\/bit.ly\/fcc-relaxing-cat|\/\/s3.amazonaws.com\/freecodecamp\/relaxing-cat.jpg", "gi").test($("img").attr("src")), 'Your image should have a <code>src</code> attribute that points to the kitten image.');
   - text: Your image element <strong>must</strong> have an <code>alt</code> attribute.
-    testString: 'assert(code.match(/alt\s*?=\s*?(\"|\").*(\"|\")/), "Your image element <strong>must</strong> have an <code>alt</code> attribute.");'
+    testString: assert(code.match(/alt\s*?=\s*?(\"|\').*(\"|\')/), 'Your image element <strong>must</strong> have an <code>alt</code> attribute.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.english.md
index 0add23db95..75a2e7519b 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-placeholder-text-to-a-text-field.english.md
@@ -24,11 +24,11 @@ Set the <code>placeholder</code> value of your text <code>input</code> to "cat p
 ```yml
 tests:
   - text: Add a <code>placeholder</code> attribute to the existing text <code>input</code> element.
-    testString: 'assert($("input[placeholder]").length > 0, "Add a <code>placeholder</code> attribute to the existing text <code>input</code> element.");'
+    testString: assert($("input[placeholder]").length > 0, 'Add a <code>placeholder</code> attribute to the existing text <code>input</code> element.');
   - text: Set the value of your placeholder attribute to "cat photo URL".
-    testString: 'assert($("input") && $("input").attr("placeholder") && $("input").attr("placeholder").match(/cat\s+photo\s+URL/gi), "Set the value of your placeholder attribute to "cat photo URL".");'
+    testString: assert($("input") && $("input").attr("placeholder") && $("input").attr("placeholder").match(/cat\s+photo\s+URL/gi), 'Set the value of your placeholder attribute to "cat photo URL".');
   - text: The finished <code>input</code> element should have valid syntax.
-    testString: 'assert($("input[type=text]").length > 0 && code.match(/<input((\s+\w+(\s*=\s*(?:".*?"|".*?"|[\^"">\s]+))?)+\s*|\s*)\/?>/gi), "The finished <code>input</code> element should have valid syntax.");'
+    testString: assert($("input[type=text]").length > 0 && code.match(/<input((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[\^'">\s]+))?)+\s*|\s*)\/?>/gi), 'The finished <code>input</code> element should have valid syntax.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md
index 820ae3c877..07c113bc0c 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.english.md
@@ -23,9 +23,9 @@ Set the first of your <code>radio buttons</code> and the first of your <code>che
 ```yml
 tests:
   - text: Your first radio button on your form should be checked by default.
-    testString: 'assert($("input[type="radio"]").prop("checked"), "Your first radio button on your form should be checked by default.");'
+    testString: assert($('input[type="radio"]').prop("checked"), 'Your first radio button on your form should be checked by default.');
   - text: Your first checkbox on your form should be checked by default.
-    testString: 'assert($("input[type="checkbox"]").prop("checked"), "Your first checkbox on your form should be checked by default.");'
+    testString: assert($('input[type="checkbox"]').prop("checked"), 'Your first checkbox on your form should be checked by default.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/comment-out-html.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/comment-out-html.english.md
index d2a1f6b80c..119eb93f28 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/comment-out-html.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/comment-out-html.english.md
@@ -22,15 +22,15 @@ Comment out your <code>h1</code> element and your <code>p</code> element, but no
 ```yml
 tests:
   - text: Comment out your <code>h1</code> element so that it is not visible on your page.
-    testString: 'assert(($("h1").length === 0), "Comment out your <code>h1</code> element so that it is not visible on your page.");'
+    testString: assert(($("h1").length === 0), 'Comment out your <code>h1</code> element so that it is not visible on your page.');
   - text: Leave your <code>h2</code> element uncommented so that it is visible on your page.
-    testString: 'assert(($("h2").length > 0), "Leave your <code>h2</code> element uncommented so that it is visible on your page.");'
+    testString: assert(($("h2").length > 0), 'Leave your <code>h2</code> element uncommented so that it is visible on your page.');
   - text: Comment out your <code>p</code> element so that it is not visible on your page.
-    testString: 'assert(($("p").length === 0), "Comment out your <code>p</code> element so that it is not visible on your page.");'
-  - text: 'Be sure to close each of your comments with <code>--&#62;</code>.'
-    testString: 'assert(code.match(/[^fc]-->/g).length > 1, "Be sure to close each of your comments with <code>--&#62;</code>.");'
+    testString: assert(($("p").length === 0), 'Comment out your <code>p</code> element so that it is not visible on your page.');
+  - text: Be sure to close each of your comments with <code>--&#62;</code>.
+    testString: assert(code.match(/[^fc]-->/g).length > 1, 'Be sure to close each of your comments with <code>--&#62;</code>.');
   - text: Do not change the order of the <code>h1</code> <code>h2</code> or <code>p</code> in the code.
-    testString: 'assert((code.match(/<([a-z0-9]){1,2}>/g)[0]==="<h1>" && code.match(/<([a-z0-9]){1,2}>/g)[1]==="<h2>" && code.match(/<([a-z0-9]){1,2}>/g)[2]==="<p>") , "Do not change the order of the <code>h1</code> <code>h2</code> or <code>p</code> in the code.");'
+    testString: assert((code.match(/<([a-z0-9]){1,2}>/g)[0]==="<h1>" && code.match(/<([a-z0-9]){1,2}>/g)[1]==="<h2>" && code.match(/<([a-z0-9]){1,2}>/g)[2]==="<p>") , 'Do not change the order of the <code>h1</code> <code>h2</code> or <code>p</code> in the code.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.english.md
index ab6b105591..857c1496d5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-bulleted-unordered-list.english.md
@@ -25,13 +25,13 @@ Remove the last two <code>p</code> elements and create an unordered list of thre
 ```yml
 tests:
   - text: Create a <code>ul</code> element.
-    testString: 'assert($("ul").length > 0, "Create a <code>ul</code> element.");'
+    testString: assert($("ul").length > 0, 'Create a <code>ul</code> element.');
   - text: You should have three <code>li</code> elements within your <code>ul</code> element.
-    testString: 'assert($("ul li").length > 2, "You should have three <code>li</code> elements within your <code>ul</code> element.");'
+    testString: assert($("ul li").length > 2, 'You should have three <code>li</code> elements within your <code>ul</code> element.');
   - text: Make sure your <code>ul</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/ul>/gi) && code.match(/<ul/gi) && code.match(/<\/ul>/gi).length === code.match(/<ul/gi).length, "Make sure your <code>ul</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/ul>/gi) && code.match(/<ul/gi) && code.match(/<\/ul>/gi).length === code.match(/<ul/gi).length, 'Make sure your <code>ul</code> element has a closing tag.');
   - text: Make sure your <code>li</code> elements have closing tags.
-    testString: 'assert(code.match(/<\/li>/gi) && code.match(/<li[\s>]/gi) && code.match(/<\/li>/gi).length === code.match(/<li[\s>]/gi).length, "Make sure your <code>li</code> elements have closing tags.");'
+    testString: assert(code.match(/<\/li>/gi) && code.match(/<li[\s>]/gi) && code.match(/<\/li>/gi).length === code.match(/<li[\s>]/gi).length, 'Make sure your <code>li</code> elements have closing tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md
index 4d6a5fb7af..44899510ce 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-form-element.english.md
@@ -23,11 +23,11 @@ Nest your text field inside a <code>form</code> element, and add the <code>actio
 ```yml
 tests:
   - text: Nest your text input element within a <code>form</code> element.
-    testString: 'assert($("form") && $("form").children("input") && $("form").children("input").length > 0, "Nest your text input element within a <code>form</code> element.");'
+    testString: assert($("form") && $("form").children("input") && $("form").children("input").length > 0, 'Nest your text input element within a <code>form</code> element.');
   - text: Make sure your <code>form</code> has an <code>action</code> attribute which is set to <code>/submit-cat-photo</code>
-    testString: 'assert($("form").attr("action") === "/submit-cat-photo", "Make sure your <code>form</code> has an <code>action</code> attribute which is set to <code>/submit-cat-photo</code>");'
+    testString: assert($("form").attr("action") === "/submit-cat-photo", 'Make sure your <code>form</code> has an <code>action</code> attribute which is set to <code>/submit-cat-photo</code>');
   - text: Make sure your <code>form</code> element has well-formed open and close tags.
-    testString: 'assert(code.match(/<\/form>/g) && code.match(/<form [^<]*>/g) && code.match(/<\/form>/g).length === code.match(/<form [^<]*>/g).length, "Make sure your <code>form</code> element has well-formed open and close tags.");'
+    testString: assert(code.match(/<\/form>/g) && code.match(/<form [^<]*>/g) && code.match(/<\/form>/g).length === code.match(/<form [^<]*>/g).length, 'Make sure your <code>form</code> element has well-formed open and close tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md
index 7894aff34b..a6deebafd8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-checkboxes.english.md
@@ -27,13 +27,13 @@ Add to your form a set of three checkboxes. Each checkbox should be nested withi
 ```yml
 tests:
   - text: Your page should have three checkbox elements.
-    testString: 'assert($("input[type="checkbox"]").length > 2, "Your page should have three checkbox elements.");'
+    testString: assert($('input[type="checkbox"]').length > 2, 'Your page should have three checkbox elements.');
   - text: Each of your three checkbox elements should be nested in its own <code>label</code> element.
-    testString: 'assert($("label > input[type="checkbox"]:only-child").length > 2, "Each of your three checkbox elements should be nested in its own <code>label</code> element.");'
+    testString: assert($('label > input[type="checkbox"]:only-child').length > 2, 'Each of your three checkbox elements should be nested in its own <code>label</code> element.');
   - text: Make sure each of your <code>label</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/label>/g) && code.match(/<label/g) && code.match(/<\/label>/g).length === code.match(/<label/g).length, "Make sure each of your <code>label</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/label>/g) && code.match(/<label/g) && code.match(/<\/label>/g).length === code.match(/<label/g).length, 'Make sure each of your <code>label</code> elements has a closing tag.');
   - text: Give your checkboxes the <code>name</code> attribute of <code>personality</code>.
-    testString: 'assert($("label > input[type="checkbox"]").filter("[name="personality"]").length > 2, "Give your checkboxes the <code>name</code> attribute of <code>personality</code>.");'
+    testString: assert($('label > input[type="checkbox"]').filter("[name='personality']").length > 2, 'Give your checkboxes the <code>name</code> attribute of <code>personality</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md
index e636ae5079..9d49ba7fca 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-set-of-radio-buttons.english.md
@@ -28,19 +28,19 @@ Add a pair of radio buttons to your form, each nested in its own label element.
 ```yml
 tests:
   - text: Your page should have two radio button elements.
-    testString: 'assert($("input[type="radio"]").length > 1, "Your page should have two radio button elements.");'
+    testString: assert($('input[type="radio"]').length > 1, 'Your page should have two radio button elements.');
   - text: Give your radio buttons the <code>name</code> attribute of <code>indoor-outdoor</code>.
-    testString: 'assert($("label > input[type="radio"]").filter("[name="indoor-outdoor"]").length > 1, "Give your radio buttons the <code>name</code> attribute of <code>indoor-outdoor</code>.");'
+    testString: assert($('label > input[type="radio"]').filter("[name='indoor-outdoor']").length > 1, 'Give your radio buttons the <code>name</code> attribute of <code>indoor-outdoor</code>.');
   - text: Each of your two radio button elements should be nested in its own <code>label</code> element.
-    testString: 'assert($("label > input[type="radio"]:only-child").length > 1, "Each of your two radio button elements should be nested in its own <code>label</code> element.");'
+    testString: assert($('label > input[type="radio"]:only-child').length > 1, 'Each of your two radio button elements should be nested in its own <code>label</code> element.');
   - text: Make sure each of your <code>label</code> elements has a closing tag.
-    testString: 'assert((code.match(/<\/label>/g) && code.match(/<label/g) && code.match(/<\/label>/g).length === code.match(/<label/g).length), "Make sure each of your <code>label</code> elements has a closing tag.");'
+    testString: assert((code.match(/<\/label>/g) && code.match(/<label/g) && code.match(/<\/label>/g).length === code.match(/<label/g).length), 'Make sure each of your <code>label</code> elements has a closing tag.');
   - text: One of your radio buttons should have the label <code>indoor</code>.
-    testString: 'assert($("label").text().match(/indoor/gi), "One of your radio buttons should have the label <code>indoor</code>.");'
+    testString: assert($("label").text().match(/indoor/gi), 'One of your radio buttons should have the label <code>indoor</code>.');
   - text: One of your radio buttons should have the label <code>outdoor</code>.
-    testString: 'assert($("label").text().match(/outdoor/gi), "One of your radio buttons should have the label <code>outdoor</code>.");'
+    testString: assert($("label").text().match(/outdoor/gi), 'One of your radio buttons should have the label <code>outdoor</code>.');
   - text: Each of your radio button elements should be added within the <code>form</code> tag.
-    testString: 'assert($("label").parent().get(0).tagName.match("FORM"), "Each of your radio button elements should be added within the <code>form</code> tag.");'
+    testString: assert($("label").parent().get(0).tagName.match('FORM'), 'Each of your radio button elements should be added within the <code>form</code> tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.english.md
index 20fb6796c4..5ea8461452 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-a-text-field.english.md
@@ -25,7 +25,7 @@ Create an <code>input</code> element of type <code>text</code> below your lists.
 ```yml
 tests:
   - text: Your app should have an <code>input</code> element of type <code>text</code>.
-    testString: 'assert($("input[type=text]").length > 0, "Your app should have an <code>input</code> element of type <code>text</code>.");'
+    testString: assert($("input[type=text]").length > 0, 'Your app should have an <code>input</code> element of type <code>text</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.english.md
index 1f2feb1f93..2143daee70 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/create-an-ordered-list.english.md
@@ -24,24 +24,24 @@ Create an ordered list of the top 3 things cats hate the most.
 
 ```yml
 tests:
-  - text: 'You should have an ordered list for "Top 3 things cats hate:"'
-    testString: 'assert((/Top 3 things cats hate:/i).test($("ol").prev().text()), "You should have an ordered list for "Top 3 things cats hate:"");'
-  - text: 'You should have an unordered list for "Things cats love:"'
-    testString: 'assert((/Things cats love:/i).test($("ul").prev().text()), "You should have an unordered list for "Things cats love:"");'
+  - text: You should have an ordered list for "Top 3 things cats hate:"
+    testString: assert((/Top 3 things cats hate:/i).test($("ol").prev().text()), 'You should have an ordered list for "Top 3 things cats hate:"');
+  - text: You should have an unordered list for "Things cats love:"
+    testString: assert((/Things cats love:/i).test($("ul").prev().text()), 'You should have an unordered list for "Things cats love:"');
   - text: You should have only one <code>ul</code> element.
-    testString: 'assert.equal($("ul").length, 1, "You should have only one <code>ul</code> element.");'
+    testString: assert.equal($("ul").length, 1, 'You should have only one <code>ul</code> element.');
   - text: You should have only one <code>ol</code> element.
-    testString: 'assert.equal($("ol").length, 1, "You should have only one <code>ol</code> element.");'
+    testString: assert.equal($("ol").length, 1, 'You should have only one <code>ol</code> element.');
   - text: You should have three <code>li</code> elements within your <code>ul</code> element.
-    testString: 'assert.equal($("ul li").length, 3, "You should have three <code>li</code> elements within your <code>ul</code> element.");'
+    testString: assert.equal($("ul li").length, 3, 'You should have three <code>li</code> elements within your <code>ul</code> element.');
   - text: You should have three <code>li</code> elements within your <code>ol</code> element.
-    testString: 'assert.equal($("ol li").length, 3, "You should have three <code>li</code> elements within your <code>ol</code> element.");'
+    testString: assert.equal($("ol li").length, 3, 'You should have three <code>li</code> elements within your <code>ol</code> element.');
   - text: Make sure your <code>ul</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/ul>/g) && code.match(/<\/ul>/g).length === code.match(/<ul>/g).length, "Make sure your <code>ul</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/ul>/g) && code.match(/<\/ul>/g).length === code.match(/<ul>/g).length, 'Make sure your <code>ul</code> element has a closing tag.');
   - text: Make sure your <code>ol</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/ol>/g) && code.match(/<\/ol>/g).length === code.match(/<ol>/g).length, "Make sure your <code>ol</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/ol>/g) && code.match(/<\/ol>/g).length === code.match(/<ol>/g).length, 'Make sure your <code>ol</code> element has a closing tag.');
   - text: Make sure your <code>li</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/li>/g) && code.match(/<li>/g) && code.match(/<\/li>/g).length === code.match(/<li>/g).length, "Make sure your <code>li</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/li>/g) && code.match(/<li>/g) && code.match(/<\/li>/g).length === code.match(/<li>/g).length, 'Make sure your <code>li</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/declare-the-doctype-of-an-html-document.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/declare-the-doctype-of-an-html-document.english.md
index 11cda22864..5ce71d84bf 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/declare-the-doctype-of-an-html-document.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/declare-the-doctype-of-an-html-document.english.md
@@ -27,11 +27,11 @@ Add a <code>DOCTYPE</code> tag for HTML5 to the top of the blank HTML document i
 ```yml
 tests:
   - text: Your code should include a <code>&lt;!DOCTYPE html&gt;</code> tag.
-    testString: 'assert(code.match(/<!DOCTYPE\s+?html\s*?>/gi), "Your code should include a <code>&lt;!DOCTYPE html&gt;</code> tag.");'
+    testString: assert(code.match(/<!DOCTYPE\s+?html\s*?>/gi), 'Your code should include a <code>&lt;!DOCTYPE html&gt;</code> tag.');
   - text: There should be one <code>html</code> element.
-    testString: 'assert($("html").length == 1, "There should be one <code>html</code> element.");'
+    testString: assert($('html').length == 1, 'There should be one <code>html</code> element.');
   - text: The <code>html</code> tags should wrap around one <code>h1</code> element.
-    testString: 'assert(code.match(/<html>\s*?<h1>\s*?.*?\s*?<\/h1>\s*?<\/html>/gi), "The <code>html</code> tags should wrap around one <code>h1</code> element.");'
+    testString: assert(code.match(/<html>\s*?<h1>\s*?.*?\s*?<\/h1>\s*?<\/html>/gi), 'The <code>html</code> tags should wrap around one <code>h1</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/define-the-head-and-body-of-an-html-document.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/define-the-head-and-body-of-an-html-document.english.md
index 3cd68a5af0..57183ce432 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/define-the-head-and-body-of-an-html-document.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/define-the-head-and-body-of-an-html-document.english.md
@@ -24,17 +24,17 @@ Edit the markup so there's a <code>head</code> and a <code>body</code>. The <cod
 ```yml
 tests:
   - text: There should be only one <code>head</code> element on the page.
-    testString: 'assert($("head").length == 1, "There should be only one <code>head</code> element on the page.");'
+    testString: assert($('head').length == 1, 'There should be only one <code>head</code> element on the page.');
   - text: There should be only one <code>body</code> element on the page.
-    testString: 'assert($("body").length == 1, "There should be only one <code>body</code> element on the page.");'
+    testString: assert($('body').length == 1, 'There should be only one <code>body</code> element on the page.');
   - text: The <code>head</code> element should be a child of the <code>html</code> element.
-    testString: 'assert($("html").children("head").length == 1, "The <code>head</code> element should be a child of the <code>html</code> element.");'
+    testString: assert($('html').children('head').length == 1, 'The <code>head</code> element should be a child of the <code>html</code> element.');
   - text: The <code>body</code> element should be a child of the <code>html</code> element.
-    testString: 'assert($("html").children("body").length == 1, "The <code>body</code> element should be a child of the <code>html</code> element.");'
+    testString: assert($('html').children('body').length == 1, 'The <code>body</code> element should be a child of the <code>html</code> element.');
   - text: The <code>head</code> element should wrap around the <code>title</code> element.
-    testString: 'assert(code.match(/<head>\s*?<title>\s*?.*?\s*?<\/title>\s*?<\/head>/gi), "The <code>head</code> element should wrap around the <code>title</code> element.");'
+    testString: assert(code.match(/<head>\s*?<title>\s*?.*?\s*?<\/title>\s*?<\/head>/gi), 'The <code>head</code> element should wrap around the <code>title</code> element.');
   - text: The <code>body</code> element should wrap around both the <code>h1</code> and <code>p</code> elements.
-    testString: 'assert($("body").children("h1").length == 1 && $("body").children("p").length == 1, "The <code>body</code> element should wrap around both the <code>h1</code> and <code>p</code> elements.");'
+    testString: assert($('body').children('h1').length == 1 && $('body').children('p').length == 1, 'The <code>body</code> element should wrap around both the <code>h1</code> and <code>p</code> elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/delete-html-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/delete-html-elements.english.md
index b53e9fd3b5..4a1118f89d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/delete-html-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/delete-html-elements.english.md
@@ -22,11 +22,11 @@ Delete your <code>h1</code> element so we can simplify our view.
 ```yml
 tests:
   - text: Delete your <code>h1</code> element.
-    testString: 'assert(!code.match(/<h1>/gi) && !code.match(/<\/h1>/gi), "Delete your <code>h1</code> element.");'
+    testString: assert(!code.match(/<h1>/gi) && !code.match(/<\/h1>/gi), 'Delete your <code>h1</code> element.');
   - text: Leave your <code>h2</code> element on the page.
-    testString: 'assert(code.match(/<h2>[\w\W]*<\/h2>/gi), "Leave your <code>h2</code> element on the page.");'
+    testString: assert(code.match(/<h2>[\w\W]*<\/h2>/gi), 'Leave your <code>h2</code> element on the page.');
   - text: Leave your <code>p</code> element on the page.
-    testString: 'assert(code.match(/<p>[\w\W]*<\/p>/gi), "Leave your <code>p</code> element on the page.");'
+    testString: assert(code.match(/<p>[\w\W]*<\/p>/gi), 'Leave your <code>p</code> element on the page.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/fill-in-the-blank-with-placeholder-text.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/fill-in-the-blank-with-placeholder-text.english.md
index c171b1818e..a2b2565661 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/fill-in-the-blank-with-placeholder-text.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/fill-in-the-blank-with-placeholder-text.english.md
@@ -23,7 +23,7 @@ Replace the text inside your <code>p</code> element with the first few words of
 ```yml
 tests:
   - text: Your <code>p</code> element should contain the first few words of the provided <code>kitty ipsum text</code>.
-    testString: 'assert.isTrue((/Kitty(\s)+ipsum/gi).test($("p").text()), "Your <code>p</code> element should contain the first few words of the provided <code>kitty ipsum text</code>.");'
+    testString: assert.isTrue((/Kitty(\s)+ipsum/gi).test($("p").text()), 'Your <code>p</code> element should contain the first few words of the provided <code>kitty ipsum text</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/headline-with-the-h2-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/headline-with-the-h2-element.english.md
index c7d0e2656d..7c652013e0 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/headline-with-the-h2-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/headline-with-the-h2-element.english.md
@@ -23,13 +23,13 @@ Add an <code>h2</code> tag that says "CatPhotoApp" to create a second HTML <code
 ```yml
 tests:
   - text: Create an <code>h2</code> element.
-    testString: 'assert(($("h2").length > 0), "Create an <code>h2</code> element.");'
+    testString: assert(($("h2").length > 0), 'Create an <code>h2</code> element.');
   - text: Make sure your <code>h2</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/h2>/g) && code.match(/<\/h2>/g).length === code.match(/<h2>/g).length, "Make sure your <code>h2</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/h2>/g) && code.match(/<\/h2>/g).length === code.match(/<h2>/g).length, 'Make sure your <code>h2</code> element has a closing tag.');
   - text: Your <code>h2</code> element should have the text "CatPhotoApp".
-    testString: 'assert.isTrue((/cat(\s)?photo(\s)?app/gi).test($("h2").text()), "Your <code>h2</code> element should have the text "CatPhotoApp".");'
+    testString: assert.isTrue((/cat(\s)?photo(\s)?app/gi).test($("h2").text()), 'Your <code>h2</code> element should have the text "CatPhotoApp".');
   - text: Your <code>h1</code> element should have the text "Hello World".
-    testString: 'assert.isTrue((/hello(\s)+world/gi).test($("h1").text()), "Your <code>h1</code> element should have the text "Hello World".");'
+    testString: assert.isTrue((/hello(\s)+world/gi).test($("h1").text()), 'Your <code>h1</code> element should have the text "Hello World".');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/inform-with-the-paragraph-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/inform-with-the-paragraph-element.english.md
index a2fae81505..870afa33b4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/inform-with-the-paragraph-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/inform-with-the-paragraph-element.english.md
@@ -23,11 +23,11 @@ Create a <code>p</code> element below your <code>h2</code> element, and give it
 ```yml
 tests:
   - text: Create a <code>p</code> element.
-    testString: 'assert(($("p").length > 0), "Create a <code>p</code> element.");'
+    testString: assert(($("p").length > 0), 'Create a <code>p</code> element.');
   - text: Your <code>p</code> element should have the text "Hello Paragraph".
-    testString: 'assert.isTrue((/hello(\s)+paragraph/gi).test($("p").text()), "Your <code>p</code> element should have the text "Hello Paragraph".");'
+    testString: assert.isTrue((/hello(\s)+paragraph/gi).test($("p").text()), 'Your <code>p</code> element should have the text "Hello Paragraph".');
   - text: Make sure your <code>p</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/p>/g) && code.match(/<\/p>/g).length === code.match(/<p/g).length, "Make sure your <code>p</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/p>/g) && code.match(/<\/p>/g).length === code.match(/<p/g).length, 'Make sure your <code>p</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/introduction-to-html5-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/introduction-to-html5-elements.english.md
index f8930fe6d6..6aef36ecbd 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/introduction-to-html5-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/introduction-to-html5-elements.english.md
@@ -25,19 +25,19 @@ Wrap the paragraphs with an opening and closing <code>main</code> tag.
 ```yml
 tests:
   - text: You need 2 <code>p</code> elements with Kitty Ipsum text.
-    testString: 'assert($("p").length > 1, "You need 2 <code>p</code> elements with Kitty Ipsum text.");'
+    testString: assert($("p").length > 1, 'You need 2 <code>p</code> elements with Kitty Ipsum text.');
   - text: Make sure each of your <code>p</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/p>/g) && code.match(/<\/p>/g).length === code.match(/<p/g).length, "Make sure each of your <code>p</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/p>/g) && code.match(/<\/p>/g).length === code.match(/<p/g).length, 'Make sure each of your <code>p</code> elements has a closing tag.');
   - text: Your <code>p</code> element should contain the first few words of the provided additional <code>kitty ipsum text</code>.
-    testString: 'assert.isTrue((/Purr\s+jump\s+eat/gi).test($("p").text()), "Your <code>p</code> element should contain the first few words of the provided additional <code>kitty ipsum text</code>.");'
+    testString: assert.isTrue((/Purr\s+jump\s+eat/gi).test($("p").text()), 'Your <code>p</code> element should contain the first few words of the provided additional <code>kitty ipsum text</code>.');
   - text: Your code should have one <code>main</code> element.
-    testString: 'assert($("main").length === 1, "Your code should have one <code>main</code> element.");'
+    testString: assert($('main').length === 1, 'Your code should have one <code>main</code> element.');
   - text: The <code>main</code> element should have two paragraph elements as children.
-    testString: 'assert($("main").children("p").length === 2, "The <code>main</code> element should have two paragraph elements as children.");'
+    testString: assert($("main").children("p").length === 2, 'The <code>main</code> element should have two paragraph elements as children.');
   - text: The opening <code>main</code> tag should come before the first paragraph tag.
-    testString: 'assert(code.match(/<main>\s*?<p>/g), "The opening <code>main</code> tag should come before the first paragraph tag.");'
+    testString: assert(code.match(/<main>\s*?<p>/g), 'The opening <code>main</code> tag should come before the first paragraph tag.');
   - text: The closing <code>main</code> tag should come after the second closing paragraph tag.
-    testString: 'assert(code.match(/<\/p>\s*?<\/main>/g), "The closing <code>main</code> tag should come after the second closing paragraph tag.");'
+    testString: assert(code.match(/<\/p>\s*?<\/main>/g), 'The closing <code>main</code> tag should come after the second closing paragraph tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md
index 1cea01f83e..a5b681222e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-external-pages-with-anchor-elements.english.md
@@ -24,11 +24,11 @@ Create an <code>a</code> element that links to <code>http://freecatphotoapp.com<
 ```yml
 tests:
   - text: Your <code>a</code> element should have the <code>anchor text</code> of "cat photos".
-    testString: 'assert((/cat photos/gi).test($("a").text()), "Your <code>a</code> element should have the <code>anchor text</code> of "cat photos".");'
-  - text: 'You need an <code>a</code> element that links to <code>http&#58;//freecatphotoapp<wbr>.com</code>'
-    testString: 'assert(/http:\/\/(www\.)?freecatphotoapp\.com/gi.test($("a").attr("href")), "You need an <code>a</code> element that links to <code>http&#58;//freecatphotoapp<wbr>.com</code>");'
+    testString: assert((/cat photos/gi).test($("a").text()), 'Your <code>a</code> element should have the <code>anchor text</code> of "cat photos".');
+  - text: You need an <code>a</code> element that links to <code>http&#58;//freecatphotoapp<wbr>.com</code>
+    testString: assert(/http:\/\/(www\.)?freecatphotoapp\.com/gi.test($("a").attr("href")), 'You need an <code>a</code> element that links to <code>http&#58;//freecatphotoapp<wbr>.com</code>');
   - text: Make sure your <code>a</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/a>/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length, "Make sure your <code>a</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/a>/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length, 'Make sure your <code>a</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md
index ec9818b2f8..9cd366176e 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements.english.md
@@ -27,17 +27,17 @@ Then add an <code>id</code> attribute with a value of "footer" to the <code>&lt;
 ```yml
 tests:
   - text: There should be only one anchor tag on your page.
-    testString: 'assert($("a").length == 1, "There should be only one anchor tag on your page.");'
+    testString: assert($('a').length == 1, 'There should be only one anchor tag on your page.');
   - text: There should be only one <code>footer</code> tag on your page.
-    testString: 'assert($("footer").length == 1, "There should be only one <code>footer</code> tag on your page.");'
-  - text: 'The <code>a</code> tag should have an <code>href</code> attribute set to "#footer".'
-    testString: 'assert($("a").eq(0).attr("href") == "#footer", "The <code>a</code> tag should have an <code>href</code> attribute set to "#footer".");'
+    testString: assert($('footer').length == 1, 'There should be only one <code>footer</code> tag on your page.');
+  - text: The <code>a</code> tag should have an <code>href</code> attribute set to "#footer".
+    testString: assert($('a').eq(0).attr('href') == "#footer", 'The <code>a</code> tag should have an <code>href</code> attribute set to "#footer".');
   - text: The <code>a</code> tag should not have a <code>target</code> attribute
-    testString: 'assert(typeof $("a").eq(0).attr("target") == typeof undefined || $("a").eq(0).attr("target") == true, "The <code>a</code> tag should not have a <code>target</code> attribute");'
+    testString: assert(typeof $('a').eq(0).attr('target') == typeof undefined || $('a').eq(0).attr('target') == true, 'The <code>a</code> tag should not have a <code>target</code> attribute');
   - text: The <code>a</code> text should be "Jump to Bottom".
-    testString: 'assert($("a").eq(0).text().match(/Jump to Bottom/gi), "The <code>a</code> text should be "Jump to Bottom".");'
+    testString: assert($('a').eq(0).text().match(/Jump to Bottom/gi), 'The <code>a</code> text should be "Jump to Bottom".');
   - text: The <code>footer</code> tag should have an <code>id</code> attribute set to "footer".
-    testString: 'assert($("footer").eq(0).attr("id") == "footer", "The <code>footer</code> tag should have an <code>id</code> attribute set to "footer".");'
+    testString: assert($('footer').eq(0).attr('id') == "footer", 'The <code>footer</code> tag should have an <code>id</code> attribute set to "footer".');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md
index 9ce9ab2459..3fc610e057 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/make-dead-links-using-the-hash-symbol.english.md
@@ -22,8 +22,8 @@ For example: <code>href="#"</code>
 
 ```yml
 tests:
-  - text: 'Your <code>a</code> element should be a dead link with the value of the <code>href</code> attribute set to "#".'
-    testString: 'assert($("a").attr("href") === "#", "Your <code>a</code> element should be a dead link with the value of the <code>href</code> attribute set to "#".");'
+  - text: Your <code>a</code> element should be a dead link with the value of the <code>href</code> attribute set to "#".
+    testString: assert($("a").attr("href") === "#", 'Your <code>a</code> element should be a dead link with the value of the <code>href</code> attribute set to "#".');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md
index e43ea507ca..dad73340ea 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-an-anchor-element-within-a-paragraph.english.md
@@ -28,22 +28,22 @@ Now nest your existing <code>a</code> element within a new <code>p</code> elemen
 
 ```yml
 tests:
-  - text: 'You need an <code>a</code> element that links to "http://freecatphotoapp.com".'
-    testString: 'assert(($("a[href=\"http://freecatphotoapp.com\"]").length > 0 || $("a[href=\"http://www.freecatphotoapp.com\"]").length > 0), "You need an <code>a</code> element that links to "http://freecatphotoapp.com".");'
+  - text: You need an <code>a</code> element that links to "http://freecatphotoapp.com".
+    testString: assert(($("a[href=\"http://freecatphotoapp.com\"]").length > 0 || $("a[href=\"http://www.freecatphotoapp.com\"]").length > 0), 'You need an <code>a</code> element that links to "http://freecatphotoapp.com".');
   - text: Your <code>a</code> element should have the anchor text of "cat photos"
-    testString: 'assert($("a").text().match(/cat\sphotos/gi), "Your <code>a</code> element should have the anchor text of "cat photos"");'
+    testString: assert($("a").text().match(/cat\sphotos/gi), 'Your <code>a</code> element should have the anchor text of "cat photos"');
   - text: Create a new <code>p</code> element around your <code>a</code> element. There should be at least 3 total <code>p</code> tags in your HTML code.
-    testString: 'assert($("p") && $("p").length > 2, "Create a new <code>p</code> element around your <code>a</code> element. There should be at least 3 total <code>p</code> tags in your HTML code.");'
+    testString: assert($("p") && $("p").length > 2, 'Create a new <code>p</code> element around your <code>a</code> element. There should be at least 3 total <code>p</code> tags in your HTML code.');
   - text: Your <code>a</code> element should be nested within your new <code>p</code> element.
-    testString: 'assert(($("a[href=\"http://freecatphotoapp.com\"]").parent().is("p") || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().is("p")), "Your <code>a</code> element should be nested within your new <code>p</code> element.");'
+    testString: assert(($("a[href=\"http://freecatphotoapp.com\"]").parent().is("p") || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().is("p")), 'Your <code>a</code> element should be nested within your new <code>p</code> element.');
   - text: Your <code>p</code> element should have the text "View more " (with a space after it).
-    testString: 'assert(($("a[href=\"http://freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi) || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi)), "Your <code>p</code> element should have the text "View more " (with a space after it).");'
+    testString: assert(($("a[href=\"http://freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi) || $("a[href=\"http://www.freecatphotoapp.com\"]").parent().text().match(/View\smore\s/gi)), 'Your <code>p</code> element should have the text "View more " (with a space after it).');
   - text: Your <code>a</code> element should <em>not</em> have the text "View more".
-    testString: 'assert(!$("a").text().match(/View\smore/gi), "Your <code>a</code> element should <em>not</em> have the text "View more".");'
+    testString: assert(!$("a").text().match(/View\smore/gi), 'Your <code>a</code> element should <em>not</em> have the text "View more".');
   - text: Make sure each of your <code>p</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/p>/g) && code.match(/<p/g) && code.match(/<\/p>/g).length === code.match(/<p/g).length, "Make sure each of your <code>p</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/p>/g) && code.match(/<p/g) && code.match(/<\/p>/g).length === code.match(/<p/g).length, 'Make sure each of your <code>p</code> elements has a closing tag.');
   - text: Make sure each of your <code>a</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/a>/g) && code.match(/<a/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length, "Make sure each of your <code>a</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/a>/g) && code.match(/<a/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length, 'Make sure each of your <code>a</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md
index 67ac458f55..d8686fbbe0 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.english.md
@@ -24,13 +24,13 @@ Hint: Try putting your opening <code>div</code> tag above your "Things cats love
 ```yml
 tests:
   - text: Nest your <code>p</code> elements inside your <code>div</code> element.
-    testString: 'assert($("div").children("p").length > 1, "Nest your <code>p</code> elements inside your <code>div</code> element.");'
+    testString: assert($("div").children("p").length > 1, 'Nest your <code>p</code> elements inside your <code>div</code> element.');
   - text: Nest your <code>ul</code> element inside your <code>div</code> element.
-    testString: 'assert($("div").children("ul").length > 0, "Nest your <code>ul</code> element inside your <code>div</code> element.");'
+    testString: assert($("div").children("ul").length > 0, 'Nest your <code>ul</code> element inside your <code>div</code> element.');
   - text: Nest your <code>ol</code> element inside your <code>div</code> element.
-    testString: 'assert($("div").children("ol").length > 0, "Nest your <code>ol</code> element inside your <code>div</code> element.");'
+    testString: assert($("div").children("ol").length > 0, 'Nest your <code>ol</code> element inside your <code>div</code> element.');
   - text: Make sure your <code>div</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<\/div>/g).length === code.match(/<div>/g).length, "Make sure your <code>div</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<\/div>/g).length === code.match(/<div>/g).length, 'Make sure your <code>div</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/say-hello-to-html-elements.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/say-hello-to-html-elements.english.md
index 12e672d9aa..3842460f24 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/say-hello-to-html-elements.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/say-hello-to-html-elements.english.md
@@ -30,7 +30,7 @@ To pass the test on this challenge, change your <code>h1</code> element's text t
 ```yml
 tests:
   - text: Your <code>h1</code> element should have the text "Hello World".
-    testString: 'assert.isTrue((/hello(\s)+world/gi).test($("h1").text()), "Your <code>h1</code> element should have the text "Hello World".");'
+    testString: assert.isTrue((/hello(\s)+world/gi).test($('h1').text()), 'Your <code>h1</code> element should have the text "Hello World".');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.english.md
index cadab5b855..34ce46eb00 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/turn-an-image-into-a-link.english.md
@@ -25,11 +25,11 @@ Once you've done this, hover over your image with your cursor. Your cursor's nor
 ```yml
 tests:
   - text: Nest the existing <code>img</code> element within an <code>a</code> element.
-    testString: 'assert($("a").children("img").length > 0, "Nest the existing <code>img</code> element within an <code>a</code> element.");'
-  - text: 'Your <code>a</code> element should be a dead link with a <code>href</code> attribute set to <code>#</code>.'
-    testString: 'assert(new RegExp("#").test($("a").children("img").parent().attr("href")), "Your <code>a</code> element should be a dead link with a <code>href</code> attribute set to <code>#</code>.");'
+    testString: assert($("a").children("img").length > 0, 'Nest the existing <code>img</code> element within an <code>a</code> element.');
+  - text: Your <code>a</code> element should be a dead link with a <code>href</code> attribute set to <code>#</code>.
+    testString: assert(new RegExp("#").test($("a").children("img").parent().attr("href")), 'Your <code>a</code> element should be a dead link with a <code>href</code> attribute set to <code>#</code>.');
   - text: Make sure each of your <code>a</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/a>/g) && code.match(/<a/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length, "Make sure each of your <code>a</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/a>/g) && code.match(/<a/g) && code.match(/<\/a>/g).length === code.match(/<a/g).length, 'Make sure each of your <code>a</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/uncomment-html.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/uncomment-html.english.md
index a6cd9185b9..33111a5c4a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/uncomment-html.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/uncomment-html.english.md
@@ -23,13 +23,13 @@ Uncomment your <code>h1</code>, <code>h2</code> and <code>p</code> elements.
 ```yml
 tests:
   - text: Make your <code>h1</code> element visible on your page by uncommenting it.
-    testString: 'assert($("h1").length > 0, "Make your <code>h1</code> element visible on your page by uncommenting it.");'
+    testString: assert($("h1").length > 0, 'Make your <code>h1</code> element visible on your page by uncommenting it.');
   - text: Make your <code>h2</code> element visible on your page by uncommenting it.
-    testString: 'assert($("h2").length > 0, "Make your <code>h2</code> element visible on your page by uncommenting it.");'
+    testString: assert($("h2").length > 0, 'Make your <code>h2</code> element visible on your page by uncommenting it.');
   - text: Make your <code>p</code> element visible on your page by uncommenting it.
-    testString: 'assert($("p").length > 0, "Make your <code>p</code> element visible on your page by uncommenting it.");'
-  - text: 'Be sure to delete all trailing comment tags&#44; i.e. <code>--&#62;</code>.'
-    testString: 'assert(!/[^fc]-->/gi.test(code.replace(/ *<!--[^fc]*\n/g,"")), "Be sure to delete all trailing comment tags&#44; i.e. <code>--&#62;</code>.");'
+    testString: assert($("p").length > 0, 'Make your <code>p</code> element visible on your page by uncommenting it.');
+  - text: Be sure to delete all trailing comment tags&#44; i.e. <code>--&#62;</code>.
+    testString: assert(!/[^fc]-->/gi.test(code.replace(/ *<!--[^fc]*\n/g,'')), 'Be sure to delete all trailing comment tags&#44; i.e. <code>--&#62;</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md
index 114d7338ff..8ca4428dd2 100644
--- a/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/use-html5-to-require-a-field.english.md
@@ -23,7 +23,7 @@ Then try to submit the form without inputting any text. See how your HTML5 form
 ```yml
 tests:
   - text: Your text <code>input</code> element should have the <code>required</code> attribute.
-    testString: 'assert($("input").prop("required"), "Your text <code>input</code> element should have the <code>required</code> attribute.");'
+    testString: assert($("input").prop("required"), 'Your text <code>input</code> element should have the <code>required</code> attribute.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/add-flex-superpowers-to-the-tweet-embed.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/add-flex-superpowers-to-the-tweet-embed.english.md
index f9bd88a103..dbc45c3f83 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/add-flex-superpowers-to-the-tweet-embed.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/add-flex-superpowers-to-the-tweet-embed.english.md
@@ -22,19 +22,19 @@ Add the CSS property <code>display: flex</code> to all of the following items -
 ```yml
 tests:
   - text: Your <code>header</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($("header").css("display") == "flex", "Your <code>header</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('header').css('display') == 'flex', 'Your <code>header</code> should have a <code>display</code> property set to flex.');
   - text: Your <code>footer</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($("footer").css("display") == "flex", "Your <code>footer</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('footer').css('display') == 'flex', 'Your <code>footer</code> should have a <code>display</code> property set to flex.');
   - text: Your <code>h3</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($("h3").css("display") == "flex", "Your <code>h3</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('h3').css('display') == 'flex', 'Your <code>h3</code> should have a <code>display</code> property set to flex.');
   - text: Your <code>h4</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($("h4").css("display") == "flex", "Your <code>h4</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('h4').css('display') == 'flex', 'Your <code>h4</code> should have a <code>display</code> property set to flex.');
   - text: Your <code>.profile-name</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($(".profile-name").css("display") == "flex", "Your <code>.profile-name</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('.profile-name').css('display') == 'flex', 'Your <code>.profile-name</code> should have a <code>display</code> property set to flex.');
   - text: Your <code>.follow-btn</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($(".follow-btn").css("display") == "flex", "Your <code>.follow-btn</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('.follow-btn').css('display') == 'flex', 'Your <code>.follow-btn</code> should have a <code>display</code> property set to flex.');
   - text: Your <code>.stats</code> should have a <code>display</code> property set to flex.
-    testString: 'assert($(".stats").css("display") == "flex", "Your <code>.stats</code> should have a <code>display</code> property set to flex.");'
+    testString: assert($('.stats').css('display') == 'flex', 'Your <code>.stats</code> should have a <code>display</code> property set to flex.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-align-items-property.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-align-items-property.english.md
index a809d654de..4c439046f4 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-align-items-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-align-items-property.english.md
@@ -25,8 +25,8 @@ An example helps show this property in action. Add the CSS property <code>align-
 
 ```yml
 tests:
-  - text: 'The <code>#box-container</code> element should have an <code>align-items</code> property set to a value of center.'
-    testString: 'assert($("#box-container").css("align-items") == "center", "The <code>#box-container</code> element should have an <code>align-items</code> property set to a value of center.");'
+  - text: The <code>#box-container</code> element should have an <code>align-items</code> property set to a value of center.
+    testString: assert($('#box-container').css('align-items') == 'center', 'The <code>#box-container</code> element should have an <code>align-items</code> property set to a value of center.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-justify-content-property.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-justify-content-property.english.md
index 95e9a61d76..05dfd907bb 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-justify-content-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/align-elements-using-the-justify-content-property.english.md
@@ -25,8 +25,8 @@ An example helps show this property in action. Add the CSS property <code>justif
 
 ```yml
 tests:
-  - text: 'The <code>#box-container</code> element should have a <code>justify-content</code> property set to a value of center.'
-    testString: 'assert($("#box-container").css("justify-content") == "center", "The <code>#box-container</code> element should have a <code>justify-content</code> property set to a value of center.");'
+  - text: The <code>#box-container</code> element should have a <code>justify-content</code> property set to a value of center.
+    testString: assert($('#box-container').css('justify-content') == 'center', 'The <code>#box-container</code> element should have a <code>justify-content</code> property set to a value of center.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-a-column-in-the-tweet-embed.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-a-column-in-the-tweet-embed.english.md
index c71fface43..011306cac6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-a-column-in-the-tweet-embed.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-a-column-in-the-tweet-embed.english.md
@@ -21,7 +21,7 @@ Add the CSS property <code>flex-direction</code> to the header's <code>.profile-
 ```yml
 tests:
   - text: The <code>.profile-name</code> element should have a <code>flex-direction</code> property set to column.
-    testString: 'assert($(".profile-name").css("flex-direction") == "column", "The <code>.profile-name</code> element should have a <code>flex-direction</code> property set to column.");'
+    testString: assert($('.profile-name').css('flex-direction') == 'column', 'The <code>.profile-name</code> element should have a <code>flex-direction</code> property set to column.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-rows-in-the-tweet-embed.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-rows-in-the-tweet-embed.english.md
index 7ec7bdc6d4..844b419254 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-rows-in-the-tweet-embed.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/apply-the-flex-direction-property-to-create-rows-in-the-tweet-embed.english.md
@@ -21,9 +21,9 @@ Add the CSS property <code>flex-direction</code> to both the <code>header</code>
 ```yml
 tests:
   - text: The <code>header</code> should have a <code>flex-direction</code> property set to row.
-    testString: 'assert(code.match(/header\s*?{[^}]*?flex-direction:\s*?row;/g), "The <code>header</code> should have a <code>flex-direction</code> property set to row.");'
+    testString: assert(code.match(/header\s*?{[^}]*?flex-direction:\s*?row;/g), 'The <code>header</code> should have a <code>flex-direction</code> property set to row.');
   - text: The <code>footer</code> should have a <code>flex-direction</code> property set to row.
-    testString: 'assert(code.match(/footer\s*?{[^}]*?flex-direction:\s*?row;/g), "The <code>footer</code> should have a <code>flex-direction</code> property set to row.");'
+    testString: assert(code.match(/footer\s*?{[^}]*?flex-direction:\s*?row;/g), 'The <code>footer</code> should have a <code>flex-direction</code> property set to row.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-display-flex-to-position-two-boxes.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-display-flex-to-position-two-boxes.english.md
index c2209b0fd9..0120f16bc5 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-display-flex-to-position-two-boxes.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-display-flex-to-position-two-boxes.english.md
@@ -21,8 +21,8 @@ Add the CSS property <code>display</code> to <code>#box-container</code> and set
 
 ```yml
 tests:
-  - text: '<code>#box-container</code> should have the <code>display</code> property set to a value of flex.'
-    testString: 'assert($("#box-container").css("display") == "flex", "<code>#box-container</code> should have the <code>display</code> property set to a value of flex.");'
+  - text: <code>#box-container</code> should have the <code>display</code> property set to a value of flex.
+    testString: assert($('#box-container').css('display') == 'flex', '<code>#box-container</code> should have the <code>display</code> property set to a value of flex.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-items-property-in-the-tweet-embed.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-items-property-in-the-tweet-embed.english.md
index 46dbd763e5..87a00f1ebe 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-items-property-in-the-tweet-embed.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-items-property-in-the-tweet-embed.english.md
@@ -21,7 +21,7 @@ Add the CSS property <code>align-items</code> to the header's <code>.follow-btn<
 ```yml
 tests:
   - text: The <code>.follow-btn</code> element should have the <code>align-items</code> property set to a value of center.
-    testString: 'assert($(".follow-btn").css("align-items") == "center", "The <code>.follow-btn</code> element should have the <code>align-items</code> property set to a value of center.");'
+    testString: assert($('.follow-btn').css('align-items') == 'center', 'The <code>.follow-btn</code> element should have the <code>align-items</code> property set to a value of center.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-self-property.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-self-property.english.md
index 0fc6127d20..24cc0e79c6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-self-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-self-property.english.md
@@ -21,10 +21,10 @@ Add the CSS property <code>align-self</code> to both <code>#box-1</code> and <co
 
 ```yml
 tests:
-  - text: 'The <code>#box-1</code> element should have the <code>align-self</code> property set to a value of center.'
-    testString: 'assert($("#box-1").css("align-self") == "center", "The <code>#box-1</code> element should have the <code>align-self</code> property set to a value of center.");'
-  - text: 'The <code>#box-2</code> element should have the <code>align-self</code> property set to a value of flex-end.'
-    testString: 'assert($("#box-2").css("align-self") == "flex-end", "The <code>#box-2</code> element should have the <code>align-self</code> property set to a value of flex-end.");'
+  - text: The <code>#box-1</code> element should have the <code>align-self</code> property set to a value of center.
+    testString: assert($('#box-1').css('align-self') == 'center', 'The <code>#box-1</code> element should have the <code>align-self</code> property set to a value of center.');
+  - text: The <code>#box-2</code> element should have the <code>align-self</code> property set to a value of flex-end.
+    testString: assert($('#box-2').css('align-self') == 'flex-end', 'The <code>#box-2</code> element should have the <code>align-self</code> property set to a value of flex-end.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-basis-property-to-set-the-initial-size-of-an-item.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-basis-property-to-set-the-initial-size-of-an-item.english.md
index e9e3865b25..aa76c6745a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-basis-property-to-set-the-initial-size-of-an-item.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-basis-property-to-set-the-initial-size-of-an-item.english.md
@@ -21,14 +21,14 @@ Set the initial size of the boxes using <code>flex-basis</code>. Add the CSS pro
 
 ```yml
 tests:
-  - text: 'The <code>#box-1</code> element should have a <code>flex-basis</code> property.'
-    testString: 'assert($("#box-1").css("flex-basis") != "auto", "The <code>#box-1</code> element should have a <code>flex-basis</code> property.");'
-  - text: 'The <code>#box-1</code> element should have a <code>flex-basis</code> value of <code>10em</code>.'
-    testString: 'assert(code.match(/#box-1\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?10em;/g), "The <code>#box-1</code> element should have a <code>flex-basis</code> value of <code>10em</code>.");'
-  - text: 'The <code>#box-2</code> element should have the <code>flex-basis</code> property.'
-    testString: 'assert($("#box-2").css("flex-basis") != "auto", "The <code>#box-2</code> element should have the <code>flex-basis</code> property.");'
-  - text: 'The <code>#box-2</code> element should have a <code>flex-basis</code> value of <code>20em</code>.'
-    testString: 'assert(code.match(/#box-2\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?20em;/g), "The <code>#box-2</code> element should have a <code>flex-basis</code> value of <code>20em</code>.");'
+  - text: The <code>#box-1</code> element should have a <code>flex-basis</code> property.
+    testString: assert($('#box-1').css('flex-basis') != 'auto', 'The <code>#box-1</code> element should have a <code>flex-basis</code> property.');
+  - text: The <code>#box-1</code> element should have a <code>flex-basis</code> value of <code>10em</code>.
+    testString: assert(code.match(/#box-1\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?10em;/g), 'The <code>#box-1</code> element should have a <code>flex-basis</code> value of <code>10em</code>.');
+  - text: The <code>#box-2</code> element should have the <code>flex-basis</code> property.
+    testString: assert($('#box-2').css('flex-basis') != 'auto', 'The <code>#box-2</code> element should have the <code>flex-basis</code> property.');
+  - text: The <code>#box-2</code> element should have a <code>flex-basis</code> value of <code>20em</code>.
+    testString: assert(code.match(/#box-2\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?20em;/g), 'The <code>#box-2</code> element should have a <code>flex-basis</code> value of <code>20em</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-column.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-column.english.md
index 051d2cb3d1..305d901694 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-column.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-column.english.md
@@ -20,8 +20,8 @@ Add the CSS property <code>flex-direction</code> to the <code>#box-container</co
 
 ```yml
 tests:
-  - text: 'The <code>#box-container</code> element should have a <code>flex-direction</code> property set to column.'
-    testString: 'assert($("#box-container").css("flex-direction") == "column", "The <code>#box-container</code> element should have a <code>flex-direction</code> property set to column.");'
+  - text: The <code>#box-container</code> element should have a <code>flex-direction</code> property set to column.
+    testString: assert($('#box-container').css('flex-direction') == 'column', 'The <code>#box-container</code> element should have a <code>flex-direction</code> property set to column.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-row.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-row.english.md
index 3e167e7b76..847e3ccdaf 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-row.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-row.english.md
@@ -22,8 +22,8 @@ Add the CSS property <code>flex-direction</code> to the <code>#box-container</co
 
 ```yml
 tests:
-  - text: 'The <code>#box-container</code> element should have a <code>flex-direction</code> property set to row-reverse.'
-    testString: 'assert($("#box-container").css("flex-direction") == "row-reverse", "The <code>#box-container</code> element should have a <code>flex-direction</code> property set to row-reverse.");'
+  - text: The <code>#box-container</code> element should have a <code>flex-direction</code> property set to row-reverse.
+    testString: assert($('#box-container').css('flex-direction') == 'row-reverse', 'The <code>#box-container</code> element should have a <code>flex-direction</code> property set to row-reverse.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-grow-property-to-expand-items.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-grow-property-to-expand-items.english.md
index da16c49309..00b724dab7 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-grow-property-to-expand-items.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-grow-property-to-expand-items.english.md
@@ -21,10 +21,10 @@ Add the CSS property <code>flex-grow</code> to both <code>#box-1</code> and <cod
 
 ```yml
 tests:
-  - text: 'The <code>#box-1</code> element should have the <code>flex-grow</code> property set to a value of 1.'
-    testString: 'assert($("#box-1").css("flex-grow") == "1", "The <code>#box-1</code> element should have the <code>flex-grow</code> property set to a value of 1.");'
-  - text: 'The <code>#box-2</code> element should have the <code>flex-grow</code> property set to a value of 2.'
-    testString: 'assert($("#box-2").css("flex-grow") == "2", "The <code>#box-2</code> element should have the <code>flex-grow</code> property set to a value of 2.");'
+  - text: The <code>#box-1</code> element should have the <code>flex-grow</code> property set to a value of 1.
+    testString: assert($('#box-1').css('flex-grow') == '1', 'The <code>#box-1</code> element should have the <code>flex-grow</code> property set to a value of 1.');
+  - text: The <code>#box-2</code> element should have the <code>flex-grow</code> property set to a value of 2.
+    testString: assert($('#box-2').css('flex-grow') == '2', 'The <code>#box-2</code> element should have the <code>flex-grow</code> property set to a value of 2.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shorthand-property.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shorthand-property.english.md
index 6717299fd7..4f3b92edfe 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shorthand-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shorthand-property.english.md
@@ -23,12 +23,12 @@ These values will cause <code>#box-1</code> to grow to fill the extra space at t
 
 ```yml
 tests:
-  - text: 'The <code>#box-1</code> element should have the <code>flex</code> property set to a value of 2 2 150px.'
-    testString: 'assert($("#box-1").css("flex-grow") == "2" && $("#box-1").css("flex-shrink") == "2" && $("#box-1").css("flex-basis") == "150px", "The <code>#box-1</code> element should have the <code>flex</code> property set to a value of 2 2 150px.");'
-  - text: 'The <code>#box-2</code> element should have the <code>flex</code> property set to a value of 1 1 150px.'
-    testString: 'assert($("#box-2").css("flex-grow") == "1" && $("#box-2").css("flex-shrink") == "1" && $("#box-2").css("flex-basis") == "150px", "The <code>#box-2</code> element should have the <code>flex</code> property set to a value of 1 1 150px.");'
-  - text: 'Your code should use the <code>flex</code> property for <code>#box-1</code> and <code>#box-2</code>.'
-    testString: 'assert(code.match(/flex:\s*?\d\s+?\d\s+?150px;/g).length == 2, "Your code should use the <code>flex</code> property for <code>#box-1</code> and <code>#box-2</code>.");'
+  - text: The <code>#box-1</code> element should have the <code>flex</code> property set to a value of 2 2 150px.
+    testString: assert($('#box-1').css('flex-grow') == '2' && $('#box-1').css('flex-shrink') == '2' && $('#box-1').css('flex-basis') == '150px', 'The <code>#box-1</code> element should have the <code>flex</code> property set to a value of 2 2 150px.');
+  - text: The <code>#box-2</code> element should have the <code>flex</code> property set to a value of 1 1 150px.
+    testString: assert($('#box-2').css('flex-grow') == '1' && $('#box-2').css('flex-shrink') == '1' && $('#box-2').css('flex-basis') == '150px', 'The <code>#box-2</code> element should have the <code>flex</code> property set to a value of 1 1 150px.');
+  - text: Your code should use the <code>flex</code> property for <code>#box-1</code> and <code>#box-2</code>.
+    testString: assert(code.match(/flex:\s*?\d\s+?\d\s+?150px;/g).length == 2, 'Your code should use the <code>flex</code> property for <code>#box-1</code> and <code>#box-2</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shrink-property-to-shrink-items.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shrink-property-to-shrink-items.english.md
index d492f09d40..e2282d9aa6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shrink-property-to-shrink-items.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-shrink-property-to-shrink-items.english.md
@@ -22,10 +22,10 @@ Add the CSS property <code>flex-shrink</code> to both <code>#box-1</code> and <c
 
 ```yml
 tests:
-  - text: 'The <code>#box-1</code> element should have the <code>flex-shrink</code> property set to a value of 1.'
-    testString: 'assert($("#box-1").css("flex-shrink") == "1", "The <code>#box-1</code> element should have the <code>flex-shrink</code> property set to a value of 1.");'
-  - text: 'The <code>#box-2</code> element should have the <code>flex-shrink</code> property set to a value of 2.'
-    testString: 'assert($("#box-2").css("flex-shrink") == "2", "The <code>#box-2</code> element should have the <code>flex-shrink</code> property set to a value of 2.");'
+  - text: The <code>#box-1</code> element should have the <code>flex-shrink</code> property set to a value of 1.
+    testString: assert($('#box-1').css('flex-shrink') == '1', 'The <code>#box-1</code> element should have the <code>flex-shrink</code> property set to a value of 1.');
+  - text: The <code>#box-2</code> element should have the <code>flex-shrink</code> property set to a value of 2.
+    testString: assert($('#box-2').css('flex-shrink') == '2', 'The <code>#box-2</code> element should have the <code>flex-shrink</code> property set to a value of 2.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-wrap-property-to-wrap-a-row-or-column.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-wrap-property-to-wrap-a-row-or-column.english.md
index b789fc4c70..b10729a3aa 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-wrap-property-to-wrap-a-row-or-column.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-flex-wrap-property-to-wrap-a-row-or-column.english.md
@@ -23,8 +23,8 @@ The current layout has too many boxes for one row. Add the CSS property <code>fl
 
 ```yml
 tests:
-  - text: 'The <code>#box-container</code> element should have the <code>flex-wrap</code> property set to a value of wrap.'
-    testString: 'assert($("#box-container").css("flex-wrap") == "wrap", "The <code>#box-container</code> element should have the <code>flex-wrap</code> property set to a value of wrap.");'
+  - text: The <code>#box-container</code> element should have the <code>flex-wrap</code> property set to a value of wrap.
+    testString: assert($('#box-container').css('flex-wrap') == 'wrap', 'The <code>#box-container</code> element should have the <code>flex-wrap</code> property set to a value of wrap.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-justify-content-property-in-the-tweet-embed.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-justify-content-property-in-the-tweet-embed.english.md
index 07eb83ad5d..b59820564f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-justify-content-property-in-the-tweet-embed.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-justify-content-property-in-the-tweet-embed.english.md
@@ -21,7 +21,7 @@ Add the CSS property <code>justify-content</code> to the header's <code>.profile
 ```yml
 tests:
   - text: 'The <code>.profile-name</code> element should have the <code>justify-content</code> property set to any of these values: center, flex-start, flex-end, space-between, or space-around.'
-    testString: 'assert(code.match(/header\s.profile-name\s*{\s*?.*?\s*?.*?\s*?\s*?.*?\s*?justify-content\s*:\s*(center|flex-start|flex-end|space-between|space-around)\s*;/g), "The <code>.profile-name</code> element should have the <code>justify-content</code> property set to any of these values: center, flex-start, flex-end, space-between, or space-around.");'
+    testString: 'assert(code.match(/header\s.profile-name\s*{\s*?.*?\s*?.*?\s*?\s*?.*?\s*?justify-content\s*:\s*(center|flex-start|flex-end|space-between|space-around)\s*;/g), ''The <code>.profile-name</code> element should have the <code>justify-content</code> property set to any of these values: center, flex-start, flex-end, space-between, or space-around.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-order-property-to-rearrange-items.english.md b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-order-property-to-rearrange-items.english.md
index 7833db6014..3c7e2de754 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-order-property-to-rearrange-items.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-order-property-to-rearrange-items.english.md
@@ -20,10 +20,10 @@ Add the CSS property <code>order</code> to both <code>#box-1</code> and <code>#b
 
 ```yml
 tests:
-  - text: 'The <code>#box-1</code> element should have the <code>order</code> property set to a value of 2.'
-    testString: 'assert($("#box-1").css("order") == "2", "The <code>#box-1</code> element should have the <code>order</code> property set to a value of 2.");'
-  - text: 'The <code>#box-2</code> element should have the <code>order</code> property set to a value of 1.'
-    testString: 'assert($("#box-2").css("order") == "1", "The <code>#box-2</code> element should have the <code>order</code> property set to a value of 1.");'
+  - text: The <code>#box-1</code> element should have the <code>order</code> property set to a value of 2.
+    testString: assert($('#box-1').css('order') == '2', 'The <code>#box-1</code> element should have the <code>order</code> property set to a value of 2.');
+  - text: The <code>#box-2</code> element should have the <code>order</code> property set to a value of 1.
+    testString: assert($('#box-2').css('order') == '1', 'The <code>#box-2</code> element should have the <code>order</code> property set to a value of 1.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/add-columns-with-grid-template-columns.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/add-columns-with-grid-template-columns.english.md
index 4881f9f046..e4b6d42846 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/add-columns-with-grid-template-columns.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/add-columns-with-grid-template-columns.english.md
@@ -24,7 +24,7 @@ Give the grid container three columns that are <code>100px</code> wide each.
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-template-columns</code> property with three units of <code>100px</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?100px\s*?100px\s*?100px\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-columns</code> property with three units of <code>100px</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?100px\s*?100px\s*?100px\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-template-columns</code> property with three units of <code>100px</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/add-gaps-faster-with-grid-gap.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/add-gaps-faster-with-grid-gap.english.md
index 56d8489e3d..7eefbe9bc9 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/add-gaps-faster-with-grid-gap.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/add-gaps-faster-with-grid-gap.english.md
@@ -21,7 +21,7 @@ Use <code>grid-gap</code> to introduce a <code>10px</code> gap between the rows
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-gap</code> property that introduces <code>10px</code> gap between the rows and <code>20px</code> gap between the columns.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-gap\s*?:\s*?10px\s+?20px\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-gap</code> property that introduces <code>10px</code> gap between the rows and <code>20px</code> gap between the columns.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-gap\s*?:\s*?10px\s+?20px\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-gap</code> property that introduces <code>10px</code> gap between the rows and <code>20px</code> gap between the columns.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/add-rows-with-grid-template-rows.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/add-rows-with-grid-template-rows.english.md
index 78a33b0f27..6d1f95292f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/add-rows-with-grid-template-rows.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/add-rows-with-grid-template-rows.english.md
@@ -21,7 +21,7 @@ Add two rows to the grid that are <code>50px</code> tall each.
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-template-rows</code> property with two units of <code>50px</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-rows\s*?:\s*?50px\s*?50px\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-rows</code> property with two units of <code>50px</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-rows\s*?:\s*?50px\s*?50px\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-template-rows</code> property with two units of <code>50px</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-horizontally-using-justify-items.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-horizontally-using-justify-items.english.md
index 54db05bece..18cad37984 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-horizontally-using-justify-items.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-horizontally-using-justify-items.english.md
@@ -21,7 +21,7 @@ Use this property to center all our items horizontally.
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>justify-items</code> property that has the value of <code>center</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*justify-items\s*?:\s*?center\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>justify-items</code> property that has the value of <code>center</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*justify-items\s*?:\s*?center\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>justify-items</code> property that has the value of <code>center</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-vertically-using-align-items.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-vertically-using-align-items.english.md
index 1cb2edb9b3..ff1280affd 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-vertically-using-align-items.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-all-items-vertically-using-align-items.english.md
@@ -21,7 +21,7 @@ Use it now to move all the items to the end of each cell.
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>align-items</code> property that has the value of <code>end</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*align-items\s*?:\s*?end\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>align-items</code> property that has the value of <code>end</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*align-items\s*?:\s*?end\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>align-items</code> property that has the value of <code>end</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-horizontally-using-justify-self.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-horizontally-using-justify-self.english.md
index 8e8919e129..74709cef3d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-horizontally-using-justify-self.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-horizontally-using-justify-self.english.md
@@ -24,7 +24,7 @@ Use the <code>justify-self</code> property to center the item with the class <co
 ```yml
 tests:
   - text: <code>item2</code> class should have a <code>justify-self</code> property that has the value of <code>center</code>.
-    testString: 'assert(code.match(/.item2\s*?{[\s\S]*justify-self\s*?:\s*?center\s*?;[\s\S]*}/gi), "<code>item2</code> class should have a <code>justify-self</code> property that has the value of <code>center</code>.");'
+    testString: assert(code.match(/.item2\s*?{[\s\S]*justify-self\s*?:\s*?center\s*?;[\s\S]*}/gi), '<code>item2</code> class should have a <code>justify-self</code> property that has the value of <code>center</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-vertically-using-align-self.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-vertically-using-align-self.english.md
index cc42a8d7d3..72bbcc2efc 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-vertically-using-align-self.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/align-an-item-vertically-using-align-self.english.md
@@ -21,7 +21,7 @@ Align the item with the class <code>item3</code> vertically at the <code>end</co
 ```yml
 tests:
   - text: <code>item3</code> class should have a <code>align-self</code> property that has the value of <code>end</code>.
-    testString: 'assert(code.match(/.item3\s*?{[\s\S]*align-self\s*?:\s*?end\s*?;[\s\S]*}/gi), "<code>item3</code> class should have a <code>align-self</code> property that has the value of <code>end</code>.");'
+    testString: assert(code.match(/.item3\s*?{[\s\S]*align-self\s*?:\s*?end\s*?;[\s\S]*}/gi), '<code>item3</code> class should have a <code>align-self</code> property that has the value of <code>end</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-column-gap-using-grid-column-gap.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-column-gap-using-grid-column-gap.english.md
index 0ea036c32b..7349b3b2a2 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-column-gap-using-grid-column-gap.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-column-gap-using-grid-column-gap.english.md
@@ -23,7 +23,7 @@ Give the columns in the grid a <code>20px</code> gap.
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-column-gap</code> property that has the value of <code>20px</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-column-gap\s*?:\s*?20px\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-column-gap</code> property that has the value of <code>20px</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-column-gap\s*?:\s*?20px\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-column-gap</code> property that has the value of <code>20px</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-row-gap-using-grid-row-gap.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-row-gap-using-grid-row-gap.english.md
index bdccbd47ff..b697f6a64d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-row-gap-using-grid-row-gap.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-a-row-gap-using-grid-row-gap.english.md
@@ -21,7 +21,7 @@ Create a gap for the rows that is <code>5px</code> tall.
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-row-gap</code> property that has the value of <code>5px</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-row-gap\s*?:\s*?5px\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-row-gap</code> property that has the value of <code>5px</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-row-gap\s*?:\s*?5px\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-row-gap</code> property that has the value of <code>5px</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fill.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fill.english.md
index ad5c31a6af..9feadb4e6a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fill.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fill.english.md
@@ -25,7 +25,7 @@ In the first grid, use <code>auto-fill</code> with <code>repeat</code> to fill t
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-template-columns</code> property with <code>repeat</code> and <code>auto-fill</code> that will fill the grid with columns that have a minimum width of <code>60px</code> and maximum of <code>1fr</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?auto-fill\s*?,\s*?minmax\s*?\(\s*?60px\s*?,\s*?1fr\s*?\)\s*?\)\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-columns</code> property with <code>repeat</code> and <code>auto-fill</code> that will fill the grid with columns that have a minimum width of <code>60px</code> and maximum of <code>1fr</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?auto-fill\s*?,\s*?minmax\s*?\(\s*?60px\s*?,\s*?1fr\s*?\)\s*?\)\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-template-columns</code> property with <code>repeat</code> and <code>auto-fill</code> that will fill the grid with columns that have a minimum width of <code>60px</code> and maximum of <code>1fr</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fit.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fit.english.md
index c8033ef9d7..37c9d7fbb1 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fit.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-flexible-layouts-using-auto-fit.english.md
@@ -22,7 +22,7 @@ In the second grid, use <code>auto-fit</code> with <code>repeat</code> to fill t
 ```yml
 tests:
   - text: <code>container2</code> class should have a <code>grid-template-columns</code> property with <code>repeat</code> and <code>auto-fit</code> that will fill the grid with columns that have a minimum width of <code>60px</code> and maximum of <code>1fr</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?auto-fit\s*?,\s*?minmax\s*?\(\s*?60px\s*?,\s*?1fr\s*?\)\s*?\)\s*?;[\s\S]*}/gi), "<code>container2</code> class should have a <code>grid-template-columns</code> property with <code>repeat</code> and <code>auto-fit</code> that will fill the grid with columns that have a minimum width of <code>60px</code> and maximum of <code>1fr</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?auto-fit\s*?,\s*?minmax\s*?\(\s*?60px\s*?,\s*?1fr\s*?\)\s*?\)\s*?;[\s\S]*}/gi), '<code>container2</code> class should have a <code>grid-template-columns</code> property with <code>repeat</code> and <code>auto-fit</code> that will fill the grid with columns that have a minimum width of <code>60px</code> and maximum of <code>1fr</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-grids-within-grids.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-grids-within-grids.english.md
index 15f90c7211..2fb5ed8b63 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-grids-within-grids.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-grids-within-grids.english.md
@@ -22,9 +22,9 @@ Turn the element with the <code>item3</code> class into a grid with two columns
 ```yml
 tests:
   - text: <code>item3</code> class should have a <code>grid-template-columns</code> property with <code>auto</code> and <code>1fr</code> as values.
-    testString: 'assert(code.match(/.item3\s*?{[\s\S]*grid-template-columns\s*?:\s*?auto\s*?1fr\s*?;[\s\S]*}/gi), "<code>item3</code> class should have a <code>grid-template-columns</code> property with <code>auto</code> and <code>1fr</code> as values.");'
+    testString: assert(code.match(/.item3\s*?{[\s\S]*grid-template-columns\s*?:\s*?auto\s*?1fr\s*?;[\s\S]*}/gi), '<code>item3</code> class should have a <code>grid-template-columns</code> property with <code>auto</code> and <code>1fr</code> as values.');
   - text: <code>item3</code> class should have a <code>display</code> property with the value of <code>grid</code>.
-    testString: 'assert(code.match(/.item3\s*?{[\s\S]*display\s*?:\s*?grid\s*?;[\s\S]*}/gi), "<code>item3</code> class should have a <code>display</code> property with the value of <code>grid</code>.");'
+    testString: assert(code.match(/.item3\s*?{[\s\S]*display\s*?:\s*?grid\s*?;[\s\S]*}/gi), '<code>item3</code> class should have a <code>display</code> property with the value of <code>grid</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-your-first-css-grid.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-your-first-css-grid.english.md
index dc92fe1d37..62e47e39db 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/create-your-first-css-grid.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/create-your-first-css-grid.english.md
@@ -22,7 +22,7 @@ Change the display of the div with the <code>container</code> class to <code>gri
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>display</code> property with a value of <code>grid</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*display\s*?:\s*?grid\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>display</code> property with a value of <code>grid</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*display\s*?:\s*?grid\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>display</code> property with a value of <code>grid</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/divide-the-grid-into-an-area-template.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/divide-the-grid-into-an-area-template.english.md
index c24ddd1d76..7877db6b4f 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/divide-the-grid-into-an-area-template.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/divide-the-grid-into-an-area-template.english.md
@@ -25,7 +25,7 @@ Place the area template so that the cell labeled <code>advert</code> becomes an
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-template-areas</code> property similar to the preview but has <code>.</code> instead of the <code>advert</code> area.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-areas\s*?:\s*?"\s*?header\s*?header\s*?header\s*?"\s*?"\s*?.\s*?content\s*?content\s*?"\s*?"\s*?footer\s*?footer\s*?footer\s*?"\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-areas</code> propertiy similar to the preview but has <code>.</code> instead of the <code>advert</code> area.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-areas\s*?:\s*?"\s*?header\s*?header\s*?header\s*?"\s*?"\s*?.\s*?content\s*?content\s*?"\s*?"\s*?footer\s*?footer\s*?footer\s*?"\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-template-areas</code> propertiy similar to the preview but has <code>.</code> instead of the <code>advert</code> area.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/limit-item-size-using-the-minmax-function.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/limit-item-size-using-the-minmax-function.english.md
index f045c8e2b9..e989e65fed 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/limit-item-size-using-the-minmax-function.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/limit-item-size-using-the-minmax-function.english.md
@@ -23,7 +23,7 @@ Using the <code>minmax</code> function, replace the <code>1fr</code> in the <cod
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-template-columns</code> property that is set to repeat 3 columns with the minimum width of <code>90px</code> and maximum width of <code>1fr</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?3\s*?,\s*?minmax\s*?\(\s*?90px\s*?,\s*?1fr\s*?\)\s*?\)\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-columns</code> property that is set to repeat 3 columns with the minimum width of <code>90px</code> and maximum width of <code>1fr</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?3\s*?,\s*?minmax\s*?\(\s*?90px\s*?,\s*?1fr\s*?\)\s*?\)\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-template-columns</code> property that is set to repeat 3 columns with the minimum width of <code>90px</code> and maximum width of <code>1fr</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/place-items-in-grid-areas-using-the-grid-area-property.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/place-items-in-grid-areas-using-the-grid-area-property.english.md
index 405b795837..8bac0c1d8a 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/place-items-in-grid-areas-using-the-grid-area-property.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/place-items-in-grid-areas-using-the-grid-area-property.english.md
@@ -23,7 +23,7 @@ Place an element with the <code>item5</code> class in the <code>footer</code> ar
 ```yml
 tests:
   - text: <code>item5</code> class should have a <code>grid-area</code> property that has the value of <code>footer</code>.
-    testString: 'assert(code.match(/.item5\s*?{[\s\S]*grid-area\s*?:\s*?footer\s*?;[\s\S]*}/gi), "<code>item5</code> class should have a <code>grid-area</code> property that has the value of <code>footer</code>.");'
+    testString: assert(code.match(/.item5\s*?{[\s\S]*grid-area\s*?:\s*?footer\s*?;[\s\S]*}/gi), '<code>item5</code> class should have a <code>grid-area</code> property that has the value of <code>footer</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/reduce-repetition-using-the-repeat-function.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/reduce-repetition-using-the-repeat-function.english.md
index f915ab2d31..e29cfe680c 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/reduce-repetition-using-the-repeat-function.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/reduce-repetition-using-the-repeat-function.english.md
@@ -29,7 +29,7 @@ Use <code>repeat</code> to remove repetition from the <code>grid-template-column
 ```yml
 tests:
   - text: <code>container</code> class should have a <code>grid-template-columns</code> property that is set to repeat 3 columns with the width of <code>1fr</code>.
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?3\s*?,\s*?1fr\s*?\)\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-columns</code> property that is set to repeat 3 columns with the width of <code>1fr</code>.");'
+    testString: assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?repeat\s*?\(\s*?3\s*?,\s*?1fr\s*?\)\s*?;[\s\S]*}/gi), '<code>container</code> class should have a <code>grid-template-columns</code> property that is set to repeat 3 columns with the width of <code>1fr</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-css-grid-units-to-change-the-size-of-columns-and-rows.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-css-grid-units-to-change-the-size-of-columns-and-rows.english.md
index 58bc14ceb4..e6907dfe3d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-css-grid-units-to-change-the-size-of-columns-and-rows.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-css-grid-units-to-change-the-size-of-columns-and-rows.english.md
@@ -27,7 +27,7 @@ Make a grid with three columns whose widths are as follows: 1fr, 100px, and 2fr.
 ```yml
 tests:
   - text: '<code>container</code> class should have a <code>grid-template-columns</code> property that has three columns with the following widths: <code>1fr, 100px, and 2fr</code>.'
-    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?1fr\s*?100px\s*?2fr\s*?;[\s\S]*}/gi), "<code>container</code> class should have a <code>grid-template-columns</code> property that has three columns with the following widths: <code>1fr, 100px, and 2fr</code>.");'
+    testString: 'assert(code.match(/.container\s*?{[\s\S]*grid-template-columns\s*?:\s*?1fr\s*?100px\s*?2fr\s*?;[\s\S]*}/gi), ''<code>container</code> class should have a <code>grid-template-columns</code> property that has three columns with the following widths: <code>1fr, 100px, and 2fr</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-area-without-creating-an-areas-template.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-area-without-creating-an-areas-template.english.md
index 4153412691..9bdfa688fa 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-area-without-creating-an-areas-template.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-area-without-creating-an-areas-template.english.md
@@ -25,7 +25,7 @@ Using the <code>grid-area</code> property, place the element with <code>item5</c
 ```yml
 tests:
   - text: <code>item5</code> class should have a <code>grid-area</code> property that has the value of <code>3/1/4/4</code>.
-    testString: 'assert(code.match(/.item5\s*?{[\s\S]*grid-area\s*?:\s*?3\s*?\/\s*?1\s*?\/\s*?4\s*?\/\s*?4\s*?;[\s\S]*}/gi), "<code>item5</code> class should have a <code>grid-area</code> property that has the value of <code>3/1/4/4</code>.");'
+    testString: assert(code.match(/.item5\s*?{[\s\S]*grid-area\s*?:\s*?3\s*?\/\s*?1\s*?\/\s*?4\s*?\/\s*?4\s*?;[\s\S]*}/gi), '<code>item5</code> class should have a <code>grid-area</code> property that has the value of <code>3/1/4/4</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-column-to-control-spacing.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-column-to-control-spacing.english.md
index 769d093d05..e6861e45c8 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-column-to-control-spacing.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-column-to-control-spacing.english.md
@@ -28,7 +28,7 @@ Make the item with the class <code>item5</code> consume the last two columns of
 ```yml
 tests:
   - text: <code>item5</code> class should have a <code>grid-column</code> property that has the value of <code>2 / 4</code>.
-    testString: 'assert(code.match(/.item5\s*?{[\s\S]*grid-column\s*?:\s*?2\s*?\/\s*?4\s*?;[\s\S]*}/gi), "<code>item5</code> class should have a <code>grid-column</code> property that has the value of <code>2 / 4</code>.");'
+    testString: assert(code.match(/.item5\s*?{[\s\S]*grid-column\s*?:\s*?2\s*?\/\s*?4\s*?;[\s\S]*}/gi), '<code>item5</code> class should have a <code>grid-column</code> property that has the value of <code>2 / 4</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-row-to-control-spacing.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-row-to-control-spacing.english.md
index 7ccf1871a4..15b19c39b6 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-row-to-control-spacing.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-grid-row-to-control-spacing.english.md
@@ -21,7 +21,7 @@ Make the element with the <code>item5</code> class consume the last two rows.
 ```yml
 tests:
   - text: <code>item5</code> class should have a <code>grid-row</code> property that has the value of <code>2 / 4</code>.
-    testString: 'assert(code.match(/.item5\s*?{[\s\S]*grid-row\s*?:\s*?2\s*?\/\s*?4\s*?;[\s\S]*}/gi), "<code>item5</code> class should have a <code>grid-row</code> property that has the value of <code>2 / 4</code>.");'
+    testString: assert(code.match(/.item5\s*?{[\s\S]*grid-row\s*?:\s*?2\s*?\/\s*?4\s*?;[\s\S]*}/gi), '<code>item5</code> class should have a <code>grid-row</code> property that has the value of <code>2 / 4</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-media-queries-to-create-responsive-layouts.english.md b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-media-queries-to-create-responsive-layouts.english.md
index 9b3bab51a9..cc23fb27a9 100644
--- a/curriculum/challenges/english/01-responsive-web-design/css-grid/use-media-queries-to-create-responsive-layouts.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/css-grid/use-media-queries-to-create-responsive-layouts.english.md
@@ -21,8 +21,8 @@ When the viewport width is <code>400px</code> or more, make the header area occu
 
 ```yml
 tests:
-  - text: 'When the viewport is <code>400px</code> or more, <code>container</code> class should have a <code>grid-template-areas</code> property in which the footer and header areas occupy the top and bottom rows respectively and advert and content occupy the left and right columns of the middle row.'
-    testString: 'assert(code.match(/@media\s*?\(\s*?min-width\s*?:\s*?400px\s*?\)[\s\S]*.container\s*?{[\s\S]*grid-template-areas\s*?:\s*?"\s*?header\s*?header\s*?"\s*?"\s*?advert\s*?content\s*?"\s*?"\s*?footer\s*?footer\s*?"\s*?;[\s\S]*}/gi), "When the viewport is <code>400px</code> or more, <code>container</code> class should have a <code>grid-template-areas</code> property in which the footer and header areas occupy the top and bottom rows respectively and advert and content occupy the left and right columns of the middle row.");'
+  - text: When the viewport is <code>400px</code> or more, <code>container</code> class should have a <code>grid-template-areas</code> property in which the footer and header areas occupy the top and bottom rows respectively and advert and content occupy the left and right columns of the middle row.
+    testString: assert(code.match(/@media\s*?\(\s*?min-width\s*?:\s*?400px\s*?\)[\s\S]*.container\s*?{[\s\S]*grid-template-areas\s*?:\s*?"\s*?header\s*?header\s*?"\s*?"\s*?advert\s*?content\s*?"\s*?"\s*?footer\s*?footer\s*?"\s*?;[\s\S]*}/gi), 'When the viewport is <code>400px</code> or more, <code>container</code> class should have a <code>grid-template-areas</code> property in which the footer and header areas occupy the top and bottom rows respectively and advert and content occupy the left and right columns of the middle row.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/create-a-media-query.english.md b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/create-a-media-query.english.md
index 40dc631af3..57ffb52f32 100644
--- a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/create-a-media-query.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/create-a-media-query.english.md
@@ -27,9 +27,9 @@ Add a media query, so that the <code>p</code> tag has a <code>font-size</code> o
 ```yml
 tests:
   - text: Your <code>p</code> element should have the <code>font-size</code> of 10px when the device <code>height</code> is less than or equal to 800px.
-    testString: 'assert($("p").css("font-size") == "10px", "Your <code>p</code> element should have the <code>font-size</code> of 10px when the device <code>height</code> is less than or equal to 800px.");'
+    testString: assert($('p').css('font-size') == '10px', 'Your <code>p</code> element should have the <code>font-size</code> of 10px when the device <code>height</code> is less than or equal to 800px.');
   - text: Declare a <code>@media</code> query for devices with a <code>height</code> less than or equal to 800px.
-    testString: 'assert(code.match(/@media\s*?\(\s*?max-height\s*?:\s*?800px\s*?\)/g), "Declare a <code>@media</code> query for devices with a <code>height</code> less than or equal to 800px.");'
+    testString: assert(code.match(/@media\s*?\(\s*?max-height\s*?:\s*?800px\s*?\)/g), 'Declare a <code>@media</code> query for devices with a <code>height</code> less than or equal to 800px.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-an-image-responsive.english.md b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-an-image-responsive.english.md
index 49652cfce4..191b6c9f4d 100644
--- a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-an-image-responsive.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-an-image-responsive.english.md
@@ -25,11 +25,11 @@ Add style rules for the <code>img</code> tag to make it responsive to the size o
 ```yml
 tests:
   - text: Your <code>img</code> tag should have a <code>max-width</code> set to 100%.
-    testString: 'assert(code.match(/max-width:\s*?100%;/g), "Your <code>img</code> tag should have a <code>max-width</code> set to 100%.");'
+    testString: assert(code.match(/max-width:\s*?100%;/g), 'Your <code>img</code> tag should have a <code>max-width</code> set to 100%.');
   - text: Your <code>img</code> tag should have a <code>display</code> set to block.
-    testString: 'assert($("img").css("display") == "block", "Your <code>img</code> tag should have a <code>display</code> set to block.");'
+    testString: assert($('img').css('display') == 'block', 'Your <code>img</code> tag should have a <code>display</code> set to block.');
   - text: Your <code>img</code> tag should have a <code>height</code> set to auto.
-    testString: 'assert(code.match(/height:\s*?auto;/g), "Your <code>img</code> tag should have a <code>height</code> set to auto.");'
+    testString: assert(code.match(/height:\s*?auto;/g), 'Your <code>img</code> tag should have a <code>height</code> set to auto.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-typography-responsive.english.md b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-typography-responsive.english.md
index 3568a4e66f..2f43999577 100644
--- a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-typography-responsive.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/make-typography-responsive.english.md
@@ -23,9 +23,9 @@ Set the <code>width</code> of the <code>h2</code> tag to 80% of the viewport's w
 ```yml
 tests:
   - text: Your <code>h2</code> tag should have a <code>width</code> of 80vw.
-    testString: 'assert(code.match(/h2\s*?{\s*?width:\s*?80vw;\s*?}/g), "Your <code>h2</code> tag should have a <code>width</code> of 80vw.");'
+    testString: assert(code.match(/h2\s*?{\s*?width:\s*?80vw;\s*?}/g), 'Your <code>h2</code> tag should have a <code>width</code> of 80vw.');
   - text: Your <code>p</code> tag should have a <code>width</code> of 75vmin.
-    testString: 'assert(code.match(/p\s*?{\s*?width:\s*?75vmin;\s*?}/g), "Your <code>p</code> tag should have a <code>width</code> of 75vmin.");'
+    testString: assert(code.match(/p\s*?{\s*?width:\s*?75vmin;\s*?}/g), 'Your <code>p</code> tag should have a <code>width</code> of 75vmin.');
 
 ```
 
diff --git a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md
index e104819ac2..d3f985e690 100644
--- a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md
@@ -25,9 +25,9 @@ Set the <code>width</code> and <code>height</code> of the <code>img</code> tag t
 ```yml
 tests:
   - text: Your <code>img</code> tag should have a <code>width</code> of 100 pixels.
-    testString: 'assert($("img").css("width") == "100px", "Your <code>img</code> tag should have a <code>width</code> of 100 pixels.");'
+    testString: assert($('img').css('width') == '100px', 'Your <code>img</code> tag should have a <code>width</code> of 100 pixels.');
   - text: Your <code>img</code> tag should have a <code>height</code> of 100 pixels.
-    testString: 'assert($("img").css("height") == "100px", "Your <code>img</code> tag should have a <code>height</code> of 100 pixels.");'
+    testString: assert($('img').css('height') == '100px', 'Your <code>img</code> tag should have a <code>height</code> of 100 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.english.md
index a882c01aca..989b0b02df 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.english.md
@@ -23,25 +23,25 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>booWho(true)</code> should return true.
-    testString: 'assert.strictEqual(booWho(true), true, "<code>booWho(true)</code> should return true.");'
+    testString: assert.strictEqual(booWho(true), true, '<code>booWho(true)</code> should return true.');
   - text: <code>booWho(false)</code> should return true.
-    testString: 'assert.strictEqual(booWho(false), true, "<code>booWho(false)</code> should return true.");'
-  - text: '<code>booWho([1, 2, 3])</code> should return false.'
-    testString: 'assert.strictEqual(booWho([1, 2, 3]), false, "<code>booWho([1, 2, 3])</code> should return false.");'
-  - text: '<code>booWho([].slice)</code> should return false.'
-    testString: 'assert.strictEqual(booWho([].slice), false, "<code>booWho([].slice)</code> should return false.");'
+    testString: assert.strictEqual(booWho(false), true, '<code>booWho(false)</code> should return true.');
+  - text: <code>booWho([1, 2, 3])</code> should return false.
+    testString: assert.strictEqual(booWho([1, 2, 3]), false, '<code>booWho([1, 2, 3])</code> should return false.');
+  - text: <code>booWho([].slice)</code> should return false.
+    testString: assert.strictEqual(booWho([].slice), false, '<code>booWho([].slice)</code> should return false.');
   - text: '<code>booWho({ "a": 1 })</code> should return false.'
-    testString: 'assert.strictEqual(booWho({ "a": 1 }), false, "<code>booWho({ "a": 1 })</code> should return false.");'
+    testString: 'assert.strictEqual(booWho({ "a": 1 }), false, ''<code>booWho({ "a": 1 })</code> should return false.'');'
   - text: <code>booWho(1)</code> should return false.
-    testString: 'assert.strictEqual(booWho(1), false, "<code>booWho(1)</code> should return false.");'
+    testString: assert.strictEqual(booWho(1), false, '<code>booWho(1)</code> should return false.');
   - text: <code>booWho(NaN)</code> should return false.
-    testString: 'assert.strictEqual(booWho(NaN), false, "<code>booWho(NaN)</code> should return false.");'
+    testString: assert.strictEqual(booWho(NaN), false, '<code>booWho(NaN)</code> should return false.');
   - text: <code>booWho("a")</code> should return false.
-    testString: 'assert.strictEqual(booWho("a"), false, "<code>booWho("a")</code> should return false.");'
+    testString: assert.strictEqual(booWho("a"), false, '<code>booWho("a")</code> should return false.');
   - text: <code>booWho("true")</code> should return false.
-    testString: 'assert.strictEqual(booWho("true"), false, "<code>booWho("true")</code> should return false.");'
+    testString: assert.strictEqual(booWho("true"), false, '<code>booWho("true")</code> should return false.');
   - text: <code>booWho("false")</code> should return false.
-    testString: 'assert.strictEqual(booWho("false"), false, "<code>booWho("false")</code> should return false.");'
+    testString: assert.strictEqual(booWho("false"), false, '<code>booWho("false")</code> should return false.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.english.md
index 023fe8227f..dadf004d59 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.english.md
@@ -21,20 +21,20 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>chunkArrayInGroups(["a", "b", "c", "d"], 2)</code> should return <code>[["a", "b"], ["c", "d"]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups(["a", "b", "c", "d"], 2), [["a", "b"], ["c", "d"]], "<code>chunkArrayInGroups(["a", "b", "c", "d"], 2)</code> should return <code>[["a", "b"], ["c", "d"]]</code>.");'
-  - text: '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5], 3), [[0, 1, 2], [3, 4, 5]], "<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5]]</code>.");'
-  - text: '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2), [[0, 1], [2, 3], [4, 5]], "<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5]]</code>.");'
-  - text: '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5], 4), [[0, 1, 2, 3], [4, 5]], "<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5]]</code>.");'
-  - text: '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5], [6]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6], 3), [[0, 1, 2], [3, 4, 5], [6]], "<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5], [6]]</code>.");'
-  - text: '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5, 6, 7], [8]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4), [[0, 1, 2, 3], [4, 5, 6, 7], [8]], "<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5, 6, 7], [8]]</code>.");'
-  - text: '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5], [6, 7], [8]]</code>.'
-    testString: 'assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 2), [[0, 1], [2, 3], [4, 5], [6, 7], [8]], "<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5], [6, 7], [8]]</code>.");'
+  - text: <code>chunkArrayInGroups(["a", "b", "c", "d"], 2)</code> should return <code>[["a", "b"], ["c", "d"]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups(["a", "b", "c", "d"], 2), [["a", "b"], ["c", "d"]], '<code>chunkArrayInGroups(["a", "b", "c", "d"], 2)</code> should return <code>[["a", "b"], ["c", "d"]]</code>.');
+  - text: <code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5], 3), [[0, 1, 2], [3, 4, 5]], '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5]]</code>.');
+  - text: <code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2), [[0, 1], [2, 3], [4, 5]], '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5]]</code>.');
+  - text: <code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5], 4), [[0, 1, 2, 3], [4, 5]], '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5]]</code>.');
+  - text: <code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5], [6]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6], 3), [[0, 1, 2], [3, 4, 5], [6]], '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6], 3)</code> should return <code>[[0, 1, 2], [3, 4, 5], [6]]</code>.');
+  - text: <code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5, 6, 7], [8]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4), [[0, 1, 2, 3], [4, 5, 6, 7], [8]], '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4)</code> should return <code>[[0, 1, 2, 3], [4, 5, 6, 7], [8]]</code>.');
+  - text: <code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5], [6, 7], [8]]</code>.
+    testString: assert.deepEqual(chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 2), [[0, 1], [2, 3], [4, 5], [6, 7], [8]], '<code>chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 2)</code> should return <code>[[0, 1], [2, 3], [4, 5], [6, 7], [8]]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.english.md
index cd16f1d945..1ca7ae2ba5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.english.md
@@ -22,28 +22,28 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>confirmEnding("Bastian", "n")</code> should return true.'
-    testString: 'assert(confirmEnding("Bastian", "n") === true, "<code>confirmEnding("Bastian", "n")</code> should return true.");'
-  - text: '<code>confirmEnding("Congratulation", "on")</code> should return true.'
-    testString: 'assert(confirmEnding("Congratulation", "on") === true, "<code>confirmEnding("Congratulation", "on")</code> should return true.");'
-  - text: '<code>confirmEnding("Connor", "n")</code> should return false.'
-    testString: 'assert(confirmEnding("Connor", "n") === false, "<code>confirmEnding("Connor", "n")</code> should return false.");'
-  - text: '<code>confirmEnding("Walking on water and developing software from a specification are easy if both are frozen"&#44; "specification"&#41;</code> should return false.'
-    testString: 'assert(confirmEnding("Walking on water and developing software from a specification are easy if both are frozen", "specification") === false, "<code>confirmEnding("Walking on water and developing software from a specification are easy if both are frozen"&#44; "specification"&#41;</code> should return false.");'
-  - text: '<code>confirmEnding("He has to give me a new name", "name")</code> should return true.'
-    testString: 'assert(confirmEnding("He has to give me a new name", "name") === true, "<code>confirmEnding("He has to give me a new name", "name")</code> should return true.");'
-  - text: '<code>confirmEnding("Open sesame", "same")</code> should return true.'
-    testString: 'assert(confirmEnding("Open sesame", "same") === true, "<code>confirmEnding("Open sesame", "same")</code> should return true.");'
-  - text: '<code>confirmEnding("Open sesame", "pen")</code> should return false.'
-    testString: 'assert(confirmEnding("Open sesame", "pen") === false, "<code>confirmEnding("Open sesame", "pen")</code> should return false.");'
-  - text: '<code>confirmEnding("Open sesame", "game")</code> should return false.'
-    testString: 'assert(confirmEnding("Open sesame", "game") === false, "<code>confirmEnding("Open sesame", "game")</code> should return false.");'
-  - text: '<code>confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain")</code> should return false.'
-    testString: 'assert(confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain") === false, "<code>confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain")</code> should return false.");'
-  - text: '<code>confirmEnding("Abstraction", "action")</code> should return true.'
-    testString: 'assert(confirmEnding("Abstraction", "action") === true, "<code>confirmEnding("Abstraction", "action")</code> should return true.");'
+  - text: <code>confirmEnding("Bastian", "n")</code> should return true.
+    testString: assert(confirmEnding("Bastian", "n") === true, '<code>confirmEnding("Bastian", "n")</code> should return true.');
+  - text: <code>confirmEnding("Congratulation", "on")</code> should return true.
+    testString: assert(confirmEnding("Congratulation", "on") === true, '<code>confirmEnding("Congratulation", "on")</code> should return true.');
+  - text: <code>confirmEnding("Connor", "n")</code> should return false.
+    testString: assert(confirmEnding("Connor", "n") === false, '<code>confirmEnding("Connor", "n")</code> should return false.');
+  - text: <code>confirmEnding("Walking on water and developing software from a specification are easy if both are frozen"&#44; "specification"&#41;</code> should return false.
+    testString: assert(confirmEnding("Walking on water and developing software from a specification are easy if both are frozen", "specification") === false, '<code>confirmEnding("Walking on water and developing software from a specification are easy if both are frozen"&#44; "specification"&#41;</code> should return false.');
+  - text: <code>confirmEnding("He has to give me a new name", "name")</code> should return true.
+    testString: assert(confirmEnding("He has to give me a new name", "name") === true, '<code>confirmEnding("He has to give me a new name", "name")</code> should return true.');
+  - text: <code>confirmEnding("Open sesame", "same")</code> should return true.
+    testString: assert(confirmEnding("Open sesame", "same") === true, '<code>confirmEnding("Open sesame", "same")</code> should return true.');
+  - text: <code>confirmEnding("Open sesame", "pen")</code> should return false.
+    testString: assert(confirmEnding("Open sesame", "pen") === false, '<code>confirmEnding("Open sesame", "pen")</code> should return false.');
+  - text: <code>confirmEnding("Open sesame", "game")</code> should return false.
+    testString: assert(confirmEnding("Open sesame", "game") === false, '<code>confirmEnding("Open sesame", "game")</code> should return false.');
+  - text: <code>confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain")</code> should return false.
+    testString: assert(confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain") === false, '<code>confirmEnding("If you want to save our world, you must hurry. We dont know how much longer we can withstand the nothing", "mountain")</code> should return false.');
+  - text: <code>confirmEnding("Abstraction", "action")</code> should return true.
+    testString: assert(confirmEnding("Abstraction", "action") === true, '<code>confirmEnding("Abstraction", "action")</code> should return true.');
   - text: Do not use the built-in method <code>.endsWith()</code> to solve the challenge.
-    testString: 'assert(!(/\.endsWith\(.*?\)\s*?;?/.test(code)) && !(/\["endsWith"\]/.test(code)), "Do not use the built-in method <code>.endsWith()</code> to solve the challenge.");'
+    testString: assert(!(/\.endsWith\(.*?\)\s*?;?/.test(code)) && !(/\['endsWith'\]/.test(code)), 'Do not use the built-in method <code>.endsWith()</code> to solve the challenge.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.english.md
index 12199f6a47..810752f734 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.english.md
@@ -23,17 +23,17 @@ Don't worry too much about the function and return statements as they will be co
 ```yml
 tests:
   - text: <code>convertToF(0)</code> should return a number
-    testString: 'assert(typeof convertToF(0) === "number", "<code>convertToF(0)</code> should return a number");'
+    testString: assert(typeof convertToF(0) === 'number', '<code>convertToF(0)</code> should return a number');
   - text: <code>convertToF(-30)</code> should return a value of <code>-22</code>
-    testString: 'assert(convertToF(-30) === -22, "<code>convertToF(-30)</code> should return a value of <code>-22</code>");'
+    testString: assert(convertToF(-30) === -22, '<code>convertToF(-30)</code> should return a value of <code>-22</code>');
   - text: <code>convertToF(-10)</code> should return a value of <code>14</code>
-    testString: 'assert(convertToF(-10) === 14, "<code>convertToF(-10)</code> should return a value of <code>14</code>");'
+    testString: assert(convertToF(-10) === 14, '<code>convertToF(-10)</code> should return a value of <code>14</code>');
   - text: <code>convertToF(0)</code> should return a value of <code>32</code>
-    testString: 'assert(convertToF(0) === 32, "<code>convertToF(0)</code> should return a value of <code>32</code>");'
+    testString: assert(convertToF(0) === 32, '<code>convertToF(0)</code> should return a value of <code>32</code>');
   - text: <code>convertToF(20)</code> should return a value of <code>68</code>
-    testString: 'assert(convertToF(20) === 68, "<code>convertToF(20)</code> should return a value of <code>68</code>");'
+    testString: assert(convertToF(20) === 68, '<code>convertToF(20)</code> should return a value of <code>68</code>');
   - text: <code>convertToF(30)</code> should return a value of <code>86</code>
-    testString: 'assert(convertToF(30) === 86, "<code>convertToF(30)</code> should return a value of <code>86</code>");'
+    testString: assert(convertToF(30) === 86, '<code>convertToF(30)</code> should return a value of <code>86</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.english.md
index 9ad98b1f6a..68fb5bd608 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.english.md
@@ -26,15 +26,15 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>factorialize(5)</code> should return a number.
-    testString: 'assert(typeof factorialize(5) === "number", "<code>factorialize(5)</code> should return a number.");'
+    testString: assert(typeof factorialize(5) === 'number', '<code>factorialize(5)</code> should return a number.');
   - text: <code>factorialize(5)</code> should return 120.
-    testString: 'assert(factorialize(5) === 120, "<code>factorialize(5)</code> should return 120.");'
+    testString: assert(factorialize(5) === 120, '<code>factorialize(5)</code> should return 120.');
   - text: <code>factorialize(10)</code> should return 3628800.
-    testString: 'assert(factorialize(10) === 3628800, "<code>factorialize(10)</code> should return 3628800.");'
+    testString: assert(factorialize(10) === 3628800, '<code>factorialize(10)</code> should return 3628800.');
   - text: <code>factorialize(20)</code> should return 2432902008176640000.
-    testString: 'assert(factorialize(20) === 2432902008176640000, "<code>factorialize(20)</code> should return 2432902008176640000.");'
+    testString: assert(factorialize(20) === 2432902008176640000, '<code>factorialize(20)</code> should return 2432902008176640000.');
   - text: <code>factorialize(0)</code> should return 1.
-    testString: 'assert(factorialize(0) === 1, "<code>factorialize(0)</code> should return 1.");'
+    testString: assert(factorialize(0) === 1, '<code>factorialize(0)</code> should return 1.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.english.md
index edfd638ea1..f9599a375e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.english.md
@@ -23,14 +23,14 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>bouncer([7, "ate", "", false, 9])</code> should return <code>[7, "ate", 9]</code>.'
-    testString: 'assert.deepEqual(bouncer([7, "ate", "", false, 9]), [7, "ate", 9], "<code>bouncer([7, "ate", "", false, 9])</code> should return <code>[7, "ate", 9]</code>.");'
-  - text: '<code>bouncer(["a", "b", "c"])</code> should return <code>["a", "b", "c"]</code>.'
-    testString: 'assert.deepEqual(bouncer(["a", "b", "c"]), ["a", "b", "c"], "<code>bouncer(["a", "b", "c"])</code> should return <code>["a", "b", "c"]</code>.");'
-  - text: '<code>bouncer([false, null, 0, NaN, undefined, ""])</code> should return <code>[]</code>.'
-    testString: 'assert.deepEqual(bouncer([false, null, 0, NaN, undefined, ""]), [], "<code>bouncer([false, null, 0, NaN, undefined, ""])</code> should return <code>[]</code>.");'
-  - text: '<code>bouncer([1, null, NaN, 2, undefined])</code> should return <code>[1, 2]</code>.'
-    testString: 'assert.deepEqual(bouncer([1, null, NaN, 2, undefined]), [1, 2], "<code>bouncer([1, null, NaN, 2, undefined])</code> should return <code>[1, 2]</code>.");'
+  - text: <code>bouncer([7, "ate", "", false, 9])</code> should return <code>[7, "ate", 9]</code>.
+    testString: assert.deepEqual(bouncer([7, "ate", "", false, 9]), [7, "ate", 9], '<code>bouncer([7, "ate", "", false, 9])</code> should return <code>[7, "ate", 9]</code>.');
+  - text: <code>bouncer(["a", "b", "c"])</code> should return <code>["a", "b", "c"]</code>.
+    testString: assert.deepEqual(bouncer(["a", "b", "c"]), ["a", "b", "c"], '<code>bouncer(["a", "b", "c"])</code> should return <code>["a", "b", "c"]</code>.');
+  - text: <code>bouncer([false, null, 0, NaN, undefined, ""])</code> should return <code>[]</code>.
+    testString: assert.deepEqual(bouncer([false, null, 0, NaN, undefined, ""]), [], '<code>bouncer([false, null, 0, NaN, undefined, ""])</code> should return <code>[]</code>.');
+  - text: <code>bouncer([1, null, NaN, 2, undefined])</code> should return <code>[1, 2]</code>.
+    testString: assert.deepEqual(bouncer([1, null, NaN, 2, undefined]), [1, 2], '<code>bouncer([1, null, NaN, 2, undefined])</code> should return <code>[1, 2]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.english.md
index 173fadf647..fda8d10811 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.english.md
@@ -23,17 +23,17 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>findLongestWordLength("The quick brown fox jumped over the lazy dog")</code> should return a number.
-    testString: 'assert(typeof findLongestWordLength("The quick brown fox jumped over the lazy dog") === "number", "<code>findLongestWordLength("The quick brown fox jumped over the lazy dog")</code> should return a number.");'
+    testString: assert(typeof findLongestWordLength("The quick brown fox jumped over the lazy dog") === "number", '<code>findLongestWordLength("The quick brown fox jumped over the lazy dog")</code> should return a number.');
   - text: <code>findLongestWordLength("The quick brown fox jumped over the lazy dog")</code> should return 6.
-    testString: 'assert(findLongestWordLength("The quick brown fox jumped over the lazy dog") === 6, "<code>findLongestWordLength("The quick brown fox jumped over the lazy dog")</code> should return 6.");'
+    testString: assert(findLongestWordLength("The quick brown fox jumped over the lazy dog") === 6, '<code>findLongestWordLength("The quick brown fox jumped over the lazy dog")</code> should return 6.');
   - text: <code>findLongestWordLength("May the force be with you")</code> should return 5.
-    testString: 'assert(findLongestWordLength("May the force be with you") === 5, "<code>findLongestWordLength("May the force be with you")</code> should return 5.");'
+    testString: assert(findLongestWordLength("May the force be with you") === 5, '<code>findLongestWordLength("May the force be with you")</code> should return 5.');
   - text: <code>findLongestWordLength("Google do a barrel roll")</code> should return 6.
-    testString: 'assert(findLongestWordLength("Google do a barrel roll") === 6, "<code>findLongestWordLength("Google do a barrel roll")</code> should return 6.");'
+    testString: assert(findLongestWordLength("Google do a barrel roll") === 6, '<code>findLongestWordLength("Google do a barrel roll")</code> should return 6.');
   - text: <code>findLongestWordLength("What is the average airspeed velocity of an unladen swallow")</code> should return 8.
-    testString: 'assert(findLongestWordLength("What is the average airspeed velocity of an unladen swallow") === 8, "<code>findLongestWordLength("What is the average airspeed velocity of an unladen swallow")</code> should return 8.");'
+    testString: assert(findLongestWordLength("What is the average airspeed velocity of an unladen swallow") === 8, '<code>findLongestWordLength("What is the average airspeed velocity of an unladen swallow")</code> should return 8.');
   - text: <code>findLongestWordLength("What if we try a super-long word such as otorhinolaryngology")</code> should return 19.
-    testString: 'assert(findLongestWordLength("What if we try a super-long word such as otorhinolaryngology") === 19, "<code>findLongestWordLength("What if we try a super-long word such as otorhinolaryngology")</code> should return 19.");'
+    testString: assert(findLongestWordLength("What if we try a super-long word such as otorhinolaryngology") === 19, '<code>findLongestWordLength("What if we try a super-long word such as otorhinolaryngology")</code> should return 19.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.english.md
index d35f3f8c36..51ec8c8713 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.english.md
@@ -21,10 +21,10 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.'
-    testString: 'assert.strictEqual(findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; }), 8, "<code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.");'
-  - text: '<code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.'
-    testString: 'assert.strictEqual(findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; }), undefined, "<code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.");'
+  - text: <code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.
+    testString: assert.strictEqual(findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; }), 8, '<code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.');
+  - text: <code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.
+    testString: assert.strictEqual(findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; }), undefined, '<code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.english.md
index 9a8d1e5559..24aa3cd081 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.english.md
@@ -24,24 +24,24 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>mutation(["hello", "hey"])</code> should return false.'
-    testString: 'assert(mutation(["hello", "hey"]) === false, "<code>mutation(["hello", "hey"])</code> should return false.");'
-  - text: '<code>mutation(["hello", "Hello"])</code> should return true.'
-    testString: 'assert(mutation(["hello", "Hello"]) === true, "<code>mutation(["hello", "Hello"])</code> should return true.");'
-  - text: '<code>mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])</code> should return true.'
-    testString: 'assert(mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"]) === true, "<code>mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])</code> should return true.");'
-  - text: '<code>mutation(["Mary", "Army"])</code> should return true.'
-    testString: 'assert(mutation(["Mary", "Army"]) === true, "<code>mutation(["Mary", "Army"])</code> should return true.");'
-  - text: '<code>mutation(["Mary", "Aarmy"])</code> should return true.'
-    testString: 'assert(mutation(["Mary", "Aarmy"]) === true, "<code>mutation(["Mary", "Aarmy"])</code> should return true.");'
-  - text: '<code>mutation(["Alien", "line"])</code> should return true.'
-    testString: 'assert(mutation(["Alien", "line"]) === true, "<code>mutation(["Alien", "line"])</code> should return true.");'
-  - text: '<code>mutation(["floor", "for"])</code> should return true.'
-    testString: 'assert(mutation(["floor", "for"]) === true, "<code>mutation(["floor", "for"])</code> should return true.");'
-  - text: '<code>mutation(["hello", "neo"])</code> should return false.'
-    testString: 'assert(mutation(["hello", "neo"]) === false, "<code>mutation(["hello", "neo"])</code> should return false.");'
-  - text: '<code>mutation(["voodoo", "no"])</code> should return false.'
-    testString: 'assert(mutation(["voodoo", "no"]) === false, "<code>mutation(["voodoo", "no"])</code> should return false.");'
+  - text: <code>mutation(["hello", "hey"])</code> should return false.
+    testString: assert(mutation(["hello", "hey"]) === false, '<code>mutation(["hello", "hey"])</code> should return false.');
+  - text: <code>mutation(["hello", "Hello"])</code> should return true.
+    testString: assert(mutation(["hello", "Hello"]) === true, '<code>mutation(["hello", "Hello"])</code> should return true.');
+  - text: <code>mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])</code> should return true.
+    testString: assert(mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"]) === true, '<code>mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])</code> should return true.');
+  - text: <code>mutation(["Mary", "Army"])</code> should return true.
+    testString: assert(mutation(["Mary", "Army"]) === true, '<code>mutation(["Mary", "Army"])</code> should return true.');
+  - text: <code>mutation(["Mary", "Aarmy"])</code> should return true.
+    testString: assert(mutation(["Mary", "Aarmy"]) === true, '<code>mutation(["Mary", "Aarmy"])</code> should return true.');
+  - text: <code>mutation(["Alien", "line"])</code> should return true.
+    testString: assert(mutation(["Alien", "line"]) === true, '<code>mutation(["Alien", "line"])</code> should return true.');
+  - text: <code>mutation(["floor", "for"])</code> should return true.
+    testString: assert(mutation(["floor", "for"]) === true, '<code>mutation(["floor", "for"])</code> should return true.');
+  - text: <code>mutation(["hello", "neo"])</code> should return false.
+    testString: assert(mutation(["hello", "neo"]) === false, '<code>mutation(["hello", "neo"])</code> should return false.');
+  - text: <code>mutation(["voodoo", "no"])</code> should return false.
+    testString: assert(mutation(["voodoo", "no"]) === false, '<code>mutation(["voodoo", "no"])</code> should return false.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.english.md
index a37b3da872..47a2dece88 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.english.md
@@ -21,20 +21,20 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.'
-    testString: 'assert(repeatStringNumTimes("*", 3) === "***", "<code>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.");'
-  - text: '<code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.'
-    testString: 'assert(repeatStringNumTimes("abc", 3) === "abcabcabc", "<code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.");'
-  - text: '<code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.'
-    testString: 'assert(repeatStringNumTimes("abc", 4) === "abcabcabcabc", "<code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.");'
-  - text: '<code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.'
-    testString: 'assert(repeatStringNumTimes("abc", 1) === "abc", "<code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.");'
-  - text: '<code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.'
-    testString: 'assert(repeatStringNumTimes("*", 8) === "********", "<code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.");'
-  - text: '<code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.'
-    testString: 'assert(repeatStringNumTimes("abc", -2) === "", "<code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.");'
+  - text: <code>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.
+    testString: assert(repeatStringNumTimes("*", 3) === "***", '<code>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.');
+  - text: <code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.
+    testString: assert(repeatStringNumTimes("abc", 3) === "abcabcabc", '<code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.');
+  - text: <code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.
+    testString: assert(repeatStringNumTimes("abc", 4) === "abcabcabcabc", '<code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.');
+  - text: <code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.
+    testString: assert(repeatStringNumTimes("abc", 1) === "abc", '<code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.');
+  - text: <code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.
+    testString: assert(repeatStringNumTimes("*", 8) === "********", '<code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.');
+  - text: <code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.
+    testString: assert(repeatStringNumTimes("abc", -2) === "", '<code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.');
   - text: The built-in <code>repeat()</code>-method should not be used
-    testString: 'assert(!/\.repeat/g.test(code), "The built-in <code>repeat()</code>-method should not be used");'
+    testString: assert(!/\.repeat/g.test(code), 'The built-in <code>repeat()</code>-method should not be used');
 
 ```
 
@@ -66,7 +66,7 @@ repeatStringNumTimes("abc", 3);
 
 ```js
 function repeatStringNumTimes(str, num) {
-  if (num < 0) return ";
+  if (num < 0) return '';
   return num === 1 ? str : str + repeatStringNumTimes(str, num-1);
 }
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.english.md
index 2d907ee548..041701ab8b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.english.md
@@ -22,14 +22,14 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return an array.'
-    testString: 'assert(largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]).constructor === Array, "<code>largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return an array.");'
-  - text: '<code>largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return <code>[27, 5, 39, 1001]</code>.'
-    testString: 'assert.deepEqual(largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]]), [27, 5, 39, 1001], "<code>largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return <code>[27, 5, 39, 1001]</code>.");'
-  - text: '<code>largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]])</code> should return <code>[9, 35, 97, 1000000]</code>.'
-    testString: 'assert.deepEqual(largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]]), [9, 35, 97, 1000000], "<code>largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]])</code> should return <code>[9, 35, 97, 1000000]</code>.");'
-  - text: '<code>largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]])</code> should return <code>[25, 48, 21, -3]</code>.'
-    testString: 'assert.deepEqual(largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]]), [25, 48, 21, -3], "<code>largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]])</code> should return <code>[25, 48, 21, -3]</code>.");'
+  - text: <code>largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return an array.
+    testString: assert(largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]).constructor === Array, '<code>largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return an array.');
+  - text: <code>largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return <code>[27, 5, 39, 1001]</code>.
+    testString: assert.deepEqual(largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]]), [27, 5, 39, 1001], '<code>largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])</code> should return <code>[27, 5, 39, 1001]</code>.');
+  - text: <code>largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]])</code> should return <code>[9, 35, 97, 1000000]</code>.
+    testString: assert.deepEqual(largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]]), [9, 35, 97, 1000000], '<code>largestOfFour([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]])</code> should return <code>[9, 35, 97, 1000000]</code>.');
+  - text: <code>largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]])</code> should return <code>[25, 48, 21, -3]</code>.
+    testString: assert.deepEqual(largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]]), [25, 48, 21, -3], '<code>largestOfFour([[17, 23, 25, 12], [25, 7, 34, 48], [4, -10, 18, 21], [-72, -3, -17, -10]])</code> should return <code>[25, 48, 21, -3]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.english.md
index 4415f199a9..5b3779c28a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.english.md
@@ -24,13 +24,13 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>reverseString("hello")</code> should return a string.
-    testString: 'assert(typeof reverseString("hello") === "string", "<code>reverseString("hello")</code> should return a string.");'
+    testString: assert(typeof reverseString("hello") === "string", '<code>reverseString("hello")</code> should return a string.');
   - text: <code>reverseString("hello")</code> should become <code>"olleh"</code>.
-    testString: 'assert(reverseString("hello") === "olleh", "<code>reverseString("hello")</code> should become <code>"olleh"</code>.");'
+    testString: assert(reverseString("hello") === "olleh", '<code>reverseString("hello")</code> should become <code>"olleh"</code>.');
   - text: <code>reverseString("Howdy")</code> should become <code>"ydwoH"</code>.
-    testString: 'assert(reverseString("Howdy") === "ydwoH", "<code>reverseString("Howdy")</code> should become <code>"ydwoH"</code>.");'
+    testString: assert(reverseString("Howdy") === "ydwoH", '<code>reverseString("Howdy")</code> should become <code>"ydwoH"</code>.');
   - text: <code>reverseString("Greetings from Earth")</code> should return <code>"htraE morf sgniteerG"</code>.
-    testString: 'assert(reverseString("Greetings from Earth") === "htraE morf sgniteerG", "<code>reverseString("Greetings from Earth")</code> should return <code>"htraE morf sgniteerG"</code>.");'
+    testString: assert(reverseString("Greetings from Earth") === "htraE morf sgniteerG", '<code>reverseString("Greetings from Earth")</code> should return <code>"htraE morf sgniteerG"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.english.md
index 024644da30..44890ae83d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.english.md
@@ -25,18 +25,18 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>frankenSplice([1, 2, 3], [4, 5], 1)</code> should return <code>[4, 1, 2, 3, 5]</code>.'
-    testString: 'assert.deepEqual(frankenSplice([1, 2, 3], [4, 5], 1), [4, 1, 2, 3, 5], "<code>frankenSplice([1, 2, 3], [4, 5], 1)</code> should return <code>[4, 1, 2, 3, 5]</code>.");'
-  - text: '<code>frankenSplice([1, 2], ["a", "b"], 1)</code> should return <code>["a", 1, 2, "b"]</code>.'
-    testString: 'assert.deepEqual(frankenSplice(testArr1, testArr2, 1), ["a", 1, 2, "b"], "<code>frankenSplice([1, 2], ["a", "b"], 1)</code> should return <code>["a", 1, 2, "b"]</code>.");'
-  - text: '<code>frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)</code> should return <code>["head", "shoulders", "claw", "tentacle", "knees", "toes"]</code>.'
-    testString: 'assert.deepEqual(frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2), ["head", "shoulders", "claw", "tentacle", "knees", "toes"], "<code>frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)</code> should return <code>["head", "shoulders", "claw", "tentacle", "knees", "toes"]</code>.");'
+  - text: <code>frankenSplice([1, 2, 3], [4, 5], 1)</code> should return <code>[4, 1, 2, 3, 5]</code>.
+    testString: assert.deepEqual(frankenSplice([1, 2, 3], [4, 5], 1), [4, 1, 2, 3, 5], '<code>frankenSplice([1, 2, 3], [4, 5], 1)</code> should return <code>[4, 1, 2, 3, 5]</code>.');
+  - text: <code>frankenSplice([1, 2], ["a", "b"], 1)</code> should return <code>["a", 1, 2, "b"]</code>.
+    testString: assert.deepEqual(frankenSplice(testArr1, testArr2, 1), ["a", 1, 2, "b"], '<code>frankenSplice([1, 2], ["a", "b"], 1)</code> should return <code>["a", 1, 2, "b"]</code>.');
+  - text: <code>frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)</code> should return <code>["head", "shoulders", "claw", "tentacle", "knees", "toes"]</code>.
+    testString: assert.deepEqual(frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2), ["head", "shoulders", "claw", "tentacle", "knees", "toes"], '<code>frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)</code> should return <code>["head", "shoulders", "claw", "tentacle", "knees", "toes"]</code>.');
   - text: All elements from the first array should be added to the second array in their original order.
-    testString: 'assert.deepEqual(frankenSplice([1, 2, 3, 4], [], 0), [1, 2, 3, 4], "All elements from the first array should be added to the second array in their original order.");'
+    testString: assert.deepEqual(frankenSplice([1, 2, 3, 4], [], 0), [1, 2, 3, 4], 'All elements from the first array should be added to the second array in their original order.');
   - text: The first array should remain the same after the function runs.
-    testString: 'assert(testArr1[0] === 1 && testArr1[1] === 2, "The first array should remain the same after the function runs.");'
+    testString: assert(testArr1[0] === 1 && testArr1[1] === 2, 'The first array should remain the same after the function runs.');
   - text: The second array should remain the same after the function runs.
-    testString: 'assert(testArr2[0] === "a" && testArr2[1] === "b", "The second array should remain the same after the function runs.");'
+    testString: assert(testArr2[0] === "a" && testArr2[1] === "b", 'The second array should remain the same after the function runs.');
 
 ```
 
@@ -63,7 +63,8 @@ frankenSplice([1, 2, 3], [4, 5, 6], 1);
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+let testArr1 = [1, 2];
+let testArr2 = ["a", "b"];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.english.md
index 79e59789e1..2a99ebfe11 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.english.md
@@ -22,14 +22,14 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>titleCase("I&#39;m a little tea pot")</code> should return a string.'
-    testString: 'assert(typeof titleCase("I"m a little tea pot") === "string", "<code>titleCase("I&#39;m a little tea pot")</code> should return a string.");'
-  - text: '<code>titleCase("I&#39;m a little tea pot")</code> should return <code>I&#39;m A Little Tea Pot</code>.'
-    testString: 'assert(titleCase("I"m a little tea pot") === "I"m A Little Tea Pot", "<code>titleCase("I&#39;m a little tea pot")</code> should return <code>I&#39;m A Little Tea Pot</code>.");'
+  - text: <code>titleCase("I&#39;m a little tea pot")</code> should return a string.
+    testString: assert(typeof titleCase("I'm a little tea pot") === "string", '<code>titleCase("I&#39;m a little tea pot")</code> should return a string.');
+  - text: <code>titleCase("I&#39;m a little tea pot")</code> should return <code>I&#39;m A Little Tea Pot</code>.
+    testString: assert(titleCase("I'm a little tea pot") === "I'm A Little Tea Pot", '<code>titleCase("I&#39;m a little tea pot")</code> should return <code>I&#39;m A Little Tea Pot</code>.');
   - text: <code>titleCase("sHoRt AnD sToUt")</code> should return <code>Short And Stout</code>.
-    testString: 'assert(titleCase("sHoRt AnD sToUt") === "Short And Stout", "<code>titleCase("sHoRt AnD sToUt")</code> should return <code>Short And Stout</code>.");'
+    testString: assert(titleCase("sHoRt AnD sToUt") === "Short And Stout", '<code>titleCase("sHoRt AnD sToUt")</code> should return <code>Short And Stout</code>.');
   - text: <code>titleCase("HERE IS MY HANDLE HERE IS MY SPOUT")</code> should return <code>Here Is My Handle Here Is My Spout</code>.
-    testString: 'assert(titleCase("HERE IS MY HANDLE HERE IS MY SPOUT") === "Here Is My Handle Here Is My Spout", "<code>titleCase("HERE IS MY HANDLE HERE IS MY SPOUT")</code> should return <code>Here Is My Handle Here Is My Spout</code>.");'
+    testString: assert(titleCase("HERE IS MY HANDLE HERE IS MY SPOUT") === "Here Is My Handle Here Is My Spout", '<code>titleCase("HERE IS MY HANDLE HERE IS MY SPOUT")</code> should return <code>Here Is My Handle Here Is My Spout</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.english.md
index a886928f22..398ee93db3 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.english.md
@@ -21,18 +21,18 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>truncateString("A-tisket a-tasket A green and yellow basket", 8)</code> should return "A-tisket...".'
-    testString: 'assert(truncateString("A-tisket a-tasket A green and yellow basket", 8) === "A-tisket...", "<code>truncateString("A-tisket a-tasket A green and yellow basket", 8)</code> should return "A-tisket...".");'
-  - text: '<code>truncateString("Peter Piper picked a peck of pickled peppers", 11)</code> should return "Peter Piper...".'
-    testString: 'assert(truncateString("Peter Piper picked a peck of pickled peppers", 11) === "Peter Piper...", "<code>truncateString("Peter Piper picked a peck of pickled peppers", 11)</code> should return "Peter Piper...".");'
-  - text: '<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)</code> should return "A-tisket a-tasket A green and yellow basket".'
-    testString: 'assert(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length) === "A-tisket a-tasket A green and yellow basket", "<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)</code> should return "A-tisket a-tasket A green and yellow basket".");'
-  - text: '<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)</code> should return "A-tisket a-tasket A green and yellow basket".'
-    testString: 'assert(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2) === "A-tisket a-tasket A green and yellow basket", "<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)</code> should return "A-tisket a-tasket A green and yellow basket".");'
-  - text: '<code>truncateString("A-", 1)</code> should return "A...".'
-    testString: 'assert(truncateString("A-", 1) === "A...", "<code>truncateString("A-", 1)</code> should return "A...".");'
-  - text: '<code>truncateString("Absolutely Longer", 2)</code> should return "Ab...".'
-    testString: 'assert(truncateString("Absolutely Longer", 2) === "Ab...", "<code>truncateString("Absolutely Longer", 2)</code> should return "Ab...".");'
+  - text: <code>truncateString("A-tisket a-tasket A green and yellow basket", 8)</code> should return "A-tisket...".
+    testString: assert(truncateString("A-tisket a-tasket A green and yellow basket", 8) === "A-tisket...", '<code>truncateString("A-tisket a-tasket A green and yellow basket", 8)</code> should return "A-tisket...".');
+  - text: <code>truncateString("Peter Piper picked a peck of pickled peppers", 11)</code> should return "Peter Piper...".
+    testString: assert(truncateString("Peter Piper picked a peck of pickled peppers", 11) === "Peter Piper...", '<code>truncateString("Peter Piper picked a peck of pickled peppers", 11)</code> should return "Peter Piper...".');
+  - text: <code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)</code> should return "A-tisket a-tasket A green and yellow basket".
+    testString: assert(truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length) === "A-tisket a-tasket A green and yellow basket", '<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length)</code> should return "A-tisket a-tasket A green and yellow basket".');
+  - text: <code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)</code> should return "A-tisket a-tasket A green and yellow basket".
+    testString: assert(truncateString('A-tisket a-tasket A green and yellow basket', 'A-tisket a-tasket A green and yellow basket'.length + 2) === 'A-tisket a-tasket A green and yellow basket', '<code>truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2)</code> should return "A-tisket a-tasket A green and yellow basket".');
+  - text: <code>truncateString("A-", 1)</code> should return "A...".
+    testString: assert(truncateString("A-", 1) === "A...", '<code>truncateString("A-", 1)</code> should return "A...".');
+  - text: <code>truncateString("Absolutely Longer", 2)</code> should return "Ab...".
+    testString: assert(truncateString("Absolutely Longer", 2) === "Ab...", '<code>truncateString("Absolutely Longer", 2)</code> should return "Ab...".');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.english.md
index b706369d62..7e4eb3edbe 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.english.md
@@ -23,38 +23,38 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return <code>3</code>.'
-    testString: 'assert(getIndexToIns([10, 20, 30, 40, 50], 35) === 3, "<code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return <code>3</code>.");'
-  - text: '<code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([10, 20, 30, 40, 50], 35)) === "number", "<code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return a number.");'
-  - text: '<code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return <code>2</code>.'
-    testString: 'assert(getIndexToIns([10, 20, 30, 40, 50], 30) === 2, "<code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return <code>2</code>.");'
-  - text: '<code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([10, 20, 30, 40, 50], 30)) === "number", "<code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return a number.");'
-  - text: '<code>getIndexToIns([40, 60], 50)</code> should return <code>1</code>.'
-    testString: 'assert(getIndexToIns([40, 60], 50) === 1, "<code>getIndexToIns([40, 60], 50)</code> should return <code>1</code>.");'
-  - text: '<code>getIndexToIns([40, 60], 50)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([40, 60], 50)) === "number", "<code>getIndexToIns([40, 60], 50)</code> should return a number.");'
-  - text: '<code>getIndexToIns([3, 10, 5], 3)</code> should return <code>0</code>.'
-    testString: 'assert(getIndexToIns([3, 10, 5], 3) === 0, "<code>getIndexToIns([3, 10, 5], 3)</code> should return <code>0</code>.");'
-  - text: '<code>getIndexToIns([3, 10, 5], 3)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([3, 10, 5], 3)) === "number", "<code>getIndexToIns([3, 10, 5], 3)</code> should return a number.");'
-  - text: '<code>getIndexToIns([5, 3, 20, 3], 5)</code> should return <code>2</code>.'
-    testString: 'assert(getIndexToIns([5, 3, 20, 3], 5) === 2, "<code>getIndexToIns([5, 3, 20, 3], 5)</code> should return <code>2</code>.");'
-  - text: '<code>getIndexToIns([5, 3, 20, 3], 5)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([5, 3, 20, 3], 5)) === "number", "<code>getIndexToIns([5, 3, 20, 3], 5)</code> should return a number.");'
-  - text: '<code>getIndexToIns([2, 20, 10], 19)</code> should return <code>2</code>.'
-    testString: 'assert(getIndexToIns([2, 20, 10], 19) === 2, "<code>getIndexToIns([2, 20, 10], 19)</code> should return <code>2</code>.");'
-  - text: '<code>getIndexToIns([2, 20, 10], 19)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([2, 20, 10], 19)) === "number", "<code>getIndexToIns([2, 20, 10], 19)</code> should return a number.");'
-  - text: '<code>getIndexToIns([2, 5, 10], 15)</code> should return <code>3</code>.'
-    testString: 'assert(getIndexToIns([2, 5, 10], 15) === 3, "<code>getIndexToIns([2, 5, 10], 15)</code> should return <code>3</code>.");'
-  - text: '<code>getIndexToIns([2, 5, 10], 15)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([2, 5, 10], 15)) === "number", "<code>getIndexToIns([2, 5, 10], 15)</code> should return a number.");'
-  - text: '<code>getIndexToIns([], 1)</code> should return <code>0</code>.'
-    testString: 'assert(getIndexToIns([], 1) === 0, "<code>getIndexToIns([], 1)</code> should return <code>0</code>.");'
-  - text: '<code>getIndexToIns([], 1)</code> should return a number.'
-    testString: 'assert(typeof(getIndexToIns([], 1)) === "number", "<code>getIndexToIns([], 1)</code> should return a number.");'
+  - text: <code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return <code>3</code>.
+    testString: assert(getIndexToIns([10, 20, 30, 40, 50], 35) === 3, '<code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return <code>3</code>.');
+  - text: <code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([10, 20, 30, 40, 50], 35)) === "number", '<code>getIndexToIns([10, 20, 30, 40, 50], 35)</code> should return a number.');
+  - text: <code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return <code>2</code>.
+    testString: assert(getIndexToIns([10, 20, 30, 40, 50], 30) === 2, '<code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return <code>2</code>.');
+  - text: <code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([10, 20, 30, 40, 50], 30)) === "number", '<code>getIndexToIns([10, 20, 30, 40, 50], 30)</code> should return a number.');
+  - text: <code>getIndexToIns([40, 60], 50)</code> should return <code>1</code>.
+    testString: assert(getIndexToIns([40, 60], 50) === 1, '<code>getIndexToIns([40, 60], 50)</code> should return <code>1</code>.');
+  - text: <code>getIndexToIns([40, 60], 50)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([40, 60], 50)) === "number", '<code>getIndexToIns([40, 60], 50)</code> should return a number.');
+  - text: <code>getIndexToIns([3, 10, 5], 3)</code> should return <code>0</code>.
+    testString: assert(getIndexToIns([3, 10, 5], 3) === 0, '<code>getIndexToIns([3, 10, 5], 3)</code> should return <code>0</code>.');
+  - text: <code>getIndexToIns([3, 10, 5], 3)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([3, 10, 5], 3)) === "number", '<code>getIndexToIns([3, 10, 5], 3)</code> should return a number.');
+  - text: <code>getIndexToIns([5, 3, 20, 3], 5)</code> should return <code>2</code>.
+    testString: assert(getIndexToIns([5, 3, 20, 3], 5) === 2, '<code>getIndexToIns([5, 3, 20, 3], 5)</code> should return <code>2</code>.');
+  - text: <code>getIndexToIns([5, 3, 20, 3], 5)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([5, 3, 20, 3], 5)) === "number", '<code>getIndexToIns([5, 3, 20, 3], 5)</code> should return a number.');
+  - text: <code>getIndexToIns([2, 20, 10], 19)</code> should return <code>2</code>.
+    testString: assert(getIndexToIns([2, 20, 10], 19) === 2, '<code>getIndexToIns([2, 20, 10], 19)</code> should return <code>2</code>.');
+  - text: <code>getIndexToIns([2, 20, 10], 19)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([2, 20, 10], 19)) === "number", '<code>getIndexToIns([2, 20, 10], 19)</code> should return a number.');
+  - text: <code>getIndexToIns([2, 5, 10], 15)</code> should return <code>3</code>.
+    testString: assert(getIndexToIns([2, 5, 10], 15) === 3, '<code>getIndexToIns([2, 5, 10], 15)</code> should return <code>3</code>.');
+  - text: <code>getIndexToIns([2, 5, 10], 15)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([2, 5, 10], 15)) === "number", '<code>getIndexToIns([2, 5, 10], 15)</code> should return a number.');
+  - text: <code>getIndexToIns([], 1)</code> should return <code>0</code>.
+    testString: assert(getIndexToIns([], 1) === 0, '<code>getIndexToIns([], 1)</code> should return <code>0</code>.');
+  - text: <code>getIndexToIns([], 1)</code> should return a number.
+    testString: assert(typeof(getIndexToIns([], 1)) === "number", '<code>getIndexToIns([], 1)</code> should return a number.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement.english.md
index ce8bfdb5bd..c02fef75d9 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/-iterate-through-the-keys-of-an-object-with-a-for...in-statement.english.md
@@ -23,9 +23,9 @@ We've defined a function, <code>countOnline</code>; use a <dfn>for...in</dfn> st
 ```yml
 tests:
   - text: The <code>users</code> object contains users <code>Jeff</code> and <code>Ryan</code> with <code>online</code> set to <code>true</code> and users <code>Alan</code> and <code>Sarah</code> with <code>online</code> set to <code>false</code>
-    testString: 'assert(users.Alan.online === false && users.Jeff.online === true &&  users.Sarah.online === false &&  users.Ryan.online === true, "The <code>users</code> object contains users <code>Jeff</code> and <code>Ryan</code> with <code>online</code> set to <code>true</code> and users <code>Alan</code> and <code>Sarah</code> with <code>online</code> set to <code>false</code>");'
+    testString: assert(users.Alan.online === false && users.Jeff.online === true &&  users.Sarah.online === false &&  users.Ryan.online === true, 'The <code>users</code> object contains users <code>Jeff</code> and <code>Ryan</code> with <code>online</code> set to <code>true</code> and users <code>Alan</code> and <code>Sarah</code> with <code>online</code> set to <code>false</code>');
   - text: The function <code>countOnline</code> returns the number of users with the <code>online</code> property set to <code>true</code>
-    testString: 'assert((function() { users.Harry = {online: true}; users.Sam = {online: true}; users.Carl = {online: true}; return countOnline(users) })() === 5, "The function <code>countOnline</code> returns the number of users with the <code>online</code> property set to <code>true</code>");'
+    testString: 'assert((function() { users.Harry = {online: true}; users.Sam = {online: true}; users.Carl = {online: true}; return countOnline(users) })() === 5, ''The function <code>countOnline</code> returns the number of users with the <code>online</code> property set to <code>true</code>'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-an-arrays-contents-using-bracket-notation.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-an-arrays-contents-using-bracket-notation.english.md
index fdc5b22851..6afb763792 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-an-arrays-contents-using-bracket-notation.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-an-arrays-contents-using-bracket-notation.english.md
@@ -28,14 +28,14 @@ In order to complete this challenge, set the 2nd position (index <code>1</code>)
 
 ```yml
 tests:
-  - text: '<code>myArray[0]</code> is equal to <code>"a"</code>'
-    testString: 'assert.strictEqual(myArray[0], "a", "<code>myArray[0]</code> is equal to <code>"a"</code>");'
-  - text: '<code>myArray[1]</code> is no longer set to <code>"b"</code>'
-    testString: 'assert.notStrictEqual(myArray[1], "b", "<code>myArray[1]</code> is no longer set to <code>"b"</code>");'
-  - text: '<code>myArray[2]</code> is equal to <code>"c"</code>'
-    testString: 'assert.strictEqual(myArray[2], "c", "<code>myArray[2]</code> is equal to <code>"c"</code>");'
-  - text: '<code>myArray[3]</code> is equal to <code>"d"</code>'
-    testString: 'assert.strictEqual(myArray[3], "d", "<code>myArray[3]</code> is equal to <code>"d"</code>");'
+  - text: <code>myArray[0]</code> is equal to <code>"a"</code>
+    testString: assert.strictEqual(myArray[0], "a", '<code>myArray[0]</code> is equal to <code>"a"</code>');
+  - text: <code>myArray[1]</code> is no longer set to <code>"b"</code>
+    testString: assert.notStrictEqual(myArray[1], "b", '<code>myArray[1]</code> is no longer set to <code>"b"</code>');
+  - text: <code>myArray[2]</code> is equal to <code>"c"</code>
+    testString: assert.strictEqual(myArray[2], "c", '<code>myArray[2]</code> is equal to <code>"c"</code>');
+  - text: <code>myArray[3]</code> is equal to <code>"d"</code>
+    testString: assert.strictEqual(myArray[3], "d", '<code>myArray[3]</code> is equal to <code>"d"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-property-names-with-bracket-notation.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-property-names-with-bracket-notation.english.md
index ed25859e0b..62a075beee 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-property-names-with-bracket-notation.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/access-property-names-with-bracket-notation.english.md
@@ -22,15 +22,15 @@ We've defined a function, <code>checkInventory</code>, which receives a scanned
 ```yml
 tests:
   - text: <code>checkInventory</code> is a function
-    testString: 'assert.strictEqual(typeof checkInventory, "function", "<code>checkInventory</code> is a function");'
+    testString: assert.strictEqual(typeof checkInventory, 'function', '<code>checkInventory</code> is a function');
   - text: 'The <code>foods</code> object should have only the following key-value pairs: <code>apples: 25</code>, <code>oranges: 32</code>, <code>plums: 28</code>, <code>bananas: 13</code>, <code>grapes: 35</code>, <code>strawberries: 27</code>'
-    testString: 'assert.deepEqual(foods, {apples: 25, oranges: 32, plums: 28, bananas: 13, grapes: 35, strawberries: 27}, "The <code>foods</code> object should have only the following key-value pairs: <code>apples: 25</code>, <code>oranges: 32</code>, <code>plums: 28</code>, <code>bananas: 13</code>, <code>grapes: 35</code>, <code>strawberries: 27</code>");'
+    testString: 'assert.deepEqual(foods, {apples: 25, oranges: 32, plums: 28, bananas: 13, grapes: 35, strawberries: 27}, ''The <code>foods</code> object should have only the following key-value pairs: <code>apples: 25</code>, <code>oranges: 32</code>, <code>plums: 28</code>, <code>bananas: 13</code>, <code>grapes: 35</code>, <code>strawberries: 27</code>'');'
   - text: <code>checkInventory("apples")</code> should return <code>25</code>
-    testString: 'assert.strictEqual(checkInventory("apples"), 25, "<code>checkInventory("apples")</code> should return <code>25</code>");'
+    testString: assert.strictEqual(checkInventory('apples'), 25, '<code>checkInventory("apples")</code> should return <code>25</code>');
   - text: <code>checkInventory("bananas")</code> should return <code>13</code>
-    testString: 'assert.strictEqual(checkInventory("bananas"), 13, "<code>checkInventory("bananas")</code> should return <code>13</code>");'
+    testString: assert.strictEqual(checkInventory('bananas'), 13, '<code>checkInventory("bananas")</code> should return <code>13</code>');
   - text: <code>checkInventory("strawberries")</code> should return <code>27</code>
-    testString: 'assert.strictEqual(checkInventory("strawberries"), 27, "<code>checkInventory("strawberries")</code> should return <code>27</code>");'
+    testString: assert.strictEqual(checkInventory('strawberries'), 27, '<code>checkInventory("strawberries")</code> should return <code>27</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-to-an-array-with-push-and-unshift.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-to-an-array-with-push-and-unshift.english.md
index 1860c025b5..e0fcd4a76e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-to-an-array-with-push-and-unshift.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-to-an-array-with-push-and-unshift.english.md
@@ -22,12 +22,12 @@ We have defined a function, <code>mixedNumbers</code>, which we are passing an a
 
 ```yml
 tests:
-  - text: '<code>mixedNumbers(["IV", 5, "six"])</code> should now return <code>["I", 2, "three", "IV", 5, "six", 7, "VIII", 9]</code>'
-    testString: 'assert.deepEqual(mixedNumbers(["IV", 5, "six"]), ["I", 2, "three", "IV", 5, "six", 7, "VIII", 9], "<code>mixedNumbers(["IV", 5, "six"])</code> should now return <code>["I", 2, "three", "IV", 5, "six", 7, "VIII", 9]</code>");'
+  - text: <code>mixedNumbers(["IV", 5, "six"])</code> should now return <code>["I", 2, "three", "IV", 5, "six", 7, "VIII", 9]</code>
+    testString: assert.deepEqual(mixedNumbers(['IV', 5, 'six']), ['I', 2, 'three', 'IV', 5, 'six', 7, 'VIII', 9], '<code>mixedNumbers(["IV", 5, "six"])</code> should now return <code>["I", 2, "three", "IV", 5, "six", 7, "VIII", 9]</code>');
   - text: The <code>mixedNumbers</code> function should utilize the <code>push()</code> method
-    testString: 'assert.notStrictEqual(mixedNumbers.toString().search(/\.push\(/), -1, "The <code>mixedNumbers</code> function should utilize the <code>push()</code> method");'
+    testString: assert.notStrictEqual(mixedNumbers.toString().search(/\.push\(/), -1, 'The <code>mixedNumbers</code> function should utilize the <code>push()</code> method');
   - text: The <code>mixedNumbers</code> function should utilize the <code>unshift()</code> method
-    testString: 'assert.notStrictEqual(mixedNumbers.toString().search(/\.unshift\(/), -1, "The <code>mixedNumbers</code> function should utilize the <code>unshift()</code> method");'
+    testString: assert.notStrictEqual(mixedNumbers.toString().search(/\.unshift\(/), -1, 'The <code>mixedNumbers</code> function should utilize the <code>unshift()</code> method');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-using-splice.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-using-splice.english.md
index 06ec691331..95f910ea1b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-using-splice.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-items-using-splice.english.md
@@ -21,14 +21,14 @@ We have defined a function, <code>htmlColorNames</code>, which takes an array of
 
 ```yml
 tests:
-  - text: '<code>htmlColorNames</code> should return <code>["DarkSalmon", "BlanchedAlmond", "LavenderBlush", "PaleTurqoise", "FireBrick"]</code>'
-    testString: 'assert.deepEqual(htmlColorNames(["DarkGoldenRod", "WhiteSmoke", "LavenderBlush", "PaleTurqoise", "FireBrick"]), ["DarkSalmon", "BlanchedAlmond", "LavenderBlush", "PaleTurqoise", "FireBrick"], "<code>htmlColorNames</code> should return <code>["DarkSalmon", "BlanchedAlmond", "LavenderBlush", "PaleTurqoise", "FireBrick"]</code>");'
+  - text: <code>htmlColorNames</code> should return <code>["DarkSalmon", "BlanchedAlmond", "LavenderBlush", "PaleTurqoise", "FireBrick"]</code>
+    testString: assert.deepEqual(htmlColorNames(['DarkGoldenRod', 'WhiteSmoke', 'LavenderBlush', 'PaleTurqoise', 'FireBrick']), ['DarkSalmon', 'BlanchedAlmond', 'LavenderBlush', 'PaleTurqoise', 'FireBrick'], '<code>htmlColorNames</code> should return <code>["DarkSalmon", "BlanchedAlmond", "LavenderBlush", "PaleTurqoise", "FireBrick"]</code>');
   - text: The <code>htmlColorNames</code> function should utilize the <code>splice()</code> method
-    testString: 'assert(/.splice/.test(code), "The <code>htmlColorNames</code> function should utilize the <code>splice()</code> method");'
+    testString: assert(/.splice/.test(code), 'The <code>htmlColorNames</code> function should utilize the <code>splice()</code> method');
   - text: You should not use <code>shift()</code> or <code>unshift()</code>.
-    testString: 'assert(!/shift|unshift/.test(code), "You should not use <code>shift()</code> or <code>unshift()</code>.");'
+    testString: assert(!/shift|unshift/.test(code), 'You should not use <code>shift()</code> or <code>unshift()</code>.');
   - text: You should not use array bracket notation.
-    testString: 'assert(!/\[\d\]\s*=/.test(code), "You should not use array bracket notation.");'
+    testString: assert(!/\[\d\]\s*=/.test(code), 'You should not use array bracket notation.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-key-value-pairs-to-javascript-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-key-value-pairs-to-javascript-objects.english.md
index 0476351d0f..0630018280 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-key-value-pairs-to-javascript-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/add-key-value-pairs-to-javascript-objects.english.md
@@ -26,15 +26,15 @@ Using the same syntax, we can also <em><strong>add new</strong></em> key-value p
 ```yml
 tests:
   - text: <code>foods</code> is an object
-    testString: 'assert(typeof foods === "object", "<code>foods</code> is an object");'
+    testString: assert(typeof foods === 'object', '<code>foods</code> is an object');
   - text: The <code>foods</code> object has a key <code>"bananas"</code> with a value of <code>13</code>
-    testString: 'assert(foods.bananas === 13, "The <code>foods</code> object has a key <code>"bananas"</code> with a value of <code>13</code>");'
+    testString: assert(foods.bananas === 13, 'The <code>foods</code> object has a key <code>"bananas"</code> with a value of <code>13</code>');
   - text: The <code>foods</code> object has a key <code>"grapes"</code> with a value of <code>35</code>
-    testString: 'assert(foods.grapes === 35, "The <code>foods</code> object has a key <code>"grapes"</code> with a value of <code>35</code>");'
+    testString: assert(foods.grapes === 35, 'The <code>foods</code> object has a key <code>"grapes"</code> with a value of <code>35</code>');
   - text: The <code>foods</code> object has a key <code>"strawberries"</code> with a value of <code>27</code>
-    testString: 'assert(foods.strawberries === 27, "The <code>foods</code> object has a key <code>"strawberries"</code> with a value of <code>27</code>");'
+    testString: assert(foods.strawberries === 27, 'The <code>foods</code> object has a key <code>"strawberries"</code> with a value of <code>27</code>');
   - text: The key-value pairs should be set using dot or bracket notation
-    testString: 'assert(code.search(/bananas:/) === -1 && code.search(/grapes:/) === -1 && code.search(/strawberries:/) === -1, "The key-value pairs should be set using dot or bracket notation");'
+    testString: assert(code.search(/bananas:/) === -1 && code.search(/grapes:/) === -1 && code.search(/strawberries:/) === -1, 'The key-value pairs should be set using dot or bracket notation');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md
index b4960e1534..2590343dc0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-for-the-presence-of-an-element-with-indexof.english.md
@@ -21,16 +21,16 @@ For example:
 
 ```yml
 tests:
-  - text: '<code>quickCheck(["squash", "onions", "shallots"], "mushrooms")</code> should return <code>false</code>'
-    testString: 'assert.strictEqual(quickCheck(["squash", "onions", "shallots"], "mushrooms"), false, "<code>quickCheck(["squash", "onions", "shallots"], "mushrooms")</code> should return <code>false</code>");'
-  - text: '<code>quickCheck(["squash", "onions", "shallots"], "onions")</code> should return <code>true</code>'
-    testString: 'assert.strictEqual(quickCheck(["squash", "onions", "shallots"], "onions"), true, "<code>quickCheck(["squash", "onions", "shallots"], "onions")</code> should return <code>true</code>");'
-  - text: '<code>quickCheck([3, 5, 9, 125, 45, 2], 125)</code> should return <code>true</code>'
-    testString: 'assert.strictEqual(quickCheck([3, 5, 9, 125, 45, 2], 125), true, "<code>quickCheck([3, 5, 9, 125, 45, 2], 125)</code> should return <code>true</code>");'
-  - text: '<code>quickCheck([true, false, false], undefined)</code> should return <code>false</code>'
-    testString: 'assert.strictEqual(quickCheck([true, false, false], undefined), false, "<code>quickCheck([true, false, false], undefined)</code> should return <code>false</code>");'
+  - text: <code>quickCheck(["squash", "onions", "shallots"], "mushrooms")</code> should return <code>false</code>
+    testString: assert.strictEqual(quickCheck(['squash', 'onions', 'shallots'], 'mushrooms'), false, '<code>quickCheck(["squash", "onions", "shallots"], "mushrooms")</code> should return <code>false</code>');
+  - text: <code>quickCheck(["squash", "onions", "shallots"], "onions")</code> should return <code>true</code>
+    testString: assert.strictEqual(quickCheck(['squash', 'onions', 'shallots'], 'onions'), true, '<code>quickCheck(["squash", "onions", "shallots"], "onions")</code> should return <code>true</code>');
+  - text: <code>quickCheck([3, 5, 9, 125, 45, 2], 125)</code> should return <code>true</code>
+    testString: assert.strictEqual(quickCheck([3, 5, 9, 125, 45, 2], 125), true, '<code>quickCheck([3, 5, 9, 125, 45, 2], 125)</code> should return <code>true</code>');
+  - text: <code>quickCheck([true, false, false], undefined)</code> should return <code>false</code>
+    testString: assert.strictEqual(quickCheck([true, false, false], undefined), false, '<code>quickCheck([true, false, false], undefined)</code> should return <code>false</code>');
   - text: The <code>quickCheck</code> function should utilize the <code>indexOf()</code> method
-    testString: 'assert.notStrictEqual(quickCheck.toString().search(/\.indexOf\(/), -1, "The <code>quickCheck</code> function should utilize the <code>indexOf()</code> method");'
+    testString: assert.notStrictEqual(quickCheck.toString().search(/\.indexOf\(/), -1, 'The <code>quickCheck</code> function should utilize the <code>indexOf()</code> method');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-if-an-object-has-a-property.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-if-an-object-has-a-property.english.md
index f2857cb35b..a914c44c06 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-if-an-object-has-a-property.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-if-an-object-has-a-property.english.md
@@ -20,12 +20,12 @@ We've created an object, <code>users</code>, with some users in it and a functio
 
 ```yml
 tests:
-  - text: 'The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>'
-    testString: 'assert("Alan" in users && "Jeff" in users && "Sarah" in users && "Ryan" in users && Object.keys(users).length === 4, "The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>");'
-  - text: 'The function <code>isEveryoneHere</code> returns <code>true</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are properties on the <code>users</code> object'
-    testString: 'assert(isEveryoneHere(users) === true, "The function <code>isEveryoneHere</code> returns <code>true</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are properties on the <code>users</code> object");'
-  - text: 'The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are not properties on the <code>users</code> object'
-    testString: 'assert((function() { delete users.Alan; delete users.Jeff; delete users.Sarah; delete users.Ryan; return isEveryoneHere(users) })() === false, "The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are not properties on the <code>users</code> object");'
+  - text: The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>
+    testString: assert('Alan' in users && 'Jeff' in users && 'Sarah' in users && 'Ryan' in users && Object.keys(users).length === 4, 'The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>');
+  - text: The function <code>isEveryoneHere</code> returns <code>true</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are properties on the <code>users</code> object
+    testString: assert(isEveryoneHere(users) === true, 'The function <code>isEveryoneHere</code> returns <code>true</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are properties on the <code>users</code> object');
+  - text: The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are not properties on the <code>users</code> object
+    testString: assert((function() { delete users.Alan; delete users.Jeff; delete users.Sarah; delete users.Ryan; return isEveryoneHere(users) })() === false, 'The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code> are not properties on the <code>users</code> object');
 
 ```
 
@@ -75,6 +75,25 @@ console.log(isEveryoneHere(users));
 <section id='solution'>
 
 ```js
+let users = {
+  Alan: {
+    age: 27,
+    online: true
+  },
+  Jeff: {
+    age: 32,
+    online: true
+  },
+  Sarah: {
+    age: 48,
+    online: true
+  },
+  Ryan: {
+    age: 19,
+    online: true
+  }
+};
+
 function isEveryoneHere(obj) {
   return [
     'Alan',
@@ -83,5 +102,7 @@ function isEveryoneHere(obj) {
     'Ryan'
   ].every(i => obj.hasOwnProperty(i));
 }
+
+console.log(isEveryoneHere(users));
 ```
 </section>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/combine-arrays-with-the-spread-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/combine-arrays-with-the-spread-operator.english.md
index 34d6bfb849..e3c4db5258 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/combine-arrays-with-the-spread-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/combine-arrays-with-the-spread-operator.english.md
@@ -21,10 +21,10 @@ We have defined a function <code>spreadOut</code> that returns the variable <cod
 
 ```yml
 tests:
-  - text: '<code>spreadOut</code> should return <code>["learning", "to", "code", "is", "fun"]</code>'
-    testString: 'assert.deepEqual(spreadOut(), ["learning", "to", "code", "is", "fun"], "<code>spreadOut</code> should return <code>["learning", "to", "code", "is", "fun"]</code>");'
+  - text: <code>spreadOut</code> should return <code>["learning", "to", "code", "is", "fun"]</code>
+    testString: assert.deepEqual(spreadOut(), ['learning', 'to', 'code', 'is', 'fun'], '<code>spreadOut</code> should return <code>["learning", "to", "code", "is", "fun"]</code>');
   - text: The <code>spreadOut</code> function should utilize spread syntax
-    testString: 'assert.notStrictEqual(spreadOut.toString().search(/[...]/), -1, "The <code>spreadOut</code> function should utilize spread syntax");'
+    testString: assert.notStrictEqual(spreadOut.toString().search(/[...]/), -1, 'The <code>spreadOut</code> function should utilize spread syntax');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-an-array-with-the-spread-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-an-array-with-the-spread-operator.english.md
index cd2db406cc..0fb2c32cc7 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-an-array-with-the-spread-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-an-array-with-the-spread-operator.english.md
@@ -21,16 +21,16 @@ We have defined a function, <code>copyMachine</code> which takes <code>arr</code
 
 ```yml
 tests:
-  - text: '<code>copyMachine([true, false, true], 2)</code> should return <code>[[true, false, true], [true, false, true]]</code>'
-    testString: 'assert.deepEqual(copyMachine([true, false, true], 2), [[true, false, true], [true, false, true]], "<code>copyMachine([true, false, true], 2)</code> should return <code>[[true, false, true], [true, false, true]]</code>");'
-  - text: '<code>copyMachine([1, 2, 3], 5)</code> should return <code>[[1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3]]</code>'
-    testString: 'assert.deepEqual(copyMachine([1, 2, 3], 5), [[1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3]], "<code>copyMachine([1, 2, 3], 5)</code> should return <code>[[1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3]]</code>");'
-  - text: '<code>copyMachine([true, true, null], 1)</code> should return <code>[[true, true, null]]</code>'
-    testString: 'assert.deepEqual(copyMachine([true, true, null], 1), [[true, true, null]], "<code>copyMachine([true, true, null], 1)</code> should return <code>[[true, true, null]]</code>");'
-  - text: '<code>copyMachine(["it works"], 3)</code> should return <code>[["it works"], ["it works"], ["it works"]]</code>'
-    testString: 'assert.deepEqual(copyMachine(["it works"], 3), [["it works"], ["it works"], ["it works"]], "<code>copyMachine(["it works"], 3)</code> should return <code>[["it works"], ["it works"], ["it works"]]</code>");'
+  - text: <code>copyMachine([true, false, true], 2)</code> should return <code>[[true, false, true], [true, false, true]]</code>
+    testString: assert.deepEqual(copyMachine([true, false, true], 2), [[true, false, true], [true, false, true]], '<code>copyMachine([true, false, true], 2)</code> should return <code>[[true, false, true], [true, false, true]]</code>');
+  - text: <code>copyMachine([1, 2, 3], 5)</code> should return <code>[[1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3]]</code>
+    testString: assert.deepEqual(copyMachine([1, 2, 3], 5), [[1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3]], '<code>copyMachine([1, 2, 3], 5)</code> should return <code>[[1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3], [1, 2, 3]]</code>');
+  - text: <code>copyMachine([true, true, null], 1)</code> should return <code>[[true, true, null]]</code>
+    testString: assert.deepEqual(copyMachine([true, true, null], 1), [[true, true, null]], '<code>copyMachine([true, true, null], 1)</code> should return <code>[[true, true, null]]</code>');
+  - text: <code>copyMachine(["it works"], 3)</code> should return <code>[["it works"], ["it works"], ["it works"]]</code>
+    testString: assert.deepEqual(copyMachine(['it works'], 3), [['it works'], ['it works'], ['it works']], '<code>copyMachine(["it works"], 3)</code> should return <code>[["it works"], ["it works"], ["it works"]]</code>');
   - text: The <code>copyMachine</code> function should utilize the <code>spread operator</code> with array <code>arr</code>
-    testString: 'assert.notStrictEqual(copyMachine.toString().indexOf(".concat(_toConsumableArray(arr))"), -1, "The <code>copyMachine</code> function should utilize the <code>spread operator</code> with array <code>arr</code>");'
+    testString: assert.notStrictEqual(copyMachine.toString().indexOf('.concat(_toConsumableArray(arr))'), -1, 'The <code>copyMachine</code> function should utilize the <code>spread operator</code> with array <code>arr</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-array-items-using-slice.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-array-items-using-slice.english.md
index b60373f64d..b333ccfc6e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-array-items-using-slice.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/copy-array-items-using-slice.english.md
@@ -21,10 +21,10 @@ We have defined a function, <code>forecast</code>, that takes an array as an arg
 
 ```yml
 tests:
-  - text: '<code>forecast</code> should return <code>["warm", "sunny"]'
-    testString: 'assert.deepEqual(forecast(["cold", "rainy", "warm", "sunny", "cool", "thunderstorms"]), ["warm", "sunny"], "<code>forecast</code> should return <code>["warm", "sunny"]</code>");'
+  - text: <code>forecast</code> should return <code>["warm", "sunny"]
+    testString: assert.deepEqual(forecast(['cold', 'rainy', 'warm', 'sunny', 'cool', 'thunderstorms']), ['warm', 'sunny'], '<code>forecast</code> should return <code>["warm", "sunny"]</code>');
   - text: The <code>forecast</code> function should utilize the <code>slice()</code> method
-    testString: 'assert(/\.slice\(/.test(code), "The <code>forecast</code> function should utilize the <code>slice()</code> method");'
+    testString: assert(/\.slice\(/.test(code), 'The <code>forecast</code> function should utilize the <code>slice()</code> method');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/create-complex-multi-dimensional-arrays.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/create-complex-multi-dimensional-arrays.english.md
index b6bd90a193..149f8380f5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/create-complex-multi-dimensional-arrays.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/create-complex-multi-dimensional-arrays.english.md
@@ -26,16 +26,16 @@ We have defined a variable, <code>myNestedArray</code>, set equal to an array. M
 
 ```yml
 tests:
-  - text: '<code>myNestedArray</code> should contain only numbers, booleans, and strings as data elements'
-    testString: 'assert.strictEqual((function(arr) { let flattened = (function flatten(arr) { const flat = [].concat(...arr); return flat.some (Array.isArray) ? flatten(flat) : flat; })(arr); for (let i = 0; i < flattened.length; i++) { if ( typeof flattened[i] !== "number" && typeof flattened[i] !== "string" && typeof flattened[i] !== "boolean") { return false } } return true })(myNestedArray), true, "<code>myNestedArray</code> should contain only numbers, booleans, and strings as data elements");'
+  - text: <code>myNestedArray</code> should contain only numbers, booleans, and strings as data elements
+    testString: 'assert.strictEqual((function(arr) { let flattened = (function flatten(arr) { const flat = [].concat(...arr); return flat.some (Array.isArray) ? flatten(flat) : flat; })(arr); for (let i = 0; i < flattened.length; i++) { if ( typeof flattened[i] !== ''number'' && typeof flattened[i] !== ''string'' && typeof flattened[i] !== ''boolean'') { return false } } return true })(myNestedArray), true, ''<code>myNestedArray</code> should contain only numbers, booleans, and strings as data elements'');'
   - text: <code>myNestedArray</code> should have exactly 5 levels of depth
-    testString: 'assert.strictEqual((function(arr) {let depth = 0;function arrayDepth(array, i, d) { if (Array.isArray(array[i])) {  arrayDepth(array[i], 0, d + 1);} else {  depth = (d > depth) ? d : depth;}if (i < array.length) {  arrayDepth(array, i + 1, d);}  }arrayDepth(arr, 0, 0);return depth;})(myNestedArray), 4, "<code>myNestedArray</code> should have exactly 5 levels of depth");'
+    testString: 'assert.strictEqual((function(arr) {let depth = 0;function arrayDepth(array, i, d) { if (Array.isArray(array[i])) {  arrayDepth(array[i], 0, d + 1);} else {  depth = (d > depth) ? d : depth;}if (i < array.length) {  arrayDepth(array, i + 1, d);}  }arrayDepth(arr, 0, 0);return depth;})(myNestedArray), 4, ''<code>myNestedArray</code> should have exactly 5 levels of depth'');'
   - text: <code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deep"</code> on an array nested 3 levels deep
-    testString: 'assert((function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, "deep").length === 1 && (function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, "deep")[0] === 2, "<code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deep"</code> on an array nested 3 levels deep");'
+    testString: assert((function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, 'deep').length === 1 && (function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, 'deep')[0] === 2, '<code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deep"</code> on an array nested 3 levels deep');
   - text: <code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deeper"</code> on an array nested 4 levels deep
-    testString: 'assert((function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, "deeper").length === 1 && (function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, "deeper")[0] === 3, "<code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deeper"</code> on an array nested 4 levels deep");'
+    testString: assert((function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, 'deeper').length === 1 && (function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, 'deeper')[0] === 3, '<code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deeper"</code> on an array nested 4 levels deep');
   - text: <code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deepest"</code> on an array nested 5 levels deep
-    testString: 'assert((function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, "deepest").length === 1 && (function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, "deepest")[0] === 4, "<code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deepest"</code> on an array nested 5 levels deep");'
+    testString: assert((function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, 'deepest').length === 1 && (function howDeep(array, target, depth = 0) {return array.reduce((combined, current) => {if (Array.isArray(current)) {  return combined.concat(howDeep(current, target, depth + 1));} else if (current === target) {  return combined.concat(depth);} else {  return combined;}}, []);})(myNestedArray, 'deepest')[0] === 4, '<code>myNestedArray</code> should contain exactly one occurrence of the string <code>"deepest"</code> on an array nested 5 levels deep');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object.keys.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object.keys.english.md
index 9a2125a96f..d451169b6b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object.keys.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object.keys.english.md
@@ -19,10 +19,10 @@ Finish writing the <code>getArrayOfUsers</code> function so that it returns an a
 
 ```yml
 tests:
-  - text: 'The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>'
-    testString: 'assert("Alan" in users && "Jeff" in users && "Sarah" in users && "Ryan" in users && Object.keys(users).length === 4, "The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>");'
+  - text: The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>
+    testString: assert('Alan' in users && 'Jeff' in users && 'Sarah' in users && 'Ryan' in users && Object.keys(users).length === 4, 'The <code>users</code> object only contains the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>');
   - text: The <code>getArrayOfUsers</code> function returns an array which contains all the keys in the <code>users</code> object
-    testString: 'assert((function() { users.Sam = {}; users.Lewis = {}; let R = getArrayOfUsers(users); return (R.indexOf("Alan") !== -1 && R.indexOf("Jeff") !== -1 && R.indexOf("Sarah") !== -1 && R.indexOf("Ryan") !== -1 && R.indexOf("Sam") !== -1 && R.indexOf("Lewis") !== -1); })() === true, "The <code>getArrayOfUsers</code> function returns an array which contains all the keys in the <code>users</code> object");'
+    testString: assert((function() { users.Sam = {}; users.Lewis = {}; let R = getArrayOfUsers(users); return (R.indexOf('Alan') !== -1 && R.indexOf('Jeff') !== -1 && R.indexOf('Sarah') !== -1 && R.indexOf('Ryan') !== -1 && R.indexOf('Sam') !== -1 && R.indexOf('Lewis') !== -1); })() === true, 'The <code>getArrayOfUsers</code> function returns an array which contains all the keys in the <code>users</code> object');
 
 ```
 
@@ -72,8 +72,29 @@ console.log(getArrayOfUsers(users));
 <section id='solution'>
 
 ```js
+let users = {
+  Alan: {
+    age: 27,
+    online: false
+  },
+  Jeff: {
+    age: 32,
+    online: true
+  },
+  Sarah: {
+    age: 48,
+    online: false
+  },
+  Ryan: {
+    age: 19,
+    online: true
+  }
+};
+
 function getArrayOfUsers(obj) {
   return Object.keys(users);
 }
+
+console.log(getArrayOfUsers(users));
 ```
 </section>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops.english.md
index a701ca763d..9f69cf1439 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops.english.md
@@ -22,16 +22,16 @@ We have defined a function, <code>filteredArray</code>, which takes <code>arr</c
 
 ```yml
 tests:
-  - text: '<code>filteredArray([[10, 8, 3], [14, 6, 23], [3, 18, 6]], 18)</code> should return <code>[ [10, 8, 3], [14, 6, 23] ]</code>'
-    testString: 'assert.deepEqual(filteredArray([ [10, 8, 3], [14, 6, 23], [3, 18, 6] ], 18), [[10, 8, 3], [14, 6, 23]], "<code>filteredArray([[10, 8, 3], [14, 6, 23], [3, 18, 6]], 18)</code> should return <code>[ [10, 8, 3], [14, 6, 23] ]</code>");'
-  - text: '<code>filteredArray([ ["trumpets", 2], ["flutes", 4], ["saxophones", 2] ], 2)</code> should return <code>[ ["flutes", 4] ]</code>'
-    testString: 'assert.deepEqual(filteredArray([ ["trumpets", 2], ["flutes", 4], ["saxophones", 2] ], 2), [["flutes", 4]], "<code>filteredArray([ ["trumpets", 2], ["flutes", 4], ["saxophones", 2] ], 2)</code> should return <code>[ ["flutes", 4] ]</code>");'
-  - text: '<code>filteredArray([ ["amy", "beth", "sam"], ["dave", "sean", "peter"] ], "peter")</code> should return <code>[ ["amy", "beth", "sam"] ]</code>'
-    testString: 'assert.deepEqual(filteredArray([["amy", "beth", "sam"], ["dave", "sean", "peter"]], "peter"), [["amy", "beth", "sam"]], "<code>filteredArray([ ["amy", "beth", "sam"], ["dave", "sean", "peter"] ], "peter")</code> should return <code>[ ["amy", "beth", "sam"] ]</code>");'
-  - text: '<code>filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3)</code> should return <code>[ ]</code>'
-    testString: 'assert.deepEqual(filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3), [], "<code>filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3)</code> should return <code>[ ]</code>");'
+  - text: <code>filteredArray([[10, 8, 3], [14, 6, 23], [3, 18, 6]], 18)</code> should return <code>[ [10, 8, 3], [14, 6, 23] ]</code>
+    testString: assert.deepEqual(filteredArray([ [10, 8, 3], [14, 6, 23], [3, 18, 6] ], 18), [[10, 8, 3], [14, 6, 23]], '<code>filteredArray([[10, 8, 3], [14, 6, 23], [3, 18, 6]], 18)</code> should return <code>[ [10, 8, 3], [14, 6, 23] ]</code>');
+  - text: <code>filteredArray([ ["trumpets", 2], ["flutes", 4], ["saxophones", 2] ], 2)</code> should return <code>[ ["flutes", 4] ]</code>
+    testString: assert.deepEqual(filteredArray([ ['trumpets', 2], ['flutes', 4], ['saxophones', 2] ], 2), [['flutes', 4]], '<code>filteredArray([ ["trumpets", 2], ["flutes", 4], ["saxophones", 2] ], 2)</code> should return <code>[ ["flutes", 4] ]</code>');
+  - text: <code>filteredArray([ ["amy", "beth", "sam"], ["dave", "sean", "peter"] ], "peter")</code> should return <code>[ ["amy", "beth", "sam"] ]</code>
+    testString: assert.deepEqual(filteredArray([['amy', 'beth', 'sam'], ['dave', 'sean', 'peter']], 'peter'), [['amy', 'beth', 'sam']], '<code>filteredArray([ ["amy", "beth", "sam"], ["dave", "sean", "peter"] ], "peter")</code> should return <code>[ ["amy", "beth", "sam"] ]</code>');
+  - text: <code>filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3)</code> should return <code>[ ]</code>
+    testString: assert.deepEqual(filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3), [], '<code>filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3)</code> should return <code>[ ]</code>');
   - text: The <code>filteredArray</code> function should utilize a <code>for</code> loop
-    testString: 'assert.notStrictEqual(filteredArray.toString().search(/for/), -1, "The <code>filteredArray</code> function should utilize a <code>for</code> loop");'
+    testString: assert.notStrictEqual(filteredArray.toString().search(/for/), -1, 'The <code>filteredArray</code> function should utilize a <code>for</code> loop');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-array-stored-in-an-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-array-stored-in-an-object.english.md
index 8cc007e696..fb22f53f0d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-array-stored-in-an-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-array-stored-in-an-object.english.md
@@ -19,12 +19,12 @@ Take a look at the object we've provided in the code editor. The <code>user</cod
 
 ```yml
 tests:
-  - text: 'The <code>user</code> object has <code>name</code>, <code>age</code>, and <code>data</code> keys'
-    testString: 'assert("name" in user && "age" in user && "data" in user, "The <code>user</code> object has <code>name</code>, <code>age</code>, and <code>data</code> keys");'
+  - text: The <code>user</code> object has <code>name</code>, <code>age</code>, and <code>data</code> keys
+    testString: assert('name' in user && 'age' in user && 'data' in user, 'The <code>user</code> object has <code>name</code>, <code>age</code>, and <code>data</code> keys');
   - text: The <code>addFriend</code> function accepts a <code>user</code> object and a <code>friend</code> string as arguments and adds the friend to the array of <code>friends</code> in the <code>user</code> object
-    testString: 'assert((function() { let L1 = user.data.friends.length; addFriend(user, "Sean"); let L2 = user.data.friends.length; return (L2 === L1 + 1); })(), "The <code>addFriend</code> function accepts a <code>user</code> object and a <code>friend</code> string as arguments and adds the friend to the array of <code>friends</code> in the <code>user</code> object");'
-  - text: '<code>addFriend(user, "Pete")</code> should return <code>["Sam", "Kira", "Tomo", "Pete"]</code>'
-    testString: 'assert.deepEqual((function() { delete user.data.friends; user.data.friends = ["Sam", "Kira", "Tomo"]; return addFriend(user, "Pete") })(), ["Sam", "Kira", "Tomo", "Pete"], "<code>addFriend(user, "Pete")</code> should return <code>["Sam", "Kira", "Tomo", "Pete"]</code>");'
+    testString: assert((function() { let L1 = user.data.friends.length; addFriend(user, 'Sean'); let L2 = user.data.friends.length; return (L2 === L1 + 1); })(), 'The <code>addFriend</code> function accepts a <code>user</code> object and a <code>friend</code> string as arguments and adds the friend to the array of <code>friends</code> in the <code>user</code> object');
+  - text: <code>addFriend(user, "Pete")</code> should return <code>["Sam", "Kira", "Tomo", "Pete"]</code>
+    testString: assert.deepEqual((function() { delete user.data.friends; user.data.friends = ['Sam', 'Kira', 'Tomo']; return addFriend(user, 'Pete') })(), ['Sam', 'Kira', 'Tomo', 'Pete'], '<code>addFriend(user, "Pete")</code> should return <code>["Sam", "Kira", "Tomo", "Pete"]</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-object-nested-within-an-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-object-nested-within-an-object.english.md
index 5901580176..a0737f48ea 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-object-nested-within-an-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/modify-an-object-nested-within-an-object.english.md
@@ -21,14 +21,14 @@ Here we've defined an object, <code>userActivity</code>, which includes another
 
 ```yml
 tests:
-  - text: '<code>userActivity</code> has <code>id</code>, <code>date</code> and <code>data</code> properties'
-    testString: 'assert("id" in userActivity && "date" in userActivity && "data" in userActivity, "<code>userActivity</code> has <code>id</code>, <code>date</code> and <code>data</code> properties");'
+  - text: <code>userActivity</code> has <code>id</code>, <code>date</code> and <code>data</code> properties
+    testString: assert('id' in userActivity && 'date' in userActivity && 'data' in userActivity, '<code>userActivity</code> has <code>id</code>, <code>date</code> and <code>data</code> properties');
   - text: <code>userActivity</code> has a <code>data</code> key set to an object with keys <code>totalUsers</code> and <code>online</code>
-    testString: 'assert("totalUsers" in userActivity.data && "online" in userActivity.data, "<code>userActivity</code> has a <code>data</code> key set to an object with keys <code>totalUsers</code> and <code>online</code>");'
+    testString: assert('totalUsers' in userActivity.data && 'online' in userActivity.data, '<code>userActivity</code> has a <code>data</code> key set to an object with keys <code>totalUsers</code> and <code>online</code>');
   - text: The <code>online</code> property nested in the <code>data</code> key of <code>userActivity</code> should be set to <code>45</code>
-    testString: 'assert(userActivity.data.online === 45, "The <code>online</code> property nested in the <code>data</code> key of <code>userActivity</code> should be set to <code>45</code>");'
+    testString: assert(userActivity.data.online === 45, 'The <code>online</code> property nested in the <code>data</code> key of <code>userActivity</code> should be set to <code>45</code>');
   - text: The <code>online</code> property is set using dot or bracket notation
-    testString: 'assert.strictEqual(code.search(/online: 45/), -1, "The <code>online</code> property is set using dot or bracket notation");'
+    testString: 'assert.strictEqual(code.search(/online: 45/), -1, ''The <code>online</code> property is set using dot or bracket notation'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-from-an-array-with-pop-and-shift.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-from-an-array-with-pop-and-shift.english.md
index de1d5bfb0c..99cb66eb8d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-from-an-array-with-pop-and-shift.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-from-an-array-with-pop-and-shift.english.md
@@ -23,12 +23,12 @@ We have defined a function, <code>popShift</code>, which takes an array as an ar
 
 ```yml
 tests:
-  - text: '<code>popShift(["challenge", "is", "not", "complete"])</code> should return <code>["challenge", "complete"]</code>'
-    testString: 'assert.deepEqual(popShift(["challenge", "is", "not", "complete"]), ["challenge", "complete"], "<code>popShift(["challenge", "is", "not", "complete"])</code> should return <code>["challenge", "complete"]</code>");'
+  - text: <code>popShift(["challenge", "is", "not", "complete"])</code> should return <code>["challenge", "complete"]</code>
+    testString: assert.deepEqual(popShift(['challenge', 'is', 'not', 'complete']), ["challenge", "complete"], '<code>popShift(["challenge", "is", "not", "complete"])</code> should return <code>["challenge", "complete"]</code>');
   - text: The <code>popShift</code> function should utilize the <code>pop()</code> method
-    testString: 'assert.notStrictEqual(popShift.toString().search(/\.pop\(/), -1, "The <code>popShift</code> function should utilize the <code>pop()</code> method");'
+    testString: assert.notStrictEqual(popShift.toString().search(/\.pop\(/), -1, 'The <code>popShift</code> function should utilize the <code>pop()</code> method');
   - text: The <code>popShift</code> function should utilize the <code>shift()</code> method
-    testString: 'assert.notStrictEqual(popShift.toString().search(/\.shift\(/), -1, "The <code>popShift</code> function should utilize the <code>shift()</code> method");'
+    testString: assert.notStrictEqual(popShift.toString().search(/\.shift\(/), -1, 'The <code>popShift</code> function should utilize the <code>shift()</code> method');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-using-splice.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-using-splice.english.md
index a93f1d8ece..6f077e6b9e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-using-splice.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/remove-items-using-splice.english.md
@@ -24,9 +24,9 @@ We've defined a function, <code>sumOfTen</code>, which takes an array as an argu
 ```yml
 tests:
   - text: <code>sumOfTen</code> should return 10
-    testString: 'assert.strictEqual(sumOfTen([2, 5, 1, 5, 2, 1]), 10, "<code>sumOfTen</code> should return 10");'
+    testString: assert.strictEqual(sumOfTen([2, 5, 1, 5, 2, 1]), 10, '<code>sumOfTen</code> should return 10');
   - text: The <code>sumOfTen</code> function should utilize the <code>splice()</code> method
-    testString: 'assert.notStrictEqual(sumOfTen.toString().search(/\.splice\(/), -1, "The <code>sumOfTen</code> function should utilize the <code>splice()</code> method");'
+    testString: assert.notStrictEqual(sumOfTen.toString().search(/\.splice\(/), -1, 'The <code>sumOfTen</code> function should utilize the <code>splice()</code> method');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-an-array-to-store-a-collection-of-data.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-an-array-to-store-a-collection-of-data.english.md
index 8df6cae46b..c1b40b25e2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-an-array-to-store-a-collection-of-data.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-an-array-to-store-a-collection-of-data.english.md
@@ -24,15 +24,15 @@ We have defined a variable called <code>yourArray</code>. Complete the statement
 ```yml
 tests:
   - text: yourArray is an array
-    testString: 'assert.strictEqual(Array.isArray(yourArray), true, "yourArray is an array");'
+    testString: assert.strictEqual(Array.isArray(yourArray), true, 'yourArray is an array');
   - text: <code>yourArray</code> is at least 5 elements long
-    testString: 'assert.isAtLeast(yourArray.length, 5, "<code>yourArray</code> is at least 5 elements long");'
+    testString: assert.isAtLeast(yourArray.length, 5, '<code>yourArray</code> is at least 5 elements long');
   - text: <code>yourArray</code> contains at least one <code>boolean</code>
-    testString: 'assert(yourArray.filter( el => typeof el === "boolean").length >= 1, "<code>yourArray</code> contains at least one <code>boolean</code>");'
+    testString: assert(yourArray.filter( el => typeof el === 'boolean').length >= 1, '<code>yourArray</code> contains at least one <code>boolean</code>');
   - text: <code>yourArray</code> contains at least one <code>number</code>
-    testString: 'assert(yourArray.filter( el => typeof el === "number").length >= 1, "<code>yourArray</code> contains at least one <code>number</code>");'
+    testString: assert(yourArray.filter( el => typeof el === 'number').length >= 1, '<code>yourArray</code> contains at least one <code>number</code>');
   - text: <code>yourArray</code> contains at least one <code>string</code>
-    testString: 'assert(yourArray.filter( el => typeof el === "string").length >= 1, "<code>yourArray</code> contains at least one <code>string</code>");'
+    testString: assert(yourArray.filter( el => typeof el === 'string').length >= 1, '<code>yourArray</code> contains at least one <code>string</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-the-delete-keyword-to-remove-object-properties.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-the-delete-keyword-to-remove-object-properties.english.md
index dac67c3721..1fa4930518 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-the-delete-keyword-to-remove-object-properties.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/use-the-delete-keyword-to-remove-object-properties.english.md
@@ -23,9 +23,9 @@ Use the delete keyword to remove the <code>oranges</code>, <code>plums</code>, a
 ```yml
 tests:
   - text: 'The <code>foods</code> object only has three keys: <code>apples</code>, <code>grapes</code>, and <code>bananas</code>'
-    testString: 'assert(!foods.hasOwnProperty("oranges") && !foods.hasOwnProperty("plums") && !foods.hasOwnProperty("strawberries") && Object.keys(foods).length === 3, "The <code>foods</code> object only has three keys: <code>apples</code>, <code>grapes</code>, and <code>bananas</code>");'
-  - text: 'The <code>oranges</code>, <code>plums</code>, and <code>strawberries</code> keys are removed using <code>delete</code>'
-    testString: 'assert(code.search(/oranges:/) !== -1 && code.search(/plums:/) !== -1 && code.search(/strawberries:/) !== -1, "The <code>oranges</code>, <code>plums</code>, and <code>strawberries</code> keys are removed using <code>delete</code>");'
+    testString: 'assert(!foods.hasOwnProperty(''oranges'') && !foods.hasOwnProperty(''plums'') && !foods.hasOwnProperty(''strawberries'') && Object.keys(foods).length === 3, ''The <code>foods</code> object only has three keys: <code>apples</code>, <code>grapes</code>, and <code>bananas</code>'');'
+  - text: The <code>oranges</code>, <code>plums</code>, and <code>strawberries</code> keys are removed using <code>delete</code>
+    testString: assert(code.search(/oranges:/) !== -1 && code.search(/plums:/) !== -1 && code.search(/strawberries:/) !== -1, 'The <code>oranges</code>, <code>plums</code>, and <code>strawberries</code> keys are removed using <code>delete</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-array-data-with-indexes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-array-data-with-indexes.english.md
index 89eddc490b..1bc915a9ec 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-array-data-with-indexes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-array-data-with-indexes.english.md
@@ -25,9 +25,9 @@ Create a variable called <code>myData</code> and set it to equal the first value
 ```yml
 tests:
   - text: The variable <code>myData</code> should equal the first value of <code>myArray</code>.
-    testString: 'assert((function(){if(typeof myArray !== "undefined" && typeof myData !== "undefined" && myArray[0] === myData){return true;}else{return false;}})(), "The variable <code>myData</code> should equal the first value of <code>myArray</code>.");'
+    testString: assert((function(){if(typeof myArray !== 'undefined' && typeof myData !== 'undefined' && myArray[0] === myData){return true;}else{return false;}})(), 'The variable <code>myData</code> should equal the first value of <code>myArray</code>.');
   - text: The data in variable <code>myArray</code> should be accessed using bracket notation.
-    testString: 'assert((function(){if(code.match(/\s*=\s*myArray\[0\]/g)){return true;}else{return false;}})(), "The data in variable <code>myArray</code> should be accessed using bracket notation.");'
+    testString: assert((function(){if(code.match(/\s*=\s*myArray\[0\]/g)){return true;}else{return false;}})(), 'The data in variable <code>myArray</code> should be accessed using bracket notation.');
 
 ```
 
@@ -57,7 +57,7 @@ var myArray = [50,60,70];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined" && typeof myData !== "undefined"){(function(y,z){return 'myArray = ' + JSON.stringify(y) + ', myData = ' + JSON.stringify(z);})(myArray, myData);}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-multi-dimensional-arrays-with-indexes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-multi-dimensional-arrays-with-indexes.english.md
index dcb65a12e0..178e279c0c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-multi-dimensional-arrays-with-indexes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/access-multi-dimensional-arrays-with-indexes.english.md
@@ -24,9 +24,9 @@ Using bracket notation select an element from <code>myArray</code> such that <co
 ```yml
 tests:
   - text: <code>myData</code> should be equal to <code>8</code>.
-    testString: 'assert(myData === 8, "<code>myData</code> should be equal to <code>8</code>.");'
+    testString: assert(myData === 8, '<code>myData</code> should be equal to <code>8</code>.');
   - text: You should be using bracket notation to read the correct value from <code>myArray</code>.
-    testString: 'assert(/myArray\[2\]\[1\]/g.test(code) && !/myData\s*=\s*(?:.*[-+*/%]|\d)/g.test(code), "You should be using bracket notation to read the correct value from <code>myArray</code>.");'
+    testString: assert(/myArray\[2\]\[1\]/g.test(code) && !/myData\s*=\s*(?:.*[-+*/%]|\d)/g.test(code), 'You should be using bracket notation to read the correct value from <code>myArray</code>.');
 
 ```
 
@@ -53,7 +53,7 @@ var myData = myArray[0][0];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return "myData: " + myData + " myArray: " + JSON.stringify(myArray);})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-arrays.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-arrays.english.md
index 2cf199661d..b993f2c819 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-arrays.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-arrays.english.md
@@ -23,9 +23,9 @@ Retrieve the second tree from the variable <code>myPlants</code> using object do
 ```yml
 tests:
   - text: <code>secondTree</code> should equal "pine"
-    testString: 'assert(secondTree === "pine", "<code>secondTree</code> should equal "pine"");'
+    testString: assert(secondTree === "pine", '<code>secondTree</code> should equal "pine"');
   - text: Use dot and bracket notation to access <code>myPlants</code>
-    testString: 'assert(/=\s*myPlants\[1\].list\[1\]/.test(code), "Use dot and bracket notation to access <code>myPlants</code>");'
+    testString: assert(/=\s*myPlants\[1\].list\[1\]/.test(code), 'Use dot and bracket notation to access <code>myPlants</code>');
 
 ```
 
@@ -70,7 +70,12 @@ var secondTree = ""; // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(x) {
+  if(typeof x != 'undefined') {
+    return "secondTree = " + x;
+  }
+  return "secondTree is undefined";
+})(secondTree);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-objects.english.md
index 9789bfc37d..4b321b3f8c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-nested-objects.english.md
@@ -23,9 +23,9 @@ Access the <code>myStorage</code> object and assign the contents of the <code>gl
 ```yml
 tests:
   - text: <code>gloveBoxContents</code> should equal "maps"
-    testString: 'assert(gloveBoxContents === "maps", "<code>gloveBoxContents</code> should equal "maps"");'
+    testString: assert(gloveBoxContents === "maps", '<code>gloveBoxContents</code> should equal "maps"');
   - text: Use dot and bracket notation to access <code>myStorage</code>
-    testString: 'assert(/=\s*myStorage\.car\.inside\[\s*("|")glove box\1\s*\]/g.test(code), "Use dot and bracket notation to access <code>myStorage</code>");'
+    testString: assert(/=\s*myStorage\.car\.inside\[\s*("|')glove box\1\s*\]/g.test(code), 'Use dot and bracket notation to access <code>myStorage</code>');
 
 ```
 
@@ -61,7 +61,12 @@ var gloveBoxContents = undefined; // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(x) { 
+  if(typeof x != 'undefined') { 
+    return "gloveBoxContents = " + x;
+  }
+  return "gloveBoxContents is undefined";
+})(gloveBoxContents);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-bracket-notation.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-bracket-notation.english.md
index 0d22ffa574..b81f19031e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-bracket-notation.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-bracket-notation.english.md
@@ -25,15 +25,15 @@ Read the values of the properties <code>"an entree"</code> and <code>"the drink"
 ```yml
 tests:
   - text: <code>entreeValue</code> should be a string
-    testString: 'assert(typeof entreeValue === "string" , "<code>entreeValue</code> should be a string");'
+    testString: assert(typeof entreeValue === 'string' , '<code>entreeValue</code> should be a string');
   - text: The value of <code>entreeValue</code> should be <code>"hamburger"</code>
-    testString: 'assert(entreeValue === "hamburger" , "The value of <code>entreeValue</code> should be <code>"hamburger"</code>");'
+    testString: assert(entreeValue === 'hamburger' , 'The value of <code>entreeValue</code> should be <code>"hamburger"</code>');
   - text: <code>drinkValue</code> should be a string
-    testString: 'assert(typeof drinkValue === "string" , "<code>drinkValue</code> should be a string");'
+    testString: assert(typeof drinkValue === 'string' , '<code>drinkValue</code> should be a string');
   - text: The value of <code>drinkValue</code> should be <code>"water"</code>
-    testString: 'assert(drinkValue === "water" , "The value of <code>drinkValue</code> should be <code>"water"</code>");'
+    testString: assert(drinkValue === 'water' , 'The value of <code>drinkValue</code> should be <code>"water"</code>');
   - text: You should use bracket notation twice
-    testString: 'assert(code.match(/testObj\s*?\[("|")[^""]+\1\]/g).length > 1, "You should use bracket notation twice");'
+    testString: assert(code.match(/testObj\s*?\[('|")[^'"]+\1\]/g).length > 1, 'You should use bracket notation twice');
 
 ```
 
@@ -65,7 +65,7 @@ var drinkValue = testObj;    // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b) { return "entreeValue = '" + a + "', drinkValue = '" + b + "'"; })(entreeValue,drinkValue);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-dot-notation.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-dot-notation.english.md
index 0de64f5b8b..dabd66974e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-dot-notation.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-dot-notation.english.md
@@ -23,15 +23,15 @@ Read in the property values of <code>testObj</code> using dot notation. Set the
 ```yml
 tests:
   - text: <code>hatValue</code> should be a string
-    testString: 'assert(typeof hatValue === "string" , "<code>hatValue</code> should be a string");'
+    testString: assert(typeof hatValue === 'string' , '<code>hatValue</code> should be a string');
   - text: The value of <code>hatValue</code> should be <code>"ballcap"</code>
-    testString: 'assert(hatValue === "ballcap" , "The value of <code>hatValue</code> should be <code>"ballcap"</code>");'
+    testString: assert(hatValue === 'ballcap' , 'The value of <code>hatValue</code> should be <code>"ballcap"</code>');
   - text: <code>shirtValue</code> should be a string
-    testString: 'assert(typeof shirtValue === "string" , "<code>shirtValue</code> should be a string");'
+    testString: assert(typeof shirtValue === 'string' , '<code>shirtValue</code> should be a string');
   - text: The value of <code>shirtValue</code> should be <code>"jersey"</code>
-    testString: 'assert(shirtValue === "jersey" , "The value of <code>shirtValue</code> should be <code>"jersey"</code>");'
+    testString: assert(shirtValue === 'jersey' , 'The value of <code>shirtValue</code> should be <code>"jersey"</code>');
   - text: You should use dot notation twice
-    testString: 'assert(code.match(/testObj\.\w+/g).length > 1, "You should use dot notation twice");'
+    testString: assert(code.match(/testObj\.\w+/g).length > 1, 'You should use dot notation twice');
 
 ```
 
@@ -63,7 +63,7 @@ var shirtValue = testObj;    // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b) { return "hatValue = '" + a + "', shirtValue = '" + b + "'"; })(hatValue,shirtValue);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-variables.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-variables.english.md
index c43840db92..1e736d4a7e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-variables.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-variables.english.md
@@ -28,17 +28,17 @@ Use the <code>playerNumber</code> variable to look up player <code>16</code> in
 ```yml
 tests:
   - text: <code>playerNumber</code> should be a number
-    testString: 'assert(typeof playerNumber === "number", "<code>playerNumber</code> should be a number");'
+    testString: assert(typeof playerNumber === 'number', '<code>playerNumber</code> should be a number');
   - text: The variable <code>player</code> should be a string
-    testString: 'assert(typeof player === "string", "The variable <code>player</code> should be a string");'
+    testString: assert(typeof player === 'string', 'The variable <code>player</code> should be a string');
   - text: The value of <code>player</code> should be "Montana"
-    testString: 'assert(player === "Montana", "The value of <code>player</code> should be "Montana"");'
+    testString: assert(player === 'Montana', 'The value of <code>player</code> should be "Montana"');
   - text: You should use bracket notation to access <code>testObj</code>
-    testString: 'assert(/testObj\s*?\[.*?\]/.test(code),"You should use bracket notation to access <code>testObj</code>");'
+    testString: assert(/testObj\s*?\[.*?\]/.test(code),'You should use bracket notation to access <code>testObj</code>');
   - text: You should not assign the value <code>Montana</code> to the variable <code>player</code> directly.
-    testString: 'assert(!code.match(/player\s*=\s*"|\"\s*Montana\s*"|\"\s*;/gi),"You should not assign the value <code>Montana</code> to the variable <code>player</code> directly.");'
+    testString: assert(!code.match(/player\s*=\s*"|\'\s*Montana\s*"|\'\s*;/gi),'You should not assign the value <code>Montana</code> to the variable <code>player</code> directly.');
   - text: You should be using the variable <code>playerNumber</code> in your bracket notation
-    testString: 'assert(/testObj\s*?\[\s*playerNumber\s*\]/.test(code),"You should be using the variable <code>playerNumber</code> in your bracket notation");'
+    testString: assert(/testObj\s*?\[\s*playerNumber\s*\]/.test(code),'You should be using the variable <code>playerNumber</code> in your bracket notation');
 
 ```
 
@@ -70,7 +70,7 @@ var player = testObj;   // Change this Line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof player !== "undefined"){(function(v){return v;})(player);}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-new-properties-to-a-javascript-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-new-properties-to-a-javascript-object.english.md
index 4bd952ed40..adfedf3fe8 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-new-properties-to-a-javascript-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-new-properties-to-a-javascript-object.english.md
@@ -25,9 +25,9 @@ Add a <code>"bark"</code> property to <code>myDog</code> and set it to a dog sou
 ```yml
 tests:
   - text: Add the property <code>"bark"</code> to <code>myDog</code>.
-    testString: 'assert(myDog.bark !== undefined, "Add the property <code>"bark"</code> to <code>myDog</code>.");'
+    testString: assert(myDog.bark !== undefined, 'Add the property <code>"bark"</code> to <code>myDog</code>.');
   - text: Do not add <code>"bark"</code> to the setup section
-    testString: 'assert(!/bark[^\n]:/.test(code), "Do not add <code>"bark"</code> to the setup section");'
+    testString: assert(!/bark[^\n]:/.test(code), 'Do not add <code>"bark"</code> to the setup section');
 
 ```
 
@@ -68,7 +68,7 @@ var myDog = {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return z;})(myDog);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-two-numbers-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-two-numbers-with-javascript.english.md
index 8461812d99..87c1a64eeb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-two-numbers-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/add-two-numbers-with-javascript.english.md
@@ -24,9 +24,9 @@ Change the <code>0</code> so that sum will equal <code>20</code>.
 ```yml
 tests:
   - text: <code>sum</code> should equal <code>20</code>
-    testString: 'assert(sum === 20, "<code>sum</code> should equal <code>20</code>");'
+    testString: assert(sum === 20, '<code>sum</code> should equal <code>20</code>');
   - text: Use the <code>+</code> operator
-    testString: 'assert(/\+/.test(code), "Use the <code>+</code> operator");'
+    testString: assert(/\+/.test(code), 'Use the <code>+</code> operator');
 
 ```
 
@@ -49,7 +49,7 @@ var sum = 10 + 0;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'sum = '+z;})(sum);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/adding-a-default-option-in-switch-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/adding-a-default-option-in-switch-statements.english.md
index 3b7891ff43..e902dbee45 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/adding-a-default-option-in-switch-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/adding-a-default-option-in-switch-statements.english.md
@@ -23,21 +23,21 @@ Write a switch statement to set <code>answer</code> for the following conditions
 ```yml
 tests:
   - text: <code>switchOfStuff("a")</code> should have a value of "apple"
-    testString: 'assert(switchOfStuff("a") === "apple", "<code>switchOfStuff("a")</code> should have a value of "apple"");'
+    testString: assert(switchOfStuff("a") === "apple", '<code>switchOfStuff("a")</code> should have a value of "apple"');
   - text: <code>switchOfStuff("b")</code> should have a value of "bird"
-    testString: 'assert(switchOfStuff("b") === "bird", "<code>switchOfStuff("b")</code> should have a value of "bird"");'
+    testString: assert(switchOfStuff("b") === "bird", '<code>switchOfStuff("b")</code> should have a value of "bird"');
   - text: <code>switchOfStuff("c")</code> should have a value of "cat"
-    testString: 'assert(switchOfStuff("c") === "cat", "<code>switchOfStuff("c")</code> should have a value of "cat"");'
+    testString: assert(switchOfStuff("c") === "cat", '<code>switchOfStuff("c")</code> should have a value of "cat"');
   - text: <code>switchOfStuff("d")</code> should have a value of "stuff"
-    testString: 'assert(switchOfStuff("d") === "stuff", "<code>switchOfStuff("d")</code> should have a value of "stuff"");'
+    testString: assert(switchOfStuff("d") === "stuff", '<code>switchOfStuff("d")</code> should have a value of "stuff"');
   - text: <code>switchOfStuff(4)</code> should have a value of "stuff"
-    testString: 'assert(switchOfStuff(4) === "stuff", "<code>switchOfStuff(4)</code> should have a value of "stuff"");'
+    testString: assert(switchOfStuff(4) === "stuff", '<code>switchOfStuff(4)</code> should have a value of "stuff"');
   - text: You should not use any <code>if</code> or <code>else</code> statements
-    testString: 'assert(!/else/g.test(code) || !/if/g.test(code), "You should not use any <code>if</code> or <code>else</code> statements");'
+    testString: assert(!/else/g.test(code) || !/if/g.test(code), 'You should not use any <code>if</code> or <code>else</code> statements');
   - text: You should use a <code>default</code> statement
-    testString: 'assert(switchOfStuff("string-to-trigger-default-case") === "stuff", "You should use a <code>default</code> statement");'
+    testString: assert(switchOfStuff("string-to-trigger-default-case") === "stuff", 'You should use a <code>default</code> statement');
   - text: You should have at least 3 <code>break</code> statements
-    testString: 'assert(code.match(/break/g).length > 2, "You should have at least 3 <code>break</code> statements");'
+    testString: assert(code.match(/break/g).length > 2, 'You should have at least 3 <code>break</code> statements');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/appending-variables-to-strings.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/appending-variables-to-strings.english.md
index e1f9964d45..d2d8fb5b77 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/appending-variables-to-strings.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/appending-variables-to-strings.english.md
@@ -21,9 +21,9 @@ Set <code>someAdjective</code> and append it to <code>myStr</code> using the <co
 ```yml
 tests:
   - text: <code>someAdjective</code> should be set to a string at least 3 characters long
-    testString: 'assert(typeof someAdjective !== "undefined" && someAdjective.length > 2, "<code>someAdjective</code> should be set to a string at least 3 characters long");'
+    testString: assert(typeof someAdjective !== 'undefined' && someAdjective.length > 2, '<code>someAdjective</code> should be set to a string at least 3 characters long');
   - text: Append <code>someAdjective</code> to <code>myStr</code> using the <code>+=</code> operator
-    testString: 'assert(code.match(/myStr\s*\+=\s*someAdjective\s*/).length > 0, "Append <code>someAdjective</code> to <code>myStr</code> using the <code>+=</code> operator");'
+    testString: assert(code.match(/myStr\s*\+=\s*someAdjective\s*/).length > 0, 'Append <code>someAdjective</code> to <code>myStr</code> using the <code>+=</code> operator');
 
 ```
 
@@ -54,7 +54,20 @@ var myStr = "Learning to code is ";
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){
+  var output = [];
+  if(typeof someAdjective === 'string') {
+    output.push('someAdjective = "' + someAdjective + '"');
+  } else {
+    output.push('someAdjective is not a string');
+  }
+  if(typeof myStr === 'string') {
+    output.push('myStr = "' + myStr + '"');
+  } else {
+    output.push('myStr is not a string');
+  }
+  return output.join('\n');
+})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/assignment-with-a-returned-value.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/assignment-with-a-returned-value.english.md
index e5e5b5b641..fee33b0c4b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/assignment-with-a-returned-value.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/assignment-with-a-returned-value.english.md
@@ -24,9 +24,9 @@ Call the <code>processArg</code> function with an argument of <code>7</code> and
 ```yml
 tests:
   - text: <code>processed</code> should have a value of <code>2</code>
-    testString: 'assert(processed === 2, "<code>processed</code> should have a value of <code>2</code>");'
+    testString: assert(processed === 2, '<code>processed</code> should have a value of <code>2</code>');
   - text: You should assign <code>processArg</code> to <code>processed</code>
-    testString: 'assert(/processed\s*=\s*processArg\(\s*7\s*\)\s*;/.test(code), "You should assign <code>processArg</code> to <code>processed</code>");'
+    testString: assert(/processed\s*=\s*processArg\(\s*7\s*\)\s*;/.test(code), 'You should assign <code>processArg</code> to <code>processed</code>');
 
 ```
 
@@ -66,7 +66,7 @@ function processArg(num) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){return "processed = " + processed})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/build-javascript-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/build-javascript-objects.english.md
index 30de8e698f..9e8d7a566f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/build-javascript-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/build-javascript-objects.english.md
@@ -28,15 +28,15 @@ You can set these object properties to whatever values you want, as long <code>"
 ```yml
 tests:
   - text: <code>myDog</code> should contain the property <code>name</code> and it should be a <code>string</code>.
-    testString: 'assert((function(z){if(z.hasOwnProperty("name") && z.name !== undefined && typeof z.name === "string"){return true;}else{return false;}})(myDog), "<code>myDog</code> should contain the property <code>name</code> and it should be a <code>string</code>.");'
+    testString: assert((function(z){if(z.hasOwnProperty("name") && z.name !== undefined && typeof z.name === "string"){return true;}else{return false;}})(myDog), '<code>myDog</code> should contain the property <code>name</code> and it should be a <code>string</code>.');
   - text: <code>myDog</code> should contain the property <code>legs</code> and it should be a <code>number</code>.
-    testString: 'assert((function(z){if(z.hasOwnProperty("legs") && z.legs !== undefined && typeof z.legs === "number"){return true;}else{return false;}})(myDog), "<code>myDog</code> should contain the property <code>legs</code> and it should be a <code>number</code>.");'
+    testString: assert((function(z){if(z.hasOwnProperty("legs") && z.legs !== undefined && typeof z.legs === "number"){return true;}else{return false;}})(myDog), '<code>myDog</code> should contain the property <code>legs</code> and it should be a <code>number</code>.');
   - text: <code>myDog</code> should contain the property <code>tails</code> and it should be a <code>number</code>.
-    testString: 'assert((function(z){if(z.hasOwnProperty("tails") && z.tails !== undefined && typeof z.tails === "number"){return true;}else{return false;}})(myDog), "<code>myDog</code> should contain the property <code>tails</code> and it should be a <code>number</code>.");'
+    testString: assert((function(z){if(z.hasOwnProperty("tails") && z.tails !== undefined && typeof z.tails === "number"){return true;}else{return false;}})(myDog), '<code>myDog</code> should contain the property <code>tails</code> and it should be a <code>number</code>.');
   - text: <code>myDog</code> should contain the property <code>friends</code> and it should be an <code>array</code>.
-    testString: 'assert((function(z){if(z.hasOwnProperty("friends") && z.friends !== undefined && Array.isArray(z.friends)){return true;}else{return false;}})(myDog), "<code>myDog</code> should contain the property <code>friends</code> and it should be an <code>array</code>.");'
+    testString: assert((function(z){if(z.hasOwnProperty("friends") && z.friends !== undefined && Array.isArray(z.friends)){return true;}else{return false;}})(myDog), '<code>myDog</code> should contain the property <code>friends</code> and it should be an <code>array</code>.');
   - text: <code>myDog</code> should only contain all the given properties.
-    testString: 'assert((function(z){return Object.keys(z).length === 4;})(myDog), "<code>myDog</code> should only contain all the given properties.");'
+    testString: assert((function(z){return Object.keys(z).length === 4;})(myDog), '<code>myDog</code> should only contain all the given properties.');
 
 ```
 
@@ -73,7 +73,7 @@ var myDog = {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return z;})(myDog);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/chaining-if-else-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/chaining-if-else-statements.english.md
index 2c114128f6..dd87dd5021 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/chaining-if-else-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/chaining-if-else-statements.english.md
@@ -22,31 +22,31 @@ Write chained <code>if</code>/<code>else if</code> statements to fulfill the fol
 ```yml
 tests:
   - text: You should have at least four <code>else</code> statements
-    testString: 'assert(code.match(/else/g).length > 3, "You should have at least four <code>else</code> statements");'
+    testString: assert(code.match(/else/g).length > 3, 'You should have at least four <code>else</code> statements');
   - text: You should have at least four <code>if</code> statements
-    testString: 'assert(code.match(/if/g).length > 3, "You should have at least four <code>if</code> statements");'
+    testString: assert(code.match(/if/g).length > 3, 'You should have at least four <code>if</code> statements');
   - text: You should have at least one <code>return</code> statement
-    testString: 'assert(code.match(/return/g).length >= 1, "You should have at least one <code>return</code> statement");'
+    testString: assert(code.match(/return/g).length >= 1, 'You should have at least one <code>return</code> statement');
   - text: <code>testSize(0)</code> should return "Tiny"
-    testString: 'assert(testSize(0) === "Tiny", "<code>testSize(0)</code> should return "Tiny"");'
+    testString: assert(testSize(0) === "Tiny", '<code>testSize(0)</code> should return "Tiny"');
   - text: <code>testSize(4)</code> should return "Tiny"
-    testString: 'assert(testSize(4) === "Tiny", "<code>testSize(4)</code> should return "Tiny"");'
+    testString: assert(testSize(4) === "Tiny", '<code>testSize(4)</code> should return "Tiny"');
   - text: <code>testSize(5)</code> should return "Small"
-    testString: 'assert(testSize(5) === "Small", "<code>testSize(5)</code> should return "Small"");'
+    testString: assert(testSize(5) === "Small", '<code>testSize(5)</code> should return "Small"');
   - text: <code>testSize(8)</code> should return "Small"
-    testString: 'assert(testSize(8) === "Small", "<code>testSize(8)</code> should return "Small"");'
+    testString: assert(testSize(8) === "Small", '<code>testSize(8)</code> should return "Small"');
   - text: <code>testSize(10)</code> should return "Medium"
-    testString: 'assert(testSize(10) === "Medium", "<code>testSize(10)</code> should return "Medium"");'
+    testString: assert(testSize(10) === "Medium", '<code>testSize(10)</code> should return "Medium"');
   - text: <code>testSize(14)</code> should return "Medium"
-    testString: 'assert(testSize(14) === "Medium", "<code>testSize(14)</code> should return "Medium"");'
+    testString: assert(testSize(14) === "Medium", '<code>testSize(14)</code> should return "Medium"');
   - text: <code>testSize(15)</code> should return "Large"
-    testString: 'assert(testSize(15) === "Large", "<code>testSize(15)</code> should return "Large"");'
+    testString: assert(testSize(15) === "Large", '<code>testSize(15)</code> should return "Large"');
   - text: <code>testSize(17)</code> should return "Large"
-    testString: 'assert(testSize(17) === "Large", "<code>testSize(17)</code> should return "Large"");'
+    testString: assert(testSize(17) === "Large", '<code>testSize(17)</code> should return "Large"');
   - text: <code>testSize(20)</code> should return "Huge"
-    testString: 'assert(testSize(20) === "Huge", "<code>testSize(20)</code> should return "Huge"");'
+    testString: assert(testSize(20) === "Huge", '<code>testSize(20)</code> should return "Huge"');
   - text: <code>testSize(25)</code> should return "Huge"
-    testString: 'assert(testSize(25) === "Huge", "<code>testSize(25)</code> should return "Huge"");'
+    testString: assert(testSize(25) === "Huge", '<code>testSize(25)</code> should return "Huge"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comment-your-javascript-code.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comment-your-javascript-code.english.md
index ed9a3c401e..b65a79dec3 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comment-your-javascript-code.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comment-your-javascript-code.english.md
@@ -26,9 +26,9 @@ Try creating one of each type of comment.
 ```yml
 tests:
   - text: Create a <code>//</code> style comment that contains at least five letters.
-    testString: 'assert(code.match(/(\/\/)...../g), "Create a <code>//</code> style comment that contains at least five letters.");'
+    testString: assert(code.match(/(\/\/)...../g), 'Create a <code>//</code> style comment that contains at least five letters.');
   - text: Create a <code>/* */</code> style comment that contains at least five letters.
-    testString: 'assert(code.match(/(\/\*)([^\/]{5,})(?=\*\/)/gm), "Create a <code>/* */</code> style comment that contains at least five letters.");'
+    testString: assert(code.match(/(\/\*)([^\/]{5,})(?=\*\/)/gm), 'Create a <code>/* */</code> style comment that contains at least five letters.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-equality-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-equality-operator.english.md
index b1cd210649..66c827d81e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-equality-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-equality-operator.english.md
@@ -25,13 +25,13 @@ Add the <code>equality operator</code> to the indicated line so that the functio
 ```yml
 tests:
   - text: <code>testEqual(10)</code> should return "Not Equal"
-    testString: 'assert(testEqual(10) === "Not Equal", "<code>testEqual(10)</code> should return "Not Equal"");'
+    testString: assert(testEqual(10) === "Not Equal", '<code>testEqual(10)</code> should return "Not Equal"');
   - text: <code>testEqual(12)</code> should return "Equal"
-    testString: 'assert(testEqual(12) === "Equal", "<code>testEqual(12)</code> should return "Equal"");'
+    testString: assert(testEqual(12) === "Equal", '<code>testEqual(12)</code> should return "Equal"');
   - text: <code>testEqual("12")</code> should return "Equal"
-    testString: 'assert(testEqual("12") === "Equal", "<code>testEqual("12")</code> should return "Equal"");'
+    testString: assert(testEqual("12") === "Equal", '<code>testEqual("12")</code> should return "Equal"');
   - text: You should use the <code>==</code> operator
-    testString: 'assert(code.match(/==/g) && !code.match(/===/g), "You should use the <code>==</code> operator");'
+    testString: assert(code.match(/==/g) && !code.match(/===/g), 'You should use the <code>==</code> operator');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-operator.english.md
index 5e87f6edd3..1c42dcf757 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-operator.english.md
@@ -23,21 +23,21 @@ Add the <code>greater than</code> operator to the indicated lines so that the re
 ```yml
 tests:
   - text: <code>testGreaterThan(0)</code> should return "10 or Under"
-    testString: 'assert(testGreaterThan(0) === "10 or Under", "<code>testGreaterThan(0)</code> should return "10 or Under"");'
+    testString: assert(testGreaterThan(0) === "10 or Under", '<code>testGreaterThan(0)</code> should return "10 or Under"');
   - text: <code>testGreaterThan(10)</code> should return "10 or Under"
-    testString: 'assert(testGreaterThan(10) === "10 or Under", "<code>testGreaterThan(10)</code> should return "10 or Under"");'
+    testString: assert(testGreaterThan(10) === "10 or Under", '<code>testGreaterThan(10)</code> should return "10 or Under"');
   - text: <code>testGreaterThan(11)</code> should return "Over 10"
-    testString: 'assert(testGreaterThan(11) === "Over 10", "<code>testGreaterThan(11)</code> should return "Over 10"");'
+    testString: assert(testGreaterThan(11) === "Over 10", '<code>testGreaterThan(11)</code> should return "Over 10"');
   - text: <code>testGreaterThan(99)</code> should return "Over 10"
-    testString: 'assert(testGreaterThan(99) === "Over 10", "<code>testGreaterThan(99)</code> should return "Over 10"");'
+    testString: assert(testGreaterThan(99) === "Over 10", '<code>testGreaterThan(99)</code> should return "Over 10"');
   - text: <code>testGreaterThan(100)</code> should return "Over 10"
-    testString: 'assert(testGreaterThan(100) === "Over 10", "<code>testGreaterThan(100)</code> should return "Over 10"");'
+    testString: assert(testGreaterThan(100) === "Over 10", '<code>testGreaterThan(100)</code> should return "Over 10"');
   - text: <code>testGreaterThan(101)</code> should return "Over 100"
-    testString: 'assert(testGreaterThan(101) === "Over 100", "<code>testGreaterThan(101)</code> should return "Over 100"");'
+    testString: assert(testGreaterThan(101) === "Over 100", '<code>testGreaterThan(101)</code> should return "Over 100"');
   - text: <code>testGreaterThan(150)</code> should return "Over 100"
-    testString: 'assert(testGreaterThan(150) === "Over 100", "<code>testGreaterThan(150)</code> should return "Over 100"");'
+    testString: assert(testGreaterThan(150) === "Over 100", '<code>testGreaterThan(150)</code> should return "Over 100"');
   - text: You should use the <code>&gt;</code> operator at least twice
-    testString: 'assert(code.match(/val\s*>\s*("|")*\d+("|")*/g).length > 1, "You should use the <code>&gt;</code> operator at least twice");'
+    testString: assert(code.match(/val\s*>\s*('|")*\d+('|")*/g).length > 1, 'You should use the <code>&gt;</code> operator at least twice');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-or-equal-to-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-or-equal-to-operator.english.md
index e6d14d622e..a47ae12036 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-or-equal-to-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-greater-than-or-equal-to-operator.english.md
@@ -23,21 +23,21 @@ Add the <code>greater than or equal to</code> operator to the indicated lines so
 ```yml
 tests:
   - text: <code>testGreaterOrEqual(0)</code> should return "Less than 10"
-    testString: 'assert(testGreaterOrEqual(0) === "Less than 10", "<code>testGreaterOrEqual(0)</code> should return "Less than 10"");'
+    testString: assert(testGreaterOrEqual(0) === "Less than 10", '<code>testGreaterOrEqual(0)</code> should return "Less than 10"');
   - text: <code>testGreaterOrEqual(9)</code> should return "Less than 10"
-    testString: 'assert(testGreaterOrEqual(9) === "Less than 10", "<code>testGreaterOrEqual(9)</code> should return "Less than 10"");'
+    testString: assert(testGreaterOrEqual(9) === "Less than 10", '<code>testGreaterOrEqual(9)</code> should return "Less than 10"');
   - text: <code>testGreaterOrEqual(10)</code> should return "10 or Over"
-    testString: 'assert(testGreaterOrEqual(10) === "10 or Over", "<code>testGreaterOrEqual(10)</code> should return "10 or Over"");'
+    testString: assert(testGreaterOrEqual(10) === "10 or Over", '<code>testGreaterOrEqual(10)</code> should return "10 or Over"');
   - text: <code>testGreaterOrEqual(11)</code> should return "10 or Over"
-    testString: 'assert(testGreaterOrEqual(11) === "10 or Over", "<code>testGreaterOrEqual(11)</code> should return "10 or Over"");'
+    testString: assert(testGreaterOrEqual(11) === "10 or Over", '<code>testGreaterOrEqual(11)</code> should return "10 or Over"');
   - text: <code>testGreaterOrEqual(19)</code> should return "10 or Over"
-    testString: 'assert(testGreaterOrEqual(19) === "10 or Over", "<code>testGreaterOrEqual(19)</code> should return "10 or Over"");'
+    testString: assert(testGreaterOrEqual(19) === "10 or Over", '<code>testGreaterOrEqual(19)</code> should return "10 or Over"');
   - text: <code>testGreaterOrEqual(100)</code> should return "20 or Over"
-    testString: 'assert(testGreaterOrEqual(100) === "20 or Over", "<code>testGreaterOrEqual(100)</code> should return "20 or Over"");'
+    testString: assert(testGreaterOrEqual(100) === "20 or Over", '<code>testGreaterOrEqual(100)</code> should return "20 or Over"');
   - text: <code>testGreaterOrEqual(21)</code> should return "20 or Over"
-    testString: 'assert(testGreaterOrEqual(21) === "20 or Over", "<code>testGreaterOrEqual(21)</code> should return "20 or Over"");'
+    testString: assert(testGreaterOrEqual(21) === "20 or Over", '<code>testGreaterOrEqual(21)</code> should return "20 or Over"');
   - text: You should use the <code>&gt;=</code> operator at least twice
-    testString: 'assert(code.match(/val\s*>=\s*("|")*\d+("|")*/g).length > 1, "You should use the <code>&gt;=</code> operator at least twice");'
+    testString: assert(code.match(/val\s*>=\s*('|")*\d+('|")*/g).length > 1, 'You should use the <code>&gt;=</code> operator at least twice');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-inequality-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-inequality-operator.english.md
index 22f3aa6676..72f1ade384 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-inequality-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-inequality-operator.english.md
@@ -22,17 +22,17 @@ Add the inequality operator <code>!=</code> in the <code>if</code> statement so
 ```yml
 tests:
   - text: <code>testNotEqual(99)</code> should return "Equal"
-    testString: 'assert(testNotEqual(99) === "Equal", "<code>testNotEqual(99)</code> should return "Equal"");'
+    testString: assert(testNotEqual(99) === "Equal", '<code>testNotEqual(99)</code> should return "Equal"');
   - text: <code>testNotEqual("99")</code> should return "Equal"
-    testString: 'assert(testNotEqual("99") === "Equal", "<code>testNotEqual("99")</code> should return "Equal"");'
+    testString: assert(testNotEqual("99") === "Equal", '<code>testNotEqual("99")</code> should return "Equal"');
   - text: <code>testNotEqual(12)</code> should return "Not Equal"
-    testString: 'assert(testNotEqual(12) === "Not Equal", "<code>testNotEqual(12)</code> should return "Not Equal"");'
+    testString: assert(testNotEqual(12) === "Not Equal", '<code>testNotEqual(12)</code> should return "Not Equal"');
   - text: <code>testNotEqual("12")</code> should return "Not Equal"
-    testString: 'assert(testNotEqual("12") === "Not Equal", "<code>testNotEqual("12")</code> should return "Not Equal"");'
+    testString: assert(testNotEqual("12") === "Not Equal", '<code>testNotEqual("12")</code> should return "Not Equal"');
   - text: <code>testNotEqual("bob")</code> should return "Not Equal"
-    testString: 'assert(testNotEqual("bob") === "Not Equal", "<code>testNotEqual("bob")</code> should return "Not Equal"");'
+    testString: assert(testNotEqual("bob") === "Not Equal", '<code>testNotEqual("bob")</code> should return "Not Equal"');
   - text: You should use the <code>!=</code> operator
-    testString: 'assert(code.match(/(?!!==)!=/), "You should use the <code>!=</code> operator");'
+    testString: assert(code.match(/(?!!==)!=/), 'You should use the <code>!=</code> operator');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-operator.english.md
index c9c64e21cd..aff73b419b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-operator.english.md
@@ -22,19 +22,19 @@ Add the <code>less than</code> operator to the indicated lines so that the retur
 ```yml
 tests:
   - text: <code>testLessThan(0)</code> should return "Under 25"
-    testString: 'assert(testLessThan(0) === "Under 25", "<code>testLessThan(0)</code> should return "Under 25"");'
+    testString: assert(testLessThan(0) === "Under 25", '<code>testLessThan(0)</code> should return "Under 25"');
   - text: <code>testLessThan(24)</code> should return "Under 25"
-    testString: 'assert(testLessThan(24) === "Under 25", "<code>testLessThan(24)</code> should return "Under 25"");'
+    testString: assert(testLessThan(24) === "Under 25", '<code>testLessThan(24)</code> should return "Under 25"');
   - text: <code>testLessThan(25)</code> should return "Under 55"
-    testString: 'assert(testLessThan(25) === "Under 55", "<code>testLessThan(25)</code> should return "Under 55"");'
+    testString: assert(testLessThan(25) === "Under 55", '<code>testLessThan(25)</code> should return "Under 55"');
   - text: <code>testLessThan(54)</code> should return "Under 55"
-    testString: 'assert(testLessThan(54) === "Under 55", "<code>testLessThan(54)</code> should return "Under 55"");'
+    testString: assert(testLessThan(54) === "Under 55", '<code>testLessThan(54)</code> should return "Under 55"');
   - text: <code>testLessThan(55)</code> should return "55 or Over"
-    testString: 'assert(testLessThan(55) === "55 or Over", "<code>testLessThan(55)</code> should return "55 or Over"");'
+    testString: assert(testLessThan(55) === "55 or Over", '<code>testLessThan(55)</code> should return "55 or Over"');
   - text: <code>testLessThan(99)</code> should return "55 or Over"
-    testString: 'assert(testLessThan(99) === "55 or Over", "<code>testLessThan(99)</code> should return "55 or Over"");'
+    testString: assert(testLessThan(99) === "55 or Over", '<code>testLessThan(99)</code> should return "55 or Over"');
   - text: You should use the <code>&lt;</code> operator at least twice
-    testString: 'assert(code.match(/val\s*<\s*("|")*\d+("|")*/g).length > 1, "You should use the <code>&lt;</code> operator at least twice");'
+    testString: assert(code.match(/val\s*<\s*('|")*\d+('|")*/g).length > 1, 'You should use the <code>&lt;</code> operator at least twice');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-or-equal-to-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-or-equal-to-operator.english.md
index c5bb83e708..2af712402d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-or-equal-to-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-less-than-or-equal-to-operator.english.md
@@ -22,21 +22,21 @@ Add the <code>less than or equal to</code> operator to the indicated lines so th
 ```yml
 tests:
   - text: <code>testLessOrEqual(0)</code> should return "Smaller Than or Equal to 12"
-    testString: 'assert(testLessOrEqual(0) === "Smaller Than or Equal to 12", "<code>testLessOrEqual(0)</code> should return "Smaller Than or Equal to 12"");'
+    testString: assert(testLessOrEqual(0) === "Smaller Than or Equal to 12", '<code>testLessOrEqual(0)</code> should return "Smaller Than or Equal to 12"');
   - text: <code>testLessOrEqual(11)</code> should return "Smaller Than or Equal to 12"
-    testString: 'assert(testLessOrEqual(11) === "Smaller Than or Equal to 12", "<code>testLessOrEqual(11)</code> should return "Smaller Than or Equal to 12"");'
+    testString: assert(testLessOrEqual(11) === "Smaller Than or Equal to 12", '<code>testLessOrEqual(11)</code> should return "Smaller Than or Equal to 12"');
   - text: <code>testLessOrEqual(12)</code> should return "Smaller Than or Equal to 12"
-    testString: 'assert(testLessOrEqual(12) === "Smaller Than or Equal to 12", "<code>testLessOrEqual(12)</code> should return "Smaller Than or Equal to 12"");'
+    testString: assert(testLessOrEqual(12) === "Smaller Than or Equal to 12", '<code>testLessOrEqual(12)</code> should return "Smaller Than or Equal to 12"');
   - text: <code>testLessOrEqual(23)</code> should return "Smaller Than or Equal to 24"
-    testString: 'assert(testLessOrEqual(23) === "Smaller Than or Equal to 24", "<code>testLessOrEqual(23)</code> should return "Smaller Than or Equal to 24"");'
+    testString: assert(testLessOrEqual(23) === "Smaller Than or Equal to 24", '<code>testLessOrEqual(23)</code> should return "Smaller Than or Equal to 24"');
   - text: <code>testLessOrEqual(24)</code> should return "Smaller Than or Equal to 24"
-    testString: 'assert(testLessOrEqual(24) === "Smaller Than or Equal to 24", "<code>testLessOrEqual(24)</code> should return "Smaller Than or Equal to 24"");'
+    testString: assert(testLessOrEqual(24) === "Smaller Than or Equal to 24", '<code>testLessOrEqual(24)</code> should return "Smaller Than or Equal to 24"');
   - text: <code>testLessOrEqual(25)</code> should return "More Than 24"
-    testString: 'assert(testLessOrEqual(25) === "More Than 24", "<code>testLessOrEqual(25)</code> should return "More Than 24"");'
+    testString: assert(testLessOrEqual(25) === "More Than 24", '<code>testLessOrEqual(25)</code> should return "More Than 24"');
   - text: <code>testLessOrEqual(55)</code> should return "More Than 24"
-    testString: 'assert(testLessOrEqual(55) === "More Than 24", "<code>testLessOrEqual(55)</code> should return "More Than 24"");'
+    testString: assert(testLessOrEqual(55) === "More Than 24", '<code>testLessOrEqual(55)</code> should return "More Than 24"');
   - text: You should use the <code>&lt;=</code> operator at least twice
-    testString: 'assert(code.match(/val\s*<=\s*("|")*\d+("|")*/g).length > 1, "You should use the <code>&lt;=</code> operator at least twice");'
+    testString: assert(code.match(/val\s*<=\s*('|")*\d+('|")*/g).length > 1, 'You should use the <code>&lt;=</code> operator at least twice');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-equality-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-equality-operator.english.md
index 6d1a83546b..b29ed260fa 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-equality-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-equality-operator.english.md
@@ -24,13 +24,13 @@ Use the strict equality operator in the <code>if</code> statement so the functio
 ```yml
 tests:
   - text: <code>testStrict(10)</code> should return "Not Equal"
-    testString: 'assert(testStrict(10) === "Not Equal", "<code>testStrict(10)</code> should return "Not Equal"");'
+    testString: assert(testStrict(10) === "Not Equal", '<code>testStrict(10)</code> should return "Not Equal"');
   - text: <code>testStrict(7)</code> should return "Equal"
-    testString: 'assert(testStrict(7) === "Equal", "<code>testStrict(7)</code> should return "Equal"");'
+    testString: assert(testStrict(7) === "Equal", '<code>testStrict(7)</code> should return "Equal"');
   - text: <code>testStrict("7")</code> should return "Not Equal"
-    testString: 'assert(testStrict("7") === "Not Equal", "<code>testStrict("7")</code> should return "Not Equal"");'
+    testString: assert(testStrict("7") === "Not Equal", '<code>testStrict("7")</code> should return "Not Equal"');
   - text: You should use the <code>===</code> operator
-    testString: 'assert(code.match(/(val\s*===\s*\d+)|(\d+\s*===\s*val)/g).length > 0, "You should use the <code>===</code> operator");'
+    testString: assert(code.match(/(val\s*===\s*\d+)|(\d+\s*===\s*val)/g).length > 0, 'You should use the <code>===</code> operator');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-inequality-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-inequality-operator.english.md
index f9ee7508fe..4e957da974 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-inequality-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparison-with-the-strict-inequality-operator.english.md
@@ -22,15 +22,15 @@ Add the <code>strict inequality operator</code> to the <code>if</code> statement
 ```yml
 tests:
   - text: <code>testStrictNotEqual(17)</code> should return "Equal"
-    testString: 'assert(testStrictNotEqual(17) === "Equal", "<code>testStrictNotEqual(17)</code> should return "Equal"");'
+    testString: assert(testStrictNotEqual(17) === "Equal", '<code>testStrictNotEqual(17)</code> should return "Equal"');
   - text: <code>testStrictNotEqual("17")</code> should return "Not Equal"
-    testString: 'assert(testStrictNotEqual("17") === "Not Equal", "<code>testStrictNotEqual("17")</code> should return "Not Equal"");'
+    testString: assert(testStrictNotEqual("17") === "Not Equal", '<code>testStrictNotEqual("17")</code> should return "Not Equal"');
   - text: <code>testStrictNotEqual(12)</code> should return "Not Equal"
-    testString: 'assert(testStrictNotEqual(12) === "Not Equal", "<code>testStrictNotEqual(12)</code> should return "Not Equal"");'
+    testString: assert(testStrictNotEqual(12) === "Not Equal", '<code>testStrictNotEqual(12)</code> should return "Not Equal"');
   - text: <code>testStrictNotEqual("bob")</code> should return "Not Equal"
-    testString: 'assert(testStrictNotEqual("bob") === "Not Equal", "<code>testStrictNotEqual("bob")</code> should return "Not Equal"");'
+    testString: assert(testStrictNotEqual("bob") === "Not Equal", '<code>testStrictNotEqual("bob")</code> should return "Not Equal"');
   - text: You should use the <code>!==</code> operator
-    testString: 'assert(code.match(/(val\s*!==\s*\d+)|(\d+\s*!==\s*val)/g).length > 0, "You should use the <code>!==</code> operator");'
+    testString: assert(code.match(/(val\s*!==\s*\d+)|(\d+\s*!==\s*val)/g).length > 0, 'You should use the <code>!==</code> operator');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-and-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-and-operator.english.md
index a0168837b9..58e7434f0a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-and-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-and-operator.english.md
@@ -24,25 +24,25 @@ Combine the two if statements into one statement which will return <code>"Yes"</
 ```yml
 tests:
   - text: You should use the <code>&&</code> operator once
-    testString: 'assert(code.match(/&&/g).length === 1, "You should use the <code>&&</code> operator once");'
+    testString: assert(code.match(/&&/g).length === 1, 'You should use the <code>&&</code> operator once');
   - text: You should only have one <code>if</code> statement
-    testString: 'assert(code.match(/if/g).length === 1, "You should only have one <code>if</code> statement");'
+    testString: assert(code.match(/if/g).length === 1, 'You should only have one <code>if</code> statement');
   - text: <code>testLogicalAnd(0)</code> should return "No"
-    testString: 'assert(testLogicalAnd(0) === "No", "<code>testLogicalAnd(0)</code> should return "No"");'
+    testString: assert(testLogicalAnd(0) === "No", '<code>testLogicalAnd(0)</code> should return "No"');
   - text: <code>testLogicalAnd(24)</code> should return "No"
-    testString: 'assert(testLogicalAnd(24) === "No", "<code>testLogicalAnd(24)</code> should return "No"");'
+    testString: assert(testLogicalAnd(24) === "No", '<code>testLogicalAnd(24)</code> should return "No"');
   - text: <code>testLogicalAnd(25)</code> should return "Yes"
-    testString: 'assert(testLogicalAnd(25) === "Yes", "<code>testLogicalAnd(25)</code> should return "Yes"");'
+    testString: assert(testLogicalAnd(25) === "Yes", '<code>testLogicalAnd(25)</code> should return "Yes"');
   - text: <code>testLogicalAnd(30)</code> should return "Yes"
-    testString: 'assert(testLogicalAnd(30) === "Yes", "<code>testLogicalAnd(30)</code> should return "Yes"");'
+    testString: assert(testLogicalAnd(30) === "Yes", '<code>testLogicalAnd(30)</code> should return "Yes"');
   - text: <code>testLogicalAnd(50)</code> should return "Yes"
-    testString: 'assert(testLogicalAnd(50) === "Yes", "<code>testLogicalAnd(50)</code> should return "Yes"");'
+    testString: assert(testLogicalAnd(50) === "Yes", '<code>testLogicalAnd(50)</code> should return "Yes"');
   - text: <code>testLogicalAnd(51)</code> should return "No"
-    testString: 'assert(testLogicalAnd(51) === "No", "<code>testLogicalAnd(51)</code> should return "No"");'
+    testString: assert(testLogicalAnd(51) === "No", '<code>testLogicalAnd(51)</code> should return "No"');
   - text: <code>testLogicalAnd(75)</code> should return "No"
-    testString: 'assert(testLogicalAnd(75) === "No", "<code>testLogicalAnd(75)</code> should return "No"");'
+    testString: assert(testLogicalAnd(75) === "No", '<code>testLogicalAnd(75)</code> should return "No"');
   - text: <code>testLogicalAnd(80)</code> should return "No"
-    testString: 'assert(testLogicalAnd(80) === "No", "<code>testLogicalAnd(80)</code> should return "No"");'
+    testString: assert(testLogicalAnd(80) === "No", '<code>testLogicalAnd(80)</code> should return "No"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-or-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-or-operator.english.md
index 1fd77fd379..a9d0011279 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-or-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-or-operator.english.md
@@ -25,25 +25,25 @@ Combine the two <code>if</code> statements into one statement which returns <cod
 ```yml
 tests:
   - text: You should use the <code>||</code> operator once
-    testString: 'assert(code.match(/\|\|/g).length === 1, "You should use the <code>||</code> operator once");'
+    testString: assert(code.match(/\|\|/g).length === 1, 'You should use the <code>||</code> operator once');
   - text: You should only have one <code>if</code> statement
-    testString: 'assert(code.match(/if/g).length === 1, "You should only have one <code>if</code> statement");'
+    testString: assert(code.match(/if/g).length === 1, 'You should only have one <code>if</code> statement');
   - text: <code>testLogicalOr(0)</code> should return "Outside"
-    testString: 'assert(testLogicalOr(0) === "Outside", "<code>testLogicalOr(0)</code> should return "Outside"");'
+    testString: assert(testLogicalOr(0) === "Outside", '<code>testLogicalOr(0)</code> should return "Outside"');
   - text: <code>testLogicalOr(9)</code> should return "Outside"
-    testString: 'assert(testLogicalOr(9) === "Outside", "<code>testLogicalOr(9)</code> should return "Outside"");'
+    testString: assert(testLogicalOr(9) === "Outside", '<code>testLogicalOr(9)</code> should return "Outside"');
   - text: <code>testLogicalOr(10)</code> should return "Inside"
-    testString: 'assert(testLogicalOr(10) === "Inside", "<code>testLogicalOr(10)</code> should return "Inside"");'
+    testString: assert(testLogicalOr(10) === "Inside", '<code>testLogicalOr(10)</code> should return "Inside"');
   - text: <code>testLogicalOr(15)</code> should return "Inside"
-    testString: 'assert(testLogicalOr(15) === "Inside", "<code>testLogicalOr(15)</code> should return "Inside"");'
+    testString: assert(testLogicalOr(15) === "Inside", '<code>testLogicalOr(15)</code> should return "Inside"');
   - text: <code>testLogicalOr(19)</code> should return "Inside"
-    testString: 'assert(testLogicalOr(19) === "Inside", "<code>testLogicalOr(19)</code> should return "Inside"");'
+    testString: assert(testLogicalOr(19) === "Inside", '<code>testLogicalOr(19)</code> should return "Inside"');
   - text: <code>testLogicalOr(20)</code> should return "Inside"
-    testString: 'assert(testLogicalOr(20) === "Inside", "<code>testLogicalOr(20)</code> should return "Inside"");'
+    testString: assert(testLogicalOr(20) === "Inside", '<code>testLogicalOr(20)</code> should return "Inside"');
   - text: <code>testLogicalOr(21)</code> should return "Outside"
-    testString: 'assert(testLogicalOr(21) === "Outside", "<code>testLogicalOr(21)</code> should return "Outside"");'
+    testString: assert(testLogicalOr(21) === "Outside", '<code>testLogicalOr(21)</code> should return "Outside"');
   - text: <code>testLogicalOr(25)</code> should return "Outside"
-    testString: 'assert(testLogicalOr(25) === "Outside", "<code>testLogicalOr(25)</code> should return "Outside"");'
+    testString: assert(testLogicalOr(25) === "Outside", '<code>testLogicalOr(25)</code> should return "Outside"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-addition.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-addition.english.md
index c6b43dae5d..79f547c9d9 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-addition.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-addition.english.md
@@ -24,15 +24,15 @@ Convert the assignments for <code>a</code>, <code>b</code>, and <code>c</code> t
 ```yml
 tests:
   - text: <code>a</code> should equal <code>15</code>
-    testString: 'assert(a === 15, "<code>a</code> should equal <code>15</code>");'
+    testString: assert(a === 15, '<code>a</code> should equal <code>15</code>');
   - text: <code>b</code> should equal <code>26</code>
-    testString: 'assert(b === 26, "<code>b</code> should equal <code>26</code>");'
+    testString: assert(b === 26, '<code>b</code> should equal <code>26</code>');
   - text: <code>c</code> should equal <code>19</code>
-    testString: 'assert(c === 19, "<code>c</code> should equal <code>19</code>");'
+    testString: assert(c === 19, '<code>c</code> should equal <code>19</code>');
   - text: You should use the <code>+=</code> operator for each variable
-    testString: 'assert(code.match(/\+=/g).length === 3, "You should use the <code>+=</code> operator for each variable");'
+    testString: assert(code.match(/\+=/g).length === 3, 'You should use the <code>+=</code> operator for each variable');
   - text: Do not modify the code above the line
-    testString: 'assert(/var a = 3;/.test(code) && /var b = 17;/.test(code) && /var c = 12;/.test(code), "Do not modify the code above the line");'
+    testString: assert(/var a = 3;/.test(code) && /var b = 17;/.test(code) && /var c = 12;/.test(code), 'Do not modify the code above the line');
 
 ```
 
@@ -63,7 +63,7 @@ c = c + 7;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-division.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-division.english.md
index d679e7eec3..531e924203 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-division.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-division.english.md
@@ -23,15 +23,15 @@ Convert the assignments for <code>a</code>, <code>b</code>, and <code>c</code> t
 ```yml
 tests:
   - text: <code>a</code> should equal <code>4</code>
-    testString: 'assert(a === 4, "<code>a</code> should equal <code>4</code>");'
+    testString: assert(a === 4, '<code>a</code> should equal <code>4</code>');
   - text: <code>b</code> should equal <code>27</code>
-    testString: 'assert(b === 27, "<code>b</code> should equal <code>27</code>");'
+    testString: assert(b === 27, '<code>b</code> should equal <code>27</code>');
   - text: <code>c</code> should equal <code>3</code>
-    testString: 'assert(c === 3, "<code>c</code> should equal <code>3</code>");'
+    testString: assert(c === 3, '<code>c</code> should equal <code>3</code>');
   - text: You should use the <code>/=</code> operator for each variable
-    testString: 'assert(code.match(/\/=/g).length === 3, "You should use the <code>/=</code> operator for each variable");'
+    testString: assert(code.match(/\/=/g).length === 3, 'You should use the <code>/=</code> operator for each variable');
   - text: Do not modify the code above the line
-    testString: 'assert(/var a = 48;/.test(code) && /var b = 108;/.test(code) && /var c = 33;/.test(code), "Do not modify the code above the line");'
+    testString: assert(/var a = 48;/.test(code) && /var b = 108;/.test(code) && /var c = 33;/.test(code), 'Do not modify the code above the line');
 
 ```
 
@@ -62,7 +62,7 @@ c = c / 11;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-multiplication.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-multiplication.english.md
index 1e8ed37fc0..823c83c3ae 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-multiplication.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-multiplication.english.md
@@ -23,15 +23,15 @@ Convert the assignments for <code>a</code>, <code>b</code>, and <code>c</code> t
 ```yml
 tests:
   - text: <code>a</code> should equal <code>25</code>
-    testString: 'assert(a === 25, "<code>a</code> should equal <code>25</code>");'
+    testString: assert(a === 25, '<code>a</code> should equal <code>25</code>');
   - text: <code>b</code> should equal <code>36</code>
-    testString: 'assert(b === 36, "<code>b</code> should equal <code>36</code>");'
+    testString: assert(b === 36, '<code>b</code> should equal <code>36</code>');
   - text: <code>c</code> should equal <code>46</code>
-    testString: 'assert(c === 46, "<code>c</code> should equal <code>46</code>");'
+    testString: assert(c === 46, '<code>c</code> should equal <code>46</code>');
   - text: You should use the <code>*=</code> operator for each variable
-    testString: 'assert(code.match(/\*=/g).length === 3, "You should use the <code>*=</code> operator for each variable");'
+    testString: assert(code.match(/\*=/g).length === 3, 'You should use the <code>*=</code> operator for each variable');
   - text: Do not modify the code above the line
-    testString: 'assert(/var a = 5;/.test(code) && /var b = 12;/.test(code) && /var c = 4\.6;/.test(code), "Do not modify the code above the line");'
+    testString: assert(/var a = 5;/.test(code) && /var b = 12;/.test(code) && /var c = 4\.6;/.test(code), 'Do not modify the code above the line');
 
 ```
 
@@ -63,7 +63,7 @@ c = c * 10;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-subtraction.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-subtraction.english.md
index 8743ffaa1b..85c470f40b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-subtraction.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-subtraction.english.md
@@ -23,15 +23,15 @@ Convert the assignments for <code>a</code>, <code>b</code>, and <code>c</code> t
 ```yml
 tests:
   - text: <code>a</code> should equal <code>5</code>
-    testString: 'assert(a === 5, "<code>a</code> should equal <code>5</code>");'
+    testString: assert(a === 5, '<code>a</code> should equal <code>5</code>');
   - text: <code>b</code> should equal <code>-6</code>
-    testString: 'assert(b === -6, "<code>b</code> should equal <code>-6</code>");'
+    testString: assert(b === -6, '<code>b</code> should equal <code>-6</code>');
   - text: <code>c</code> should equal <code>2</code>
-    testString: 'assert(c === 2, "<code>c</code> should equal <code>2</code>");'
+    testString: assert(c === 2, '<code>c</code> should equal <code>2</code>');
   - text: You should use the <code>-=</code> operator for each variable
-    testString: 'assert(code.match(/-=/g).length === 3, "You should use the <code>-=</code> operator for each variable");'
+    testString: assert(code.match(/-=/g).length === 3, 'You should use the <code>-=</code> operator for each variable');
   - text: Do not modify the code above the line
-    testString: 'assert(/var a = 11;/.test(code) && /var b = 9;/.test(code) && /var c = 3;/.test(code), "Do not modify the code above the line");'
+    testString: assert(/var a = 11;/.test(code) && /var b = 9;/.test(code) && /var c = 3;/.test(code), 'Do not modify the code above the line');
 
 ```
 
@@ -63,7 +63,7 @@ c = c - 1;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-plus-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-plus-operator.english.md
index 1a73c86bfc..08a41d790e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-plus-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-plus-operator.english.md
@@ -23,13 +23,13 @@ Build <code>myStr</code> from the strings <code>"This is the start. "</code> and
 ```yml
 tests:
   - text: <code>myStr</code> should have a value of <code>This is the start. This is the end.</code>
-    testString: 'assert(myStr === "This is the start. This is the end.", "<code>myStr</code> should have a value of <code>This is the start. This is the end.</code>");'
+    testString: assert(myStr === "This is the start. This is the end.", '<code>myStr</code> should have a value of <code>This is the start. This is the end.</code>');
   - text: Use the <code>+</code> operator to build <code>myStr</code>
-    testString: 'assert(code.match(/([""]).*([""])\s*\+\s*([""]).*([""])/g).length > 1, "Use the <code>+</code> operator to build <code>myStr</code>");'
+    testString: assert(code.match(/(["']).*(["'])\s*\+\s*(["']).*(["'])/g).length > 1, 'Use the <code>+</code> operator to build <code>myStr</code>');
   - text: <code>myStr</code> should be created using the <code>var</code> keyword.
-    testString: 'assert(/var\s+myStr/.test(code), "<code>myStr</code> should be created using the <code>var</code> keyword.");'
+    testString: assert(/var\s+myStr/.test(code), '<code>myStr</code> should be created using the <code>var</code> keyword.');
   - text: Make sure to assign the result to the <code>myStr</code> variable.
-    testString: 'assert(/myStr\s*=/.test(code), "Make sure to assign the result to the <code>myStr</code> variable.");'
+    testString: assert(/myStr\s*=/.test(code), 'Make sure to assign the result to the <code>myStr</code> variable.');
 
 ```
 
@@ -58,7 +58,13 @@ var myStr;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){
+  if(typeof myStr === 'string') {
+    return 'myStr = "' + myStr + '"';
+  } else {
+    return 'myStr is not a string';
+  }
+})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator.english.md
index 309eedefb8..82763a5d38 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator.english.md
@@ -21,9 +21,9 @@ Build <code>myStr</code> over several lines by concatenating these two strings:
 ```yml
 tests:
   - text: <code>myStr</code> should have a value of <code>This is the first sentence. This is the second sentence.</code>
-    testString: 'assert(myStr === "This is the first sentence. This is the second sentence.", "<code>myStr</code> should have a value of <code>This is the first sentence. This is the second sentence.</code>");'
+    testString: assert(myStr === "This is the first sentence. This is the second sentence.", '<code>myStr</code> should have a value of <code>This is the first sentence. This is the second sentence.</code>');
   - text: Use the <code>+=</code> operator to build <code>myStr</code>
-    testString: 'assert(code.match(/\w\s*\+=\s*[""]/g).length > 1 && code.match(/\w\s*\=\s*[""]/g).length > 1, "Use the <code>+=</code> operator to build <code>myStr</code>");'
+    testString: assert(code.match(/\w\s*\+=\s*["']/g).length > 1 && code.match(/\w\s*\=\s*["']/g).length > 1, 'Use the <code>+=</code> operator to build <code>myStr</code>');
 
 ```
 
@@ -53,7 +53,13 @@ var myStr;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){
+  if(typeof myStr === 'string') {
+    return 'myStr = "' + myStr + '"';
+  } else {
+    return 'myStr is not a string';
+  }
+})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/constructing-strings-with-variables.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/constructing-strings-with-variables.english.md
index 8c2ab0cb69..2d85b84072 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/constructing-strings-with-variables.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/constructing-strings-with-variables.english.md
@@ -20,9 +20,9 @@ Set <code>myName</code> to a string equal to your name and build <code>myStr</co
 ```yml
 tests:
   - text: <code>myName</code> should be set to a string at least 3 characters long
-    testString: 'assert(typeof myName !== "undefined" && myName.length > 2, "<code>myName</code> should be set to a string at least 3 characters long");'
+    testString: assert(typeof myName !== 'undefined' && myName.length > 2, '<code>myName</code> should be set to a string at least 3 characters long');
   - text: Use two <code>+</code> operators to build <code>myStr</code> with <code>myName</code> inside it
-    testString: 'assert(code.match(/[""]\s*\+\s*myName\s*\+\s*[""]/g).length > 0, "Use two <code>+</code> operators to build <code>myStr</code> with <code>myName</code> inside it");'
+    testString: assert(code.match(/["']\s*\+\s*myName\s*\+\s*["']/g).length > 0, 'Use two <code>+</code> operators to build <code>myStr</code> with <code>myName</code> inside it');
 
 ```
 
@@ -52,7 +52,20 @@ var myStr;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){
+  var output = [];
+  if(typeof myName === 'string') {
+    output.push('myName = "' + myName + '"');
+  } else {
+    output.push('myName is not a string');
+  }
+  if(typeof myStr === 'string') {
+    output.push('myStr = "' + myStr + '"');
+  } else {
+    output.push('myStr is not a string');
+  }
+  return output.join('\n');
+})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/count-backwards-with-a-for-loop.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/count-backwards-with-a-for-loop.english.md
index b71cdc2699..4be822e85d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/count-backwards-with-a-for-loop.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/count-backwards-with-a-for-loop.english.md
@@ -25,11 +25,11 @@ Push the odd numbers from 9 through 1 to <code>myArray</code> using a <code>for<
 ```yml
 tests:
   - text: You should be using a <code>for</code> loop for this.
-    testString: 'assert(code.match(/for\s*\(/g).length > 1, "You should be using a <code>for</code> loop for this.");'
+    testString: assert(code.match(/for\s*\(/g).length > 1, 'You should be using a <code>for</code> loop for this.');
   - text: You should be using the array method <code>push</code>.
-    testString: 'assert(code.match(/myArray.push/), "You should be using the array method <code>push</code>.");'
-  - text: '<code>myArray</code> should equal <code>[9,7,5,3,1]</code>.'
-    testString: 'assert.deepEqual(myArray, [9,7,5,3,1], "<code>myArray</code> should equal <code>[9,7,5,3,1]</code>.");'
+    testString: assert(code.match(/myArray.push/), 'You should be using the array method <code>push</code>.');
+  - text: <code>myArray</code> should equal <code>[9,7,5,3,1]</code>.
+    testString: assert.deepEqual(myArray, [9,7,5,3,1], '<code>myArray</code> should equal <code>[9,7,5,3,1]</code>.');
 
 ```
 
@@ -63,7 +63,7 @@ var myArray = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/counting-cards.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/counting-cards.english.md
index eea99d3125..cd4f60078c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/counting-cards.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/counting-cards.english.md
@@ -24,20 +24,20 @@ You will write a card counting function. It will receive a <code>card</code> par
 
 ```yml
 tests:
-  - text: 'Cards Sequence 2, 3, 4, 5, 6 should return <code>5 Bet</code>'
-    testString: 'assert((function(){ count = 0; cc(2);cc(3);cc(4);cc(5);var out = cc(6); if(out === "5 Bet") {return true;} return false; })(), "Cards Sequence 2, 3, 4, 5, 6 should return <code>5 Bet</code>");'
-  - text: 'Cards Sequence 7, 8, 9 should return <code>0 Hold</code>'
-    testString: 'assert((function(){ count = 0; cc(7);cc(8);var out = cc(9); if(out === "0 Hold") {return true;} return false; })(), "Cards Sequence 7, 8, 9 should return <code>0 Hold</code>");'
-  - text: 'Cards Sequence 10, J, Q, K, A should return <code>-5 Hold</code>'
-    testString: 'assert((function(){ count = 0; cc(10);cc("J");cc("Q");cc("K");var out = cc("A"); if(out === "-5 Hold") {return true;} return false; })(), "Cards Sequence 10, J, Q, K, A should return <code>-5 Hold</code>");'
-  - text: 'Cards Sequence 3, 7, Q, 8, A should return <code>-1 Hold</code>'
-    testString: 'assert((function(){ count = 0; cc(3);cc(7);cc("Q");cc(8);var out = cc("A"); if(out === "-1 Hold") {return true;} return false; })(), "Cards Sequence 3, 7, Q, 8, A should return <code>-1 Hold</code>");'
-  - text: 'Cards Sequence 2, J, 9, 2, 7 should return <code>1 Bet</code>'
-    testString: 'assert((function(){ count = 0; cc(2);cc("J");cc(9);cc(2);var out = cc(7); if(out === "1 Bet") {return true;} return false; })(), "Cards Sequence 2, J, 9, 2, 7 should return <code>1 Bet</code>");'
-  - text: 'Cards Sequence 2, 2, 10 should return <code>1 Bet</code>'
-    testString: 'assert((function(){ count = 0; cc(2);cc(2);var out = cc(10); if(out === "1 Bet") {return true;} return false; })(), "Cards Sequence 2, 2, 10 should return <code>1 Bet</code>");'
-  - text: 'Cards Sequence 3, 2, A, 10, K should return <code>-1 Hold</code>'
-    testString: 'assert((function(){ count = 0; cc(3);cc(2);cc("A");cc(10);var out = cc("K"); if(out === "-1 Hold") {return true;} return false; })(), "Cards Sequence 3, 2, A, 10, K should return <code>-1 Hold</code>");'
+  - text: Cards Sequence 2, 3, 4, 5, 6 should return <code>5 Bet</code>
+    testString: assert((function(){ count = 0; cc(2);cc(3);cc(4);cc(5);var out = cc(6); if(out === "5 Bet") {return true;} return false; })(), 'Cards Sequence 2, 3, 4, 5, 6 should return <code>5 Bet</code>');
+  - text: Cards Sequence 7, 8, 9 should return <code>0 Hold</code>
+    testString: assert((function(){ count = 0; cc(7);cc(8);var out = cc(9); if(out === "0 Hold") {return true;} return false; })(), 'Cards Sequence 7, 8, 9 should return <code>0 Hold</code>');
+  - text: Cards Sequence 10, J, Q, K, A should return <code>-5 Hold</code>
+    testString: assert((function(){ count = 0; cc(10);cc('J');cc('Q');cc('K');var out = cc('A'); if(out === "-5 Hold") {return true;} return false; })(), 'Cards Sequence 10, J, Q, K, A should return <code>-5 Hold</code>');
+  - text: Cards Sequence 3, 7, Q, 8, A should return <code>-1 Hold</code>
+    testString: assert((function(){ count = 0; cc(3);cc(7);cc('Q');cc(8);var out = cc('A'); if(out === "-1 Hold") {return true;} return false; })(), 'Cards Sequence 3, 7, Q, 8, A should return <code>-1 Hold</code>');
+  - text: Cards Sequence 2, J, 9, 2, 7 should return <code>1 Bet</code>
+    testString: assert((function(){ count = 0; cc(2);cc('J');cc(9);cc(2);var out = cc(7); if(out === "1 Bet") {return true;} return false; })(), 'Cards Sequence 2, J, 9, 2, 7 should return <code>1 Bet</code>');
+  - text: Cards Sequence 2, 2, 10 should return <code>1 Bet</code>
+    testString: assert((function(){ count = 0; cc(2);cc(2);var out = cc(10); if(out === "1 Bet") {return true;} return false; })(), 'Cards Sequence 2, 2, 10 should return <code>1 Bet</code>');
+  - text: Cards Sequence 3, 2, A, 10, K should return <code>-1 Hold</code>
+    testString: assert((function(){ count = 0; cc(3);cc(2);cc('A');cc(10);var out = cc('K'); if(out === "-1 Hold") {return true;} return false; })(), 'Cards Sequence 3, 2, A, 10, K should return <code>-1 Hold</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/create-decimal-numbers-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/create-decimal-numbers-with-javascript.english.md
index 592fdd4c6a..6fc2c3d9b1 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/create-decimal-numbers-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/create-decimal-numbers-with-javascript.english.md
@@ -21,9 +21,9 @@ Create a variable <code>myDecimal</code> and give it a decimal value with a frac
 ```yml
 tests:
   - text: <code>myDecimal</code> should be a number.
-    testString: 'assert(typeof myDecimal === "number", "<code>myDecimal</code> should be a number.");'
+    testString: assert(typeof myDecimal === "number", '<code>myDecimal</code> should be a number.');
   - text: <code>myDecimal</code> should have a decimal point
-    testString: 'assert(myDecimal % 1 != 0, "<code>myDecimal</code> should have a decimal point"); '
+    testString: assert(myDecimal % 1 != 0, '<code>myDecimal</code> should have a decimal point');
 
 ```
 
@@ -49,7 +49,7 @@ var ourDecimal = 5.7;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){if(typeof myDecimal !== "undefined"){return myDecimal;}})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-javascript-variables.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-javascript-variables.english.md
index 9dfd2274b9..cf27848920 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-javascript-variables.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-javascript-variables.english.md
@@ -27,8 +27,8 @@ Use the <code>var</code> keyword to create a variable called <code>myName</code>
 
 ```yml
 tests:
-  - text: 'You should declare <code>myName</code> with the <code>var</code> keyword, ending with a semicolon'
-    testString: 'assert(/var\s+myName\s*;/.test(code), "You should declare <code>myName</code> with the <code>var</code> keyword, ending with a semicolon");'
+  - text: You should declare <code>myName</code> with the <code>var</code> keyword, ending with a semicolon
+    testString: assert(/var\s+myName\s*;/.test(code), 'You should declare <code>myName</code> with the <code>var</code> keyword, ending with a semicolon');
 
 ```
 
@@ -54,7 +54,7 @@ var ourName;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myName !== "undefined"){(function(v){return v;})(myName);}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-string-variables.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-string-variables.english.md
index a380679ae9..b27d8af83f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-string-variables.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-string-variables.english.md
@@ -22,9 +22,9 @@ Create two new <code>string</code> variables: <code>myFirstName</code> and <code
 ```yml
 tests:
   - text: <code>myFirstName</code> should be a string with at least one character in it.
-    testString: 'assert((function(){if(typeof myFirstName !== "undefined" && typeof myFirstName === "string" && myFirstName.length > 0){return true;}else{return false;}})(), "<code>myFirstName</code> should be a string with at least one character in it.");'
+    testString: assert((function(){if(typeof myFirstName !== "undefined" && typeof myFirstName === "string" && myFirstName.length > 0){return true;}else{return false;}})(), '<code>myFirstName</code> should be a string with at least one character in it.');
   - text: <code>myLastName</code> should be a string with at least one character in it.
-    testString: 'assert((function(){if(typeof myLastName !== "undefined" && typeof myLastName === "string" && myLastName.length > 0){return true;}else{return false;}})(), "<code>myLastName</code> should be a string with at least one character in it.");'
+    testString: assert((function(){if(typeof myLastName !== "undefined" && typeof myLastName === "string" && myLastName.length > 0){return true;}else{return false;}})(), '<code>myLastName</code> should be a string with at least one character in it.');
 
 ```
 
@@ -52,7 +52,7 @@ var lastName = "Turing";
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myFirstName !== "undefined" && typeof myLastName !== "undefined"){(function(){return myFirstName + ', ' + myLastName;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript.english.md
index 63fe92e864..7972506ce5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/decrement-a-number-with-javascript.english.md
@@ -24,13 +24,13 @@ Change the code to use the <code>--</code> operator on <code>myVar</code>.
 ```yml
 tests:
   - text: <code>myVar</code> should equal <code>10</code>
-    testString: 'assert(myVar === 10, "<code>myVar</code> should equal <code>10</code>");'
+    testString: assert(myVar === 10, '<code>myVar</code> should equal <code>10</code>');
   - text: <code>myVar = myVar - 1;</code> should be changed
-    testString: 'assert(/var\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code), "<code>myVar = myVar - 1;</code> should be changed");'
+    testString: assert(/var\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code), '<code>myVar = myVar - 1;</code> should be changed');
   - text: Use the <code>--</code> operator on <code>myVar</code>
-    testString: 'assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code), "Use the <code>--</code> operator on <code>myVar</code>");'
+    testString: assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code), 'Use the <code>--</code> operator on <code>myVar</code>');
   - text: Do not change code above the line
-    testString: 'assert(/var myVar = 11;/.test(code), "Do not change code above the line");'
+    testString: assert(/var myVar = 11;/.test(code), 'Do not change code above the line');
 
 ```
 
@@ -56,7 +56,7 @@ myVar = myVar - 1;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'myVar = ' + z;})(myVar);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/delete-properties-from-a-javascript-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/delete-properties-from-a-javascript-object.english.md
index 2f15cbe33e..001d26cf08 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/delete-properties-from-a-javascript-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/delete-properties-from-a-javascript-object.english.md
@@ -21,9 +21,9 @@ Delete the <code>"tails"</code> property from <code>myDog</code>. You may use ei
 ```yml
 tests:
   - text: Delete the property <code>"tails"</code> from <code>myDog</code>.
-    testString: 'assert(typeof myDog === "object" && myDog.tails === undefined, "Delete the property <code>"tails"</code> from <code>myDog</code>.");'
+    testString: assert(typeof myDog === "object" && myDog.tails === undefined, 'Delete the property <code>"tails"</code> from <code>myDog</code>.');
   - text: Do not modify the <code>myDog</code> setup
-    testString: 'assert(code.match(/"tails": 1/g).length > 1, "Do not modify the <code>myDog</code> setup");'
+    testString: 'assert(code.match(/"tails": 1/g).length > 1, ''Do not modify the <code>myDog</code> setup'');'
 
 ```
 
@@ -67,7 +67,7 @@ var myDog = {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return z;})(myDog);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-decimal-by-another-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-decimal-by-another-with-javascript.english.md
index a5bd7726a7..7d86d31cde 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-decimal-by-another-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-decimal-by-another-with-javascript.english.md
@@ -20,11 +20,11 @@ Change the <code>0.0</code> so that <code>quotient</code> will equal to <code>2.
 ```yml
 tests:
   - text: The variable <code>quotient</code> should equal <code>2.2</code>
-    testString: 'assert(quotient === 2.2, "The variable <code>quotient</code> should equal <code>2.2</code>");'
+    testString: assert(quotient === 2.2, 'The variable <code>quotient</code> should equal <code>2.2</code>');
   - text: You should use the <code>/</code> operator to divide 4.4 by 2
-    testString: 'assert(/4\.40*\s*\/\s*2\.*0*/.test(code), "You should use the <code>/</code> operator to divide 4.4 by 2");'
+    testString: assert(/4\.40*\s*\/\s*2\.*0*/.test(code), 'You should use the <code>/</code> operator to divide 4.4 by 2');
   - text: The quotient variable should only be assigned once
-    testString: 'assert(code.match(/quotient/g).length === 1, "The quotient variable should only be assigned once");'
+    testString: assert(code.match(/quotient/g).length === 1, 'The quotient variable should only be assigned once');
 
 ```
 
@@ -48,7 +48,7 @@ var quotient = 0.0 / 2.0; // Fix this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(y){return 'quotient = '+y;})(quotient);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-number-by-another-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-number-by-another-with-javascript.english.md
index 8f1bc34eb8..3fbf58b232 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-number-by-another-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/divide-one-number-by-another-with-javascript.english.md
@@ -25,9 +25,9 @@ Change the <code>0</code> so that the <code>quotient</code> is equal to <code>2<
 ```yml
 tests:
   - text: Make the variable <code>quotient</code> equal to 2.
-    testString: 'assert(quotient === 2, "Make the variable <code>quotient</code> equal to 2.");'
+    testString: assert(quotient === 2, 'Make the variable <code>quotient</code> equal to 2.');
   - text: Use the <code>/</code> operator
-    testString: 'assert(/\d+\s*\/\s*\d+/.test(code), "Use the <code>/</code> operator");'
+    testString: assert(/\d+\s*\/\s*\d+/.test(code), 'Use the <code>/</code> operator');
 
 ```
 
@@ -51,7 +51,7 @@ var quotient = 66 / 0;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'quotient = '+z;})(quotient);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escape-sequences-in-strings.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escape-sequences-in-strings.english.md
index afe17ca76b..632e9f68e4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escape-sequences-in-strings.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escape-sequences-in-strings.english.md
@@ -26,17 +26,17 @@ Here is the text with the escape sequences written out.
 ```yml
 tests:
   - text: <code>myStr</code> should not contain any spaces
-    testString: 'assert(!/ /.test(myStr), "<code>myStr</code> should not contain any spaces");'
-  - text: '<code>myStr</code> should contain the strings <code>FirstLine</code>, <code>SecondLine</code> and <code>ThirdLine</code> (remember case sensitivity)'
-    testString: 'assert(/FirstLine/.test(myStr) && /SecondLine/.test(myStr) && /ThirdLine/.test(myStr), "<code>myStr</code> should contain the strings <code>FirstLine</code>, <code>SecondLine</code> and <code>ThirdLine</code> (remember case sensitivity)");'
+    testString: assert(!/ /.test(myStr), '<code>myStr</code> should not contain any spaces');
+  - text: <code>myStr</code> should contain the strings <code>FirstLine</code>, <code>SecondLine</code> and <code>ThirdLine</code> (remember case sensitivity)
+    testString: assert(/FirstLine/.test(myStr) && /SecondLine/.test(myStr) && /ThirdLine/.test(myStr), '<code>myStr</code> should contain the strings <code>FirstLine</code>, <code>SecondLine</code> and <code>ThirdLine</code> (remember case sensitivity)');
   - text: <code>FirstLine</code> should be followed by the newline character <code>\n</code>
-    testString: 'assert(/FirstLine\n/.test(myStr), "<code>FirstLine</code> should be followed by the newline character <code>\n</code>");'
+    testString: assert(/FirstLine\n/.test(myStr), '<code>FirstLine</code> should be followed by the newline character <code>\n</code>');
   - text: <code>myStr</code> should contain a tab character <code>\t</code> which follows a newline character
-    testString: 'assert(/\n\t/.test(myStr), "<code>myStr</code> should contain a tab character <code>\t</code> which follows a newline character");'
+    testString: assert(/\n\t/.test(myStr), '<code>myStr</code> should contain a tab character <code>\t</code> which follows a newline character');
   - text: <code>SecondLine</code> should be preceded by the backslash character <code>\\</code>
-    testString: 'assert(/\SecondLine/.test(myStr), "<code>SecondLine</code> should be preceded by the backslash character <code>\\</code>");'
+    testString: assert(/\SecondLine/.test(myStr), '<code>SecondLine</code> should be preceded by the backslash character <code>\\</code>');
   - text: There should be a newline character between <code>SecondLine</code> and <code>ThirdLine</code>
-    testString: 'assert(/SecondLine\nThirdLine/.test(myStr), "There should be a newline character between <code>SecondLine</code> and <code>ThirdLine</code>");'
+    testString: assert(/SecondLine\nThirdLine/.test(myStr), 'There should be a newline character between <code>SecondLine</code> and <code>ThirdLine</code>');
 
 ```
 
@@ -60,7 +60,9 @@ var myStr; // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){
+if (myStr !== undefined){
+console.log('myStr:\n' + myStr);}})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escaping-literal-quotes-in-strings.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escaping-literal-quotes-in-strings.english.md
index 157fa56b7a..8cc53e359e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escaping-literal-quotes-in-strings.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/escaping-literal-quotes-in-strings.english.md
@@ -24,10 +24,10 @@ Use <dfn>backslashes</dfn> to assign a string to the <code>myStr</code> variable
 
 ```yml
 tests:
-  - text: 'You should use two double quotes (<code>&quot;</code>) and four escaped double quotes (<code>&#92;&quot;</code>).'
-    testString: 'assert(code.match(/\\"/g).length === 4 && code.match(/[^\\]"/g).length === 2, "You should use two double quotes (<code>&quot;</code>) and four escaped double quotes (<code>&#92;&quot;</code>).");'
+  - text: You should use two double quotes (<code>&quot;</code>) and four escaped double quotes (<code>&#92;&quot;</code>).
+    testString: assert(code.match(/\\"/g).length === 4 && code.match(/[^\\]"/g).length === 2, 'You should use two double quotes (<code>&quot;</code>) and four escaped double quotes (<code>&#92;&quot;</code>).');
   - text: 'Variable myStr should contain the string: <code>I am a "double quoted" string inside "double quotes".</code>'
-    testString: 'assert(myStr === "I am a \"double quoted\" string inside \"double quotes\".", "Variable myStr should contain the string: <code>I am a "double quoted" string inside "double quotes".</code>");'
+    testString: 'assert(myStr === "I am a \"double quoted\" string inside \"double quotes\".", ''Variable myStr should contain the string: <code>I am a "double quoted" string inside "double quotes".</code>'');'
 
 ```
 
@@ -51,7 +51,13 @@ var myStr = ""; // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){
+  if(typeof myStr === 'string') {
+    console.log("myStr = \"" + myStr + "\"");
+  } else {
+    console.log("myStr is undefined");
+  }
+})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/find-the-length-of-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/find-the-length-of-a-string.english.md
index 2bce5af667..625f7ae0f5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/find-the-length-of-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/find-the-length-of-a-string.english.md
@@ -22,9 +22,9 @@ Use the <code>.length</code> property to count the number of characters in the <
 ```yml
 tests:
   - text: <code>lastNameLength</code> should be equal to eight.
-    testString: 'assert((function(){if(typeof lastNameLength !== "undefined" && typeof lastNameLength === "number" && lastNameLength === 8){return true;}else{return false;}})(), "<code>lastNameLength</code> should be equal to eight.");'
+    testString: assert((function(){if(typeof lastNameLength !== "undefined" && typeof lastNameLength === "number" && lastNameLength === 8){return true;}else{return false;}})(), '<code>lastNameLength</code> should be equal to eight.');
   - text: 'You should be getting the length of <code>lastName</code> by using <code>.length</code> like this: <code>lastName.length</code>.'
-    testString: 'assert((function(){if(code.match(/\.length/gi) && code.match(/\.length/gi).length >= 2 && code.match(/var lastNameLength \= 0;/gi) && code.match(/var lastNameLength \= 0;/gi).length >= 1){return true;}else{return false;}})(), "You should be getting the length of <code>lastName</code> by using <code>.length</code> like this: <code>lastName.length</code>.");'
+    testString: 'assert((function(){if(code.match(/\.length/gi) && code.match(/\.length/gi).length >= 2 && code.match(/var lastNameLength \= 0;/gi) && code.match(/var lastNameLength \= 0;/gi).length >= 1){return true;}else{return false;}})(), ''You should be getting the length of <code>lastName</code> by using <code>.length</code> like this: <code>lastName.length</code>.'');'
 
 ```
 
@@ -60,7 +60,7 @@ lastNameLength = lastName;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof lastNameLength !== "undefined"){(function(){return lastNameLength;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/finding-a-remainder-in-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/finding-a-remainder-in-javascript.english.md
index 9ce657d3c4..0182c68577 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/finding-a-remainder-in-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/finding-a-remainder-in-javascript.english.md
@@ -25,11 +25,11 @@ Set <code>remainder</code> equal to the remainder of <code>11</code> divided by
 ```yml
 tests:
   - text: The variable <code>remainder</code> should be initialized
-    testString: 'assert(/var\s+?remainder/.test(code), "The variable <code>remainder</code> should be initialized");'
+    testString: assert(/var\s+?remainder/.test(code), 'The variable <code>remainder</code> should be initialized');
   - text: The value of <code>remainder</code> should be <code>2</code>
-    testString: 'assert(remainder === 2, "The value of <code>remainder</code> should be <code>2</code>");'
+    testString: assert(remainder === 2, 'The value of <code>remainder</code> should be <code>2</code>');
   - text: You should use the <code>%</code> operator
-    testString: 'assert(/\s+?remainder\s*?=\s*?.*%.*;/.test(code), "You should use the <code>%</code> operator");'
+    testString: assert(/\s+?remainder\s*?=\s*?.*%.*;/.test(code), 'You should use the <code>%</code> operator');
 
 ```
 
@@ -54,7 +54,7 @@ var remainder;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(y){return 'remainder = '+y;})(remainder);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-fractions-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-fractions-with-javascript.english.md
index 542fdb5b80..91395c6caa 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-fractions-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-fractions-with-javascript.english.md
@@ -22,11 +22,11 @@ Change <code>randomFraction</code> to return a random number instead of returnin
 ```yml
 tests:
   - text: <code>randomFraction</code> should return a random number.
-    testString: 'assert(typeof randomFraction() === "number", "<code>randomFraction</code> should return a random number.");'
+    testString: assert(typeof randomFraction() === "number", '<code>randomFraction</code> should return a random number.');
   - text: The number returned by <code>randomFraction</code> should be a decimal.
-    testString: 'assert((randomFraction()+""). match(/\./g), "The number returned by <code>randomFraction</code> should be a decimal.");'
+    testString: assert((randomFraction()+''). match(/\./g), 'The number returned by <code>randomFraction</code> should be a decimal.');
   - text: You should be using <code>Math.random</code> to generate the random decimal number.
-    testString: 'assert(code.match(/Math\.random/g).length >= 0, "You should be using <code>Math.random</code> to generate the random decimal number.");'
+    testString: assert(code.match(/Math\.random/g).length >= 0, 'You should be using <code>Math.random</code> to generate the random decimal number.');
 
 ```
 
@@ -55,7 +55,7 @@ function randomFraction() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){return randomFraction();})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-with-javascript.english.md
index 5c753bc9dd..33e4c031e1 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-with-javascript.english.md
@@ -25,13 +25,13 @@ Use this technique to generate and return a random whole number between <code>0<
 ```yml
 tests:
   - text: The result of <code>randomWholeNum</code> should be a whole number.
-    testString: 'assert(typeof randomWholeNum() === "number" && (function(){var r = randomWholeNum();return Math.floor(r) === r;})(), "The result of <code>randomWholeNum</code> should be a whole number.");'
+    testString: assert(typeof randomWholeNum() === "number" && (function(){var r = randomWholeNum();return Math.floor(r) === r;})(), 'The result of <code>randomWholeNum</code> should be a whole number.');
   - text: You should be using <code>Math.random</code> to generate a random number.
-    testString: 'assert(code.match(/Math.random/g).length > 1, "You should be using <code>Math.random</code> to generate a random number.");'
+    testString: assert(code.match(/Math.random/g).length > 1, 'You should be using <code>Math.random</code> to generate a random number.');
   - text: You should have multiplied the result of <code>Math.random</code> by 10 to make it a number that is between zero and nine.
-    testString: 'assert(code.match(/\s*?Math.random\s*?\(\s*?\)\s*?\*\s*?10[\D]\s*?/g) || code.match(/\s*?10\s*?\*\s*?Math.random\s*?\(\s*?\)\s*?/g), "You should have multiplied the result of <code>Math.random</code> by 10 to make it a number that is between zero and nine.");'
+    testString: assert(code.match(/\s*?Math.random\s*?\(\s*?\)\s*?\*\s*?10[\D]\s*?/g) || code.match(/\s*?10\s*?\*\s*?Math.random\s*?\(\s*?\)\s*?/g), 'You should have multiplied the result of <code>Math.random</code> by 10 to make it a number that is between zero and nine.');
   - text: You should use <code>Math.floor</code> to remove the decimal part of the number.
-    testString: 'assert(code.match(/Math.floor/g).length > 1, "You should use <code>Math.floor</code> to remove the decimal part of the number.");'
+    testString: assert(code.match(/Math.floor/g).length > 1, 'You should use <code>Math.floor</code> to remove the decimal part of the number.');
 
 ```
 
@@ -60,7 +60,7 @@ function randomWholeNum() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){return randomWholeNum();})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-within-a-range.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-within-a-range.english.md
index 751c47669d..f1a2dd6890 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-within-a-range.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/generate-random-whole-numbers-within-a-range.english.md
@@ -22,14 +22,14 @@ Create a function called <code>randomRange</code> that takes a range <code>myMin
 
 ```yml
 tests:
-  - text: 'The lowest random number that can be generated by <code>randomRange</code> should be equal to your minimum number, <code>myMin</code>.'
-    testString: 'assert(calcMin === 5, "The lowest random number that can be generated by <code>randomRange</code> should be equal to your minimum number, <code>myMin</code>.");'
-  - text: 'The highest random number that can be generated by <code>randomRange</code> should be equal to your maximum number, <code>myMax</code>.'
-    testString: 'assert(calcMax === 15, "The highest random number that can be generated by <code>randomRange</code> should be equal to your maximum number, <code>myMax</code>.");'
-  - text: 'The random number generated by <code>randomRange</code> should be an integer, not a decimal.'
-    testString: 'assert(randomRange(0,1) % 1 === 0 , "The random number generated by <code>randomRange</code> should be an integer, not a decimal.");'
-  - text: '<code>randomRange</code> should use both <code>myMax</code> and <code>myMin</code>, and return a random number in your range.'
-    testString: 'assert((function(){if(code.match(/myMax/g).length > 1 && code.match(/myMin/g).length > 2 && code.match(/Math.floor/g) && code.match(/Math.random/g)){return true;}else{return false;}})(), "<code>randomRange</code> should use both <code>myMax</code> and <code>myMin</code>, and return a random number in your range.");'
+  - text: The lowest random number that can be generated by <code>randomRange</code> should be equal to your minimum number, <code>myMin</code>.
+    testString: assert(calcMin === 5, 'The lowest random number that can be generated by <code>randomRange</code> should be equal to your minimum number, <code>myMin</code>.');
+  - text: The highest random number that can be generated by <code>randomRange</code> should be equal to your maximum number, <code>myMax</code>.
+    testString: assert(calcMax === 15, 'The highest random number that can be generated by <code>randomRange</code> should be equal to your maximum number, <code>myMax</code>.');
+  - text: The random number generated by <code>randomRange</code> should be an integer, not a decimal.
+    testString: assert(randomRange(0,1) % 1 === 0 , 'The random number generated by <code>randomRange</code> should be an integer, not a decimal.');
+  - text: <code>randomRange</code> should use both <code>myMax</code> and <code>myMin</code>, and return a random number in your range.
+    testString: assert((function(){if(code.match(/myMax/g).length > 1 && code.match(/myMin/g).length > 2 && code.match(/Math.floor/g) && code.match(/Math.random/g)){return true;}else{return false;}})(), '<code>randomRange</code> should use both <code>myMax</code> and <code>myMin</code>, and return a random number in your range.');
 
 ```
 
@@ -68,7 +68,20 @@ var myRandom = randomRange(5, 15);
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+var calcMin = 100;
+var calcMax = -100;
+for(var i = 0; i < 100; i++) {
+  var result = randomRange(5,15);
+  calcMin = Math.min(calcMin, result);
+  calcMax = Math.max(calcMax, result);
+}
+(function(){
+  if(typeof myRandom === 'number') {
+    return "myRandom = " + myRandom;
+  } else {
+    return "myRandom undefined";
+  }
+})()
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-scope-and-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-scope-and-functions.english.md
index 112a6a63fa..1a326d7201 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-scope-and-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-scope-and-functions.english.md
@@ -22,13 +22,13 @@ Inside function <code>fun1</code>, assign <code>5</code> to <code>oopsGlobal</co
 ```yml
 tests:
   - text: <code>myGlobal</code> should be defined
-    testString: 'assert(typeof myGlobal != "undefined", "<code>myGlobal</code> should be defined");'
+    testString: assert(typeof myGlobal != "undefined", '<code>myGlobal</code> should be defined');
   - text: <code>myGlobal</code> should have a value of <code>10</code>
-    testString: 'assert(myGlobal === 10, "<code>myGlobal</code> should have a value of <code>10</code>");'
+    testString: assert(myGlobal === 10, '<code>myGlobal</code> should have a value of <code>10</code>');
   - text: <code>myGlobal</code> should be declared using the <code>var</code> keyword
-    testString: 'assert(/var\s+myGlobal/.test(code), "<code>myGlobal</code> should be declared using the <code>var</code> keyword");'
+    testString: assert(/var\s+myGlobal/.test(code), '<code>myGlobal</code> should be declared using the <code>var</code> keyword');
   - text: <code>oopsGlobal</code> should be a global variable and have a value of <code>5</code>
-    testString: 'assert(typeof oopsGlobal != "undefined" && oopsGlobal === 5, "<code>oopsGlobal</code> should be a global variable and have a value of <code>5</code>");'
+    testString: assert(typeof oopsGlobal != "undefined" && oopsGlobal === 5, '<code>oopsGlobal</code> should be a global variable and have a value of <code>5</code>');
 
 ```
 
@@ -95,7 +95,10 @@ capture();
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+fun1();
+fun2();
+uncapture();
+(function() { return logOutput || "console.log never called"; })();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-vs.-local-scope-in-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-vs.-local-scope-in-functions.english.md
index 1d3744c438..5208da599c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-vs.-local-scope-in-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/global-vs.-local-scope-in-functions.english.md
@@ -23,11 +23,11 @@ Add a local variable to <code>myOutfit</code> function to override the value of
 ```yml
 tests:
   - text: Do not change the value of the global <code>outerWear</code>
-    testString: 'assert(outerWear === "T-Shirt", "Do not change the value of the global <code>outerWear</code>");'
+    testString: assert(outerWear === "T-Shirt", 'Do not change the value of the global <code>outerWear</code>');
   - text: <code>myOutfit</code> should return <code>"sweater"</code>
-    testString: 'assert(myOutfit() === "sweater", "<code>myOutfit</code> should return <code>"sweater"</code>");'
+    testString: assert(myOutfit() === "sweater", '<code>myOutfit</code> should return <code>"sweater"</code>');
   - text: Do not change the return statement
-    testString: 'assert(/return outerWear/.test(code), "Do not change the return statement");'
+    testString: assert(/return outerWear/.test(code), 'Do not change the return statement');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/golf-code.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/golf-code.english.md
index 2d78471a45..ad71aea32a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/golf-code.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/golf-code.english.md
@@ -22,28 +22,28 @@ Your function will be passed <code>par</code> and <code>strokes</code> arguments
 
 ```yml
 tests:
-  - text: '<code>golfScore(4, 1)</code> should return "Hole-in-one!"'
-    testString: 'assert(golfScore(4, 1) === "Hole-in-one!", "<code>golfScore(4, 1)</code> should return "Hole-in-one!"");'
-  - text: '<code>golfScore(4, 2)</code> should return "Eagle"'
-    testString: 'assert(golfScore(4, 2) === "Eagle", "<code>golfScore(4, 2)</code> should return "Eagle"");'
-  - text: '<code>golfScore(5, 2)</code> should return "Eagle"'
-    testString: 'assert(golfScore(5, 2) === "Eagle", "<code>golfScore(5, 2)</code> should return "Eagle"");'
-  - text: '<code>golfScore(4, 3)</code> should return "Birdie"'
-    testString: 'assert(golfScore(4, 3) === "Birdie", "<code>golfScore(4, 3)</code> should return "Birdie"");'
-  - text: '<code>golfScore(4, 4)</code> should return "Par"'
-    testString: 'assert(golfScore(4, 4) === "Par", "<code>golfScore(4, 4)</code> should return "Par"");'
-  - text: '<code>golfScore(1, 1)</code> should return "Hole-in-one!"'
-    testString: 'assert(golfScore(1, 1) === "Hole-in-one!", "<code>golfScore(1, 1)</code> should return "Hole-in-one!"");'
-  - text: '<code>golfScore(5, 5)</code> should return "Par"'
-    testString: 'assert(golfScore(5, 5) === "Par", "<code>golfScore(5, 5)</code> should return "Par"");'
-  - text: '<code>golfScore(4, 5)</code> should return "Bogey"'
-    testString: 'assert(golfScore(4, 5) === "Bogey", "<code>golfScore(4, 5)</code> should return "Bogey"");'
-  - text: '<code>golfScore(4, 6)</code> should return "Double Bogey"'
-    testString: 'assert(golfScore(4, 6) === "Double Bogey", "<code>golfScore(4, 6)</code> should return "Double Bogey"");'
-  - text: '<code>golfScore(4, 7)</code> should return "Go Home!"'
-    testString: 'assert(golfScore(4, 7) === "Go Home!", "<code>golfScore(4, 7)</code> should return "Go Home!"");'
-  - text: '<code>golfScore(5, 9)</code> should return "Go Home!"'
-    testString: 'assert(golfScore(5, 9) === "Go Home!", "<code>golfScore(5, 9)</code> should return "Go Home!"");'
+  - text: <code>golfScore(4, 1)</code> should return "Hole-in-one!"
+    testString: assert(golfScore(4, 1) === "Hole-in-one!", '<code>golfScore(4, 1)</code> should return "Hole-in-one!"');
+  - text: <code>golfScore(4, 2)</code> should return "Eagle"
+    testString: assert(golfScore(4, 2) === "Eagle", '<code>golfScore(4, 2)</code> should return "Eagle"');
+  - text: <code>golfScore(5, 2)</code> should return "Eagle"
+    testString: assert(golfScore(5, 2) === "Eagle", '<code>golfScore(5, 2)</code> should return "Eagle"');
+  - text: <code>golfScore(4, 3)</code> should return "Birdie"
+    testString: assert(golfScore(4, 3) === "Birdie", '<code>golfScore(4, 3)</code> should return "Birdie"');
+  - text: <code>golfScore(4, 4)</code> should return "Par"
+    testString: assert(golfScore(4, 4) === "Par", '<code>golfScore(4, 4)</code> should return "Par"');
+  - text: <code>golfScore(1, 1)</code> should return "Hole-in-one!"
+    testString: assert(golfScore(1, 1) === "Hole-in-one!", '<code>golfScore(1, 1)</code> should return "Hole-in-one!"');
+  - text: <code>golfScore(5, 5)</code> should return "Par"
+    testString: assert(golfScore(5, 5) === "Par", '<code>golfScore(5, 5)</code> should return "Par"');
+  - text: <code>golfScore(4, 5)</code> should return "Bogey"
+    testString: assert(golfScore(4, 5) === "Bogey", '<code>golfScore(4, 5)</code> should return "Bogey"');
+  - text: <code>golfScore(4, 6)</code> should return "Double Bogey"
+    testString: assert(golfScore(4, 6) === "Double Bogey", '<code>golfScore(4, 6)</code> should return "Double Bogey"');
+  - text: <code>golfScore(4, 7)</code> should return "Go Home!"
+    testString: assert(golfScore(4, 7) === "Go Home!", '<code>golfScore(4, 7)</code> should return "Go Home!"');
+  - text: <code>golfScore(5, 9)</code> should return "Go Home!"
+    testString: assert(golfScore(5, 9) === "Go Home!", '<code>golfScore(5, 9)</code> should return "Go Home!"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/increment-a-number-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/increment-a-number-with-javascript.english.md
index bcaf82be12..e9fe606c69 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/increment-a-number-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/increment-a-number-with-javascript.english.md
@@ -25,13 +25,13 @@ Change the code to use the <code>++</code> operator on <code>myVar</code>.
 ```yml
 tests:
   - text: <code>myVar</code> should equal <code>88</code>
-    testString: 'assert(myVar === 88, "<code>myVar</code> should equal <code>88</code>");'
+    testString: assert(myVar === 88, '<code>myVar</code> should equal <code>88</code>');
   - text: <code>myVar = myVar + 1;</code> should be changed
-    testString: 'assert(/var\s*myVar\s*=\s*87;\s*\/*.*\s*([+]{2}\s*myVar|myVar\s*[+]{2});/.test(code), "<code>myVar = myVar + 1;</code> should be changed");'
+    testString: assert(/var\s*myVar\s*=\s*87;\s*\/*.*\s*([+]{2}\s*myVar|myVar\s*[+]{2});/.test(code), '<code>myVar = myVar + 1;</code> should be changed');
   - text: Use the <code>++</code> operator
-    testString: 'assert(/[+]{2}\s*myVar|myVar\s*[+]{2}/.test(code), "Use the <code>++</code> operator");'
+    testString: assert(/[+]{2}\s*myVar|myVar\s*[+]{2}/.test(code), 'Use the <code>++</code> operator');
   - text: Do not change code above the line
-    testString: 'assert(/var myVar = 87;/.test(code), "Do not change code above the line");'
+    testString: assert(/var myVar = 87;/.test(code), 'Do not change code above the line');
 
 ```
 
@@ -57,7 +57,7 @@ myVar = myVar + 1;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'myVar = ' + z;})(myVar);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/initializing-variables-with-the-assignment-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/initializing-variables-with-the-assignment-operator.english.md
index f2432274a0..342b76a97d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/initializing-variables-with-the-assignment-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/initializing-variables-with-the-assignment-operator.english.md
@@ -22,7 +22,7 @@ Define a variable <code>a</code> with <code>var</code> and initialize it to a va
 ```yml
 tests:
   - text: Initialize <code>a</code> to a value of <code>9</code>
-    testString: 'assert(/var\s+a\s*=\s*9\s*/.test(code), "Initialize <code>a</code> to a value of <code>9</code>");'
+    testString: assert(/var\s+a\s*=\s*9\s*/.test(code), 'Initialize <code>a</code> to a value of <code>9</code>');
 
 ```
 
@@ -48,7 +48,7 @@ var ourVar = 19;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof a !== 'undefined') {(function(a){return "a = " + a;})(a);} else { (function() {return 'a is undefined';})(); }
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-if-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-if-statements.english.md
index bc3beee694..1e2649586a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-if-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-if-statements.english.md
@@ -21,21 +21,21 @@ Convert the logic to use <code>else if</code> statements.
 ```yml
 tests:
   - text: You should have at least two <code>else</code> statements
-    testString: 'assert(code.match(/else/g).length > 1, "You should have at least two <code>else</code> statements");'
+    testString: assert(code.match(/else/g).length > 1, 'You should have at least two <code>else</code> statements');
   - text: You should have at least two <code>if</code> statements
-    testString: 'assert(code.match(/if/g).length > 1, "You should have at least two <code>if</code> statements");'
+    testString: assert(code.match(/if/g).length > 1, 'You should have at least two <code>if</code> statements');
   - text: You should have closing and opening curly braces for each condition
-    testString: 'assert(code.match(/if\s*\((.+)\)\s*\{[\s\S]+\}\s*else if\s*\((.+)\)\s*\{[\s\S]+\}\s*else\s*\{[\s\S]+\s*\}/), "You should have closing and opening curly braces for each condition in your if else statement");'
+    testString: assert(code.match(/if\s*\((.+)\)\s*\{[\s\S]+\}\s*else if\s*\((.+)\)\s*\{[\s\S]+\}\s*else\s*\{[\s\S]+\s*\}/), 'You should have closing and opening curly braces for each condition in your if else statement');
   - text: <code>testElseIf(0)</code> should return "Smaller than 5"
-    testString: 'assert(testElseIf(0) === "Smaller than 5", "<code>testElseIf(0)</code> should return "Smaller than 5"");'
+    testString: assert(testElseIf(0) === "Smaller than 5", '<code>testElseIf(0)</code> should return "Smaller than 5"');
   - text: <code>testElseIf(5)</code> should return "Between 5 and 10"
-    testString: 'assert(testElseIf(5) === "Between 5 and 10", "<code>testElseIf(5)</code> should return "Between 5 and 10"");'
+    testString: assert(testElseIf(5) === "Between 5 and 10", '<code>testElseIf(5)</code> should return "Between 5 and 10"');
   - text: <code>testElseIf(7)</code> should return "Between 5 and 10"
-    testString: 'assert(testElseIf(7) === "Between 5 and 10", "<code>testElseIf(7)</code> should return "Between 5 and 10"");'
+    testString: assert(testElseIf(7) === "Between 5 and 10", '<code>testElseIf(7)</code> should return "Between 5 and 10"');
   - text: <code>testElseIf(10)</code> should return "Between 5 and 10"
-    testString: 'assert(testElseIf(10) === "Between 5 and 10", "<code>testElseIf(10)</code> should return "Between 5 and 10"");'
+    testString: assert(testElseIf(10) === "Between 5 and 10", '<code>testElseIf(10)</code> should return "Between 5 and 10"');
   - text: <code>testElseIf(12)</code> should return "Greater than 10"
-    testString: 'assert(testElseIf(12) === "Greater than 10", "<code>testElseIf(12)</code> should return "Greater than 10"");'
+    testString: assert(testElseIf(12) === "Greater than 10", '<code>testElseIf(12)</code> should return "Greater than 10"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-statements.english.md
index b5cb8eefc9..32cfa259a5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/introducing-else-statements.english.md
@@ -21,19 +21,19 @@ Combine the <code>if</code> statements into a single <code>if/else</code> statem
 ```yml
 tests:
   - text: You should only have one <code>if</code> statement in the editor
-    testString: 'assert(code.match(/if/g).length === 1, "You should only have one <code>if</code> statement in the editor");'
+    testString: assert(code.match(/if/g).length === 1, 'You should only have one <code>if</code> statement in the editor');
   - text: You should use an <code>else</code> statement
-    testString: 'assert(/else/g.test(code), "You should use an <code>else</code> statement");'
+    testString: assert(/else/g.test(code), 'You should use an <code>else</code> statement');
   - text: <code>testElse(4)</code> should return "5 or Smaller"
-    testString: 'assert(testElse(4) === "5 or Smaller", "<code>testElse(4)</code> should return "5 or Smaller"");'
+    testString: assert(testElse(4) === "5 or Smaller", '<code>testElse(4)</code> should return "5 or Smaller"');
   - text: <code>testElse(5)</code> should return "5 or Smaller"
-    testString: 'assert(testElse(5) === "5 or Smaller", "<code>testElse(5)</code> should return "5 or Smaller"");'
+    testString: assert(testElse(5) === "5 or Smaller", '<code>testElse(5)</code> should return "5 or Smaller"');
   - text: <code>testElse(6)</code> should return "Bigger than 5"
-    testString: 'assert(testElse(6) === "Bigger than 5", "<code>testElse(6)</code> should return "Bigger than 5"");'
+    testString: assert(testElse(6) === "Bigger than 5", '<code>testElse(6)</code> should return "Bigger than 5"');
   - text: <code>testElse(10)</code> should return "Bigger than 5"
-    testString: 'assert(testElse(10) === "Bigger than 5", "<code>testElse(10)</code> should return "Bigger than 5"");'
+    testString: assert(testElse(10) === "Bigger than 5", '<code>testElse(10)</code> should return "Bigger than 5"');
   - text: Do not change the code above or below the lines.
-    testString: 'assert(/var result = "";/.test(code) && /return result;/.test(code), "Do not change the code above or below the lines.");'
+    testString: assert(/var result = "";/.test(code) && /return result;/.test(code), 'Do not change the code above or below the lines.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-odd-numbers-with-a-for-loop.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-odd-numbers-with-a-for-loop.english.md
index 2ce2566ae9..79dc31718b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-odd-numbers-with-a-for-loop.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-odd-numbers-with-a-for-loop.english.md
@@ -24,9 +24,9 @@ Push the odd numbers from 1 through 9 to <code>myArray</code> using a <code>for<
 ```yml
 tests:
   - text: You should be using a <code>for</code> loop for this.
-    testString: 'assert(code.match(/for\s*\(/g).length > 1, "You should be using a <code>for</code> loop for this.");'
-  - text: '<code>myArray</code> should equal <code>[1,3,5,7,9]</code>.'
-    testString: 'assert.deepEqual(myArray, [1,3,5,7,9], "<code>myArray</code> should equal <code>[1,3,5,7,9]</code>.");'
+    testString: assert(code.match(/for\s*\(/g).length > 1, 'You should be using a <code>for</code> loop for this.');
+  - text: <code>myArray</code> should equal <code>[1,3,5,7,9]</code>.
+    testString: assert.deepEqual(myArray, [1,3,5,7,9], '<code>myArray</code> should equal <code>[1,3,5,7,9]</code>.');
 
 ```
 
@@ -60,7 +60,7 @@ var myArray = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md
index 76ee2ea943..049734e3e7 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop.english.md
@@ -22,13 +22,13 @@ Declare and initialize a variable <code>total</code> to <code>0</code>. Use a <c
 ```yml
 tests:
   - text: <code>total</code> should be declared and initialized to 0
-    testString: 'assert(code.match(/var.*?total\s*=\s*0.*?;/), "<code>total</code> should be declared and initialized to 0");'
+    testString: assert(code.match(/var.*?total\s*=\s*0.*?;/), '<code>total</code> should be declared and initialized to 0');
   - text: <code>total</code> should equal 20
-    testString: 'assert(total === 20, "<code>total</code> should equal 20");'
+    testString: assert(total === 20, '<code>total</code> should equal 20');
   - text: You should use a <code>for</code> loop to iterate through <code>myArr</code>
-    testString: 'assert(code.match(/for\s*\(/g).length > 1 && code.match(/myArr\s*\[/), "You should use a <code>for</code> loop to iterate through <code>myArr</code>");'
+    testString: assert(code.match(/for\s*\(/g).length > 1 && code.match(/myArr\s*\[/), 'You should use a <code>for</code> loop to iterate through <code>myArr</code>');
   - text: Do not set <code>total</code> to 20 directly
-    testString: 'assert(!code.match(/total[\s\+\-]*=\s*(\d(?!\s*[;,])|[1-9])/g), "Do not set <code>total</code> to 20 directly");'
+    testString: assert(!code.match(/total[\s\+\-]*=\s*(\d(?!\s*[;,])|[1-9])/g), 'Do not set <code>total</code> to 20 directly');
 
 ```
 
@@ -63,7 +63,7 @@ var myArr = [ 2, 3, 4, 5, 6];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(){if(typeof total !== 'undefined') { return "total = " + total; } else { return "total is undefined";}})()
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-do...while-loops.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-do...while-loops.english.md
index da1dfd34d1..c583a94fe7 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-do...while-loops.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-do...while-loops.english.md
@@ -31,11 +31,11 @@ Change the <code>while</code> loop in the code to a <code>do...while</code> loop
 ```yml
 tests:
   - text: You should be using a <code>do...while</code> loop for this.
-    testString: 'assert(code.match(/do/g), "You should be using a <code>do...while</code> loop for this.");'
-  - text: '<code>myArray</code> should equal <code>[10]</code>.'
-    testString: 'assert.deepEqual(myArray, [10], "<code>myArray</code> should equal <code>[10]</code>.");'
+    testString: assert(code.match(/do/g), 'You should be using a <code>do...while</code> loop for this.');
+  - text: <code>myArray</code> should equal <code>[10]</code>.
+    testString: assert.deepEqual(myArray, [10], '<code>myArray</code> should equal <code>[10]</code>.');
   - text: <code>i</code> should equal <code>11</code>
-    testString: 'assert.deepEqual(i, 11, "<code>i</code> should equal <code>11</code>");'
+    testString: assert.deepEqual(i, 11, '<code>i</code> should equal <code>11</code>');
 
 ```
 
@@ -67,7 +67,7 @@ while (i < 5) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops.english.md
index e731cbaf23..001baba042 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-for-loops.english.md
@@ -29,9 +29,9 @@ Use a <code>for</code> loop to work to push the values 1 through 5 onto <code>my
 ```yml
 tests:
   - text: You should be using a <code>for</code> loop for this.
-    testString: 'assert(code.match(/for\s*\(/g).length > 1, "You should be using a <code>for</code> loop for this.");'
-  - text: '<code>myArray</code> should equal <code>[1,2,3,4,5]</code>.'
-    testString: 'assert.deepEqual(myArray, [1,2,3,4,5], "<code>myArray</code> should equal <code>[1,2,3,4,5]</code>.");'
+    testString: assert(code.match(/for\s*\(/g).length > 1, 'You should be using a <code>for</code> loop for this.');
+  - text: <code>myArray</code> should equal <code>[1,2,3,4,5]</code>.
+    testString: assert.deepEqual(myArray, [1,2,3,4,5], '<code>myArray</code> should equal <code>[1,2,3,4,5]</code>.');
 
 ```
 
@@ -65,7 +65,7 @@ var myArray = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if (typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-while-loops.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-while-loops.english.md
index fb6bef7597..fdf269f3ad 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-while-loops.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-with-javascript-while-loops.english.md
@@ -23,9 +23,9 @@ Push the numbers 0 through 4 to <code>myArray</code> using a <code>while</code>
 ```yml
 tests:
   - text: You should be using a <code>while</code> loop for this.
-    testString: 'assert(code.match(/while/g), "You should be using a <code>while</code> loop for this.");'
-  - text: '<code>myArray</code> should equal <code>[0,1,2,3,4]</code>.'
-    testString: 'assert.deepEqual(myArray, [0,1,2,3,4], "<code>myArray</code> should equal <code>[0,1,2,3,4]</code>.");'
+    testString: assert(code.match(/while/g), 'You should be using a <code>while</code> loop for this.');
+  - text: <code>myArray</code> should equal <code>[0,1,2,3,4]</code>.
+    testString: assert.deepEqual(myArray, [0,1,2,3,4], '<code>myArray</code> should equal <code>[0,1,2,3,4]</code>.');
 
 ```
 
@@ -52,7 +52,7 @@ var myArray = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/local-scope-and-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/local-scope-and-functions.english.md
index 3ad36fb078..f52135d331 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/local-scope-and-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/local-scope-and-functions.english.md
@@ -24,9 +24,9 @@ Declare a local variable <code>myVar</code> inside <code>myLocalScope</code>. Ru
 ```yml
 tests:
   - text: No global <code>myVar</code> variable
-    testString: 'assert(typeof myVar === "undefined", "No global <code>myVar</code> variable");'
+    testString: assert(typeof myVar === 'undefined', 'No global <code>myVar</code> variable');
   - text: Add a local <code>myVar</code> variable
-    testString: 'assert(/var\s+myVar/.test(code), "Add a local <code>myVar</code> variable");'
+    testString: assert(/var\s+myVar/.test(code), 'Add a local <code>myVar</code> variable');
 
 ```
 
@@ -86,7 +86,8 @@ function uncapture() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+typeof myLocalScope === 'function' && (capture(), myLocalScope(), uncapture());
+(function() { return logOutput || "console.log never called"; })();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/logical-order-in-if-else-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/logical-order-in-if-else-statements.english.md
index d2179d1258..f4f506eaca 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/logical-order-in-if-else-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/logical-order-in-if-else-statements.english.md
@@ -28,11 +28,11 @@ Change the order of logic in the function so that it will return the correct sta
 ```yml
 tests:
   - text: <code>orderMyLogic(4)</code> should return "Less than 5"
-    testString: 'assert(orderMyLogic(4) === "Less than 5", "<code>orderMyLogic(4)</code> should return "Less than 5"");'
+    testString: assert(orderMyLogic(4) === "Less than 5", '<code>orderMyLogic(4)</code> should return "Less than 5"');
   - text: <code>orderMyLogic(6)</code> should return "Less than 10"
-    testString: 'assert(orderMyLogic(6) === "Less than 10", "<code>orderMyLogic(6)</code> should return "Less than 10"");'
+    testString: assert(orderMyLogic(6) === "Less than 10", '<code>orderMyLogic(6)</code> should return "Less than 10"');
   - text: <code>orderMyLogic(11)</code> should return "Greater than or equal to 10"
-    testString: 'assert(orderMyLogic(11) === "Greater than or equal to 10", "<code>orderMyLogic(11)</code> should return "Greater than or equal to 10"");'
+    testString: assert(orderMyLogic(11) === "Greater than or equal to 10", '<code>orderMyLogic(11)</code> should return "Greater than or equal to 10"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-pop.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-pop.english.md
index 5bc39d28df..35ea8b3c40 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-pop.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-pop.english.md
@@ -22,12 +22,12 @@ Use the <code>.pop()</code> function to remove the last item from <code>myArray<
 
 ```yml
 tests:
-  - text: '<code>myArray</code> should only contain <code>[["John", 23]]</code>.'
-    testString: 'assert((function(d){if(d[0][0] == "John" && d[0][1] === 23 && d[1] == undefined){return true;}else{return false;}})(myArray), "<code>myArray</code> should only contain <code>[["John", 23]]</code>.");'
+  - text: <code>myArray</code> should only contain <code>[["John", 23]]</code>.
+    testString: assert((function(d){if(d[0][0] == 'John' && d[0][1] === 23 && d[1] == undefined){return true;}else{return false;}})(myArray), '<code>myArray</code> should only contain <code>[["John", 23]]</code>.');
   - text: Use <code>pop()</code> on <code>myArray</code>
-    testString: 'assert(/removedFromMyArray\s*=\s*myArray\s*.\s*pop\s*(\s*)/.test(code), "Use <code>pop()</code> on <code>myArray</code>");'
-  - text: '<code>removedFromMyArray</code> should only contain <code>["cat", 2]</code>.'
-    testString: 'assert((function(d){if(d[0] == "cat" && d[1] === 2 && d[2] == undefined){return true;}else{return false;}})(removedFromMyArray), "<code>removedFromMyArray</code> should only contain <code>["cat", 2]</code>.");'
+    testString: assert(/removedFromMyArray\s*=\s*myArray\s*.\s*pop\s*(\s*)/.test(code), 'Use <code>pop()</code> on <code>myArray</code>');
+  - text: <code>removedFromMyArray</code> should only contain <code>["cat", 2]</code>.
+    testString: assert((function(d){if(d[0] == 'cat' && d[1] === 2 && d[2] == undefined){return true;}else{return false;}})(removedFromMyArray), '<code>removedFromMyArray</code> should only contain <code>["cat", 2]</code>.');
 
 ```
 
@@ -60,7 +60,7 @@ var removedFromMyArray;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(y, z){return 'myArray = ' + JSON.stringify(y) + ' & removedFromMyArray = ' + JSON.stringify(z);})(myArray, removedFromMyArray);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-push.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-push.english.md
index 18328c14ea..e42224fc0c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-push.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-push.english.md
@@ -21,8 +21,8 @@ Push <code>["dog", 3]</code> onto the end of the <code>myArray</code> variable.
 
 ```yml
 tests:
-  - text: '<code>myArray</code> should now equal <code>[["John", 23], ["cat", 2], ["dog", 3]]</code>.'
-    testString: 'assert((function(d){if(d[2] != undefined && d[0][0] == "John" && d[0][1] === 23 && d[2][0] == "dog" && d[2][1] === 3 && d[2].length == 2){return true;}else{return false;}})(myArray), "<code>myArray</code> should now equal <code>[["John", 23], ["cat", 2], ["dog", 3]]</code>.");'
+  - text: <code>myArray</code> should now equal <code>[["John", 23], ["cat", 2], ["dog", 3]]</code>.
+    testString: assert((function(d){if(d[2] != undefined && d[0][0] == 'John' && d[0][1] === 23 && d[2][0] == 'dog' && d[2][1] === 3 && d[2].length == 2){return true;}else{return false;}})(myArray), '<code>myArray</code> should now equal <code>[["John", 23], ["cat", 2], ["dog", 3]]</code>.');
 
 ```
 
@@ -54,7 +54,7 @@ var myArray = [["John", 23], ["cat", 2]];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'myArray = ' + JSON.stringify(z);})(myArray);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-shift.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-shift.english.md
index 49c28db7ad..14483e8200 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-shift.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-shift.english.md
@@ -20,10 +20,10 @@ Use the <code>.shift()</code> function to remove the first item from <code>myArr
 
 ```yml
 tests:
-  - text: '<code>myArray</code> should now equal <code>[["dog", 3]]</code>.'
-    testString: 'assert((function(d){if(d[0][0] == "dog" && d[0][1] === 3 && d[1] == undefined){return true;}else{return false;}})(myArray), "<code>myArray</code> should now equal <code>[["dog", 3]]</code>.");'
-  - text: '<code>removedFromMyArray</code> should contain <code>["John", 23]</code>.'
-    testString: 'assert((function(d){if(d[0] == "John" && d[1] === 23 && typeof removedFromMyArray === "object"){return true;}else{return false;}})(removedFromMyArray), "<code>removedFromMyArray</code> should contain <code>["John", 23]</code>.");'
+  - text: <code>myArray</code> should now equal <code>[["dog", 3]]</code>.
+    testString: assert((function(d){if(d[0][0] == 'dog' && d[0][1] === 3 && d[1] == undefined){return true;}else{return false;}})(myArray), '<code>myArray</code> should now equal <code>[["dog", 3]]</code>.');
+  - text: <code>removedFromMyArray</code> should contain <code>["John", 23]</code>.
+    testString: assert((function(d){if(d[0] == 'John' && d[1] === 23 && typeof removedFromMyArray === 'object'){return true;}else{return false;}})(removedFromMyArray), '<code>removedFromMyArray</code> should contain <code>["John", 23]</code>.');
 
 ```
 
@@ -56,7 +56,7 @@ var removedFromMyArray;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(y, z){return 'myArray = ' + JSON.stringify(y) + ' & removedFromMyArray = ' + JSON.stringify(z);})(myArray, removedFromMyArray);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-unshift.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-unshift.english.md
index b575881c07..0cd76a64a4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-unshift.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulate-arrays-with-unshift.english.md
@@ -20,8 +20,8 @@ Add <code>["Paul",35]</code> to the beginning of the <code>myArray</code> variab
 
 ```yml
 tests:
-  - text: '<code>myArray</code> should now have [["Paul", 35], ["dog", 3]].'
-    testString: 'assert((function(d){if(typeof d[0] === "object" && d[0][0] == "Paul" && d[0][1] === 35 && d[1][0] != undefined && d[1][0] == "dog" && d[1][1] != undefined && d[1][1] == 3){return true;}else{return false;}})(myArray), "<code>myArray</code> should now have [["Paul", 35], ["dog", 3]].");'
+  - text: <code>myArray</code> should now have [["Paul", 35], ["dog", 3]].
+    testString: assert((function(d){if(typeof d[0] === "object" && d[0][0] == 'Paul' && d[0][1] === 35 && d[1][0] != undefined && d[1][0] == 'dog' && d[1][1] != undefined && d[1][1] == 3){return true;}else{return false;}})(myArray), '<code>myArray</code> should now have [["Paul", 35], ["dog", 3]].');
 
 ```
 
@@ -55,7 +55,7 @@ myArray.shift();
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(y, z){return 'myArray = ' + JSON.stringify(y);})(myArray);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulating-complex-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulating-complex-objects.english.md
index c200dd3aaf..e1fbca42c6 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulating-complex-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/manipulating-complex-objects.english.md
@@ -27,23 +27,23 @@ Add a new album to the <code>myMusic</code> array. Add <code>artist</code> and <
 ```yml
 tests:
   - text: <code>myMusic</code> should be an array
-    testString: 'assert(Array.isArray(myMusic), "<code>myMusic</code> should be an array");'
+    testString: assert(Array.isArray(myMusic), '<code>myMusic</code> should be an array');
   - text: <code>myMusic</code> should have at least two elements
-    testString: 'assert(myMusic.length > 1, "<code>myMusic</code> should have at least two elements");'
-  - text: '<code>myMusic[1]</code> should be an object'
-    testString: 'assert(typeof myMusic[1] === "object", "<code>myMusic[1]</code> should be an object");'
-  - text: '<code>myMusic[1]</code> should have at least 4 properties'
-    testString: 'assert(Object.keys(myMusic[1]).length > 3, "<code>myMusic[1]</code> should have at least 4 properties");'
-  - text: '<code>myMusic[1]</code> should contain an <code>artist</code> property which is a string'
-    testString: 'assert(myMusic[1].hasOwnProperty("artist") && typeof myMusic[1].artist === "string", "<code>myMusic[1]</code> should contain an <code>artist</code> property which is a string");'
-  - text: '<code>myMusic[1]</code> should  contain a <code>title</code> property which is a string'
-    testString: 'assert(myMusic[1].hasOwnProperty("title") && typeof myMusic[1].title === "string", "<code>myMusic[1]</code> should  contain a <code>title</code> property which is a string");'
-  - text: '<code>myMusic[1]</code> should contain a <code>release_year</code> property which is a number'
-    testString: 'assert(myMusic[1].hasOwnProperty("release_year") && typeof myMusic[1].release_year === "number", "<code>myMusic[1]</code> should contain a <code>release_year</code> property which is a number");'
-  - text: '<code>myMusic[1]</code> should contain a <code>formats</code> property which is an array'
-    testString: 'assert(myMusic[1].hasOwnProperty("formats") && Array.isArray(myMusic[1].formats), "<code>myMusic[1]</code> should contain a <code>formats</code> property which is an array");'
+    testString: assert(myMusic.length > 1, '<code>myMusic</code> should have at least two elements');
+  - text: <code>myMusic[1]</code> should be an object
+    testString: assert(typeof myMusic[1] === 'object', '<code>myMusic[1]</code> should be an object');
+  - text: <code>myMusic[1]</code> should have at least 4 properties
+    testString: assert(Object.keys(myMusic[1]).length > 3, '<code>myMusic[1]</code> should have at least 4 properties');
+  - text: <code>myMusic[1]</code> should contain an <code>artist</code> property which is a string
+    testString: assert(myMusic[1].hasOwnProperty('artist') && typeof myMusic[1].artist === 'string', '<code>myMusic[1]</code> should contain an <code>artist</code> property which is a string');
+  - text: <code>myMusic[1]</code> should  contain a <code>title</code> property which is a string
+    testString: assert(myMusic[1].hasOwnProperty('title') && typeof myMusic[1].title === 'string', '<code>myMusic[1]</code> should  contain a <code>title</code> property which is a string');
+  - text: <code>myMusic[1]</code> should contain a <code>release_year</code> property which is a number
+    testString: assert(myMusic[1].hasOwnProperty('release_year') && typeof myMusic[1].release_year === 'number', '<code>myMusic[1]</code> should contain a <code>release_year</code> property which is a number');
+  - text: <code>myMusic[1]</code> should contain a <code>formats</code> property which is an array
+    testString: assert(myMusic[1].hasOwnProperty('formats') && Array.isArray(myMusic[1].formats), '<code>myMusic[1]</code> should contain a <code>formats</code> property which is an array');
   - text: <code>formats</code> should be an array of strings with at least two elements
-    testString: 'assert(myMusic[1].formats.every(function(item) { return (typeof item === "string")}) && myMusic[1].formats.length > 1, "<code>formats</code> should be an array of strings with at least two elements");'
+    testString: assert(myMusic[1].formats.every(function(item) { return (typeof item === "string")}) && myMusic[1].formats.length > 1, '<code>formats</code> should be an array of strings with at least two elements');
 
 ```
 
@@ -79,7 +79,7 @@ var myMusic = [
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(x){ if (Array.isArray(x)) { return JSON.stringify(x); } return "myMusic is not an array"})(myMusic);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/modify-array-data-with-indexes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/modify-array-data-with-indexes.english.md
index dc21d21a03..bd5e508368 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/modify-array-data-with-indexes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/modify-array-data-with-indexes.english.md
@@ -22,10 +22,10 @@ Modify the data stored at index <code>0</code> of <code>myArray</code> to a valu
 
 ```yml
 tests:
-  - text: '<code>myArray</code> should now be [45,64,99].'
-    testString: 'assert((function(){if(typeof myArray != "undefined" && myArray[0] == 45 && myArray[1] == 64 && myArray[2] == 99){return true;}else{return false;}})(), "<code>myArray</code> should now be [45,64,99].");'
+  - text: <code>myArray</code> should now be [45,64,99].
+    testString: assert((function(){if(typeof myArray != 'undefined' && myArray[0] == 45 && myArray[1] == 64 && myArray[2] == 99){return true;}else{return false;}})(), '<code>myArray</code> should now be [45,64,99].');
   - text: You should be using correct index to modify the value in <code>myArray</code>.
-    testString: 'assert((function(){if(code.match(/myArray\[0\]\s*=\s*/g)){return true;}else{return false;}})(), "You should be using correct index to modify the value in <code>myArray</code>.");'
+    testString: assert((function(){if(code.match(/myArray\[0\]\s*=\s*/g)){return true;}else{return false;}})(), 'You should be using correct index to modify the value in <code>myArray</code>.');
 
 ```
 
@@ -56,7 +56,7 @@ var myArray = [18,64,99];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiple-identical-options-in-switch-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiple-identical-options-in-switch-statements.english.md
index 7907581e8b..64167336f5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiple-identical-options-in-switch-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiple-identical-options-in-switch-statements.english.md
@@ -23,27 +23,27 @@ Write a switch statement to set <code>answer</code> for the following ranges:<br
 ```yml
 tests:
   - text: <code>sequentialSizes(1)</code> should return "Low"
-    testString: 'assert(sequentialSizes(1) === "Low", "<code>sequentialSizes(1)</code> should return "Low"");'
+    testString: assert(sequentialSizes(1) === "Low", '<code>sequentialSizes(1)</code> should return "Low"');
   - text: <code>sequentialSizes(2)</code> should return "Low"
-    testString: 'assert(sequentialSizes(2) === "Low", "<code>sequentialSizes(2)</code> should return "Low"");'
+    testString: assert(sequentialSizes(2) === "Low", '<code>sequentialSizes(2)</code> should return "Low"');
   - text: <code>sequentialSizes(3)</code> should return "Low"
-    testString: 'assert(sequentialSizes(3) === "Low", "<code>sequentialSizes(3)</code> should return "Low"");'
+    testString: assert(sequentialSizes(3) === "Low", '<code>sequentialSizes(3)</code> should return "Low"');
   - text: <code>sequentialSizes(4)</code> should return "Mid"
-    testString: 'assert(sequentialSizes(4) === "Mid", "<code>sequentialSizes(4)</code> should return "Mid"");'
+    testString: assert(sequentialSizes(4) === "Mid", '<code>sequentialSizes(4)</code> should return "Mid"');
   - text: <code>sequentialSizes(5)</code> should return "Mid"
-    testString: 'assert(sequentialSizes(5) === "Mid", "<code>sequentialSizes(5)</code> should return "Mid"");'
+    testString: assert(sequentialSizes(5) === "Mid", '<code>sequentialSizes(5)</code> should return "Mid"');
   - text: <code>sequentialSizes(6)</code> should return "Mid"
-    testString: 'assert(sequentialSizes(6) === "Mid", "<code>sequentialSizes(6)</code> should return "Mid"");'
+    testString: assert(sequentialSizes(6) === "Mid", '<code>sequentialSizes(6)</code> should return "Mid"');
   - text: <code>sequentialSizes(7)</code> should return "High"
-    testString: 'assert(sequentialSizes(7) === "High", "<code>sequentialSizes(7)</code> should return "High"");'
+    testString: assert(sequentialSizes(7) === "High", '<code>sequentialSizes(7)</code> should return "High"');
   - text: <code>sequentialSizes(8)</code> should return "High"
-    testString: 'assert(sequentialSizes(8) === "High", "<code>sequentialSizes(8)</code> should return "High"");'
+    testString: assert(sequentialSizes(8) === "High", '<code>sequentialSizes(8)</code> should return "High"');
   - text: <code>sequentialSizes(9)</code> should return "High"
-    testString: 'assert(sequentialSizes(9) === "High", "<code>sequentialSizes(9)</code> should return "High"");'
+    testString: assert(sequentialSizes(9) === "High", '<code>sequentialSizes(9)</code> should return "High"');
   - text: You should not use any <code>if</code> or <code>else</code> statements
-    testString: 'assert(!/else/g.test(code) || !/if/g.test(code), "You should not use any <code>if</code> or <code>else</code> statements");'
+    testString: assert(!/else/g.test(code) || !/if/g.test(code), 'You should not use any <code>if</code> or <code>else</code> statements');
   - text: You should have nine <code>case</code> statements
-    testString: 'assert(code.match(/case/g).length === 9, "You should have nine <code>case</code> statements");'
+    testString: assert(code.match(/case/g).length === 9, 'You should have nine <code>case</code> statements');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-decimals-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-decimals-with-javascript.english.md
index b18bd52483..d8fc125c82 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-decimals-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-decimals-with-javascript.english.md
@@ -21,9 +21,9 @@ Change the <code>0.0</code> so that product will equal <code>5.0</code>.
 ```yml
 tests:
   - text: The variable <code>product</code> should equal <code>5.0</code>.
-    testString: 'assert(product === 5.0, "The variable <code>product</code> should equal <code>5.0</code>.");'
+    testString: assert(product === 5.0, 'The variable <code>product</code> should equal <code>5.0</code>.');
   - text: You should use the <code>*</code> operator
-    testString: 'assert(/\*/.test(code), "You should use the <code>*</code> operator");'
+    testString: assert(/\*/.test(code), 'You should use the <code>*</code> operator');
 
 ```
 
@@ -47,7 +47,7 @@ var product = 2.0 * 0.0;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(y){return 'product = '+y;})(product);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-numbers-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-numbers-with-javascript.english.md
index 4cc05a35fe..ea5674cef2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-numbers-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/multiply-two-numbers-with-javascript.english.md
@@ -25,9 +25,9 @@ Change the <code>0</code> so that product will equal <code>80</code>.
 ```yml
 tests:
   - text: Make the variable <code>product</code> equal 80
-    testString: 'assert(product === 80,"Make the variable <code>product</code> equal 80");'
+    testString: assert(product === 80,'Make the variable <code>product</code> equal 80');
   - text: Use the <code>*</code> operator
-    testString: 'assert(/\*/.test(code), "Use the <code>*</code> operator");'
+    testString: assert(/\*/.test(code), 'Use the <code>*</code> operator');
 
 ```
 
@@ -51,7 +51,7 @@ var product = 8 * 0;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'product = '+z;})(product);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nest-one-array-within-another-array.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nest-one-array-within-another-array.english.md
index 7adaaca79b..3fe65e7487 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nest-one-array-within-another-array.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nest-one-array-within-another-array.english.md
@@ -20,7 +20,7 @@ Create a nested array called <code>myArray</code>.
 ```yml
 tests:
   - text: <code>myArray</code> should have at least one array nested within another array.
-    testString: 'assert(Array.isArray(myArray) && myArray.some(Array.isArray), "<code>myArray</code> should have at least one array nested within another array.");'
+    testString: assert(Array.isArray(myArray) && myArray.some(Array.isArray), '<code>myArray</code> should have at least one array nested within another array.');
 
 ```
 
@@ -47,7 +47,7 @@ var myArray = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+if(typeof myArray !== "undefined"){(function(){return myArray;})();}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nesting-for-loops.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nesting-for-loops.english.md
index fee1ba41c7..6d33b32b0b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nesting-for-loops.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/nesting-for-loops.english.md
@@ -21,12 +21,12 @@ Modify function <code>multiplyAll</code> so that it multiplies the <code>product
 
 ```yml
 tests:
-  - text: '<code>multiplyAll([[1],[2],[3]])</code> should return <code>6</code>'
-    testString: 'assert(multiplyAll([[1],[2],[3]]) === 6, "<code>multiplyAll([[1],[2],[3]])</code> should return <code>6</code>");'
-  - text: '<code>multiplyAll([[1,2],[3,4],[5,6,7]])</code> should return <code>5040</code>'
-    testString: 'assert(multiplyAll([[1,2],[3,4],[5,6,7]]) === 5040, "<code>multiplyAll([[1,2],[3,4],[5,6,7]])</code> should return <code>5040</code>");'
-  - text: '<code>multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])</code> should return <code>54</code>'
-    testString: 'assert(multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]]) === 54, "<code>multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])</code> should return <code>54</code>");'
+  - text: <code>multiplyAll([[1],[2],[3]])</code> should return <code>6</code>
+    testString: assert(multiplyAll([[1],[2],[3]]) === 6, '<code>multiplyAll([[1],[2],[3]])</code> should return <code>6</code>');
+  - text: <code>multiplyAll([[1,2],[3,4],[5,6,7]])</code> should return <code>5040</code>
+    testString: assert(multiplyAll([[1,2],[3,4],[5,6,7]]) === 5040, '<code>multiplyAll([[1,2],[3,4],[5,6,7]])</code> should return <code>5040</code>');
+  - text: <code>multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])</code> should return <code>54</code>
+    testString: assert(multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]]) === 54, '<code>multiplyAll([[5,1],[0.2, 4, 0.5],[3, 9]])</code> should return <code>54</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/passing-values-to-functions-with-arguments.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/passing-values-to-functions-with-arguments.english.md
index ff34591987..a8b4cf26da 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/passing-values-to-functions-with-arguments.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/passing-values-to-functions-with-arguments.english.md
@@ -25,13 +25,13 @@ We have passed two arguments, <code>"Hello"</code> and <code>"World"</code>. Ins
 ```yml
 tests:
   - text: <code>functionWithArgs</code> should be a function
-    testString: 'assert(typeof functionWithArgs === "function", "<code>functionWithArgs</code> should be a function");'
-  - text: '<code>functionWithArgs(1,2)</code> should output <code>3</code>'
-    testString: 'if(typeof functionWithArgs === "function") { capture(); functionWithArgs(1,2); uncapture(); } assert(logOutput == 3, "<code>functionWithArgs(1,2)</code> should output <code>3</code>");'
-  - text: '<code>functionWithArgs(7,9)</code> should output <code>16</code>'
-    testString: 'if(typeof functionWithArgs === "function") { capture(); functionWithArgs(7,9); uncapture(); } assert(logOutput == 16, "<code>functionWithArgs(7,9)</code> should output <code>16</code>");'
+    testString: assert(typeof functionWithArgs === 'function', '<code>functionWithArgs</code> should be a function');
+  - text: <code>functionWithArgs(1,2)</code> should output <code>3</code>
+    testString: if(typeof functionWithArgs === "function") { capture(); functionWithArgs(1,2); uncapture(); } assert(logOutput == 3, '<code>functionWithArgs(1,2)</code> should output <code>3</code>');
+  - text: <code>functionWithArgs(7,9)</code> should output <code>16</code>
+    testString: if(typeof functionWithArgs === "function") { capture(); functionWithArgs(7,9); uncapture(); } assert(logOutput == 16, '<code>functionWithArgs(7,9)</code> should output <code>16</code>');
   - text: Call <code>functionWithArgs</code> with two numbers after you define it.
-    testString: 'assert(/^\s*functionWithArgs\s*\(\s*\d+\s*,\s*\d+\s*\)\s*;/m.test(code), "Call <code>functionWithArgs</code> with two numbers after you define it.");'
+    testString: assert(/^\s*functionWithArgs\s*\(\s*\d+\s*,\s*\d+\s*\)\s*;/m.test(code), 'Call <code>functionWithArgs</code> with two numbers after you define it.');
 
 ```
 
@@ -88,7 +88,13 @@ capture();
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+uncapture();
+
+if (typeof functionWithArgs !== "function") { 
+  (function() { return "functionWithArgs is not defined"; })();
+} else {
+  (function() { return logOutput || "console.log never called"; })();
+}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/practice-comparing-different-values.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/practice-comparing-different-values.english.md
index 336112858a..1842cb2272 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/practice-comparing-different-values.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/practice-comparing-different-values.english.md
@@ -24,12 +24,12 @@ The <code>compareEquality</code> function in the editor compares two values usin
 
 ```yml
 tests:
-  - text: '<code>compareEquality(10, "10")</code> should return "Not Equal"'
-    testString: 'assert(compareEquality(10, "10") === "Not Equal", "<code>compareEquality(10, "10")</code> should return "Not Equal"");'
-  - text: '<code>compareEquality("20", 20)</code> should return "Not Equal"'
-    testString: 'assert(compareEquality("20", 20) === "Not Equal", "<code>compareEquality("20", 20)</code> should return "Not Equal"");'
+  - text: <code>compareEquality(10, "10")</code> should return "Not Equal"
+    testString: assert(compareEquality(10, "10") === "Not Equal", '<code>compareEquality(10, "10")</code> should return "Not Equal"');
+  - text: <code>compareEquality("20", 20)</code> should return "Not Equal"
+    testString: assert(compareEquality("20", 20) === "Not Equal", '<code>compareEquality("20", 20)</code> should return "Not Equal"');
   - text: You should use the <code>===</code> operator
-    testString: 'assert(code.match(/===/g), "You should use the <code>===</code> operator");'
+    testString: assert(code.match(/===/g), 'You should use the <code>===</code> operator');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/profile-lookup.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/profile-lookup.english.md
index 1c117a0d46..235dd20cbb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/profile-lookup.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/profile-lookup.english.md
@@ -24,18 +24,18 @@ If <code>prop</code> does not correspond to any valid properties of a contact fo
 
 ```yml
 tests:
-  - text: '<code>"Kristian", "lastName"</code> should return <code>"Vos"</code>'
-    testString: 'assert(lookUpProfile("Kristian","lastName") === "Vos", "<code>"Kristian", "lastName"</code> should return <code>"Vos"</code>");'
-  - text: '<code>"Sherlock", "likes"</code> should return <code>["Intriguing Cases", "Violin"]</code>'
-    testString: 'assert.deepEqual(lookUpProfile("Sherlock", "likes"), ["Intriguing Cases", "Violin"], "<code>"Sherlock", "likes"</code> should return <code>["Intriguing Cases", "Violin"]</code>");'
-  - text: '<code>"Harry","likes"</code> should return an array'
-    testString: 'assert(typeof lookUpProfile("Harry", "likes") === "object", "<code>"Harry","likes"</code> should return an array");'
-  - text: '<code>"Bob", "number"</code> should return "No such contact"'
-    testString: 'assert(lookUpProfile("Bob", "number") === "No such contact", "<code>"Bob", "number"</code> should return "No such contact"");'
-  - text: '<code>"Bob", "potato"</code> should return "No such contact"'
-    testString: 'assert(lookUpProfile("Bob", "potato") === "No such contact", "<code>"Bob", "potato"</code> should return "No such contact"");'
-  - text: '<code>"Akira", "address"</code> should return "No such property"'
-    testString: 'assert(lookUpProfile("Akira", "address") === "No such property", "<code>"Akira", "address"</code> should return "No such property"");'
+  - text: <code>"Kristian", "lastName"</code> should return <code>"Vos"</code>
+    testString: assert(lookUpProfile('Kristian','lastName') === "Vos", '<code>"Kristian", "lastName"</code> should return <code>"Vos"</code>');
+  - text: <code>"Sherlock", "likes"</code> should return <code>["Intriguing Cases", "Violin"]</code>
+    testString: assert.deepEqual(lookUpProfile("Sherlock", "likes"), ["Intriguing Cases", "Violin"], '<code>"Sherlock", "likes"</code> should return <code>["Intriguing Cases", "Violin"]</code>');
+  - text: <code>"Harry","likes"</code> should return an array
+    testString: assert(typeof lookUpProfile("Harry", "likes") === "object", '<code>"Harry","likes"</code> should return an array');
+  - text: <code>"Bob", "number"</code> should return "No such contact"
+    testString: assert(lookUpProfile("Bob", "number") === "No such contact", '<code>"Bob", "number"</code> should return "No such contact"');
+  - text: <code>"Bob", "potato"</code> should return "No such contact"
+    testString: assert(lookUpProfile("Bob", "potato") === "No such contact", '<code>"Bob", "potato"</code> should return "No such contact"');
+  - text: <code>"Akira", "address"</code> should return "No such property"
+    testString: assert(lookUpProfile("Akira", "address") === "No such property", '<code>"Akira", "address"</code> should return "No such property"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/quoting-strings-with-single-quotes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/quoting-strings-with-single-quotes.english.md
index 91c76b2717..b5e9b492ad 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/quoting-strings-with-single-quotes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/quoting-strings-with-single-quotes.english.md
@@ -28,9 +28,9 @@ Right now, the <code>&#60;a&#62;</code> tag in the string uses double quotes eve
 ```yml
 tests:
   - text: Remove all the <code>backslashes</code> (<code>\</code>)
-    testString: 'assert(!/\\/g.test(code) && myStr.match("\\s*<a href\\s*=\\s*"http://www.example.com"\\s*target\\s*=\\s*"_blank">\\s*Link\\s*</a>\\s*"), "Remove all the <code>backslashes</code> (<code>\</code>)");'
-  - text: 'You should have two single quotes <code>&#39;</code> and four double quotes <code>&quot;</code>'
-    testString: 'assert(code.match(/"/g).length === 4 && code.match(/"/g).length === 2, "You should have two single quotes <code>&#39;</code> and four double quotes <code>&quot;</code>");'
+    testString: assert(!/\\/g.test(code) && myStr.match('\\s*<a href\\s*=\\s*"http://www.example.com"\\s*target\\s*=\\s*"_blank">\\s*Link\\s*</a>\\s*'), 'Remove all the <code>backslashes</code> (<code>\</code>)');
+  - text: You should have two single quotes <code>&#39;</code> and four double quotes <code>&quot;</code>
+    testString: assert(code.match(/"/g).length === 4 && code.match(/'/g).length === 2, 'You should have two single quotes <code>&#39;</code> and four double quotes <code>&quot;</code>');
 
 ```
 
@@ -54,7 +54,7 @@ var myStr = "<a href=\"http://www.example.com\" target=\"_blank\">Link</a>";
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function() { return "myStr = " + myStr; })();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.english.md
index c62f78b9ff..6caf166459 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/record-collection.english.md
@@ -29,20 +29,20 @@ You may refer back to <a href="javascript-algorithms-and-data-structures/basic-j
 
 ```yml
 tests:
-  - text: 'After <code>updateRecords(5439, "artist", "ABBA")</code>, <code>artist</code> should be <code>"ABBA"</code>'
-    testString: 'collection = collectionCopy; assert(updateRecords(5439, "artist", "ABBA")[5439]["artist"] === "ABBA", "After <code>updateRecords(5439, "artist", "ABBA")</code>, <code>artist</code> should be <code>"ABBA"</code>");'
-  - text: 'After <code>updateRecords(5439, "tracks", "Take a Chance on Me")</code>, <code>tracks</code> should have <code>"Take a Chance on Me"</code> as the last element.'
-    testString: 'assert(updateRecords(5439, "tracks", "Take a Chance on Me")[5439]["tracks"].pop() === "Take a Chance on Me", "After <code>updateRecords(5439, "tracks", "Take a Chance on Me")</code>, <code>tracks</code> should have <code>"Take a Chance on Me"</code> as the last element.");'
-  - text: 'After <code>updateRecords(2548, "artist", "")</code>, <code>artist</code> should not be set'
-    testString: 'updateRecords(2548, "artist", ""); assert(!collection[2548].hasOwnProperty("artist"), "After <code>updateRecords(2548, "artist", "")</code>, <code>artist</code> should not be set");'
-  - text: 'After <code>updateRecords(1245, "tracks", "Addicted to Love")</code>, <code>tracks</code> should have <code>"Addicted to Love"</code> as the last element.'
-    testString: 'assert(updateRecords(1245, "tracks", "Addicted to Love")[1245]["tracks"].pop() === "Addicted to Love", "After <code>updateRecords(1245, "tracks", "Addicted to Love")</code>, <code>tracks</code> should have <code>"Addicted to Love"</code> as the last element.");'
-  - text: 'After <code>updateRecords(2468, "tracks", "Free")</code>, <code>tracks</code> should have <code>"1999"</code> as the first element.'
-    testString: 'assert(updateRecords(2468, "tracks", "Free")[2468]["tracks"][0] === "1999", "After <code>updateRecords(2468, "tracks", "Free")</code>, <code>tracks</code> should have <code>"1999"</code> as the first element.");'
-  - text: 'After <code>updateRecords(2548, "tracks", "")</code>, <code>tracks</code> should not be set'
-    testString: 'updateRecords(2548, "tracks", ""); assert(!collection[2548].hasOwnProperty("tracks"), "After <code>updateRecords(2548, "tracks", "")</code>, <code>tracks</code> should not be set");'
-  - text: 'After <code>updateRecords(1245, "album", "Riptide")</code>, <code>album</code> should be <code>"Riptide"</code>'
-    testString: 'assert(updateRecords(1245, "album", "Riptide")[1245]["album"] === "Riptide", "After <code>updateRecords(1245, "album", "Riptide")</code>, <code>album</code> should be <code>"Riptide"</code>");'
+  - text: After <code>updateRecords(5439, "artist", "ABBA")</code>, <code>artist</code> should be <code>"ABBA"</code>
+    testString: collection = collectionCopy; assert(updateRecords(5439, "artist", "ABBA")[5439]["artist"] === "ABBA", 'After <code>updateRecords(5439, "artist", "ABBA")</code>, <code>artist</code> should be <code>"ABBA"</code>');
+  - text: After <code>updateRecords(5439, "tracks", "Take a Chance on Me")</code>, <code>tracks</code> should have <code>"Take a Chance on Me"</code> as the last element.
+    testString: assert(updateRecords(5439, "tracks", "Take a Chance on Me")[5439]["tracks"].pop() === "Take a Chance on Me", 'After <code>updateRecords(5439, "tracks", "Take a Chance on Me")</code>, <code>tracks</code> should have <code>"Take a Chance on Me"</code> as the last element.');
+  - text: After <code>updateRecords(2548, "artist", "")</code>, <code>artist</code> should not be set
+    testString: updateRecords(2548, "artist", ""); assert(!collection[2548].hasOwnProperty("artist"), 'After <code>updateRecords(2548, "artist", "")</code>, <code>artist</code> should not be set');
+  - text: After <code>updateRecords(1245, "tracks", "Addicted to Love")</code>, <code>tracks</code> should have <code>"Addicted to Love"</code> as the last element.
+    testString: assert(updateRecords(1245, "tracks", "Addicted to Love")[1245]["tracks"].pop() === "Addicted to Love", 'After <code>updateRecords(1245, "tracks", "Addicted to Love")</code>, <code>tracks</code> should have <code>"Addicted to Love"</code> as the last element.');
+  - text: After <code>updateRecords(2468, "tracks", "Free")</code>, <code>tracks</code> should have <code>"1999"</code> as the first element.
+    testString: assert(updateRecords(2468, "tracks", "Free")[2468]["tracks"][0] === "1999", 'After <code>updateRecords(2468, "tracks", "Free")</code>, <code>tracks</code> should have <code>"1999"</code> as the first element.');
+  - text: After <code>updateRecords(2548, "tracks", "")</code>, <code>tracks</code> should not be set
+    testString: updateRecords(2548, "tracks", ""); assert(!collection[2548].hasOwnProperty("tracks"), 'After <code>updateRecords(2548, "tracks", "")</code>, <code>tracks</code> should not be set');
+  - text: After <code>updateRecords(1245, "album", "Riptide")</code>, <code>album</code> should be <code>"Riptide"</code>
+    testString: assert(updateRecords(1245, "album", "Riptide")[1245]["album"] === "Riptide", 'After <code>updateRecords(1245, "album", "Riptide")</code>, <code>album</code> should be <code>"Riptide"</code>');
 
 ```
 
@@ -102,7 +102,7 @@ updateRecords(5439, "artist", "ABBA");
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+;(function(x) { return "collection = \n" + JSON.stringify(x, '\n', 2); })(collection);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/replacing-if-else-chains-with-switch.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/replacing-if-else-chains-with-switch.english.md
index b760d676c8..768f1c7b71 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/replacing-if-else-chains-with-switch.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/replacing-if-else-chains-with-switch.english.md
@@ -23,25 +23,25 @@ Change the chained <code>if</code>/<code>else if</code> statements into a <code>
 ```yml
 tests:
   - text: You should not use any <code>else</code> statements anywhere in the editor
-    testString: 'assert(!/else/g.test(code), "You should not use any <code>else</code> statements anywhere in the editor");'
+    testString: assert(!/else/g.test(code), 'You should not use any <code>else</code> statements anywhere in the editor');
   - text: You should not use any <code>if</code> statements anywhere in the editor
-    testString: 'assert(!/if/g.test(code), "You should not use any <code>if</code> statements anywhere in the editor");'
+    testString: assert(!/if/g.test(code), 'You should not use any <code>if</code> statements anywhere in the editor');
   - text: You should have at least four <code>break</code> statements
-    testString: 'assert(code.match(/break/g).length >= 4, "You should have at least four <code>break</code> statements");'
+    testString: assert(code.match(/break/g).length >= 4, 'You should have at least four <code>break</code> statements');
   - text: <code>chainToSwitch("bob")</code> should be "Marley"
-    testString: 'assert(chainToSwitch("bob") === "Marley", "<code>chainToSwitch("bob")</code> should be "Marley"");'
+    testString: assert(chainToSwitch("bob") === "Marley", '<code>chainToSwitch("bob")</code> should be "Marley"');
   - text: <code>chainToSwitch(42)</code> should be "The Answer"
-    testString: 'assert(chainToSwitch(42) === "The Answer", "<code>chainToSwitch(42)</code> should be "The Answer"");'
-  - text: '<code>chainToSwitch(1)</code> should be "There is no #1"'
-    testString: 'assert(chainToSwitch(1) === "There is no #1", "<code>chainToSwitch(1)</code> should be "There is no #1"");'
+    testString: assert(chainToSwitch(42) === "The Answer", '<code>chainToSwitch(42)</code> should be "The Answer"');
+  - text: "<code>chainToSwitch(1)</code> should be \"There is no #1\""
+    testString: "assert(chainToSwitch(1) === \"There is no #1\", '<code>chainToSwitch(1)</code> should be \"There is no #1\"');"
   - text: <code>chainToSwitch(99)</code> should be "Missed me by this much!"
-    testString: 'assert(chainToSwitch(99) === "Missed me by this much!", "<code>chainToSwitch(99)</code> should be "Missed me by this much!"");'
+    testString: assert(chainToSwitch(99) === "Missed me by this much!", '<code>chainToSwitch(99)</code> should be "Missed me by this much!"');
   - text: <code>chainToSwitch(7)</code> should be "Ate Nine"
-    testString: 'assert(chainToSwitch(7) === "Ate Nine", "<code>chainToSwitch(7)</code> should be "Ate Nine"");'
+    testString: assert(chainToSwitch(7) === "Ate Nine", '<code>chainToSwitch(7)</code> should be "Ate Nine"');
   - text: <code>chainToSwitch("John")</code> should be "" (empty string)
-    testString: 'assert(chainToSwitch("John") === "", "<code>chainToSwitch("John")</code> should be "" (empty string)");'
+    testString: assert(chainToSwitch("John") === "", '<code>chainToSwitch("John")</code> should be "" (empty string)');
   - text: <code>chainToSwitch(156)</code> should be "" (empty string)
-    testString: 'assert(chainToSwitch(156) === "", "<code>chainToSwitch(156)</code> should be "" (empty string)");'
+    testString: assert(chainToSwitch(156) === "", '<code>chainToSwitch(156)</code> should be "" (empty string)');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-a-value-from-a-function-with-return.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-a-value-from-a-function-with-return.english.md
index 607a07e523..0eb6555e9c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-a-value-from-a-function-with-return.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-a-value-from-a-function-with-return.english.md
@@ -23,13 +23,13 @@ Create a function <code>timesFive</code> that accepts one argument, multiplies i
 ```yml
 tests:
   - text: <code>timesFive</code> should be a function
-    testString: 'assert(typeof timesFive === "function", "<code>timesFive</code> should be a function");'
+    testString: assert(typeof timesFive === 'function', '<code>timesFive</code> should be a function');
   - text: <code>timesFive(5)</code> should return <code>25</code>
-    testString: 'assert(timesFive(5) === 25, "<code>timesFive(5)</code> should return <code>25</code>");'
+    testString: assert(timesFive(5) === 25, '<code>timesFive(5)</code> should return <code>25</code>');
   - text: <code>timesFive(2)</code> should return <code>10</code>
-    testString: 'assert(timesFive(2) === 10, "<code>timesFive(2)</code> should return <code>10</code>");'
+    testString: assert(timesFive(2) === 10, '<code>timesFive(2)</code> should return <code>10</code>');
   - text: <code>timesFive(0)</code> should return <code>0</code>
-    testString: 'assert(timesFive(0) === 0, "<code>timesFive(0)</code> should return <code>0</code>");'
+    testString: assert(timesFive(0) === 0, '<code>timesFive(0)</code> should return <code>0</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-early-pattern-for-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-early-pattern-for-functions.english.md
index c7130c53fc..7ee31649f2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-early-pattern-for-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-early-pattern-for-functions.english.md
@@ -23,18 +23,18 @@ Modify the function <code>abTest</code> so that if <code>a</code> or <code>b</co
 
 ```yml
 tests:
-  - text: '<code>abTest(2,2)</code> should return a number'
-    testString: 'assert(typeof abTest(2,2) === "number" , "<code>abTest(2,2)</code> should return a number");'
-  - text: '<code>abTest(2,2)</code> should return <code>8</code>'
-    testString: 'assert(abTest(2,2) === 8 , "<code>abTest(2,2)</code> should return <code>8</code>");'
-  - text: '<code>abTest(-2,2)</code> should return <code>undefined</code>'
-    testString: 'assert(abTest(-2,2) === undefined , "<code>abTest(-2,2)</code> should return <code>undefined</code>");'
-  - text: '<code>abTest(2,-2)</code> should return <code>undefined</code>'
-    testString: 'assert(abTest(2,-2) === undefined , "<code>abTest(2,-2)</code> should return <code>undefined</code>");'
-  - text: '<code>abTest(2,8)</code> should return <code>18</code>'
-    testString: 'assert(abTest(2,8) === 18 , "<code>abTest(2,8)</code> should return <code>18</code>");'
-  - text: '<code>abTest(3,3)</code> should return <code>12</code>'
-    testString: 'assert(abTest(3,3) === 12 , "<code>abTest(3,3)</code> should return <code>12</code>");'
+  - text: <code>abTest(2,2)</code> should return a number
+    testString: assert(typeof abTest(2,2) === 'number' , '<code>abTest(2,2)</code> should return a number');
+  - text: <code>abTest(2,2)</code> should return <code>8</code>
+    testString: assert(abTest(2,2) === 8 , '<code>abTest(2,2)</code> should return <code>8</code>');
+  - text: <code>abTest(-2,2)</code> should return <code>undefined</code>
+    testString: assert(abTest(-2,2) === undefined , '<code>abTest(-2,2)</code> should return <code>undefined</code>');
+  - text: <code>abTest(2,-2)</code> should return <code>undefined</code>
+    testString: assert(abTest(2,-2) === undefined , '<code>abTest(2,-2)</code> should return <code>undefined</code>');
+  - text: <code>abTest(2,8)</code> should return <code>18</code>
+    testString: assert(abTest(2,8) === 18 , '<code>abTest(2,8)</code> should return <code>18</code>');
+  - text: <code>abTest(3,3)</code> should return <code>12</code>
+    testString: assert(abTest(3,3) === 12 , '<code>abTest(3,3)</code> should return <code>12</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/returning-boolean-values-from-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/returning-boolean-values-from-functions.english.md
index 31abe6e13c..e7b401d71d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/returning-boolean-values-from-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/returning-boolean-values-from-functions.english.md
@@ -23,12 +23,12 @@ Fix the function <code>isLess</code> to remove the <code>if/else</code> statemen
 
 ```yml
 tests:
-  - text: '<code>isLess(10,15)</code> should return <code>true</code>'
-    testString: 'assert(isLess(10,15) === true, "<code>isLess(10,15)</code> should return <code>true</code>");'
-  - text: '<code>isLess(15,10)</code> should return <code>false</code>'
-    testString: 'assert(isLess(15, 10) === false, "<code>isLess(15,10)</code> should return <code>false</code>");'
+  - text: <code>isLess(10,15)</code> should return <code>true</code>
+    testString: assert(isLess(10,15) === true, '<code>isLess(10,15)</code> should return <code>true</code>');
+  - text: <code>isLess(15,10)</code> should return <code>false</code>
+    testString: assert(isLess(15, 10) === false, '<code>isLess(15,10)</code> should return <code>false</code>');
   - text: You should not use any <code>if</code> or <code>else</code> statements
-    testString: 'assert(!/if|else/g.test(code), "You should not use any <code>if</code> or <code>else</code> statements");'
+    testString: assert(!/if|else/g.test(code), 'You should not use any <code>if</code> or <code>else</code> statements');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/selecting-from-many-options-with-switch-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/selecting-from-many-options-with-switch-statements.english.md
index cc33e3b784..47244616b9 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/selecting-from-many-options-with-switch-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/selecting-from-many-options-with-switch-statements.english.md
@@ -23,17 +23,17 @@ Write a switch statement which tests <code>val</code> and sets <code>answer</cod
 ```yml
 tests:
   - text: <code>caseInSwitch(1)</code> should have a value of "alpha"
-    testString: 'assert(caseInSwitch(1) === "alpha", "<code>caseInSwitch(1)</code> should have a value of "alpha"");'
+    testString: assert(caseInSwitch(1) === "alpha", '<code>caseInSwitch(1)</code> should have a value of "alpha"');
   - text: <code>caseInSwitch(2)</code> should have a value of "beta"
-    testString: 'assert(caseInSwitch(2) === "beta", "<code>caseInSwitch(2)</code> should have a value of "beta"");'
+    testString: assert(caseInSwitch(2) === "beta", '<code>caseInSwitch(2)</code> should have a value of "beta"');
   - text: <code>caseInSwitch(3)</code> should have a value of "gamma"
-    testString: 'assert(caseInSwitch(3) === "gamma", "<code>caseInSwitch(3)</code> should have a value of "gamma"");'
+    testString: assert(caseInSwitch(3) === "gamma", '<code>caseInSwitch(3)</code> should have a value of "gamma"');
   - text: <code>caseInSwitch(4)</code> should have a value of "delta"
-    testString: 'assert(caseInSwitch(4) === "delta", "<code>caseInSwitch(4)</code> should have a value of "delta"");'
+    testString: assert(caseInSwitch(4) === "delta", '<code>caseInSwitch(4)</code> should have a value of "delta"');
   - text: You should not use any <code>if</code> or <code>else</code> statements
-    testString: 'assert(!/else/g.test(code) || !/if/g.test(code), "You should not use any <code>if</code> or <code>else</code> statements");'
+    testString: assert(!/else/g.test(code) || !/if/g.test(code), 'You should not use any <code>if</code> or <code>else</code> statements');
   - text: You should have at least 3 <code>break</code> statements
-    testString: 'assert(code.match(/break/g).length > 2, "You should have at least 3 <code>break</code> statements");'
+    testString: assert(code.match(/break/g).length > 2, 'You should have at least 3 <code>break</code> statements');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/shopping-list.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/shopping-list.english.md
index 87c67adf62..b9ff19c25c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/shopping-list.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/shopping-list.english.md
@@ -23,13 +23,13 @@ There should be at least 5 sub-arrays in the list.
 ```yml
 tests:
   - text: <code>myList</code> should be an array
-    testString: 'assert(isArray, "<code>myList</code> should be an array");'
+    testString: assert(isArray, '<code>myList</code> should be an array');
   - text: The first elements in each of your sub-arrays must all be strings
-    testString: 'assert(hasString, "The first elements in each of your sub-arrays must all be strings");'
+    testString: assert(hasString, 'The first elements in each of your sub-arrays must all be strings');
   - text: The second elements in each of your sub-arrays must all be numbers
-    testString: 'assert(hasNumber, "The second elements in each of your sub-arrays must all be numbers");'
+    testString: assert(hasNumber, 'The second elements in each of your sub-arrays must all be numbers');
   - text: You must have at least 5 items in your list
-    testString: 'assert(count > 4, "You must have at least 5 items in your list");'
+    testString: assert(count > 4, 'You must have at least 5 items in your list');
 
 ```
 
@@ -53,7 +53,32 @@ var myList = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+var count = 0;
+var isArray = false;
+var hasString = false;
+var hasNumber = false;
+(function(list){
+  if(Array.isArray(myList)) {
+    isArray = true;
+    if(myList.length > 0) {
+      hasString = true;
+      hasNumber = true;
+      myList.forEach(function(elem) {
+        if(typeof elem[0] !== 'string') {
+          hasString = false;
+        }
+        if(typeof elem[1] !== 'number') {
+          hasNumber = false;
+        }
+      });
+    }
+    count = myList.length;
+    return JSON.stringify(myList);
+  } else {
+    return "myList is not an array";
+  }
+
+})(myList);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/stand-in-line.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/stand-in-line.english.md
index b1d7cd757c..8d336820cd 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/stand-in-line.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/stand-in-line.english.md
@@ -22,16 +22,16 @@ The <code>nextInLine</code> function should then return the element that was rem
 
 ```yml
 tests:
-  - text: '<code>nextInLine([], 5)</code> should return a number.'
-    testString: 'assert.isNumber(nextInLine([],5), "<code>nextInLine([], 5)</code> should return a number.");'
-  - text: '<code>nextInLine([], 1)</code> should return <code>1</code>'
-    testString: 'assert(nextInLine([],1) === 1, "<code>nextInLine([], 1)</code> should return <code>1</code>");'
-  - text: '<code>nextInLine([2], 1)</code> should return <code>2</code>'
-    testString: 'assert(nextInLine([2],1) === 2, "<code>nextInLine([2], 1)</code> should return <code>2</code>");'
-  - text: '<code>nextInLine([5,6,7,8,9], 1)</code> should return <code>5</code>'
-    testString: 'assert(nextInLine([5,6,7,8,9],1) === 5, "<code>nextInLine([5,6,7,8,9], 1)</code> should return <code>5</code>");'
-  - text: 'After <code>nextInLine(testArr, 10)</code>, <code>testArr[4]</code> should be <code>10</code>'
-    testString: 'nextInLine(testArr, 10); assert(testArr[4] === 10, "After <code>nextInLine(testArr, 10)</code>, <code>testArr[4]</code> should be <code>10</code>");'
+  - text: <code>nextInLine([], 5)</code> should return a number.
+    testString: assert.isNumber(nextInLine([],5), '<code>nextInLine([], 5)</code> should return a number.');
+  - text: <code>nextInLine([], 1)</code> should return <code>1</code>
+    testString: assert(nextInLine([],1) === 1, '<code>nextInLine([], 1)</code> should return <code>1</code>');
+  - text: <code>nextInLine([2], 1)</code> should return <code>2</code>
+    testString: assert(nextInLine([2],1) === 2, '<code>nextInLine([2], 1)</code> should return <code>2</code>');
+  - text: <code>nextInLine([5,6,7,8,9], 1)</code> should return <code>5</code>
+    testString: assert(nextInLine([5,6,7,8,9],1) === 5, '<code>nextInLine([5,6,7,8,9], 1)</code> should return <code>5</code>');
+  - text: After <code>nextInLine(testArr, 10)</code>, <code>testArr[4]</code> should be <code>10</code>
+    testString: nextInLine(testArr, 10); assert(testArr[4] === 10, 'After <code>nextInLine(testArr, 10)</code>, <code>testArr[4]</code> should be <code>10</code>');
 
 ```
 
@@ -92,7 +92,9 @@ capture();
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+uncapture();
+testArr = [1,2,3,4,5];
+(function() { return logOutput.join("\n");})();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/store-multiple-values-in-one-variable-using-javascript-arrays.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/store-multiple-values-in-one-variable-using-javascript-arrays.english.md
index 3b28781404..4c99cd8f4b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/store-multiple-values-in-one-variable-using-javascript-arrays.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/store-multiple-values-in-one-variable-using-javascript-arrays.english.md
@@ -23,11 +23,11 @@ Modify the new array <code>myArray</code> so that it contains both a <code>strin
 ```yml
 tests:
   - text: <code>myArray</code> should be an <code>array</code>.
-    testString: 'assert(typeof myArray == "object", "<code>myArray</code> should be an <code>array</code>.");'
+    testString: assert(typeof myArray == 'object', '<code>myArray</code> should be an <code>array</code>.');
   - text: The first item in <code>myArray</code> should be a <code>string</code>.
-    testString: 'assert(typeof myArray[0] !== "undefined" && typeof myArray[0] == "string", "The first item in <code>myArray</code> should be a <code>string</code>.");'
+    testString: assert(typeof myArray[0] !== 'undefined' && typeof myArray[0] == 'string', 'The first item in <code>myArray</code> should be a <code>string</code>.');
   - text: The second item in <code>myArray</code> should be a <code>number</code>.
-    testString: 'assert(typeof myArray[1] !== "undefined" && typeof myArray[1] == "number", "The second item in <code>myArray</code> should be a <code>number</code>.");'
+    testString: assert(typeof myArray[1] !== 'undefined' && typeof myArray[1] == 'number', 'The second item in <code>myArray</code> should be a <code>number</code>.');
 
 ```
 
@@ -54,7 +54,7 @@ var myArray = [];
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return z;})(myArray);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/storing-values-with-the-assignment-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/storing-values-with-the-assignment-operator.english.md
index 4d36e20bcb..2cd21310a2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/storing-values-with-the-assignment-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/storing-values-with-the-assignment-operator.english.md
@@ -26,13 +26,13 @@ Assign the contents of <code>a</code> to variable <code>b</code>.
 ```yml
 tests:
   - text: Do not change code above the line
-    testString: 'assert(/var a;/.test(code) && /var b = 2;/.test(code), "Do not change code above the line");'
+    testString: assert(/var a;/.test(code) && /var b = 2;/.test(code), 'Do not change code above the line');
   - text: <code>a</code> should have a value of 7
-    testString: 'assert(typeof a === "number" && a === 7, "<code>a</code> should have a value of 7");'
+    testString: assert(typeof a === 'number' && a === 7, '<code>a</code> should have a value of 7');
   - text: <code>b</code> should have a value of 7
-    testString: 'assert(typeof b === "number" && b === 7, "<code>b</code> should have a value of 7");'
+    testString: assert(typeof b === 'number' && b === 7, '<code>b</code> should have a value of 7');
   - text: <code>a</code> should be assigned to <code>b</code> with <code>=</code>
-    testString: 'assert(/b\s*=\s*a\s*;/g.test(code), "<code>a</code> should be assigned to <code>b</code> with <code>=</code>");'
+    testString: assert(/b\s*=\s*a\s*;/g.test(code), '<code>a</code> should be assigned to <code>b</code> with <code>=</code>');
 
 ```
 
@@ -72,7 +72,7 @@ if (typeof b != 'undefined') {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b){return "a = " + a + ", b = " + b;})(a,b);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.english.md
index 42e4812170..01e51c242b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.english.md
@@ -25,9 +25,9 @@ Change the <code>0</code> so the difference is <code>12</code>.
 ```yml
 tests:
   - text: Make the variable <code>difference</code> equal 12.
-    testString: 'assert(difference === 12, "Make the variable <code>difference</code> equal 12.");'
+    testString: assert(difference === 12, 'Make the variable <code>difference</code> equal 12.');
   - text: Only subtract one number from 45.
-    testString: 'assert(/var\s*difference\s*=\s*45\s*-\s*[0-9]*;(?!\s*[a-zA-Z0-9]+)/.test(code),"Only subtract one number from 45.");'
+    testString: assert(/var\s*difference\s*=\s*45\s*-\s*[0-9]*;(?!\s*[a-zA-Z0-9]+)/.test(code),'Only subtract one number from 45.');
 
 ```
 
@@ -51,7 +51,7 @@ var difference = 45 - 0;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return 'difference = '+z;})(difference);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/testing-objects-for-properties.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/testing-objects-for-properties.english.md
index a2466c5b90..99f028da58 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/testing-objects-for-properties.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/testing-objects-for-properties.english.md
@@ -22,11 +22,11 @@ Modify the function <code>checkObj</code> to test <code>myObj</code> for <code>c
 ```yml
 tests:
   - text: <code>checkObj("gift")</code> should return  <code>"pony"</code>.
-    testString: 'assert(checkObj("gift") === "pony", "<code>checkObj("gift")</code> should return  <code>"pony"</code>.");'
+    testString: assert(checkObj("gift") === "pony", '<code>checkObj("gift")</code> should return  <code>"pony"</code>.');
   - text: <code>checkObj("pet")</code> should return  <code>"kitten"</code>.
-    testString: 'assert(checkObj("pet") === "kitten", "<code>checkObj("pet")</code> should return  <code>"kitten"</code>.");'
+    testString: assert(checkObj("pet") === "kitten", '<code>checkObj("pet")</code> should return  <code>"kitten"</code>.');
   - text: <code>checkObj("house")</code> should return  <code>"Not Found"</code>.
-    testString: 'assert(checkObj("house") === "Not Found", "<code>checkObj("house")</code> should return  <code>"Not Found"</code>.");'
+    testString: assert(checkObj("house") === "Not Found", '<code>checkObj("house")</code> should return  <code>"Not Found"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understand-string-immutability.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understand-string-immutability.english.md
index ba02a2691e..be46c667bc 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understand-string-immutability.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understand-string-immutability.english.md
@@ -24,9 +24,9 @@ Correct the assignment to <code>myStr</code> so it contains the string value of
 ```yml
 tests:
   - text: <code>myStr</code> should have a value of <code>Hello World</code>
-    testString: 'assert(myStr === "Hello World", "<code>myStr</code> should have a value of <code>Hello World</code>");'
+    testString: assert(myStr === "Hello World", '<code>myStr</code> should have a value of <code>Hello World</code>');
   - text: Do not change the code above the line
-    testString: 'assert(/myStr = "Jello World"/.test(code), "Do not change the code above the line");'
+    testString: assert(/myStr = "Jello World"/.test(code), 'Do not change the code above the line');
 
 ```
 
@@ -55,7 +55,7 @@ myStr[0] = "H"; // Fix Me
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(v){return "myStr = " + v;})(myStr);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-boolean-values.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-boolean-values.english.md
index ac92c75d49..5e700a5533 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-boolean-values.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-boolean-values.english.md
@@ -20,10 +20,10 @@ Modify the <code>welcomeToBooleans</code> function so that it returns <code>true
 
 ```yml
 tests:
-  - text: 'The <code>welcomeToBooleans()</code> function should return a boolean &#40;true/false&#41; value.'
-    testString: 'assert(typeof welcomeToBooleans() === "boolean", "The <code>welcomeToBooleans()</code> function should return a boolean &#40;true/false&#41; value.");'
+  - text: The <code>welcomeToBooleans()</code> function should return a boolean &#40;true/false&#41; value.
+    testString: assert(typeof welcomeToBooleans() === 'boolean', 'The <code>welcomeToBooleans()</code> function should return a boolean &#40;true/false&#41; value.');
   - text: <code>welcomeToBooleans()</code> should return true.
-    testString: 'assert(welcomeToBooleans() === true, "<code>welcomeToBooleans()</code> should return true.");'
+    testString: assert(welcomeToBooleans() === true, '<code>welcomeToBooleans()</code> should return true.');
 
 ```
 
@@ -52,7 +52,7 @@ return false; // Change this line
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+welcomeToBooleans();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-case-sensitivity-in-variables.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-case-sensitivity-in-variables.english.md
index 06bc089f89..792e0f1758 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-case-sensitivity-in-variables.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-case-sensitivity-in-variables.english.md
@@ -25,17 +25,17 @@ Modify the existing declarations and assignments so their names use <dfn>camelCa
 ```yml
 tests:
   - text: <code>studlyCapVar</code> is defined and has a value of <code>10</code>
-    testString: 'assert(typeof studlyCapVar !== "undefined" && studlyCapVar === 10, "<code>studlyCapVar</code> is defined and has a value of <code>10</code>");'
+    testString: assert(typeof studlyCapVar !== 'undefined' && studlyCapVar === 10, '<code>studlyCapVar</code> is defined and has a value of <code>10</code>');
   - text: <code>properCamelCase</code> is defined and has a value of <code>"A String"</code>
-    testString: 'assert(typeof properCamelCase !== "undefined" && properCamelCase === "A String", "<code>properCamelCase</code> is defined and has a value of <code>"A String"</code>");'
+    testString: assert(typeof properCamelCase !== 'undefined' && properCamelCase === "A String", '<code>properCamelCase</code> is defined and has a value of <code>"A String"</code>');
   - text: <code>titleCaseOver</code> is defined and has a value of <code>9000</code>
-    testString: 'assert(typeof titleCaseOver !== "undefined" && titleCaseOver === 9000, "<code>titleCaseOver</code> is defined and has a value of <code>9000</code>");'
+    testString: assert(typeof titleCaseOver !== 'undefined' && titleCaseOver === 9000, '<code>titleCaseOver</code> is defined and has a value of <code>9000</code>');
   - text: <code>studlyCapVar</code> should use camelCase in both declaration and assignment sections.
-    testString: 'assert(code.match(/studlyCapVar/g).length === 2, "<code>studlyCapVar</code> should use camelCase in both declaration and assignment sections.");'
+    testString: assert(code.match(/studlyCapVar/g).length === 2, '<code>studlyCapVar</code> should use camelCase in both declaration and assignment sections.');
   - text: <code>properCamelCase</code> should use camelCase in both declaration and assignment sections.
-    testString: 'assert(code.match(/properCamelCase/g).length === 2, "<code>properCamelCase</code> should use camelCase in both declaration and assignment sections.");'
+    testString: assert(code.match(/properCamelCase/g).length === 2, '<code>properCamelCase</code> should use camelCase in both declaration and assignment sections.');
   - text: <code>titleCaseOver</code> should use camelCase in both declaration and assignment sections.
-    testString: 'assert(code.match(/titleCaseOver/g).length === 2, "<code>titleCaseOver</code> should use camelCase in both declaration and assignment sections.");'
+    testString: assert(code.match(/titleCaseOver/g).length === 2, '<code>titleCaseOver</code> should use camelCase in both declaration and assignment sections.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-undefined-value-returned-from-a-function.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-undefined-value-returned-from-a-function.english.md
index f5274dad4a..c6adf8cd13 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-undefined-value-returned-from-a-function.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-undefined-value-returned-from-a-function.english.md
@@ -23,13 +23,13 @@ Create a function <code>addFive</code> without any arguments. This function adds
 ```yml
 tests:
   - text: <code>addFive</code> should be a function
-    testString: 'assert(typeof addFive === "function", "<code>addFive</code> should be a function");'
+    testString: assert(typeof addFive === 'function', '<code>addFive</code> should be a function');
   - text: <code>sum</code> should be equal to 8
-    testString: 'assert(sum === 8, "<code>sum</code> should be equal to 8");'
+    testString: assert(sum === 8, '<code>sum</code> should be equal to 8');
   - text: Returned value from <code>addFive</code> should be <code>undefined</code>
-    testString: 'assert(addFive() === undefined, "Returned value from <code>addFive</code> should be <code>undefined</code>");'
-  - text: 'Inside of your functions, add 5 to the <code>sum</code> variable'
-    testString: 'assert(code.match(/(sum\s*\=\s*sum\s*\+\s*5)|(sum\s*\+\=\s*5)/g).length === 1, "Inside of your functions, add 5 to the <code>sum</code> variable");'
+    testString: assert(addFive() === undefined, 'Returned value from <code>addFive</code> should be <code>undefined</code>');
+  - text: Inside of your functions, add 5 to the <code>sum</code> variable
+    testString: assert(code.match(/(sum\s*\=\s*sum\s*\+\s*5)|(sum\s*\+\=\s*5)/g).length === 1, 'Inside of your functions, add 5 to the <code>sum</code> variable');
 
 ```
 
@@ -62,7 +62,10 @@ var returnedValue = addFive();
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+var sum = 0;
+function addThree() {sum = sum + 3;}
+addThree();
+addFive();
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-uninitialized-variables.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-uninitialized-variables.english.md
index 02099d0103..9c7844f7d2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-uninitialized-variables.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-uninitialized-variables.english.md
@@ -20,13 +20,13 @@ Initialize the three variables <code>a</code>, <code>b</code>, and <code>c</code
 ```yml
 tests:
   - text: <code>a</code> should be defined and evaluated to have the value of <code>6</code>
-    testString: 'assert(typeof a === "number" && a === 6, "<code>a</code> should be defined and evaluated to have the value of <code>6</code>");'
+    testString: assert(typeof a === 'number' && a === 6, '<code>a</code> should be defined and evaluated to have the value of <code>6</code>');
   - text: <code>b</code> should be defined and evaluated to have the value of <code>15</code>
-    testString: 'assert(typeof b === "number" && b === 15, "<code>b</code> should be defined and evaluated to have the value of <code>15</code>");'
+    testString: assert(typeof b === 'number' && b === 15, '<code>b</code> should be defined and evaluated to have the value of <code>15</code>');
   - text: <code>c</code> should not contain <code>undefined</code> and should have a value of "I am a String!"
-    testString: 'assert(!/undefined/.test(c) && c === "I am a String!", "<code>c</code> should not contain <code>undefined</code> and should have a value of "I am a String!"");'
+    testString: assert(!/undefined/.test(c) && c === "I am a String!", '<code>c</code> should not contain <code>undefined</code> and should have a value of "I am a String!"');
   - text: Do not change code below the line
-    testString: 'assert(/a = a \+ 1;/.test(code) && /b = b \+ 5;/.test(code) && /c = c \+ " String!";/.test(code), "Do not change code below the line");'
+    testString: assert(/a = a \+ 1;/.test(code) && /b = b \+ 5;/.test(code) && /c = c \+ " String!";/.test(code), 'Do not change code below the line');
 
 ```
 
@@ -58,7 +58,7 @@ c = c + " String!";
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = '" + c + "'"; })(a,b,c);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/updating-object-properties.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/updating-object-properties.english.md
index 0cba7f4887..d5f02fb391 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/updating-object-properties.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/updating-object-properties.english.md
@@ -26,9 +26,9 @@ Update the <code>myDog</code> object's name property. Let's change her name from
 ```yml
 tests:
   - text: Update <code>myDog</code>&apos;s <code>"name"</code> property to equal "Happy Coder".
-    testString: 'assert(/happy coder/gi.test(myDog.name), "Update <code>myDog</code>&apos;s <code>"name"</code> property to equal "Happy Coder".");'
+    testString: assert(/happy coder/gi.test(myDog.name), 'Update <code>myDog</code>&apos;s <code>"name"</code> property to equal "Happy Coder".');
   - text: Do not edit the <code>myDog</code> definition
-    testString: 'assert(/"name": "Coder"/.test(code), "Do not edit the <code>myDog</code> definition");'
+    testString: 'assert(/"name": "Coder"/.test(code), ''Do not edit the <code>myDog</code> definition'');'
 
 ```
 
@@ -70,7 +70,7 @@ var myDog = {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(z){return z;})(myDog);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-first-character-in-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-first-character-in-a-string.english.md
index f7daf1bb88..05a9fda0ac 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-first-character-in-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-first-character-in-a-string.english.md
@@ -23,9 +23,9 @@ Use <dfn>bracket notation</dfn> to find the first character in the <code>lastNam
 ```yml
 tests:
   - text: The <code>firstLetterOfLastName</code> variable should have the value of <code>L</code>.
-    testString: 'assert(firstLetterOfLastName === "L", "The <code>firstLetterOfLastName</code> variable should have the value of <code>L</code>.");'
+    testString: assert(firstLetterOfLastName === 'L', 'The <code>firstLetterOfLastName</code> variable should have the value of <code>L</code>.');
   - text: You should use bracket notation.
-    testString: 'assert(code.match(/firstLetterOfLastName\s*?=\s*?lastName\[.*?\]/), "You should use bracket notation.");'
+    testString: assert(code.match(/firstLetterOfLastName\s*?=\s*?lastName\[.*?\]/), 'You should use bracket notation.');
 
 ```
 
@@ -60,7 +60,7 @@ firstLetterOfLastName = lastName;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(v){return v;})(firstLetterOfLastName);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-last-character-in-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-last-character-in-a-string.english.md
index a8b2e0af47..26656814f2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-last-character-in-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-last-character-in-a-string.english.md
@@ -22,9 +22,9 @@ Use <dfn>bracket notation</dfn> to find the last character in the <code>lastName
 ```yml
 tests:
   - text: <code>lastLetterOfLastName</code> should be "e".
-    testString: 'assert(lastLetterOfLastName === "e", "<code>lastLetterOfLastName</code> should be "e".");'
+    testString: assert(lastLetterOfLastName === "e", '<code>lastLetterOfLastName</code> should be "e".');
   - text: You have to use <code>.length</code> to get the last letter.
-    testString: 'assert(code.match(/\.length/g).length === 2, "You have to use <code>.length</code> to get the last letter.");'
+    testString: assert(code.match(/\.length/g).length === 2, 'You have to use <code>.length</code> to get the last letter.');
 
 ```
 
@@ -56,7 +56,7 @@ var lastLetterOfLastName = lastName;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(v){return v;})(lastLetterOfLastName);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-character-in-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-character-in-a-string.english.md
index 78961dc9ba..9baa96ed76 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-character-in-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-character-in-a-string.english.md
@@ -22,9 +22,9 @@ Let's try to set <code>thirdLetterOfLastName</code> to equal the third letter of
 ```yml
 tests:
   - text: The <code>thirdLetterOfLastName</code> variable should have the value of <code>v</code>.
-    testString: 'assert(thirdLetterOfLastName === "v", "The <code>thirdLetterOfLastName</code> variable should have the value of <code>v</code>.");'
+    testString: assert(thirdLetterOfLastName === 'v', 'The <code>thirdLetterOfLastName</code> variable should have the value of <code>v</code>.');
   - text: You should use bracket notation.
-    testString: 'assert(code.match(/thirdLetterOfLastName\s*?=\s*?lastName\[.*?\]/), "You should use bracket notation.");'
+    testString: assert(code.match(/thirdLetterOfLastName\s*?=\s*?lastName\[.*?\]/), 'You should use bracket notation.');
 
 ```
 
@@ -56,7 +56,7 @@ var thirdLetterOfLastName = lastName;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(v){return v;})(thirdLetterOfLastName);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-to-last-character-in-a-string.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-to-last-character-in-a-string.english.md
index ef0e0a672e..df381f9834 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-to-last-character-in-a-string.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-nth-to-last-character-in-a-string.english.md
@@ -22,9 +22,9 @@ Use <dfn>bracket notation</dfn> to find the second-to-last character in the <cod
 ```yml
 tests:
   - text: <code>secondToLastLetterOfLastName</code> should be "c".
-    testString: 'assert(secondToLastLetterOfLastName === "c", "<code>secondToLastLetterOfLastName</code> should be "c".");'
+    testString: assert(secondToLastLetterOfLastName === 'c', '<code>secondToLastLetterOfLastName</code> should be "c".');
   - text: You have to use <code>.length</code> to get the second last letter.
-    testString: 'assert(code.match(/\.length/g).length === 2, "You have to use <code>.length</code> to get the second last letter.");'
+    testString: assert(code.match(/\.length/g).length === 2, 'You have to use <code>.length</code> to get the second last letter.');
 
 ```
 
@@ -56,7 +56,7 @@ var secondToLastLetterOfLastName = lastName;
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+(function(v){return v;})(secondToLastLetterOfLastName);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-conditional-logic-with-if-statements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-conditional-logic-with-if-statements.english.md
index 51b43c7245..bd6ebb6cb7 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-conditional-logic-with-if-statements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-conditional-logic-with-if-statements.english.md
@@ -26,15 +26,15 @@ Create an <code>if</code> statement inside the function to return <code>"Yes, th
 ```yml
 tests:
   - text: <code>trueOrFalse</code> should be a function
-    testString: 'assert(typeof trueOrFalse === "function", "<code>trueOrFalse</code> should be a function");'
+    testString: assert(typeof trueOrFalse === "function", '<code>trueOrFalse</code> should be a function');
   - text: <code>trueOrFalse(true)</code> should return a string
-    testString: 'assert(typeof trueOrFalse(true) === "string", "<code>trueOrFalse(true)</code> should return a string");'
+    testString: assert(typeof trueOrFalse(true) === "string", '<code>trueOrFalse(true)</code> should return a string');
   - text: <code>trueOrFalse(false)</code> should return a string
-    testString: 'assert(typeof trueOrFalse(false) === "string", "<code>trueOrFalse(false)</code> should return a string");'
-  - text: '<code>trueOrFalse(true)</code> should return "Yes, that was true"'
-    testString: 'assert(trueOrFalse(true) === "Yes, that was true", "<code>trueOrFalse(true)</code> should return "Yes, that was true"");'
-  - text: '<code>trueOrFalse(false)</code> should return "No, that was false"'
-    testString: 'assert(trueOrFalse(false) === "No, that was false", "<code>trueOrFalse(false)</code> should return "No, that was false"");'
+    testString: assert(typeof trueOrFalse(false) === "string", '<code>trueOrFalse(false)</code> should return a string');
+  - text: <code>trueOrFalse(true)</code> should return "Yes, that was true"
+    testString: assert(trueOrFalse(true) === "Yes, that was true", '<code>trueOrFalse(true)</code> should return "Yes, that was true"');
+  - text: <code>trueOrFalse(false)</code> should return "No, that was false"
+    testString: assert(trueOrFalse(false) === "No, that was false", '<code>trueOrFalse(false)</code> should return "No, that was false"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-multiple-conditional-ternary-operators.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-multiple-conditional-ternary-operators.english.md
index 474e936c1c..301cb9e673 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-multiple-conditional-ternary-operators.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-multiple-conditional-ternary-operators.english.md
@@ -24,13 +24,13 @@ Use multiple <code>conditional operators</code> in the <code>checkSign</code> fu
 ```yml
 tests:
   - text: <code>checkSign</code> should use multiple <code>conditional operators</code>
-    testString: 'assert(/.+?\s*?\?\s*?.+?\s*?:\s*?.+?\s*?\?\s*?.+?\s*?:\s*?.+?/gi.test(code), "<code>checkSign</code> should use multiple <code>conditional operators</code>");'
+    testString: assert(/.+?\s*?\?\s*?.+?\s*?:\s*?.+?\s*?\?\s*?.+?\s*?:\s*?.+?/gi.test(code), '<code>checkSign</code> should use multiple <code>conditional operators</code>');
   - text: <code>checkSign(10)</code> should return "positive". Note that capitalization matters
-    testString: 'assert(checkSign(10) === "positive", "<code>checkSign(10)</code> should return "positive". Note that capitalization matters");'
+    testString: assert(checkSign(10) === 'positive', '<code>checkSign(10)</code> should return "positive". Note that capitalization matters');
   - text: <code>checkSign(-12)</code> should return "negative". Note that capitalization matters
-    testString: 'assert(checkSign(-12) === "negative", "<code>checkSign(-12)</code> should return "negative". Note that capitalization matters");'
+    testString: assert(checkSign(-12) === 'negative', '<code>checkSign(-12)</code> should return "negative". Note that capitalization matters');
   - text: <code>checkSign(0)</code> should return "zero". Note that capitalization matters
-    testString: 'assert(checkSign(0) === "zero", "<code>checkSign(0)</code> should return "zero". Note that capitalization matters");'
+    testString: assert(checkSign(0) === 'zero', '<code>checkSign(0)</code> should return "zero". Note that capitalization matters');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-conditional-ternary-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-conditional-ternary-operator.english.md
index 90c0a60387..7e71afe8f3 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-conditional-ternary-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-conditional-ternary-operator.english.md
@@ -26,13 +26,13 @@ Use the <code>conditional operator</code> in the <code>checkEqual</code> functio
 ```yml
 tests:
   - text: <code>checkEqual</code> should use the <code>conditional operator</code>
-    testString: 'assert(/.+?\s*?\?\s*?.+?\s*?:\s*?.+?/gi.test(code), "<code>checkEqual</code> should use the <code>conditional operator</code>");'
-  - text: '<code>checkEqual(1, 2)</code> should return false'
-    testString: 'assert(checkEqual(1, 2) === false, "<code>checkEqual(1, 2)</code> should return false");'
-  - text: '<code>checkEqual(1, 1)</code> should return true'
-    testString: 'assert(checkEqual(1, 1) === true, "<code>checkEqual(1, 1)</code> should return true");'
-  - text: '<code>checkEqual(1, -1)</code> should return false'
-    testString: 'assert(checkEqual(1, -1) === false, "<code>checkEqual(1, -1)</code> should return false");'
+    testString: assert(/.+?\s*?\?\s*?.+?\s*?:\s*?.+?/gi.test(code), '<code>checkEqual</code> should use the <code>conditional operator</code>');
+  - text: <code>checkEqual(1, 2)</code> should return false
+    testString: assert(checkEqual(1, 2) === false, '<code>checkEqual(1, 2)</code> should return false');
+  - text: <code>checkEqual(1, 1)</code> should return true
+    testString: assert(checkEqual(1, 1) === true, '<code>checkEqual(1, 1)</code> should return true');
+  - text: <code>checkEqual(1, -1)</code> should return false
+    testString: assert(checkEqual(1, -1) === false, '<code>checkEqual(1, -1)</code> should return false');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix.english.md
index 1e10e4a9b9..3b4e53da26 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function-with-a-radix.english.md
@@ -25,15 +25,15 @@ Use <code>parseInt()</code> in the <code>convertToInteger</code> function so it
 ```yml
 tests:
   - text: <code>convertToInteger</code> should use the <code>parseInt()</code> function
-    testString: 'assert(/parseInt/g.test(code), "<code>convertToInteger</code> should use the <code>parseInt()</code> function");'
+    testString: assert(/parseInt/g.test(code), '<code>convertToInteger</code> should use the <code>parseInt()</code> function');
   - text: <code>convertToInteger("10011")</code> should return a number
-    testString: 'assert(typeof(convertToInteger("10011")) === "number", "<code>convertToInteger("10011")</code> should return a number");'
+    testString: assert(typeof(convertToInteger("10011")) === "number", '<code>convertToInteger("10011")</code> should return a number');
   - text: <code>convertToInteger("10011")</code> should return 19
-    testString: 'assert(convertToInteger("10011") === 19, "<code>convertToInteger("10011")</code> should return 19");'
+    testString: assert(convertToInteger("10011") === 19, '<code>convertToInteger("10011")</code> should return 19');
   - text: <code>convertToInteger("111001")</code> should return 57
-    testString: 'assert(convertToInteger("111001") === 57, "<code>convertToInteger("111001")</code> should return 57");'
+    testString: assert(convertToInteger("111001") === 57, '<code>convertToInteger("111001")</code> should return 57');
   - text: <code>convertToInteger("JamesBond")</code> should return NaN
-    testString: 'assert.isNaN(convertToInteger("JamesBond"), "<code>convertToInteger("JamesBond")</code> should return NaN");'
+    testString: assert.isNaN(convertToInteger("JamesBond"), '<code>convertToInteger("JamesBond")</code> should return NaN');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function.english.md
index 9ce41ebe3c..27c34e5a6e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-the-parseint-function.english.md
@@ -22,15 +22,15 @@ Use <code>parseInt()</code> in the <code>convertToInteger</code> function so it
 ```yml
 tests:
   - text: <code>convertToInteger</code> should use the <code>parseInt()</code> function
-    testString: 'assert(/parseInt/g.test(code), "<code>convertToInteger</code> should use the <code>parseInt()</code> function");'
+    testString: assert(/parseInt/g.test(code), '<code>convertToInteger</code> should use the <code>parseInt()</code> function');
   - text: <code>convertToInteger("56")</code> should return a number
-    testString: 'assert(typeof(convertToInteger("56")) === "number", "<code>convertToInteger("56")</code> should return a number");'
+    testString: assert(typeof(convertToInteger("56")) === "number", '<code>convertToInteger("56")</code> should return a number');
   - text: <code>convertToInteger("56")</code> should return 56
-    testString: 'assert(convertToInteger("56") === 56, "<code>convertToInteger("56")</code> should return 56");'
+    testString: assert(convertToInteger("56") === 56, '<code>convertToInteger("56")</code> should return 56');
   - text: <code>convertToInteger("77")</code> should return 77
-    testString: 'assert(convertToInteger("77") === 77, "<code>convertToInteger("77")</code> should return 77");'
+    testString: assert(convertToInteger("77") === 77, '<code>convertToInteger("77")</code> should return 77');
   - text: <code>convertToInteger("JamesBond")</code> should return NaN
-    testString: 'assert.isNaN(convertToInteger("JamesBond"), "<code>convertToInteger("JamesBond")</code> should return NaN");'
+    testString: assert.isNaN(convertToInteger("JamesBond"), '<code>convertToInteger("JamesBond")</code> should return NaN');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/using-objects-for-lookups.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/using-objects-for-lookups.english.md
index 7cc21ee56b..69d3dc145e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/using-objects-for-lookups.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/using-objects-for-lookups.english.md
@@ -22,23 +22,23 @@ Convert the switch statement into an object called <code>lookup</code>. Use it t
 ```yml
 tests:
   - text: <code>phoneticLookup("alpha")</code> should equal <code>"Adams"</code>
-    testString: 'assert(phoneticLookup("alpha") === "Adams", "<code>phoneticLookup("alpha")</code> should equal <code>"Adams"</code>");'
+    testString: assert(phoneticLookup("alpha") === 'Adams', '<code>phoneticLookup("alpha")</code> should equal <code>"Adams"</code>');
   - text: <code>phoneticLookup("bravo")</code> should equal <code>"Boston"</code>
-    testString: 'assert(phoneticLookup("bravo") === "Boston", "<code>phoneticLookup("bravo")</code> should equal <code>"Boston"</code>");'
+    testString: assert(phoneticLookup("bravo") === 'Boston', '<code>phoneticLookup("bravo")</code> should equal <code>"Boston"</code>');
   - text: <code>phoneticLookup("charlie")</code> should equal <code>"Chicago"</code>
-    testString: 'assert(phoneticLookup("charlie") === "Chicago", "<code>phoneticLookup("charlie")</code> should equal <code>"Chicago"</code>");'
+    testString: assert(phoneticLookup("charlie") === 'Chicago', '<code>phoneticLookup("charlie")</code> should equal <code>"Chicago"</code>');
   - text: <code>phoneticLookup("delta")</code> should equal <code>"Denver"</code>
-    testString: 'assert(phoneticLookup("delta") === "Denver", "<code>phoneticLookup("delta")</code> should equal <code>"Denver"</code>");'
+    testString: assert(phoneticLookup("delta") === 'Denver', '<code>phoneticLookup("delta")</code> should equal <code>"Denver"</code>');
   - text: <code>phoneticLookup("echo")</code> should equal <code>"Easy"</code>
-    testString: 'assert(phoneticLookup("echo") === "Easy", "<code>phoneticLookup("echo")</code> should equal <code>"Easy"</code>");'
+    testString: assert(phoneticLookup("echo") === 'Easy', '<code>phoneticLookup("echo")</code> should equal <code>"Easy"</code>');
   - text: <code>phoneticLookup("foxtrot")</code> should equal <code>"Frank"</code>
-    testString: 'assert(phoneticLookup("foxtrot") === "Frank", "<code>phoneticLookup("foxtrot")</code> should equal <code>"Frank"</code>");'
+    testString: assert(phoneticLookup("foxtrot") === 'Frank', '<code>phoneticLookup("foxtrot")</code> should equal <code>"Frank"</code>');
   - text: <code>phoneticLookup("")</code> should equal <code>undefined</code>
-    testString: 'assert(typeof phoneticLookup("") === "undefined", "<code>phoneticLookup("")</code> should equal <code>undefined</code>");'
+    testString: assert(typeof phoneticLookup("") === 'undefined', '<code>phoneticLookup("")</code> should equal <code>undefined</code>');
   - text: You should not modify the <code>return</code> statement
-    testString: 'assert(code.match(/return\sresult;/), "You should not modify the <code>return</code> statement");'
-  - text: 'You should not use <code>case</code>, <code>switch</code>, or <code>if</code> statements'
-    testString: 'assert(!/case|switch|if/g.test(code.replace(/([/]{2}.*)|([/][*][^/*]*[*][/])/g,"")), "You should not use <code>case</code>, <code>switch</code>, or <code>if</code> statements"); '
+    testString: assert(code.match(/return\sresult;/), 'You should not modify the <code>return</code> statement');
+  - text: You should not use <code>case</code>, <code>switch</code>, or <code>if</code> statements
+    testString: assert(!/case|switch|if/g.test(code.replace(/([/]{2}.*)|([/][*][^/*]*[*][/])/g,'')), 'You should not use <code>case</code>, <code>switch</code>, or <code>if</code> statements');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.english.md
index 7260b46bd2..696b957beb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/word-blanks.english.md
@@ -24,12 +24,12 @@ You will also need to account for spaces in your string, so that the final sente
 
 ```yml
 tests:
-  - text: '<code>wordBlanks("","","","")</code> should return a string.'
-    testString: 'assert(typeof wordBlanks("","","","") === "string", "<code>wordBlanks("","","","")</code> should return a string.");'
-  - text: '<code>wordBlanks("dog", "big", "ran", "quickly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).'
-    testString: 'assert(/\bdog\b/.test(test1) && /\bbig\b/.test(test1) && /\bran\b/.test(test1) && /\bquickly\b/.test(test1),"<code>wordBlanks("dog", "big", "ran", "quickly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).");'
-  - text: '<code>wordBlanks("cat", "little", "hit", "slowly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).'
-    testString: 'assert(/\bcat\b/.test(test2) && /\blittle\b/.test(test2) && /\bhit\b/.test(test2) && /\bslowly\b/.test(test2),"<code>wordBlanks("cat", "little", "hit", "slowly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).");'
+  - text: <code>wordBlanks("","","","")</code> should return a string.
+    testString: assert(typeof wordBlanks("","","","") === 'string', '<code>wordBlanks("","","","")</code> should return a string.');
+  - text: <code>wordBlanks("dog", "big", "ran", "quickly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).
+    testString: assert(/\bdog\b/.test(test1) && /\bbig\b/.test(test1) && /\bran\b/.test(test1) && /\bquickly\b/.test(test1),'<code>wordBlanks("dog", "big", "ran", "quickly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).');
+  - text: <code>wordBlanks("cat", "little", "hit", "slowly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).
+    testString: assert(/\bcat\b/.test(test2) && /\blittle\b/.test(test2) && /\bhit\b/.test(test2) && /\bslowly\b/.test(test2),'<code>wordBlanks("cat", "little", "hit", "slowly")</code> should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).');
 
 ```
 
@@ -60,7 +60,8 @@ wordBlanks("dog", "big", "ran", "quickly");
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+var test1 = wordBlanks("dog", "big", "ran", "quickly");
+var test2 = wordBlanks("cat", "little", "hit", "slowly");
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/write-reusable-javascript-with-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/write-reusable-javascript-with-functions.english.md
index 845aec34f7..5f3953c762 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/write-reusable-javascript-with-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/write-reusable-javascript-with-functions.english.md
@@ -25,11 +25,11 @@ Each time the function is called it will print out the message <code>"Hello Worl
 ```yml
 tests:
   - text: <code>reusableFunction</code> should be a function
-    testString: 'assert(typeof reusableFunction === "function", "<code>reusableFunction</code> should be a function");'
+    testString: assert(typeof reusableFunction === 'function', '<code>reusableFunction</code> should be a function');
   - text: <code>reusableFunction</code> should output "Hi World" to the dev console
-    testString: 'assert("Hi World" === logOutput, "<code>reusableFunction</code> should output "Hi World" to the dev console");'
+    testString: assert("Hi World" === logOutput, '<code>reusableFunction</code> should output "Hi World" to the dev console');
   - text: Call <code>reusableFunction</code> after you define it
-    testString: 'assert(/^\s*reusableFunction\(\)\s*;/m.test(code), "Call <code>reusableFunction</code> after you define it");'
+    testString: assert(/^\s*reusableFunction\(\)\s*;/m.test(code), 'Call <code>reusableFunction</code> after you define it');
 
 ```
 
@@ -86,7 +86,13 @@ capture();
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+uncapture();
+
+if (typeof reusableFunction !== "function") { 
+  (function() { return "reusableFunction is not defined"; })();
+} else {
+  (function() { return logOutput || "console.log never called"; })();
+}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-arguments-passed-in-the-wrong-order-when-calling-a-function.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-arguments-passed-in-the-wrong-order-when-calling-a-function.english.md
index 6c9deb14fe..3e3ff200f5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-arguments-passed-in-the-wrong-order-when-calling-a-function.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-arguments-passed-in-the-wrong-order-when-calling-a-function.english.md
@@ -19,10 +19,10 @@ The function <code>raiseToPower</code> raises a base to an exponent. Unfortunate
 
 ```yml
 tests:
-  - text: 'Your code should fix the variable <code>power</code> so it equals 2 raised to the 3rd power, not 3 raised to the 2nd power.'
-    testString: 'assert(power == 8, "Your code should fix the variable <code>power</code> so it equals 2 raised to the 3rd power, not 3 raised to the 2nd power.");'
+  - text: Your code should fix the variable <code>power</code> so it equals 2 raised to the 3rd power, not 3 raised to the 2nd power.
+    testString: assert(power == 8, 'Your code should fix the variable <code>power</code> so it equals 2 raised to the 3rd power, not 3 raised to the 2nd power.');
   - text: Your code should use the correct order of the arguments for the <code>raiseToPower</code> function call.
-    testString: 'assert(code.match(/raiseToPower\(\s*?base\s*?,\s*?exp\s*?\);/g), "Your code should use the correct order of the arguments for the <code>raiseToPower</code> function call.");'
+    testString: assert(code.match(/raiseToPower\(\s*?base\s*?,\s*?exp\s*?\);/g), 'Your code should use the correct order of the arguments for the <code>raiseToPower</code> function call.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-missing-open-and-closing-parenthesis-after-a-function-call.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-missing-open-and-closing-parenthesis-after-a-function-call.english.md
index 1dbfd8a289..04e267b811 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-missing-open-and-closing-parenthesis-after-a-function-call.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-missing-open-and-closing-parenthesis-after-a-function-call.english.md
@@ -22,9 +22,9 @@ Fix the code so the variable <code>result</code> is set to the value returned fr
 ```yml
 tests:
   - text: Your code should fix the variable <code>result</code> so it is set to the number that the function <code>getNine</code> returns.
-    testString: 'assert(result == 9, "Your code should fix the variable <code>result</code> so it is set to the number that the function <code>getNine</code> returns.");'
+    testString: assert(result == 9, 'Your code should fix the variable <code>result</code> so it is set to the number that the function <code>getNine</code> returns.');
   - text: Your code should call the <code>getNine</code> function.
-    testString: 'assert(code.match(/getNine\(\)/g).length == 2, "Your code should call the <code>getNine</code> function.");'
+    testString: assert(code.match(/getNine\(\)/g).length == 2, 'Your code should call the <code>getNine</code> function.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-misspelled-variable-and-function-names.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-misspelled-variable-and-function-names.english.md
index 6e75ab79bf..6d2d0c1fa3 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-misspelled-variable-and-function-names.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-misspelled-variable-and-function-names.english.md
@@ -21,15 +21,15 @@ Fix the two spelling errors in the code so the <code>netWorkingCapital</code> ca
 ```yml
 tests:
   - text: 'Check the spelling of the two variables used in the netWorkingCapital calculation, the console output should show that "Net working capital is: 2".'
-    testString: 'assert(netWorkingCapital === 2, "Check the spelling of the two variables used in the netWorkingCapital calculation, the console output should show that "Net working capital is: 2".");'
+    testString: 'assert(netWorkingCapital === 2, ''Check the spelling of the two variables used in the netWorkingCapital calculation, the console output should show that "Net working capital is: 2".'');'
   - text: There should be no instances of mis-spelled variables in the code.
-    testString: 'assert(!code.match(/recievables/g), "There should be no instances of mis-spelled variables in the code.");'
+    testString: assert(!code.match(/recievables/g), 'There should be no instances of mis-spelled variables in the code.');
   - text: The <code>receivables</code> variable should be declared and used properly in the code.
-    testString: 'assert(code.match(/receivables/g).length == 2, "The <code>receivables</code> variable should be declared and used properly in the code.");'
+    testString: assert(code.match(/receivables/g).length == 2, 'The <code>receivables</code> variable should be declared and used properly in the code.');
   - text: There should be no instances of mis-spelled variables in the code.
-    testString: 'assert(!code.match(/payable;/g), "There should be no instances of mis-spelled variables in the code.");'
+    testString: assert(!code.match(/payable;/g), 'There should be no instances of mis-spelled variables in the code.');
   - text: The <code>payables</code> variable should be declared and used properly in the code.
-    testString: 'assert(code.match(/payables/g).length == 2, "The <code>payables</code> variable should be declared and used properly in the code.");'
+    testString: assert(code.match(/payables/g).length == 2, 'The <code>payables</code> variable should be declared and used properly in the code.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-mixed-usage-of-single-and-double-quotes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-mixed-usage-of-single-and-double-quotes.english.md
index e42d577a13..7315232cf0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-mixed-usage-of-single-and-double-quotes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-mixed-usage-of-single-and-double-quotes.english.md
@@ -6,7 +6,7 @@ challengeType: 1
 
 ## Description
 <section id='description'>
-JavaScript allows the use of both single (") and double ("") quotes to declare a string. Deciding which one to use generally comes down to personal preference, with some exceptions.
+JavaScript allows the use of both single ('') and double ("") quotes to declare a string. Deciding which one to use generally comes down to personal preference, with some exceptions.
 Having two choices is great when a string has contractions or another piece of text that's in quotes. Just be careful that you don't close the string too early, which causes a syntax error.
 Here are some examples of mixing quotes:
 <blockquote>// These are correct:<br>const grouchoContraction = "I've had a perfectly wonderful evening, but this wasn't it.";<br>const quoteInString = "Groucho Marx once said 'Quote me as saying I was mis-quoted.'";<br>// This is incorrect:<br>const uhOhGroucho = 'I've had a perfectly wonderful evening, but this wasn't it.';</blockquote>
@@ -24,10 +24,10 @@ Fix the string so it either uses different quotes for the <code>href</code> valu
 
 ```yml
 tests:
-  - text: 'Your code should fix the quotes around the <code>href</code> value "#Home" by either changing or escaping them.'
-    testString: 'assert(code.match(/<a href=\s*?("|\\")#Home\1\s*?>/g), "Your code should fix the quotes around the <code>href</code> value "#Home" by either changing or escaping them.");'
+  - text: Your code should fix the quotes around the <code>href</code> value "#Home" by either changing or escaping them.
+    testString: assert(code.match(/<a href=\s*?('|\\")#Home\1\s*?>/g), 'Your code should fix the quotes around the <code>href</code> value "#Home" by either changing or escaping them.');
   - text: Your code should keep the double quotes around the entire string.
-    testString: 'assert(code.match(/"<p>.*?<\/p>";/g), "Your code should keep the double quotes around the entire string.");'
+    testString: assert(code.match(/"<p>.*?<\/p>";/g), 'Your code should keep the double quotes around the entire string.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-off-by-one-errors-when-using-indexing.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-off-by-one-errors-when-using-indexing.english.md
index f1cbba115a..eb0d6d5135 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-off-by-one-errors-when-using-indexing.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-off-by-one-errors-when-using-indexing.english.md
@@ -22,13 +22,13 @@ Fix the two indexing errors in the following function so all the numbers 1 throu
 ```yml
 tests:
   - text: Your code should set the initial condition of the loop so it starts at the first index.
-    testString: 'assert(code.match(/i\s*?=\s*?0\s*?;/g).length == 1, "Your code should set the initial condition of the loop so it starts at the first index.");'
+    testString: assert(code.match(/i\s*?=\s*?0\s*?;/g).length == 1, 'Your code should set the initial condition of the loop so it starts at the first index.');
   - text: Your code should fix the initial condition of the loop so that the index starts at 0.
-    testString: 'assert(!code.match(/i\s?=\s*?1\s*?;/g), "Your code should fix the initial condition of the loop so that the index starts at 0.");'
+    testString: assert(!code.match(/i\s?=\s*?1\s*?;/g), 'Your code should fix the initial condition of the loop so that the index starts at 0.');
   - text: Your code should set the terminal condition of the loop so it stops at the last index.
-    testString: 'assert(code.match(/i\s*?<\s*?len\s*?;/g).length == 1, "Your code should set the terminal condition of the loop so it stops at the last index.");'
+    testString: assert(code.match(/i\s*?<\s*?len\s*?;/g).length == 1, 'Your code should set the terminal condition of the loop so it stops at the last index.');
   - text: Your code should fix the terminal condition of the loop so that it stops at 1 before the length.
-    testString: 'assert(!code.match(/i\s*?<=\s*?len;/g), "Your code should fix the terminal condition of the loop so that it stops at 1 before the length.");'
+    testString: assert(!code.match(/i\s*?<=\s*?len;/g), 'Your code should fix the terminal condition of the loop so that it stops at 1 before the length.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-unclosed-parentheses-brackets-braces-and-quotes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-unclosed-parentheses-brackets-braces-and-quotes.english.md
index 22a4adf62f..a833aec982 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-unclosed-parentheses-brackets-braces-and-quotes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-unclosed-parentheses-brackets-braces-and-quotes.english.md
@@ -21,9 +21,9 @@ Fix the two pair errors in the code.
 ```yml
 tests:
   - text: Your code should fix the missing piece of the array.
-    testString: 'assert(code.match(/myArray\s*?=\s*?\[\s*?1\s*?,\s*?2\s*?,\s*?3\s*?\];/g), "Your code should fix the missing piece of the array.");'
+    testString: assert(code.match(/myArray\s*?=\s*?\[\s*?1\s*?,\s*?2\s*?,\s*?3\s*?\];/g), 'Your code should fix the missing piece of the array.');
   - text: 'Your code should fix the missing piece of the <code>.reduce()</code> method. The console output should show that "Sum of array values is: 6".'
-    testString: 'assert(arraySum === 6, "Your code should fix the missing piece of the <code>.reduce()</code> method. The console output should show that "Sum of array values is: 6".");'
+    testString: 'assert(arraySum === 6, ''Your code should fix the missing piece of the <code>.reduce()</code> method. The console output should show that "Sum of array values is: 6".'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-use-of-assignment-operator-instead-of-equality-operator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-use-of-assignment-operator-instead-of-equality-operator.english.md
index e1e3722590..4379acc9dd 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-use-of-assignment-operator-instead-of-equality-operator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/catch-use-of-assignment-operator-instead-of-equality-operator.english.md
@@ -23,10 +23,10 @@ Fix the condition so the program runs the right branch, and the appropriate valu
 
 ```yml
 tests:
-  - text: 'Your code should fix the condition so it checks for equality, instead of using assignment.'
-    testString: 'assert(result == "Not equal!", "Your code should fix the condition so it checks for equality, instead of using assignment.");'
+  - text: Your code should fix the condition so it checks for equality, instead of using assignment.
+    testString: assert(result == "Not equal!", 'Your code should fix the condition so it checks for equality, instead of using assignment.');
   - text: The condition can use either <code>==</code> or <code>===</code> to test for equality.
-    testString: 'assert(code.match(/x\s*?===?\s*?y/g), "The condition can use either <code>==</code> or <code>===</code> to test for equality.");'
+    testString: assert(code.match(/x\s*?===?\s*?y/g), 'The condition can use either <code>==</code> or <code>===</code> to test for equality.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/prevent-infinite-loops-with-a-valid-terminal-condition.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/prevent-infinite-loops-with-a-valid-terminal-condition.english.md
index b1498767be..bdf4b92b23 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/prevent-infinite-loops-with-a-valid-terminal-condition.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/prevent-infinite-loops-with-a-valid-terminal-condition.english.md
@@ -23,9 +23,9 @@ The <code>myFunc()</code> function contains an infinite loop because the termina
 ```yml
 tests:
   - text: Your code should change the comparison operator in the terminal condition (the middle part) of the <code>for</code> loop.
-    testString: 'assert(code.match(/i\s*?<=\s*?4;/g).length == 1, "Your code should change the comparison operator in the terminal condition (the middle part) of the <code>for</code> loop.");'
+    testString: assert(code.match(/i\s*?<=\s*?4;/g).length == 1, 'Your code should change the comparison operator in the terminal condition (the middle part) of the <code>for</code> loop.');
   - text: Your code should fix the comparison operator in the terminal condition of the loop.
-    testString: 'assert(!code.match(/i\s*?!=\s*?4;/g), "Your code should fix the comparison operator in the terminal condition of the loop.");'
+    testString: assert(!code.match(/i\s*?!=\s*?4;/g), 'Your code should fix the comparison operator in the terminal condition of the loop.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/understanding-the-differences-between-the-freecodecamp-and-browser-console.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/understanding-the-differences-between-the-freecodecamp-and-browser-console.english.md
index 0a6d97b229..97e8da997b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/understanding-the-differences-between-the-freecodecamp-and-browser-console.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/understanding-the-differences-between-the-freecodecamp-and-browser-console.english.md
@@ -26,11 +26,11 @@ Use <code>console.log()</code> to print the variables in the code where indicate
 ```yml
 tests:
   - text: Use <code>console.log()</code> to print the <code>outputTwo</code> variable.  In your Browser Console this should print out the value of the variable two times.
-    testString: 'assert(code.match(/console\.log\(outputTwo\)/g), "Use <code>console.log()</code> to print the <code>outputTwo</code> variable.  In your Browser Console this should print out the value of the variable two times.");'
+    testString: assert(code.match(/console\.log\(outputTwo\)/g), 'Use <code>console.log()</code> to print the <code>outputTwo</code> variable.  In your Browser Console this should print out the value of the variable two times.');
   - text: Use <code>console.log()</code> to print the <code>outputOne</code> variable.
-    testString: 'assert(code.match(/console\.log\(outputOne\)/g), "Use <code>console.log()</code> to print the <code>outputOne</code> variable.");'
+    testString: assert(code.match(/console\.log\(outputOne\)/g), 'Use <code>console.log()</code> to print the <code>outputOne</code> variable.');
   - text: Use <code>console.clear()</code> to modify your output so that <code>outputOne</code> variable only outputs once.
-    testString: 'assert(code.match(/^(\s*console.clear\(\);?\s*)$/gm), "Use <code>console.clear()</code> to modify your output so that <code>outputOne</code> variable only outputs once.");'
+    testString: assert(code.match(/^(\s*console.clear\(\);?\s*)$/gm), 'Use <code>console.clear()</code> to modify your output so that <code>outputOne</code> variable only outputs once.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-caution-when-reinitializing-variables-inside-a-loop.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-caution-when-reinitializing-variables-inside-a-loop.english.md
index 6e4ce4e760..9e5409cc25 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-caution-when-reinitializing-variables-inside-a-loop.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-caution-when-reinitializing-variables-inside-a-loop.english.md
@@ -21,11 +21,11 @@ The following function is supposed to create a two-dimensional array with <code>
 ```yml
 tests:
   - text: Your code should set the <code>matrix</code> variable to an array holding 3 rows of 2 columns of zeroes each.
-    testString: 'assert(JSON.stringify(matrix) == "[[0,0],[0,0],[0,0]]", "Your code should set the <code>matrix</code> variable to an array holding 3 rows of 2 columns of zeroes each.");'
+    testString: assert(JSON.stringify(matrix) == "[[0,0],[0,0],[0,0]]", 'Your code should set the <code>matrix</code> variable to an array holding 3 rows of 2 columns of zeroes each.');
   - text: The <code>matrix</code> variable should have 3 rows.
-    testString: 'assert(matrix.length == 3, "The <code>matrix</code> variable should have 3 rows.");'
+    testString: assert(matrix.length == 3, 'The <code>matrix</code> variable should have 3 rows.');
   - text: The <code>matrix</code> variable should have 2 columns in each row.
-    testString: 'assert(matrix[0].length == 2 && matrix[1].length === 2 && matrix[2].length === 2, "The <code>matrix</code> variable should have 2 columns in each row.");'
+    testString: assert(matrix[0].length == 2 && matrix[1].length === 2 && matrix[2].length === 2, 'The <code>matrix</code> variable should have 2 columns in each row.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-the-javascript-console-to-check-the-value-of-a-variable.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-the-javascript-console-to-check-the-value-of-a-variable.english.md
index c29b619f0f..858f058544 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-the-javascript-console-to-check-the-value-of-a-variable.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-the-javascript-console-to-check-the-value-of-a-variable.english.md
@@ -24,7 +24,7 @@ Use the <code>console.log()</code> method to print the value of the variable <co
 ```yml
 tests:
   - text: Your code should use <code>console.log()</code> to check the value of the variable <code>a</code>.
-    testString: 'assert(code.match(/console\.log\(a\)/g), "Your code should use <code>console.log()</code> to check the value of the variable <code>a</code>.");'
+    testString: assert(code.match(/console\.log\(a\)/g), 'Your code should use <code>console.log()</code> to check the value of the variable <code>a</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-typeof-to-check-the-type-of-a-variable.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-typeof-to-check-the-type-of-a-variable.english.md
index b865728bde..503e36be2c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-typeof-to-check-the-type-of-a-variable.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/debugging/use-typeof-to-check-the-type-of-a-variable.english.md
@@ -23,11 +23,11 @@ Add two <code>console.log()</code> statements to check the <code>typeof</code> e
 ```yml
 tests:
   - text: Your code should use <code>typeof</code> in two <code>console.log()</code> statements to check the type of the variables.
-    testString: 'assert(code.match(/console\.log\(typeof[\( ].*\)?\)/g).length == 2, "Your code should use <code>typeof</code> in two <code>console.log()</code> statements to check the type of the variables.");'
+    testString: assert(code.match(/console\.log\(typeof[\( ].*\)?\)/g).length == 2, 'Your code should use <code>typeof</code> in two <code>console.log()</code> statements to check the type of the variables.');
   - text: Your code should use <code>typeof</code> to check the type of the variable <code>seven</code>.
-    testString: 'assert(code.match(/typeof[\( ]seven\)?/g), "Your code should use <code>typeof</code> to check the type of the variable <code>seven</code>.");'
+    testString: assert(code.match(/typeof[\( ]seven\)?/g), 'Your code should use <code>typeof</code> to check the type of the variable <code>seven</code>.');
   - text: Your code should use <code>typeof</code> to check the type of the variable <code>three</code>.
-    testString: 'assert(code.match(/typeof[\( ]three\)?/g), "Your code should use <code>typeof</code> to check the type of the variable <code>three</code>.");'
+    testString: assert(code.match(/typeof[\( ]three\)?/g), 'Your code should use <code>typeof</code> to check the type of the variable <code>three</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords.english.md
index 0d8607f527..e92ff3cad9 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords.english.md
@@ -31,11 +31,11 @@ This exercise is designed to illustrate the difference between how <code>var</co
 ```yml
 tests:
   - text: <code>var</code> does not exist in code.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/var/g),"<code>var</code> does not exist in code.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/var/g),'<code>var</code> does not exist in code.');
   - text: The variable <code>i</code> declared in the if statement should equal "block scope".
-    testString: 'getUserInput => assert(getUserInput("index").match(/(i\s*=\s*).*\s*.*\s*.*\1("|")block\s*scope\2/g), "The variable <code>i</code> declared in the if statement should equal "block scope".");'
+    testString: getUserInput => assert(getUserInput('index').match(/(i\s*=\s*).*\s*.*\s*.*\1('|")block\s*scope\2/g), 'The variable <code>i</code> declared in the if statement should equal "block scope".');
   - text: <code>checkScope()</code> should return "function scope"
-    testString: 'assert(checkScope() === "function scope", "<code>checkScope()</code> should return "function scope"");'
+    testString: assert(checkScope() === "function scope", '<code>checkScope()</code> should return "function scope"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-an-export-fallback-with-export-default.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-an-export-fallback-with-export-default.english.md
index 25ad2cbcec..40cf714403 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-an-export-fallback-with-export-default.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-an-export-fallback-with-export-default.english.md
@@ -24,7 +24,7 @@ The following function should be the fallback value for the module. Please add t
 ```yml
 tests:
   - text: Proper used of <code>export</code> fallback.
-    testString: 'getUserInput => assert(getUserInput("index").match(/export\s+default\s+function\s+subtract\(x,y\)\s+{return\s+x\s-\s+y;}/g), "Proper used of <code>export</code> fallback.");'
+    testString: getUserInput => assert(getUserInput('index').match(/export\s+default\s+function\s+subtract\(x,y\)\s+{return\s+x\s-\s+y;}/g), 'Proper used of <code>export</code> fallback.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals.english.md
index d79b91e39c..0d357af135 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals.english.md
@@ -28,11 +28,11 @@ Use template literal syntax with backticks to display each entry of the <code>re
 ```yml
 tests:
   - text: <code>resultDisplayArray</code> is an array containing <code>result failure</code> messages.
-    testString: 'assert(typeof makeList(result.failure) === "object" && resultDisplayArray.length === 3, "<code>resultDisplayArray</code> is a list containing <code>result failure</code> messages.");'
+    testString: assert(typeof makeList(result.failure) === 'object' && resultDisplayArray.length === 3, '<code>resultDisplayArray</code> is a list containing <code>result failure</code> messages.');
   - text: <code>resultDisplayArray</code> is the desired output.
-    testString: 'assert(makeList(result.failure).every((v, i) => v === `<li class="text-warning">${result.failure[i]}</li>` || v === `<li class="text-warning">${result.failure[i]}</li>`), "<code>resultDisplayArray</code> is the desired output.");'
+    testString: assert(makeList(result.failure).every((v, i) => v === `<li class="text-warning">${result.failure[i]}</li>` || v === `<li class='text-warning'>${result.failure[i]}</li>`), '<code>resultDisplayArray</code> is the desired output.');
   - text: Template strings were used
-    testString: 'getUserInput => assert(getUserInput("index").match(/`.*`/g), "Template strings were not used");'
+    testString: getUserInput => assert(getUserInput('index').match(/`.*`/g), 'Template strings were not used');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/declare-a-read-only-variable-with-the-const-keyword.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/declare-a-read-only-variable-with-the-const-keyword.english.md
index 15acc1b027..d8c2e2aa5a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/declare-a-read-only-variable-with-the-const-keyword.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/declare-a-read-only-variable-with-the-const-keyword.english.md
@@ -23,13 +23,13 @@ Change the code so that all variables are declared using <code>let</code> or <co
 ```yml
 tests:
   - text: <code>var</code> does not exist in your code.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/var/g),"<code>var</code> does not exist in your code.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/var/g),'<code>var</code> does not exist in your code.');
   - text: <code>SENTENCE</code> should be a constant variable declared with <code>const</code>.
-    testString: 'getUserInput => assert(getUserInput("index").match(/(const SENTENCE)/g), "<code>SENTENCE</code> should be a constant variable declared with <code>const</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/(const SENTENCE)/g), '<code>SENTENCE</code> should be a constant variable declared with <code>const</code>.');
   - text: <code>i</code> should be declared with <code>let</code>.
-    testString: 'getUserInput => assert(getUserInput("index").match(/(let i)/g), "<code>i</code> should be declared with <code>let</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/(let i)/g), '<code>i</code> should be declared with <code>let</code>.');
   - text: <code>console.log</code> should be changed to print the <code>SENTENCE</code> variable.
-    testString: 'getUserInput => assert(getUserInput("index").match(/console\.log\(\s*SENTENCE\s*\)\s*;?/g), "<code>console.log</code> should be adjusted to print the variable <code>SENTENCE</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/console\.log\(\s*SENTENCE\s*\)\s*;?/g), '<code>console.log</code> should be adjusted to print the variable <code>SENTENCE</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords.english.md
index d2e4afcbdd..674f8a8da0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords.english.md
@@ -31,11 +31,11 @@ Update the code so it only uses the <code>let</code> keyword.
 ```yml
 tests:
   - text: <code>var</code> does not exist in code.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/var/g),"<code>var</code> does not exist in code.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/var/g),'<code>var</code> does not exist in code.');
   - text: <code>catName</code> should be <code>Oliver</code>.
-    testString: 'assert(catName === "Oliver", "<code>catName</code> should be <code>Oliver</code>.");'
+    testString: assert(catName === "Oliver", '<code>catName</code> should be <code>Oliver</code>.');
   - text: <code>quote</code> should be <code>"Oliver says Meow!"</code>
-    testString: 'assert(quote === "Oliver says Meow!", "<code>quote</code> should be <code>"Oliver says Meow!"</code>");'
+    testString: assert(quote === "Oliver says Meow!", '<code>quote</code> should be <code>"Oliver says Meow!"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/import-a-default-export.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/import-a-default-export.english.md
index ecc4c39e88..62016174c4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/import-a-default-export.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/import-a-default-export.english.md
@@ -23,7 +23,7 @@ In the following code, please import the default export, <code>subtract</code>,
 ```yml
 tests:
   - text: Properly imports <code>export default</code> method.
-    testString: 'getUserInput => assert(getUserInput("index").match(/import\s+subtract\s+from\s+"math_functions"/g), "Properly imports <code>export default</code> method.");'
+    testString: getUserInput => assert(getUserInput('index').match(/import\s+subtract\s+from\s+"math_functions"/g), 'Properly imports <code>export default</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/mutate-an-array-declared-with-const.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/mutate-an-array-declared-with-const.english.md
index c736951b59..13edda82fb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/mutate-an-array-declared-with-const.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/mutate-an-array-declared-with-const.english.md
@@ -24,13 +24,13 @@ An array is declared as <code>const s = [5, 7, 2]</code>. Change the array to <c
 ```yml
 tests:
   - text: Do not replace <code>const</code> keyword.
-    testString: 'getUserInput => assert(getUserInput("index").match(/const/g), "Do not replace <code>const</code> keyword.");'
+    testString: getUserInput => assert(getUserInput('index').match(/const/g), 'Do not replace <code>const</code> keyword.');
   - text: <code>s</code> should be a constant variable (by using <code>const</code>).
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+s/g), "<code>s</code> should be a constant variable (by using <code>const</code>).");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+s/g), '<code>s</code> should be a constant variable (by using <code>const</code>).');
   - text: Do not change the original array declaration.
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+s\s*=\s*\[\s*5\s*,\s*7\s*,\s*2\s*\]\s*;?/g), "Do not change the original array declaration.");'
-  - text: '<code>s</code> should be equal to <code>[2, 5, 7]</code>.'
-    testString: 'assert.deepEqual(s, [2, 5, 7], "<code>s</code> should be equal to <code>[2, 5, 7]</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+s\s*=\s*\[\s*5\s*,\s*7\s*,\s*2\s*\]\s*;?/g), 'Do not change the original array declaration.');
+  - text: <code>s</code> should be equal to <code>[2, 5, 7]</code>.
+    testString: assert.deepEqual(s, [2, 5, 7], '<code>s</code> should be equal to <code>[2, 5, 7]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/prevent-object-mutation.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/prevent-object-mutation.english.md
index 52bb629bf6..48d9ebfd33 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/prevent-object-mutation.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/prevent-object-mutation.english.md
@@ -22,13 +22,13 @@ In this challenge you are going to use <code>Object.freeze</code> to prevent mat
 ```yml
 tests:
   - text: Do not replace <code>const</code> keyword.
-    testString: 'getUserInput => assert(getUserInput("index").match(/const/g), "Do not replace <code>const</code> keyword.");'
+    testString: getUserInput => assert(getUserInput('index').match(/const/g), 'Do not replace <code>const</code> keyword.');
   - text: <code>MATH_CONSTANTS</code> should be a constant variable (by using <code>const</code>).
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+MATH_CONSTANTS/g), "<code>MATH_CONSTANTS</code> should be a constant variable (by using <code>const</code>).");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+MATH_CONSTANTS/g), '<code>MATH_CONSTANTS</code> should be a constant variable (by using <code>const</code>).');
   - text: Do not change original <code>MATH_CONSTANTS</code>.
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+MATH_CONSTANTS\s+=\s+{\s+PI:\s+3.14\s+};/g), "Do not change original <code>MATH_CONSTANTS</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+MATH_CONSTANTS\s+=\s+{\s+PI:\s+3.14\s+};/g), 'Do not change original <code>MATH_CONSTANTS</code>.');
   - text: <code>PI</code> equals <code>3.14</code>.
-    testString: 'assert(PI === 3.14, "<code>PI</code> equals <code>3.14</code>.");'
+    testString: assert(PI === 3.14, '<code>PI</code> equals <code>3.14</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/set-default-parameters-for-your-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/set-default-parameters-for-your-functions.english.md
index 7492a1e88d..79c53d3e1c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/set-default-parameters-for-your-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/set-default-parameters-for-your-functions.english.md
@@ -22,12 +22,12 @@ Modify the function <code>increment</code> by adding default parameters so that
 
 ```yml
 tests:
-  - text: 'The result of <code>increment(5, 2)</code> should be <code>7</code>.'
-    testString: 'assert(increment(5, 2) === 7, "The result of <code>increment(5, 2)</code> should be <code>7</code>.");'
+  - text: The result of <code>increment(5, 2)</code> should be <code>7</code>.
+    testString: assert(increment(5, 2) === 7, 'The result of <code>increment(5, 2)</code> should be <code>7</code>.');
   - text: The result of <code>increment(5)</code> should be <code>6</code>.
-    testString: 'assert(increment(5) === 6, "The result of <code>increment(5)</code> should be <code>6</code>.");'
+    testString: assert(increment(5) === 6, 'The result of <code>increment(5)</code> should be <code>6</code>.');
   - text: default parameter <code>1</code> was used for <code>value</code>.
-    testString: 'getUserInput => assert(getUserInput("index").match(/value\s*=\s*1/g), "default parameter <code>1</code> was used for <code>value</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/value\s*=\s*1/g), 'default parameter <code>1</code> was used for <code>value</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/understand-the-differences-between-import-and-require.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/understand-the-differences-between-import-and-require.english.md
index 2666bea4ea..c42ba794f0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/understand-the-differences-between-import-and-require.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/understand-the-differences-between-import-and-require.english.md
@@ -29,7 +29,7 @@ Add the appropriate <code>import</code> statement that will allow the current fi
 ```yml
 tests:
   - text: valid <code>import</code> statement
-    testString: 'getUserInput => assert(getUserInput("index").match(/import\s+\{\s*capitalizeString\s*\}\s+from\s+("|")string_functions\1/g), "valid <code>import</code> statement");'
+    testString: getUserInput => assert(getUserInput('index').match(/import\s+\{\s*capitalizeString\s*\}\s+from\s+("|')string_functions\1/g), 'valid <code>import</code> statement');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use--to-import-everything-from-a-file.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use--to-import-everything-from-a-file.english.md
index 0348e10507..4c636e6833 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use--to-import-everything-from-a-file.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use--to-import-everything-from-a-file.english.md
@@ -25,7 +25,7 @@ The code below requires the contents of a file, <code>"capitalize_strings"</code
 ```yml
 tests:
   - text: Properly uses <code>import * as</code> syntax.
-    testString: 'assert(code.match(/import\s+\*\s+as\s+[a-zA-Z0-9_$]+\s+from\s*"\s*capitalize_strings\s*"\s*;/gi), "Properly uses <code>import * as</code> syntax.");'
+    testString: assert(code.match(/import\s+\*\s+as\s+[a-zA-Z0-9_$]+\s+from\s*"\s*capitalize_strings\s*"\s*;/gi), 'Properly uses <code>import * as</code> syntax.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-arrow-functions-to-write-concise-anonymous-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-arrow-functions-to-write-concise-anonymous-functions.english.md
index 3843ab8cfb..46bdf11905 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-arrow-functions-to-write-concise-anonymous-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-arrow-functions-to-write-concise-anonymous-functions.english.md
@@ -27,15 +27,15 @@ Rewrite the function assigned to the variable <code>magic</code> which returns a
 ```yml
 tests:
   - text: User did replace <code>var</code> keyword.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/var/g), "User did replace <code>var</code> keyword.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/var/g), 'User did replace <code>var</code> keyword.');
   - text: <code>magic</code> should be a constant variable (by using <code>const</code>).
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+magic/g), "<code>magic</code> should be a constant variable (by using <code>const</code>).");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+magic/g), '<code>magic</code> should be a constant variable (by using <code>const</code>).');
   - text: <code>magic</code> is a <code>function</code>.
-    testString: 'assert(typeof magic === "function", "<code>magic</code> is a <code>function</code>.");'
+    testString: assert(typeof magic === 'function', '<code>magic</code> is a <code>function</code>.');
   - text: <code>magic()</code> returns correct date.
-    testString: 'assert(magic().getDate() == new Date().getDate(), "<code>magic()</code> returns correct date.");'
+    testString: assert(magic().getDate() == new Date().getDate(), '<code>magic()</code> returns correct date.');
   - text: <code>function</code> keyword was not used.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/function/g), "<code>function</code> keyword was not used.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/function/g), '<code>function</code> keyword was not used.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-class-syntax-to-define-a-constructor-function.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-class-syntax-to-define-a-constructor-function.english.md
index 0f82ef6255..73c68af66e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-class-syntax-to-define-a-constructor-function.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-class-syntax-to-define-a-constructor-function.english.md
@@ -27,13 +27,13 @@ The <code>Vegetable</code> lets you create a vegetable object, with a property <
 ```yml
 tests:
   - text: <code>Vegetable</code> should be a <code>class</code> with a defined <code>constructor</code> method.
-    testString: 'assert(typeof Vegetable === "function" && typeof Vegetable.constructor === "function", "<code>Vegetable</code> should be a <code>class</code> with a defined <code>constructor</code> method.");'
+    testString: assert(typeof Vegetable === 'function' && typeof Vegetable.constructor === 'function', '<code>Vegetable</code> should be a <code>class</code> with a defined <code>constructor</code> method.');
   - text: <code>class</code> keyword was used.
-    testString: 'getUserInput => assert(getUserInput("index").match(/class/g),"<code>class</code> keyword was used.");'
+    testString: getUserInput => assert(getUserInput('index').match(/class/g),'<code>class</code> keyword was used.');
   - text: <code>Vegetable</code> can be instantiated.
-    testString: 'assert(() => {const a = new Vegetable("apple"); return typeof a === "object";},"<code>Vegetable</code> can be instantiated.");'
+    testString: assert(() => {const a = new Vegetable("apple"); return typeof a === 'object';},'<code>Vegetable</code> can be instantiated.');
   - text: <code>carrot.name</code> should return <code>carrot</code>.
-    testString: 'assert(carrot.name=="carrot","<code>carrot.name</code> should return <code>carrot</code>.");'
+    testString: assert(carrot.name=='carrot','<code>carrot.name</code> should return <code>carrot</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-arrays.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-arrays.english.md
index ef385a7568..15077042c4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-arrays.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-arrays.english.md
@@ -25,12 +25,12 @@ Use destructuring assignment to swap the values of <code>a</code> and <code>b</c
 
 ```yml
 tests:
-  - text: 'Value of <code>a</code> should be 6, after swapping.'
-    testString: 'assert(a === 6, "Value of <code>a</code> should be 6, after swapping.");'
-  - text: 'Value of <code>b</code> should be 8, after swapping.'
-    testString: 'assert(b === 8, "Value of <code>b</code> should be 8, after swapping.");'
+  - text: Value of <code>a</code> should be 6, after swapping.
+    testString: assert(a === 6, 'Value of <code>a</code> should be 6, after swapping.');
+  - text: Value of <code>b</code> should be 8, after swapping.
+    testString: assert(b === 8, 'Value of <code>b</code> should be 8, after swapping.');
   - text: Use array destructuring to swap a and b.
-    testString: '// assert(/\[\s*(\w)\s*,\s*(\w)\s*\]\s*=\s*\[\s*\2\s*,\s*\1\s*\]/g.test(code), "Use array destructuring to swap a and b.");'
+    testString: // assert(/\[\s*(\w)\s*,\s*(\w)\s*\]\s*=\s*\[\s*\2\s*,\s*\1\s*\]/g.test(code), 'Use array destructuring to swap a and b.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-nested-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-nested-objects.english.md
index 48e1d122ea..f1ed46084f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-nested-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-nested-objects.english.md
@@ -23,9 +23,9 @@ Use destructuring assignment to obtain <code>max</code> of <code>forecast.tomorr
 ```yml
 tests:
   - text: <code>maxOfTomorrow</code> equals <code>84.6</code>
-    testString: 'assert(getMaxOfTmrw(LOCAL_FORECAST) === 84.6, "<code>maxOfTomorrow</code> equals <code>84.6</code>");'
+    testString: assert(getMaxOfTmrw(LOCAL_FORECAST) === 84.6, '<code>maxOfTomorrow</code> equals <code>84.6</code>');
   - text: nested destructuring was used
-    testString: 'getUserInput => assert(getUserInput("index").match(/\{\s*tomorrow\s*:\s*\{\s*max\s*:\s*maxOfTomorrow\s*\}\s*\}\s*=\s*forecast/g),"nested destructuring was used");'
+    testString: getUserInput => assert(getUserInput('index').match(/\{\s*tomorrow\s*:\s*\{\s*max\s*:\s*maxOfTomorrow\s*\}\s*\}\s*=\s*forecast/g),'nested destructuring was used');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-objects.english.md
index fd0d8a5856..9da20cdb06 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-assign-variables-from-objects.english.md
@@ -28,9 +28,9 @@ Use destructuring to obtain the average temperature for tomorrow from the input
 ```yml
 tests:
   - text: <code>getTempOfTmrw(AVG_TEMPERATURES)</code> should be <code>79</code>
-    testString: 'assert(getTempOfTmrw(AVG_TEMPERATURES) === 79, "<code>getTempOfTmrw(AVG_TEMPERATURES)</code> should be <code>79</code>");'
+    testString: assert(getTempOfTmrw(AVG_TEMPERATURES) === 79, '<code>getTempOfTmrw(AVG_TEMPERATURES)</code> should be <code>79</code>');
   - text: destructuring with reassignment was used
-    testString: 'getUserInput => assert(getUserInput("index").match(/\{\s*tomorrow\s*:\s*tempOfTomorrow\s*}\s*=\s*avgTemperatures/g),"destructuring with reassignment was used");'
+    testString: getUserInput => assert(getUserInput('index').match(/\{\s*tomorrow\s*:\s*tempOfTomorrow\s*}\s*=\s*avgTemperatures/g),'destructuring with reassignment was used');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters.english.md
index 51e8384119..fe204276a8 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters.english.md
@@ -26,11 +26,11 @@ Use destructuring assignment within the argument to the function <code>half</cod
 ```yml
 tests:
   - text: <code>stats</code> should be an <code>object</code>.
-    testString: 'assert(typeof stats === "object", "<code>stats</code> should be an <code>object</code>.");'
+    testString: assert(typeof stats === 'object', '<code>stats</code> should be an <code>object</code>.');
   - text: <code>half(stats)</code> should be <code>28.015</code>
-    testString: 'assert(half(stats) === 28.015, "<code>half(stats)</code> should be <code>28.015</code>");'
+    testString: assert(half(stats) === 28.015, '<code>half(stats)</code> should be <code>28.015</code>');
   - text: Destructuring was used.
-    testString: 'getUserInput => assert(getUserInput("index").match(/\(\s*\{\s*\w+\s*,\s*\w+\s*\}\s*\)/g), "Destructuring was used.");'
+    testString: getUserInput => assert(getUserInput('index').match(/\(\s*\{\s*\w+\s*,\s*\w+\s*\}\s*\)/g), 'Destructuring was used.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements.english.md
index 1734630cf7..437aafef83 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements.english.md
@@ -23,12 +23,12 @@ Use destructuring assignment with the rest operator to perform an effective <cod
 
 ```yml
 tests:
-  - text: '<code>arr</code> should be <code>[3,4,5,6,7,8,9,10]</code>'
-    testString: 'assert(arr.every((v, i) => v === i + 3) && arr.length === 8,"<code>arr</code> should be <code>[3,4,5,6,7,8,9,10]</code>");'
+  - text: <code>arr</code> should be <code>[3,4,5,6,7,8,9,10]</code>
+    testString: assert(arr.every((v, i) => v === i + 3) && arr.length === 8,'<code>arr</code> should be <code>[3,4,5,6,7,8,9,10]</code>');
   - text: Destructuring should be used.
-    testString: 'getUserInput => assert(getUserInput("index").match(/\[\s*\w*\s*,\s*\w*\s*,\s*...\w+\s*\]/g),"Destructuring should be used.");'
+    testString: getUserInput => assert(getUserInput('index').match(/\[\s*\w*\s*,\s*\w*\s*,\s*...\w+\s*\]/g),'Destructuring should be used.');
   - text: <code>Array.slice()</code> should not be used.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/slice/g), "<code>Array.slice()</code> should not be used.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/slice/g), '<code>Array.slice()</code> should not be used.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-export-to-reuse-a-code-block.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-export-to-reuse-a-code-block.english.md
index 5f3e5c6d35..5c242f9bab 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-export-to-reuse-a-code-block.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-export-to-reuse-a-code-block.english.md
@@ -25,9 +25,9 @@ Below are two variables that I want to make available for other files to use. Ut
 ```yml
 tests:
   - text: <code>foo</code> is exported.
-    testString: 'getUserInput => assert(getUserInput("index").match(/export\s+const\s+foo\s*=\s*"bar"/g), "<code>foo</code> is exported.");'
+    testString: getUserInput => assert(getUserInput('index').match(/export\s+const\s+foo\s*=\s*"bar"/g), '<code>foo</code> is exported.');
   - text: <code>bar</code> is exported.
-    testString: 'getUserInput => assert(getUserInput("index").match(/export\s+const\s+bar\s*=\s*"foo"/g), "<code>bar</code> is exported.");'
+    testString: getUserInput => assert(getUserInput('index').match(/export\s+const\s+bar\s*=\s*"foo"/g), '<code>bar</code> is exported.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-getters-and-setters-to-control-access-to-an-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-getters-and-setters-to-control-access-to-an-object.english.md
index 183917d34d..fc793cc0d5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-getters-and-setters-to-control-access-to-an-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-getters-and-setters-to-control-access-to-an-object.english.md
@@ -32,11 +32,11 @@ In other words, you are abstracting implementation details from the consumer.
 ```yml
 tests:
   - text: <code>Thermostat</code> should be a <code>class</code> with a defined <code>constructor</code> method.
-    testString: 'assert(typeof Thermostat === "function" && typeof Thermostat.constructor === "function","<code>Thermostat</code> should be a <code>class</code> with a defined <code>constructor</code> method.");'
+    testString: assert(typeof Thermostat === 'function' && typeof Thermostat.constructor === 'function','<code>Thermostat</code> should be a <code>class</code> with a defined <code>constructor</code> method.');
   - text: <code>class</code> keyword was used.
-    testString: 'getUserInput => assert(getUserInput("index").match(/class/g),"<code>class</code> keyword was used.");'
+    testString: getUserInput => assert(getUserInput('index').match(/class/g),'<code>class</code> keyword was used.');
   - text: <code>Thermostat</code> can be instantiated.
-    testString: 'assert(() => {const t = new Thermostat(32); return typeof t === "object" && t.temperature === 0;}, "<code>Thermostat</code> can be instantiated.");'
+    testString: assert(() => {const t = new Thermostat(32); return typeof t === 'object' && t.temperature === 0;}, '<code>Thermostat</code> can be instantiated.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-rest-operator-with-function-parameters.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-rest-operator-with-function-parameters.english.md
index fbd70a74a1..c541f35d3a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-rest-operator-with-function-parameters.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-rest-operator-with-function-parameters.english.md
@@ -22,16 +22,16 @@ Modify the function <code>sum</code> so that it uses the rest operator and it wo
 
 ```yml
 tests:
-  - text: 'The result of <code>sum(0,1,2)</code> should be 3'
-    testString: 'assert(sum(0,1,2) === 3, "The result of <code>sum(0,1,2)</code> should be 3");'
-  - text: 'The result of <code>sum(1,2,3,4)</code> should be 10'
-    testString: 'assert(sum(1,2,3,4) === 10, "The result of <code>sum(1,2,3,4)</code> should be 10");'
+  - text: The result of <code>sum(0,1,2)</code> should be 3
+    testString: assert(sum(0,1,2) === 3, 'The result of <code>sum(0,1,2)</code> should be 3');
+  - text: The result of <code>sum(1,2,3,4)</code> should be 10
+    testString: assert(sum(1,2,3,4) === 10, 'The result of <code>sum(1,2,3,4)</code> should be 10');
   - text: The result of <code>sum(5)</code> should be 5
-    testString: 'assert(sum(5) === 5, "The result of <code>sum(5)</code> should be 5");'
+    testString: assert(sum(5) === 5, 'The result of <code>sum(5)</code> should be 5');
   - text: The result of <code>sum()</code> should be 0
-    testString: 'assert(sum() === 0, "The result of <code>sum()</code> should be 0");'
+    testString: assert(sum() === 0, 'The result of <code>sum()</code> should be 0');
   - text: The <code>sum</code> function uses the <code>...</code> spread operator on the <code>args</code> parameter.
-    testString: 'getUserInput => assert(getUserInput("index").match(/function\s+sum\s*\(\s*...args\s*\)\s*{/g), "The <code>sum</code> function uses the <code>...</code> spread operator on the <code>args</code> parameter.");'
+    testString: getUserInput => assert(getUserInput('index').match(/function\s+sum\s*\(\s*...args\s*\)\s*{/g), 'The <code>sum</code> function uses the <code>...</code> spread operator on the <code>args</code> parameter.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-spread-operator-to-evaluate-arrays-in-place.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-spread-operator-to-evaluate-arrays-in-place.english.md
index 43bce73e63..3003f68b96 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-spread-operator-to-evaluate-arrays-in-place.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-spread-operator-to-evaluate-arrays-in-place.english.md
@@ -28,11 +28,11 @@ Copy all contents of <code>arr1</code> into another array <code>arr2</code> usin
 ```yml
 tests:
   - text: <code>arr2</code> is correct copy of <code>arr1</code>.
-    testString: 'assert(arr2.every((v, i) => v === arr1[i]), "<code>arr2</code> is correct copy of <code>arr1</code>.");'
+    testString: assert(arr2.every((v, i) => v === arr1[i]), '<code>arr2</code> is correct copy of <code>arr1</code>.');
   - text: <code>...</code> spread operator was used to duplicate <code>arr1</code>.
-    testString: 'getUserInput => assert(getUserInput("index").match(/\[\s*...arr1\s*\]/g),"<code>...</code> spread operator was used to duplicate <code>arr1</code>.");'
+    testString: getUserInput => assert(getUserInput('index').match(/\[\s*...arr1\s*\]/g),'<code>...</code> spread operator was used to duplicate <code>arr1</code>.');
   - text: <code>arr2</code> remains unchanged when <code>arr1</code> is changed.
-    testString: 'assert((arr1, arr2) => {arr1.push("JUN"); return arr2.length < arr1.length},"<code>arr2</code> remains unchanged when <code>arr1</code> is changed.");'
+    testString: assert((arr1, arr2) => {arr1.push('JUN'); return arr2.length < arr1.length},'<code>arr2</code> remains unchanged when <code>arr1</code> is changed.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters.english.md
index 13000aa695..346c1f341f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-arrow-functions-with-parameters.english.md
@@ -22,15 +22,15 @@ Rewrite the <code>myConcat</code> function which appends contents of <code>arr2<
 ```yml
 tests:
   - text: User did replace <code>var</code> keyword.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/var/g), "User did replace <code>var</code> keyword.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/var/g), 'User did replace <code>var</code> keyword.');
   - text: <code>myConcat</code> should be a constant variable (by using <code>const</code>).
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+myConcat/g), "<code>myConcat</code> should be a constant variable (by using <code>const</code>).");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+myConcat/g), '<code>myConcat</code> should be a constant variable (by using <code>const</code>).');
   - text: <code>myConcat</code> should be a function
-    testString: 'assert(typeof myConcat === "function", "<code>myConcat</code> should be a function");'
+    testString: assert(typeof myConcat === 'function', '<code>myConcat</code> should be a function');
   - text: <code>myConcat()</code> returns the correct <code>array</code>
-    testString: 'assert(() => { const a = myConcat([1], [2]); return a[0] == 1 && a[1] == 2; }, "<code>myConcat()</code> returns the correct <code>array</code>");'
+    testString: assert(() => { const a = myConcat([1], [2]); return a[0] == 1 && a[1] == 2; }, '<code>myConcat()</code> returns the correct <code>array</code>');
   - text: <code>function</code> keyword was not used.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/function/g), "<code>function</code> keyword was not used.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/function/g), '<code>function</code> keyword was not used.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.english.md
index c6afafa874..f5a4a88c82 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.english.md
@@ -23,11 +23,11 @@ Refactor the function <code>setGear</code> inside the object <code>bicycle</code
 ```yml
 tests:
   - text: Traditional function expression was not used.
-    testString: 'assert(!getUserInput("index").match(/function/),"Traditional <code>function</code> expression was not used.");'
+    testString: assert(!getUserInput('index').match(/function/),'Traditional <code>function</code> expression was not used.');
   - text: <code>setGear</code> is a declarative function.
-    testString: 'assert(typeof bicycle.setGear === "function" && getUserInput("index").match(/setGear\s*\(.+\)\s*\{/), "<code>setGear</code> is a declarative function.");'
+    testString: assert(typeof bicycle.setGear === 'function' && getUserInput('index').match(/setGear\s*\(.+\)\s*\{/), '<code>setGear</code> is a declarative function.');
   - text: <code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.
-    testString: 'assert((new bicycle.setGear(48)).gear === 48, "<code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.");'
+    testString: assert((new bicycle.setGear(48)).gear === 48, '<code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-object-literal-declarations-using-simple-fields.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-object-literal-declarations-using-simple-fields.english.md
index b1267658fc..726a86a6ee 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-object-literal-declarations-using-simple-fields.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-object-literal-declarations-using-simple-fields.english.md
@@ -26,9 +26,9 @@ Use simple fields with object literals to create and return a <code>Person</code
 ```yml
 tests:
   - text: 'the output is <code>{name: "Zodiac Hasbro", age: 56, gender: "male"}</code>.'
-    testString: 'assert(() => {const res={name:"Zodiac Hasbro",age:56,gender:"male"}; const person=createPerson("Zodiac Hasbro", 56, "male"); return Object.keys(person).every(k => person[k] === res[k]);}, "the output is <code>{name: "Zodiac Hasbro", age: 56, gender: "male"}</code>.");'
-  - text: 'No <code>:</code> were used.'
-    testString: 'getUserInput => assert(!getUserInput("index").match(/:/g), "No <code>:</code> were used.");'
+    testString: 'assert(() => {const res={name:"Zodiac Hasbro",age:56,gender:"male"}; const person=createPerson("Zodiac Hasbro", 56, "male"); return Object.keys(person).every(k => person[k] === res[k]);}, ''the output is <code>{name: "Zodiac Hasbro", age: 56, gender: "male"}</code>.'');'
+  - text: No <code>:</code> were used.
+    testString: getUserInput => assert(!getUserInput('index').match(/:/g), 'No <code>:</code> were used.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-higher-order-arrow-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-higher-order-arrow-functions.english.md
index 2b9c03fada..b4e174aa1d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-higher-order-arrow-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-higher-order-arrow-functions.english.md
@@ -26,17 +26,17 @@ Use arrow function syntax to compute the square of only the positive integers (d
 ```yml
 tests:
   - text: <code>squaredIntegers</code> should be a constant variable (by using <code>const</code>).
-    testString: 'getUserInput => assert(getUserInput("index").match(/const\s+squaredIntegers/g), "<code>squaredIntegers</code> should be a constant variable (by using <code>const</code>).");'
+    testString: getUserInput => assert(getUserInput('index').match(/const\s+squaredIntegers/g), '<code>squaredIntegers</code> should be a constant variable (by using <code>const</code>).');
   - text: <code>squaredIntegers</code> should be an <code>array</code>
-    testString: 'assert(Array.isArray(squaredIntegers), "<code>squaredIntegers</code> should be an <code>array</code>");'
-  - text: '<code>squaredIntegers</code> should be <code>[16, 1764, 36]</code>'
-    testString: 'assert.deepStrictEqual(squaredIntegers, [16, 1764, 36], "<code>squaredIntegers</code> should be <code>[16, 1764, 36]</code>");'
+    testString: assert(Array.isArray(squaredIntegers), '<code>squaredIntegers</code> should be an <code>array</code>');
+  - text: <code>squaredIntegers</code> should be <code>[16, 1764, 36]</code>
+    testString: assert.deepStrictEqual(squaredIntegers, [16, 1764, 36], '<code>squaredIntegers</code> should be <code>[16, 1764, 36]</code>');
   - text: <code>function</code> keyword was not used.
-    testString: 'getUserInput => assert(!getUserInput("index").match(/function/g), "<code>function</code> keyword was not used.");'
+    testString: getUserInput => assert(!getUserInput('index').match(/function/g), '<code>function</code> keyword was not used.');
   - text: loop should not be used
-    testString: 'getUserInput => assert(!getUserInput("index").match(/(for)|(while)/g), "loop should not be used");'
-  - text: '<code>map</code>, <code>filter</code>, or <code>reduce</code> should be used'
-    testString: 'getUserInput => assert(getUserInput("index").match(/map|filter|reduce/g), "<code>map</code>, <code>filter</code>, or <code>reduce</code> should be used");'
+    testString: getUserInput => assert(!getUserInput('index').match(/(for)|(while)/g), 'loop should not be used');
+  - text: <code>map</code>, <code>filter</code>, or <code>reduce</code> should be used
+    testString: getUserInput => assert(getUserInput('index').match(/map|filter|reduce/g), '<code>map</code>, <code>filter</code>, or <code>reduce</code> should be used');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/add-elements-to-the-end-of-an-array-using-concat-instead-of-push.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/add-elements-to-the-end-of-an-array-using-concat-instead-of-push.english.md
index 90d56c8775..b581f9ca81 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/add-elements-to-the-end-of-an-array-using-concat-instead-of-push.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/add-elements-to-the-end-of-an-array-using-concat-instead-of-push.english.md
@@ -23,15 +23,15 @@ Change the <code>nonMutatingPush</code> function so it uses <code>concat</code>
 ```yml
 tests:
   - text: Your code should use the <code>concat</code> method.
-    testString: 'assert(code.match(/\.concat/g), "Your code should use the <code>concat</code> method.");'
+    testString: assert(code.match(/\.concat/g), 'Your code should use the <code>concat</code> method.');
   - text: Your code should not use the <code>push</code> method.
-    testString: 'assert(!code.match(/\.push/g), "Your code should not use the <code>push</code> method.");'
+    testString: assert(!code.match(/\.push/g), 'Your code should not use the <code>push</code> method.');
   - text: The <code>first</code> array should not change.
-    testString: 'assert(JSON.stringify(first) === JSON.stringify([1, 2, 3]), "The <code>first</code> array should not change.");'
+    testString: assert(JSON.stringify(first) === JSON.stringify([1, 2, 3]), 'The <code>first</code> array should not change.');
   - text: The <code>second</code> array should not change.
-    testString: 'assert(JSON.stringify(second) === JSON.stringify([4, 5]), "The <code>second</code> array should not change.");'
-  - text: '<code>nonMutatingPush([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.'
-    testString: 'assert(JSON.stringify(nonMutatingPush([1, 2, 3], [4, 5])) === JSON.stringify([1, 2, 3, 4, 5]), "<code>nonMutatingPush([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.");'
+    testString: assert(JSON.stringify(second) === JSON.stringify([4, 5]), 'The <code>second</code> array should not change.');
+  - text: <code>nonMutatingPush([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.
+    testString: assert(JSON.stringify(nonMutatingPush([1, 2, 3], [4, 5])) === JSON.stringify([1, 2, 3, 4, 5]), '<code>nonMutatingPush([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/apply-functional-programming-to-convert-strings-to-url-slugs.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/apply-functional-programming-to-convert-strings-to-url-slugs.english.md
index 8f13993b48..a963eff6a3 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/apply-functional-programming-to-convert-strings-to-url-slugs.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/apply-functional-programming-to-convert-strings-to-url-slugs.english.md
@@ -26,17 +26,17 @@ The output should not have any spaces
 ```yml
 tests:
   - text: The <code>globalTitle</code> variable should not change.
-    testString: 'assert(globalTitle === "Winter Is Coming", "The <code>globalTitle</code> variable should not change.");'
+    testString: assert(globalTitle === "Winter Is Coming", 'The <code>globalTitle</code> variable should not change.');
   - text: Your code should not use the <code>replace</code> method for this challenge.
-    testString: 'assert(!code.match(/\.replace/g), "Your code should not use the <code>replace</code> method for this challenge.");'
+    testString: assert(!code.match(/\.replace/g), 'Your code should not use the <code>replace</code> method for this challenge.');
   - text: <code>urlSlug("Winter Is Coming")</code> should return <code>"winter-is-coming"</code>.
-    testString: 'assert(urlSlug("Winter Is Coming") === "winter-is-coming", "<code>urlSlug("Winter Is Coming")</code> should return <code>"winter-is-coming"</code>.");'
+    testString: assert(urlSlug("Winter Is Coming") === "winter-is-coming", '<code>urlSlug("Winter Is Coming")</code> should return <code>"winter-is-coming"</code>.');
   - text: <code>urlSlug(" Winter Is  &nbsp;Coming")</code> should return <code>"winter-is-coming"</code>.
-    testString: 'assert(urlSlug(" Winter Is  Coming") === "winter-is-coming", "<code>urlSlug(" Winter Is  &nbsp;Coming")</code> should return <code>"winter-is-coming"</code>.");'
+    testString: assert(urlSlug(" Winter Is  Coming") === "winter-is-coming", '<code>urlSlug(" Winter Is  &nbsp;Coming")</code> should return <code>"winter-is-coming"</code>.');
   - text: <code>urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone")</code> should return <code>"a-mind-needs-books-like-a-sword-needs-a-whetstone"</code>.
-    testString: 'assert(urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone") === "a-mind-needs-books-like-a-sword-needs-a-whetstone", "<code>urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone")</code> should return <code>"a-mind-needs-books-like-a-sword-needs-a-whetstone"</code>.");'
+    testString: assert(urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone") === "a-mind-needs-books-like-a-sword-needs-a-whetstone", '<code>urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone")</code> should return <code>"a-mind-needs-books-like-a-sword-needs-a-whetstone"</code>.');
   - text: <code>urlSlug("Hold The Door")</code> should return <code>"hold-the-door"</code>.
-    testString: 'assert(urlSlug("Hold The Door") === "hold-the-door", "<code>urlSlug("Hold The Door")</code> should return <code>"hold-the-door"</code>.");'
+    testString: assert(urlSlug("Hold The Door") === "hold-the-door", '<code>urlSlug("Hold The Door")</code> should return <code>"hold-the-door"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/avoid-mutations-and-side-effects-using-functional-programming.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/avoid-mutations-and-side-effects-using-functional-programming.english.md
index 0fb12bd216..a0a0a7f2c6 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/avoid-mutations-and-side-effects-using-functional-programming.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/avoid-mutations-and-side-effects-using-functional-programming.english.md
@@ -25,9 +25,9 @@ Fill in the code for the function <code>incrementer</code> so it returns the val
 ```yml
 tests:
   - text: Your function <code>incrementer</code> should not change the value of <code>fixedValue</code>.
-    testString: 'assert(fixedValue === 4, "Your function <code>incrementer</code> should not change the value of <code>fixedValue</code>.");'
+    testString: assert(fixedValue === 4, 'Your function <code>incrementer</code> should not change the value of <code>fixedValue</code>.');
   - text: Your <code>incrementer</code> function should return a value that is one larger than the <code>fixedValue</code> value.
-    testString: 'assert(newValue === 5, "Your <code>incrementer</code> function should return a value that is one larger than the <code>fixedValue</code> value.");'
+    testString: assert(newValue === 5, 'Your <code>incrementer</code> function should return a value that is one larger than the <code>fixedValue</code> value.');
 
 ```
 
@@ -68,5 +68,7 @@ var fixedValue = 4
 function incrementer() {
   return fixedValue + 1
 }
+
+var newValue = incrementer(); // Should equal 5
 ```
 </section>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-an-array-into-a-string-using-the-join-method.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-an-array-into-a-string-using-the-join-method.english.md
index 034acd1ffc..cc1cb61bef 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-an-array-into-a-string-using-the-join-method.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-an-array-into-a-string-using-the-join-method.english.md
@@ -22,17 +22,17 @@ Use the <code>join</code> method (among others) inside the <code>sentensify</cod
 ```yml
 tests:
   - text: Your code should use the <code>join</code> method.
-    testString: 'assert(code.match(/\.join/g), "Your code should use the <code>join</code> method.");'
+    testString: assert(code.match(/\.join/g), 'Your code should use the <code>join</code> method.');
   - text: Your code should not use the <code>replace</code> method.
-    testString: 'assert(!code.match(/\.replace/g), "Your code should not use the <code>replace</code> method.");'
+    testString: assert(!code.match(/\.replace/g), 'Your code should not use the <code>replace</code> method.');
   - text: <code>sentensify("May-the-force-be-with-you")</code> should return a string.
-    testString: 'assert(typeof sentensify("May-the-force-be-with-you") === "string", "<code>sentensify("May-the-force-be-with-you")</code> should return a string.");'
+    testString: assert(typeof sentensify("May-the-force-be-with-you") === "string", '<code>sentensify("May-the-force-be-with-you")</code> should return a string.');
   - text: <code>sentensify("May-the-force-be-with-you")</code> should return <code>"May the force be with you"</code>.
-    testString: 'assert(sentensify("May-the-force-be-with-you") === "May the force be with you", "<code>sentensify("May-the-force-be-with-you")</code> should return <code>"May the force be with you"</code>.");'
+    testString: assert(sentensify("May-the-force-be-with-you") === "May the force be with you", '<code>sentensify("May-the-force-be-with-you")</code> should return <code>"May the force be with you"</code>.');
   - text: <code>sentensify("The.force.is.strong.with.this.one")</code> should return <code>"The force is strong with this one"</code>.
-    testString: 'assert(sentensify("The.force.is.strong.with.this.one") === "The force is strong with this one", "<code>sentensify("The.force.is.strong.with.this.one")</code> should return <code>"The force is strong with this one"</code>.");'
-  - text: '<code>sentensify("There,has,been,an,awakening")</code> should return <code>"There has been an awakening"</code>.'
-    testString: 'assert(sentensify("There,has,been,an,awakening") === "There has been an awakening", "<code>sentensify("There,has,been,an,awakening")</code> should return <code>"There has been an awakening"</code>.");'
+    testString: assert(sentensify("The.force.is.strong.with.this.one") === "The force is strong with this one", '<code>sentensify("The.force.is.strong.with.this.one")</code> should return <code>"The force is strong with this one"</code>.');
+  - text: <code>sentensify("There,has,been,an,awakening")</code> should return <code>"There has been an awakening"</code>.
+    testString: assert(sentensify("There,has,been,an,awakening") === "There has been an awakening", '<code>sentensify("There,has,been,an,awakening")</code> should return <code>"There has been an awakening"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-two-arrays-using-the-concat-method.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-two-arrays-using-the-concat-method.english.md
index 16d402d84c..a90ff5592b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-two-arrays-using-the-concat-method.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/combine-two-arrays-using-the-concat-method.english.md
@@ -21,13 +21,13 @@ Use the <code>concat</code> method in the <code>nonMutatingConcat</code> functio
 ```yml
 tests:
   - text: Your code should use the <code>concat</code> method.
-    testString: 'assert(code.match(/\.concat/g), "Your code should use the <code>concat</code> method.");'
+    testString: assert(code.match(/\.concat/g), 'Your code should use the <code>concat</code> method.');
   - text: The <code>first</code> array should not change.
-    testString: 'assert(JSON.stringify(first) === JSON.stringify([1, 2, 3]), "The <code>first</code> array should not change.");'
+    testString: assert(JSON.stringify(first) === JSON.stringify([1, 2, 3]), 'The <code>first</code> array should not change.');
   - text: The <code>second</code> array should not change.
-    testString: 'assert(JSON.stringify(second) === JSON.stringify([4, 5]), "The <code>second</code> array should not change.");'
-  - text: '<code>nonMutatingConcat([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.'
-    testString: 'assert(JSON.stringify(nonMutatingConcat([1, 2, 3], [4, 5])) === JSON.stringify([1, 2, 3, 4, 5]), "<code>nonMutatingConcat([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.");'
+    testString: assert(JSON.stringify(second) === JSON.stringify([4, 5]), 'The <code>second</code> array should not change.');
+  - text: <code>nonMutatingConcat([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.
+    testString: assert(JSON.stringify(nonMutatingConcat([1, 2, 3], [4, 5])) === JSON.stringify([1, 2, 3, 4, 5]), '<code>nonMutatingConcat([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-map-on-a-prototype.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-map-on-a-prototype.english.md
index b87ec2f05f..0fdd0fc2b2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-map-on-a-prototype.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-map-on-a-prototype.english.md
@@ -22,10 +22,10 @@ Write your own <code>Array.prototype.myMap()</code>, which should behave exactly
 
 ```yml
 tests:
-  - text: '<code>new_s</code> should equal <code>[46, 130, 196, 10]</code>.'
-    testString: 'assert(JSON.stringify(new_s) === JSON.stringify([46, 130, 196, 10]), "<code>new_s</code> should equal <code>[46, 130, 196, 10]</code>.");'
+  - text: <code>new_s</code> should equal <code>[46, 130, 196, 10]</code>.
+    testString: assert(JSON.stringify(new_s) === JSON.stringify([46, 130, 196, 10]), '<code>new_s</code> should equal <code>[46, 130, 196, 10]</code>.');
   - text: Your code should not use the <code>map</code> method.
-    testString: 'assert(!code.match(/\.map/g), "Your code should not use the <code>map</code> method.");'
+    testString: assert(!code.match(/\.map/g), 'Your code should not use the <code>map</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-the-filter-method-on-a-prototype.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-the-filter-method-on-a-prototype.english.md
index 474caa8249..7c7285ff8e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-the-filter-method-on-a-prototype.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/implement-the-filter-method-on-a-prototype.english.md
@@ -20,10 +20,10 @@ Write your own <code>Array.prototype.myFilter()</code>, which should behave exac
 
 ```yml
 tests:
-  - text: '<code>new_s</code> should equal <code>[23, 65, 5]</code>.'
-    testString: 'assert(JSON.stringify(new_s) === JSON.stringify([23, 65, 5]), "<code>new_s</code> should equal <code>[23, 65, 5]</code>.");'
+  - text: <code>new_s</code> should equal <code>[23, 65, 5]</code>.
+    testString: assert(JSON.stringify(new_s) === JSON.stringify([23, 65, 5]), '<code>new_s</code> should equal <code>[23, 65, 5]</code>.');
   - text: Your code should not use the <code>filter</code> method.
-    testString: 'assert(!code.match(/\.filter/g), "Your code should not use the <code>filter</code> method.");'
+    testString: assert(!code.match(/\.filter/g), 'Your code should not use the <code>filter</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/introduction-to-currying-and-partial-application.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/introduction-to-currying-and-partial-application.english.md
index 68d679dd7d..4c4a5bb063 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/introduction-to-currying-and-partial-application.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/introduction-to-currying-and-partial-application.english.md
@@ -32,13 +32,13 @@ Fill in the body of the <code>add</code> function so it uses currying to add par
 ```yml
 tests:
   - text: <code>add(10)(20)(30)</code> should return <code>60</code>.
-    testString: 'assert(add(10)(20)(30) === 60, "<code>add(10)(20)(30)</code> should return <code>60</code>.");'
+    testString: assert(add(10)(20)(30) === 60, '<code>add(10)(20)(30)</code> should return <code>60</code>.');
   - text: <code>add(1)(2)(3)</code> should return <code>6</code>.
-    testString: 'assert(add(1)(2)(3) === 6, "<code>add(1)(2)(3)</code> should return <code>6</code>.");'
+    testString: assert(add(1)(2)(3) === 6, '<code>add(1)(2)(3)</code> should return <code>6</code>.');
   - text: <code>add(11)(22)(33)</code> should return <code>66</code>.
-    testString: 'assert(add(11)(22)(33) === 66, "<code>add(11)(22)(33)</code> should return <code>66</code>.");'
+    testString: assert(add(11)(22)(33) === 66, '<code>add(11)(22)(33)</code> should return <code>66</code>.');
   - text: Your code should include a final statement that returns <code>x + y + z</code>.
-    testString: 'assert(code.match(/[xyz]\s*?\+\s*?[xyz]\s*?\+\s*?[xyz]/g), "Your code should include a final statement that returns <code>x + y + z</code>.");'
+    testString: assert(code.match(/[xyz]\s*?\+\s*?[xyz]\s*?\+\s*?[xyz]/g), 'Your code should include a final statement that returns <code>x + y + z</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/learn-about-functional-programming.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/learn-about-functional-programming.english.md
index 72f7f4568c..b93f2366a4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/learn-about-functional-programming.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/learn-about-functional-programming.english.md
@@ -26,9 +26,9 @@ In the code editor, the <code>prepareTea</code> and <code>getTea</code> function
 ```yml
 tests:
   - text: The <code>tea4TeamFCC</code> variable should hold 40 cups of tea for the team.
-    testString: 'assert(tea4TeamFCC.length === 40, "The <code>tea4TeamFCC</code> variable should hold 40 cups of tea for the team.");'
+    testString: assert(tea4TeamFCC.length === 40, 'The <code>tea4TeamFCC</code> variable should hold 40 cups of tea for the team.');
   - text: The <code>tea4TeamFCC</code> variable should hold cups of green tea.
-    testString: 'assert(tea4TeamFCC[0] === "greenTea", "The <code>tea4TeamFCC</code> variable should hold cups of green tea.");'
+    testString: assert(tea4TeamFCC[0] === 'greenTea', 'The <code>tea4TeamFCC</code> variable should hold cups of green tea.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/pass-arguments-to-avoid-external-dependence-in-a-function.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/pass-arguments-to-avoid-external-dependence-in-a-function.english.md
index 456c202094..f2fa09ce03 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/pass-arguments-to-avoid-external-dependence-in-a-function.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/pass-arguments-to-avoid-external-dependence-in-a-function.english.md
@@ -26,11 +26,11 @@ Write the <code>incrementer</code> function so it takes an argument, and then in
 ```yml
 tests:
   - text: Your function <code>incrementer</code> should not change the value of <code>fixedValue</code>.
-    testString: 'assert(fixedValue === 4, "Your function <code>incrementer</code> should not change the value of <code>fixedValue</code>.");'
+    testString: assert(fixedValue === 4, 'Your function <code>incrementer</code> should not change the value of <code>fixedValue</code>.');
   - text: Your <code>incrementer</code> function should take a parameter.
-    testString: 'assert(code.match(/function\s+?incrementer\s*?\(.+?\)/g), "Your <code>incrementer</code> function should take a parameter.");'
+    testString: assert(code.match(/function\s+?incrementer\s*?\(.+?\)/g), 'Your <code>incrementer</code> function should take a parameter.');
   - text: Your <code>incrementer</code> function should return a value that is one larger than the <code>fixedValue</code> value.
-    testString: 'assert(newValue === 5, "Your <code>incrementer</code> function should return a value that is one larger than the <code>fixedValue</code> value.");'
+    testString: assert(newValue === 5, 'Your <code>incrementer</code> function should return a value that is one larger than the <code>fixedValue</code> value.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/refactor-global-variables-out-of-functions.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/refactor-global-variables-out-of-functions.english.md
index cc4950c479..036ca4c662 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/refactor-global-variables-out-of-functions.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/refactor-global-variables-out-of-functions.english.md
@@ -22,14 +22,14 @@ Refactor (rewrite) the code so the global array <code>bookList</code> is not cha
 
 ```yml
 tests:
-  - text: '<code>bookList</code> should not change and still equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.'
-    testString: 'assert(JSON.stringify(bookList) === JSON.stringify(["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]), "<code>bookList</code> should not change and still equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.");'
-  - text: '<code>newBookList</code> should equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.'
-    testString: 'assert(JSON.stringify(newBookList) === JSON.stringify(["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]), "<code>newBookList</code> should equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.");'
-  - text: '<code>newerBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.'
-    testString: 'assert(JSON.stringify(newerBookList) === JSON.stringify(["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]), "<code>newerBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.");'
-  - text: '<code>newestBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.'
-    testString: 'assert(JSON.stringify(newestBookList) === JSON.stringify(["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]), "<code>newestBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.");'
+  - text: <code>bookList</code> should not change and still equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.
+    testString: assert(JSON.stringify(bookList) === JSON.stringify(["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]), '<code>bookList</code> should not change and still equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.');
+  - text: <code>newBookList</code> should equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.
+    testString: assert(JSON.stringify(newBookList) === JSON.stringify(['The Hound of the Baskervilles', 'On The Electrodynamics of Moving Bodies', 'Philosophiæ Naturalis Principia Mathematica', 'Disquisitiones Arithmeticae', 'A Brief History of Time']), '<code>newBookList</code> should equal <code>["The Hound of the Baskervilles", "On The Electrodynamics of Moving Bodies", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.');
+  - text: <code>newerBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.
+    testString: assert(JSON.stringify(newerBookList) === JSON.stringify(['The Hound of the Baskervilles', 'Philosophiæ Naturalis Principia Mathematica', 'Disquisitiones Arithmeticae']), '<code>newerBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae"]</code>.');
+  - text: <code>newestBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.
+    testString: assert(JSON.stringify(newestBookList) === JSON.stringify(['The Hound of the Baskervilles', 'Philosophiæ Naturalis Principia Mathematica', 'Disquisitiones Arithmeticae', 'A Brief History of Time']), '<code>newestBookList</code> should equal <code>["The Hound of the Baskervilles", "Philosophiæ Naturalis Principia Mathematica", "Disquisitiones Arithmeticae", "A Brief History of Time"]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/remove-elements-from-an-array-using-slice-instead-of-splice.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/remove-elements-from-an-array-using-slice-instead-of-splice.english.md
index e320434f87..ea8e778bbe 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/remove-elements-from-an-array-using-slice-instead-of-splice.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/remove-elements-from-an-array-using-slice-instead-of-splice.english.md
@@ -23,13 +23,13 @@ Do not mutate the original array provided to the function.
 ```yml
 tests:
   - text: Your code should use the <code>slice</code> method.
-    testString: 'assert(code.match(/\.slice/g), "Your code should use the <code>slice</code> method.");'
+    testString: assert(code.match(/\.slice/g), 'Your code should use the <code>slice</code> method.');
   - text: Your code should not use the <code>splice</code> method.
-    testString: 'assert(!code.match(/\.splice/g), "Your code should not use the <code>splice</code> method.");'
+    testString: assert(!code.match(/\.splice/g), 'Your code should not use the <code>splice</code> method.');
   - text: The <code>inputCities</code> array should not change.
-    testString: 'assert(JSON.stringify(inputCities) === JSON.stringify(["Chicago", "Delhi", "Islamabad", "London", "Berlin"]), "The <code>inputCities</code> array should not change.");'
-  - text: '<code>nonMutatingSplice(["Chicago", "Delhi", "Islamabad", "London", "Berlin"])</code> should return <code>["Chicago", "Delhi", "Islamabad"]</code>.'
-    testString: 'assert(JSON.stringify(nonMutatingSplice(["Chicago", "Delhi", "Islamabad", "London", "Berlin"])) === JSON.stringify(["Chicago", "Delhi", "Islamabad"]), "<code>nonMutatingSplice(["Chicago", "Delhi", "Islamabad", "London", "Berlin"])</code> should return <code>["Chicago", "Delhi", "Islamabad"]</code>.");'
+    testString: assert(JSON.stringify(inputCities) === JSON.stringify(["Chicago", "Delhi", "Islamabad", "London", "Berlin"]), 'The <code>inputCities</code> array should not change.');
+  - text: <code>nonMutatingSplice(["Chicago", "Delhi", "Islamabad", "London", "Berlin"])</code> should return <code>["Chicago", "Delhi", "Islamabad"]</code>.
+    testString: assert(JSON.stringify(nonMutatingSplice(["Chicago", "Delhi", "Islamabad", "London", "Berlin"])) === JSON.stringify(["Chicago", "Delhi", "Islamabad"]), '<code>nonMutatingSplice(["Chicago", "Delhi", "Islamabad", "London", "Berlin"])</code> should return <code>["Chicago", "Delhi", "Islamabad"]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-a-sorted-array-without-changing-the-original-array.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-a-sorted-array-without-changing-the-original-array.english.md
index 89e5f861db..5a41f44f79 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-a-sorted-array-without-changing-the-original-array.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-a-sorted-array-without-changing-the-original-array.english.md
@@ -20,13 +20,13 @@ Use the <code>sort</code> method in the <code>nonMutatingSort</code> function to
 ```yml
 tests:
   - text: Your code should use the <code>sort</code> method.
-    testString: 'assert(code.match(/\.sort/g), "Your code should use the <code>sort</code> method.");'
+    testString: assert(code.match(/\.sort/g), 'Your code should use the <code>sort</code> method.');
   - text: Your code should use the <code>concat</code> method.
-    testString: 'assert(code.match(/\.concat/g), "Your code should use the <code>concat</code> method.");'
+    testString: assert(code.match(/\.concat/g), 'Your code should use the <code>concat</code> method.');
   - text: The <code>globalArray</code> variable should not change.
-    testString: 'assert(JSON.stringify(globalArray) === JSON.stringify([5, 6, 3, 2, 9]), "The <code>globalArray</code> variable should not change.");'
-  - text: '<code>nonMutatingSort(globalArray)</code> should return <code>[2, 3, 5, 6, 9]</code>.'
-    testString: 'assert(JSON.stringify(nonMutatingSort(globalArray)) === JSON.stringify([2, 3, 5, 6, 9]), "<code>nonMutatingSort(globalArray)</code> should return <code>[2, 3, 5, 6, 9]</code>.");'
+    testString: assert(JSON.stringify(globalArray) === JSON.stringify([5, 6, 3, 2, 9]), 'The <code>globalArray</code> variable should not change.');
+  - text: <code>nonMutatingSort(globalArray)</code> should return <code>[2, 3, 5, 6, 9]</code>.
+    testString: assert(JSON.stringify(nonMutatingSort(globalArray)) === JSON.stringify([2, 3, 5, 6, 9]), '<code>nonMutatingSort(globalArray)</code> should return <code>[2, 3, 5, 6, 9]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-part-of-an-array-using-the-slice-method.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-part-of-an-array-using-the-slice-method.english.md
index a811e8ad8c..d41e96cbd5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-part-of-an-array-using-the-slice-method.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/return-part-of-an-array-using-the-slice-method.english.md
@@ -22,15 +22,15 @@ Use the <code>slice</code> method in the <code>sliceArray</code> function to ret
 ```yml
 tests:
   - text: Your code should use the <code>slice</code> method.
-    testString: 'assert(code.match(/\.slice/g), "Your code should use the <code>slice</code> method.");'
+    testString: assert(code.match(/\.slice/g), 'Your code should use the <code>slice</code> method.');
   - text: The <code>inputAnim</code> variable should not change.
-    testString: 'assert(JSON.stringify(inputAnim) === JSON.stringify(["Cat", "Dog", "Tiger", "Zebra", "Ant"]), "The <code>inputAnim</code> variable should not change.");'
-  - text: '<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 3)</code> should return <code>["Dog", "Tiger"]</code>.'
-    testString: 'assert(JSON.stringify(sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 3)) === JSON.stringify(["Dog", "Tiger"]), "<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 3)</code> should return <code>["Dog", "Tiger"]</code>.");'
-  - text: '<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 0, 1)</code> should return <code>["Cat"]</code>.'
-    testString: 'assert(JSON.stringify(sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 0, 1)) === JSON.stringify(["Cat"]), "<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 0, 1)</code> should return <code>["Cat"]</code>.");'
-  - text: '<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 4)</code> should return <code>["Dog", "Tiger", "Zebra"]</code>.'
-    testString: 'assert(JSON.stringify(sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 4)) === JSON.stringify(["Dog", "Tiger", "Zebra"]), "<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 4)</code> should return <code>["Dog", "Tiger", "Zebra"]</code>.");'
+    testString: assert(JSON.stringify(inputAnim) === JSON.stringify(["Cat", "Dog", "Tiger", "Zebra", "Ant"]), 'The <code>inputAnim</code> variable should not change.');
+  - text: <code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 3)</code> should return <code>["Dog", "Tiger"]</code>.
+    testString: assert(JSON.stringify(sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 3)) === JSON.stringify(["Dog", "Tiger"]), '<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 3)</code> should return <code>["Dog", "Tiger"]</code>.');
+  - text: <code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 0, 1)</code> should return <code>["Cat"]</code>.
+    testString: assert(JSON.stringify(sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 0, 1)) === JSON.stringify(["Cat"]), '<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 0, 1)</code> should return <code>["Cat"]</code>.');
+  - text: <code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 4)</code> should return <code>["Dog", "Tiger", "Zebra"]</code>.
+    testString: assert(JSON.stringify(sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 4)) === JSON.stringify(["Dog", "Tiger", "Zebra"]), '<code>sliceArray(["Cat", "Dog", "Tiger", "Zebra", "Ant"], 1, 4)</code> should return <code>["Dog", "Tiger", "Zebra"]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/sort-an-array-alphabetically-using-the-sort-method.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/sort-an-array-alphabetically-using-the-sort-method.english.md
index b2f93c7d26..d410660171 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/sort-an-array-alphabetically-using-the-sort-method.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/sort-an-array-alphabetically-using-the-sort-method.english.md
@@ -23,13 +23,13 @@ Use the <code>sort</code> method in the <code>alphabeticalOrder</code> function
 ```yml
 tests:
   - text: Your code should use the <code>sort</code> method.
-    testString: 'assert(code.match(/\.sort/g), "Your code should use the <code>sort</code> method.");'
-  - text: '<code>alphabeticalOrder(["a", "d", "c", "a", "z", "g"])</code> should return <code>["a", "a", "c", "d", "g", "z"]</code>.'
-    testString: 'assert(JSON.stringify(alphabeticalOrder(["a", "d", "c", "a", "z", "g"])) === JSON.stringify(["a", "a", "c", "d", "g", "z"]), "<code>alphabeticalOrder(["a", "d", "c", "a", "z", "g"])</code> should return <code>["a", "a", "c", "d", "g", "z"]</code>.");'
-  - text: '<code>alphabeticalOrder(["x", "h", "a", "m", "n", "m"])</code> should return <code>["a", "h", "m", "m", "n", "x"]</code>.'
-    testString: 'assert(JSON.stringify(alphabeticalOrder(["x", "h", "a", "m", "n", "m"])) === JSON.stringify(["a", "h", "m", "m", "n", "x"]), "<code>alphabeticalOrder(["x", "h", "a", "m", "n", "m"])</code> should return <code>["a", "h", "m", "m", "n", "x"]</code>.");'
-  - text: '<code>alphabeticalOrder(["a", "a", "a", "a", "x", "t"])</code> should return <code>["a", "a", "a", "a", "t", "x"]</code>.'
-    testString: 'assert(JSON.stringify(alphabeticalOrder(["a", "a", "a", "a", "x", "t"])) === JSON.stringify(["a", "a", "a", "a", "t", "x"]), "<code>alphabeticalOrder(["a", "a", "a", "a", "x", "t"])</code> should return <code>["a", "a", "a", "a", "t", "x"]</code>.");'
+    testString: assert(code.match(/\.sort/g), 'Your code should use the <code>sort</code> method.');
+  - text: <code>alphabeticalOrder(["a", "d", "c", "a", "z", "g"])</code> should return <code>["a", "a", "c", "d", "g", "z"]</code>.
+    testString: assert(JSON.stringify(alphabeticalOrder(["a", "d", "c", "a", "z", "g"])) === JSON.stringify(["a", "a", "c", "d", "g", "z"]), '<code>alphabeticalOrder(["a", "d", "c", "a", "z", "g"])</code> should return <code>["a", "a", "c", "d", "g", "z"]</code>.');
+  - text: <code>alphabeticalOrder(["x", "h", "a", "m", "n", "m"])</code> should return <code>["a", "h", "m", "m", "n", "x"]</code>.
+    testString: assert(JSON.stringify(alphabeticalOrder(["x", "h", "a", "m", "n", "m"])) === JSON.stringify(["a", "h", "m", "m", "n", "x"]), '<code>alphabeticalOrder(["x", "h", "a", "m", "n", "m"])</code> should return <code>["a", "h", "m", "m", "n", "x"]</code>.');
+  - text: <code>alphabeticalOrder(["a", "a", "a", "a", "x", "t"])</code> should return <code>["a", "a", "a", "a", "t", "x"]</code>.
+    testString: assert(JSON.stringify(alphabeticalOrder(["a", "a", "a", "a", "x", "t"])) === JSON.stringify(["a", "a", "a", "a", "t", "x"]), '<code>alphabeticalOrder(["a", "a", "a", "a", "x", "t"])</code> should return <code>["a", "a", "a", "a", "t", "x"]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/split-a-string-into-an-array-using-the-split-method.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/split-a-string-into-an-array-using-the-split-method.english.md
index da863adb3a..422abbebdc 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/split-a-string-into-an-array-using-the-split-method.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/split-a-string-into-an-array-using-the-split-method.english.md
@@ -23,13 +23,13 @@ Use the <code>split</code> method inside the <code>splitify</code> function to s
 ```yml
 tests:
   - text: Your code should use the <code>split</code> method.
-    testString: 'assert(code.match(/\.split/g), "Your code should use the <code>split</code> method.");'
-  - text: '<code>splitify("Hello World,I-am code")</code> should return <code>["Hello", "World", "I", "am", "code"]</code>.'
-    testString: 'assert(JSON.stringify(splitify("Hello World,I-am code")) === JSON.stringify(["Hello", "World", "I", "am", "code"]), "<code>splitify("Hello World,I-am code")</code> should return <code>["Hello", "World", "I", "am", "code"]</code>.");'
-  - text: '<code>splitify("Earth-is-our home")</code> should return <code>["Earth", "is", "our", "home"]</code>.'
-    testString: 'assert(JSON.stringify(splitify("Earth-is-our home")) === JSON.stringify(["Earth", "is", "our", "home"]), "<code>splitify("Earth-is-our home")</code> should return <code>["Earth", "is", "our", "home"]</code>.");'
-  - text: '<code>splitify("This.is.a-sentence")</code> should return <code>["This", "is", "a", "sentence"]</code>.'
-    testString: 'assert(JSON.stringify(splitify("This.is.a-sentence")) === JSON.stringify(["This", "is", "a", "sentence"]), "<code>splitify("This.is.a-sentence")</code> should return <code>["This", "is", "a", "sentence"]</code>.");'
+    testString: assert(code.match(/\.split/g), 'Your code should use the <code>split</code> method.');
+  - text: <code>splitify("Hello World,I-am code")</code> should return <code>["Hello", "World", "I", "am", "code"]</code>.
+    testString: assert(JSON.stringify(splitify("Hello World,I-am code")) === JSON.stringify(["Hello", "World", "I", "am", "code"]), '<code>splitify("Hello World,I-am code")</code> should return <code>["Hello", "World", "I", "am", "code"]</code>.');
+  - text: <code>splitify("Earth-is-our home")</code> should return <code>["Earth", "is", "our", "home"]</code>.
+    testString: assert(JSON.stringify(splitify("Earth-is-our home")) === JSON.stringify(["Earth", "is", "our", "home"]), '<code>splitify("Earth-is-our home")</code> should return <code>["Earth", "is", "our", "home"]</code>.');
+  - text: <code>splitify("This.is.a-sentence")</code> should return <code>["This", "is", "a", "sentence"]</code>.
+    testString: assert(JSON.stringify(splitify("This.is.a-sentence")) === JSON.stringify(["This", "is", "a", "sentence"]), '<code>splitify("This.is.a-sentence")</code> should return <code>["This", "is", "a", "sentence"]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-functional-programming-terminology.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-functional-programming-terminology.english.md
index ca610bae70..e18f498fed 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-functional-programming-terminology.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-functional-programming-terminology.english.md
@@ -27,13 +27,13 @@ Note: The data (the number of cups of tea) is supplied as the last argument. We'
 ```yml
 tests:
   - text: The <code>tea4GreenTeamFCC</code> variable should hold 27 cups of green tea for the team.
-    testString: 'assert(tea4GreenTeamFCC.length === 27, "The <code>tea4GreenTeamFCC</code> variable should hold 27 cups of green tea for the team.");'
+    testString: assert(tea4GreenTeamFCC.length === 27, 'The <code>tea4GreenTeamFCC</code> variable should hold 27 cups of green tea for the team.');
   - text: The <code>tea4GreenTeamFCC</code> variable should hold cups of green tea.
-    testString: 'assert(tea4GreenTeamFCC[0] === "greenTea", "The <code>tea4GreenTeamFCC</code> variable should hold cups of green tea.");'
+    testString: assert(tea4GreenTeamFCC[0] === 'greenTea', 'The <code>tea4GreenTeamFCC</code> variable should hold cups of green tea.');
   - text: The <code>tea4BlackTeamFCC</code> variable should hold 13 cups of black tea.
-    testString: 'assert(tea4BlackTeamFCC.length === 13, "The <code>tea4BlackTeamFCC</code> variable should hold 13 cups of black tea.");'
+    testString: assert(tea4BlackTeamFCC.length === 13, 'The <code>tea4BlackTeamFCC</code> variable should hold 13 cups of black tea.');
   - text: The <code>tea4BlackTeamFCC</code> variable should hold cups of black tea.
-    testString: 'assert(tea4BlackTeamFCC[0] === "blackTea", "The <code>tea4BlackTeamFCC</code> variable should hold cups of black tea.");'
+    testString: assert(tea4BlackTeamFCC[0] === 'blackTea', 'The <code>tea4BlackTeamFCC</code> variable should hold cups of black tea.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-the-hazards-of-using-imperative-code.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-the-hazards-of-using-imperative-code.english.md
index 9fb221c810..9d37021fb6 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-the-hazards-of-using-imperative-code.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/understand-the-hazards-of-using-imperative-code.english.md
@@ -30,7 +30,7 @@ Work through the code and see if you can figure out the problem, then advance to
 ```yml
 tests:
   - text: Move ahead to understand the error.
-    testString: 'assert(true, "Move ahead to understand the error.");'
+    testString: assert(true, 'Move ahead to understand the error.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria.english.md
index 1c2c979f14..7586c63c3c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria.english.md
@@ -22,13 +22,13 @@ Use the <code>every</code> method inside the <code>checkPositive</code> function
 ```yml
 tests:
   - text: Your code should use the <code>every</code> method.
-    testString: 'assert(code.match(/\.every/g), "Your code should use the <code>every</code> method.");'
-  - text: '<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>false</code>.'
-    testString: 'assert(!checkPositive([1, 2, 3, -4, 5]), "<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>false</code>.");'
-  - text: '<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.'
-    testString: 'assert(checkPositive([1, 2, 3, 4, 5]), "<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.");'
-  - text: '<code>checkPositive([1, -2, 3, -4, 5])</code> should return <code>false</code>.'
-    testString: 'assert(!checkPositive([1, -2, 3, -4, 5]), "<code>checkPositive([1, -2, 3, -4, 5])</code> should return <code>false</code>.");'
+    testString: assert(code.match(/\.every/g), 'Your code should use the <code>every</code> method.');
+  - text: <code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>false</code>.
+    testString: assert(!checkPositive([1, 2, 3, -4, 5]), '<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>false</code>.');
+  - text: <code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.
+    testString: assert(checkPositive([1, 2, 3, 4, 5]), '<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.');
+  - text: <code>checkPositive([1, -2, 3, -4, 5])</code> should return <code>false</code>.
+    testString: assert(!checkPositive([1, -2, 3, -4, 5]), '<code>checkPositive([1, -2, 3, -4, 5])</code> should return <code>false</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-filter-method-to-extract-data-from-an-array.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-filter-method-to-extract-data-from-an-array.english.md
index 2753c5c1cc..4c7e6afbad 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-filter-method-to-extract-data-from-an-array.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-filter-method-to-extract-data-from-an-array.english.md
@@ -21,13 +21,13 @@ The variable <code>watchList</code> holds an array of objects with information o
 ```yml
 tests:
   - text: The <code>watchList</code> variable should not change.
-    testString: 'assert(watchList[0].Title === "Inception" && watchList[4].Director == "James Cameron", "The <code>watchList</code> variable should not change.");'
+    testString: assert(watchList[0].Title === "Inception" && watchList[4].Director == "James Cameron", 'The <code>watchList</code> variable should not change.');
   - text: Your code should use the <code>filter</code> method.
-    testString: 'assert(code.match(/\.filter/g), "Your code should use the <code>filter</code> method.");'
+    testString: assert(code.match(/\.filter/g), 'Your code should use the <code>filter</code> method.');
   - text: Your code should not use a <code>for</code> loop.
-    testString: 'assert(!code.match(/for\s*?\(.+?\)/g), "Your code should not use a <code>for</code> loop.");'
+    testString: assert(!code.match(/for\s*?\(.+?\)/g), 'Your code should not use a <code>for</code> loop.');
   - text: '<code>filteredList</code> should equal <code>[{"title": "Inception","rating": "8.8"},{"title": "Interstellar","rating": "8.6"},{"title": "The Dark Knight","rating": "9.0"},{"title": "Batman Begins","rating": "8.3"}]</code>.'
-    testString: 'assert.deepEqual(filteredList, [{"title": "Inception","rating": "8.8"},{"title": "Interstellar","rating": "8.6"},{"title": "The Dark Knight","rating": "9.0"},{"title": "Batman Begins","rating": "8.3"}], "<code>filteredList</code> should equal <code>[{"title": "Inception","rating": "8.8"},{"title": "Interstellar","rating": "8.6"},{"title": "The Dark Knight","rating": "9.0"},{"title": "Batman Begins","rating": "8.3"}]</code>.");'
+    testString: 'assert.deepEqual(filteredList, [{"title": "Inception","rating": "8.8"},{"title": "Interstellar","rating": "8.6"},{"title": "The Dark Knight","rating": "9.0"},{"title": "Batman Begins","rating": "8.3"}], ''<code>filteredList</code> should equal <code>[{"title": "Inception","rating": "8.8"},{"title": "Interstellar","rating": "8.6"},{"title": "The Dark Knight","rating": "9.0"},{"title": "Batman Begins","rating": "8.3"}]</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-map-method-to-extract-data-from-an-array.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-map-method-to-extract-data-from-an-array.english.md
index 6eaa784733..20930f7b4f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-map-method-to-extract-data-from-an-array.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-map-method-to-extract-data-from-an-array.english.md
@@ -24,13 +24,13 @@ The <code>watchList</code> array holds objects with information on several movie
 ```yml
 tests:
   - text: The <code>watchList</code> variable should not change.
-    testString: 'assert(watchList[0].Title === "Inception" && watchList[4].Director == "James Cameron", "The <code>watchList</code> variable should not change.");'
+    testString: assert(watchList[0].Title === "Inception" && watchList[4].Director == "James Cameron", 'The <code>watchList</code> variable should not change.');
   - text: Your code should not use a <code>for</code> loop.
-    testString: 'assert(!code.match(/for\s*?\(.+?\)/g), "Your code should not use a <code>for</code> loop.");'
+    testString: assert(!code.match(/for\s*?\(.+?\)/g), 'Your code should not use a <code>for</code> loop.');
   - text: Your code should use the <code>map</code> method.
-    testString: 'assert(code.match(/\.map/g), "Your code should use the <code>map</code> method.");'
-  - text: '<code>rating</code> should equal <code>[{"title":"Inception","rating":"8.8"},{"title":"Interstellar","rating":"8.6"},{"title":"The Dark Knight","rating":"9.0"},{"title":"Batman Begins","rating":"8.3"},{"title":"Avatar","rating":"7.9"}]</code>.'
-    testString: 'assert(JSON.stringify(rating) === JSON.stringify([{"title":"Inception","rating":"8.8"},{"title":"Interstellar","rating":"8.6"},{"title":"The Dark Knight","rating":"9.0"},{"title":"Batman Begins","rating":"8.3"},{"title":"Avatar","rating":"7.9"}]), "<code>rating</code> should equal <code>[{"title":"Inception","rating":"8.8"},{"title":"Interstellar","rating":"8.6"},{"title":"The Dark Knight","rating":"9.0"},{"title":"Batman Begins","rating":"8.3"},{"title":"Avatar","rating":"7.9"}]</code>.");'
+    testString: assert(code.match(/\.map/g), 'Your code should use the <code>map</code> method.');
+  - text: <code>rating</code> should equal <code>[{"title":"Inception","rating":"8.8"},{"title":"Interstellar","rating":"8.6"},{"title":"The Dark Knight","rating":"9.0"},{"title":"Batman Begins","rating":"8.3"},{"title":"Avatar","rating":"7.9"}]</code>.
+    testString: assert(JSON.stringify(rating) === JSON.stringify([{"title":"Inception","rating":"8.8"},{"title":"Interstellar","rating":"8.6"},{"title":"The Dark Knight","rating":"9.0"},{"title":"Batman Begins","rating":"8.3"},{"title":"Avatar","rating":"7.9"}]), '<code>rating</code> should equal <code>[{"title":"Inception","rating":"8.8"},{"title":"Interstellar","rating":"8.6"},{"title":"The Dark Knight","rating":"9.0"},{"title":"Batman Begins","rating":"8.3"},{"title":"Avatar","rating":"7.9"}]</code>.');
 
 ```
 
@@ -178,11 +178,125 @@ console.log(JSON.stringify(rating));
 <section id='solution'>
 
 ```js
+// the global variable
+var watchList = [
+                 {
+                   "Title": "Inception",
+                   "Year": "2010",
+                   "Rated": "PG-13",
+                   "Released": "16 Jul 2010",
+                   "Runtime": "148 min",
+                   "Genre": "Action, Adventure, Crime",
+                   "Director": "Christopher Nolan",
+                   "Writer": "Christopher Nolan",
+                   "Actors": "Leonardo DiCaprio, Joseph Gordon-Levitt, Ellen Page, Tom Hardy",
+                   "Plot": "A thief, who steals corporate secrets through use of dream-sharing technology, is given the inverse task of planting an idea into the mind of a CEO.",
+                   "Language": "English, Japanese, French",
+                   "Country": "USA, UK",
+                   "Awards": "Won 4 Oscars. Another 143 wins & 198 nominations.",
+                   "Poster": "http://ia.media-imdb.com/images/M/MV5BMjAxMzY3NjcxNF5BMl5BanBnXkFtZTcwNTI5OTM0Mw@@._V1_SX300.jpg",
+                   "Metascore": "74",
+                   "imdbRating": "8.8",
+                   "imdbVotes": "1,446,708",
+                   "imdbID": "tt1375666",
+                   "Type": "movie",
+                   "Response": "True"
+                },
+                {
+                   "Title": "Interstellar",
+                   "Year": "2014",
+                   "Rated": "PG-13",
+                   "Released": "07 Nov 2014",
+                   "Runtime": "169 min",
+                   "Genre": "Adventure, Drama, Sci-Fi",
+                   "Director": "Christopher Nolan",
+                   "Writer": "Jonathan Nolan, Christopher Nolan",
+                   "Actors": "Ellen Burstyn, Matthew McConaughey, Mackenzie Foy, John Lithgow",
+                   "Plot": "A team of explorers travel through a wormhole in space in an attempt to ensure humanity's survival.",
+                   "Language": "English",
+                   "Country": "USA, UK",
+                   "Awards": "Won 1 Oscar. Another 39 wins & 132 nominations.",
+                   "Poster": "http://ia.media-imdb.com/images/M/MV5BMjIxNTU4MzY4MF5BMl5BanBnXkFtZTgwMzM4ODI3MjE@._V1_SX300.jpg",
+                   "Metascore": "74",
+                   "imdbRating": "8.6",
+                   "imdbVotes": "910,366",
+                   "imdbID": "tt0816692",
+                   "Type": "movie",
+                   "Response": "True"
+                },
+                {
+                   "Title": "The Dark Knight",
+                   "Year": "2008",
+                   "Rated": "PG-13",
+                   "Released": "18 Jul 2008",
+                   "Runtime": "152 min",
+                   "Genre": "Action, Adventure, Crime",
+                   "Director": "Christopher Nolan",
+                   "Writer": "Jonathan Nolan (screenplay), Christopher Nolan (screenplay), Christopher Nolan (story), David S. Goyer (story), Bob Kane (characters)",
+                   "Actors": "Christian Bale, Heath Ledger, Aaron Eckhart, Michael Caine",
+                   "Plot": "When the menace known as the Joker wreaks havoc and chaos on the people of Gotham, the caped crusader must come to terms with one of the greatest psychological tests of his ability to fight injustice.",
+                   "Language": "English, Mandarin",
+                   "Country": "USA, UK",
+                   "Awards": "Won 2 Oscars. Another 146 wins & 142 nominations.",
+                   "Poster": "http://ia.media-imdb.com/images/M/MV5BMTMxNTMwODM0NF5BMl5BanBnXkFtZTcwODAyMTk2Mw@@._V1_SX300.jpg",
+                   "Metascore": "82",
+                   "imdbRating": "9.0",
+                   "imdbVotes": "1,652,832",
+                   "imdbID": "tt0468569",
+                   "Type": "movie",
+                   "Response": "True"
+                },
+                {
+                   "Title": "Batman Begins",
+                   "Year": "2005",
+                   "Rated": "PG-13",
+                   "Released": "15 Jun 2005",
+                   "Runtime": "140 min",
+                   "Genre": "Action, Adventure",
+                   "Director": "Christopher Nolan",
+                   "Writer": "Bob Kane (characters), David S. Goyer (story), Christopher Nolan (screenplay), David S. Goyer (screenplay)",
+                   "Actors": "Christian Bale, Michael Caine, Liam Neeson, Katie Holmes",
+                   "Plot": "After training with his mentor, Batman begins his fight to free crime-ridden Gotham City from the corruption that Scarecrow and the League of Shadows have cast upon it.",
+                   "Language": "English, Urdu, Mandarin",
+                   "Country": "USA, UK",
+                   "Awards": "Nominated for 1 Oscar. Another 15 wins & 66 nominations.",
+                   "Poster": "http://ia.media-imdb.com/images/M/MV5BNTM3OTc0MzM2OV5BMl5BanBnXkFtZTYwNzUwMTI3._V1_SX300.jpg",
+                   "Metascore": "70",
+                   "imdbRating": "8.3",
+                   "imdbVotes": "972,584",
+                   "imdbID": "tt0372784",
+                   "Type": "movie",
+                   "Response": "True"
+                },
+                {
+                   "Title": "Avatar",
+                   "Year": "2009",
+                   "Rated": "PG-13",
+                   "Released": "18 Dec 2009",
+                   "Runtime": "162 min",
+                   "Genre": "Action, Adventure, Fantasy",
+                   "Director": "James Cameron",
+                   "Writer": "James Cameron",
+                   "Actors": "Sam Worthington, Zoe Saldana, Sigourney Weaver, Stephen Lang",
+                   "Plot": "A paraplegic marine dispatched to the moon Pandora on a unique mission becomes torn between following his orders and protecting the world he feels is his home.",
+                   "Language": "English, Spanish",
+                   "Country": "USA, UK",
+                   "Awards": "Won 3 Oscars. Another 80 wins & 121 nominations.",
+                   "Poster": "http://ia.media-imdb.com/images/M/MV5BMTYwOTEwNjAzMl5BMl5BanBnXkFtZTcwODc5MTUwMw@@._V1_SX300.jpg",
+                   "Metascore": "83",
+                   "imdbRating": "7.9",
+                   "imdbVotes": "876,575",
+                   "imdbID": "tt0499549",
+                   "Type": "movie",
+                   "Response": "True"
+                }
+];
+
 var rating = watchList.map(function(movie) {
   return {
     title: movie["Title"],
     rating: movie["imdbRating"]
   }
-})
+});
 ```
 </section>
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-reduce-method-to-analyze-data.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-reduce-method-to-analyze-data.english.md
index 199fcae5a3..5b246c8171 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-reduce-method-to-analyze-data.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-reduce-method-to-analyze-data.english.md
@@ -23,13 +23,13 @@ The variable <code>watchList</code> holds an array of objects with information o
 ```yml
 tests:
   - text: The <code>watchList</code> variable should not change.
-    testString: 'assert(watchList[0].Title === "Inception" && watchList[4].Director == "James Cameron", "The <code>watchList</code> variable should not change.");'
+    testString: assert(watchList[0].Title === "Inception" && watchList[4].Director == "James Cameron", 'The <code>watchList</code> variable should not change.');
   - text: Your code should use the <code>reduce</code> method.
-    testString: 'assert(code.match(/\.reduce/g), "Your code should use the <code>reduce</code> method.");'
+    testString: assert(code.match(/\.reduce/g), 'Your code should use the <code>reduce</code> method.');
   - text: The <code>averageRating</code> should equal 8.675.
-    testString: 'assert(averageRating == 8.675, "The <code>averageRating</code> should equal 8.675.");'
+    testString: assert(averageRating == 8.675, 'The <code>averageRating</code> should equal 8.675.');
   - text: Your code should not use a <code>for</code> loop.
-    testString: 'assert(!code.match(/for\s*?\(.*\)/g), "Your code should not use a <code>for</code> loop.");'
+    testString: assert(!code.match(/for\s*?\(.*\)/g), 'Your code should not use a <code>for</code> loop.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.english.md
index 6c5c7c3ae7..04c8b8fdfa 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming/use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.english.md
@@ -22,13 +22,13 @@ Use the <code>some</code> method inside the <code>checkPositive</code> function
 ```yml
 tests:
   - text: Your code should use the <code>some</code> method.
-    testString: 'assert(code.match(/\.some/g), "Your code should use the <code>some</code> method.");'
-  - text: '<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>true</code>.'
-    testString: 'assert(checkPositive([1, 2, 3, -4, 5]), "<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>true</code>.");'
-  - text: '<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.'
-    testString: 'assert(checkPositive([1, 2, 3, 4, 5]), "<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.");'
-  - text: '<code>checkPositive([-1, -2, -3, -4, -5])</code> should return <code>false</code>.'
-    testString: 'assert(!checkPositive([-1, -2, -3, -4, -5]), "<code>checkPositive([-1, -2, -3, -4, -5])</code> should return <code>false</code>.");'
+    testString: assert(code.match(/\.some/g), 'Your code should use the <code>some</code> method.');
+  - text: <code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>true</code>.
+    testString: assert(checkPositive([1, 2, 3, -4, 5]), '<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>true</code>.');
+  - text: <code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.
+    testString: assert(checkPositive([1, 2, 3, 4, 5]), '<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.');
+  - text: <code>checkPositive([-1, -2, -3, -4, -5])</code> should return <code>false</code>.
+    testString: assert(!checkPositive([-1, -2, -3, -4, -5]), '<code>checkPositive([-1, -2, -3, -4, -5])</code> should return <code>false</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.english.md
index 21eb1e5fea..f9597a328e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.english.md
@@ -27,16 +27,16 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>addTogether(2, 3)</code> should return 5.'
-    testString: 'assert.deepEqual(addTogether(2, 3), 5, "<code>addTogether(2, 3)</code> should return 5.");'
+  - text: <code>addTogether(2, 3)</code> should return 5.
+    testString: assert.deepEqual(addTogether(2, 3), 5, '<code>addTogether(2, 3)</code> should return 5.');
   - text: <code>addTogether(2)(3)</code> should return 5.
-    testString: 'assert.deepEqual(addTogether(2)(3), 5, "<code>addTogether(2)(3)</code> should return 5.");'
-  - text: '<code>addTogether("http://bit.ly/IqT6zt")</code> should return undefined.'
-    testString: 'assert.isUndefined(addTogether("http://bit.ly/IqT6zt"), "<code>addTogether("http://bit.ly/IqT6zt")</code> should return undefined.");'
-  - text: '<code>addTogether(2, "3")</code> should return undefined.'
-    testString: 'assert.isUndefined(addTogether(2, "3"), "<code>addTogether(2, "3")</code> should return undefined.");'
-  - text: '<code>addTogether(2)([3])</code> should return undefined.'
-    testString: 'assert.isUndefined(addTogether(2)([3]), "<code>addTogether(2)([3])</code> should return undefined.");'
+    testString: assert.deepEqual(addTogether(2)(3), 5, '<code>addTogether(2)(3)</code> should return 5.');
+  - text: <code>addTogether("http://bit.ly/IqT6zt")</code> should return undefined.
+    testString: assert.isUndefined(addTogether("http://bit.ly/IqT6zt"), '<code>addTogether("http://bit.ly/IqT6zt")</code> should return undefined.');
+  - text: <code>addTogether(2, "3")</code> should return undefined.
+    testString: assert.isUndefined(addTogether(2, "3"), '<code>addTogether(2, "3")</code> should return undefined.');
+  - text: <code>addTogether(2)([3])</code> should return undefined.
+    testString: assert.isUndefined(addTogether(2)([3]), '<code>addTogether(2)([3])</code> should return undefined.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.english.md
index 0aaf516b8c..bd343ba7ad 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.english.md
@@ -22,10 +22,10 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111")</code> should return "Aren&#39;t bonfires fun!?"'
-    testString: 'assert.deepEqual(binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111"), "Aren"t bonfires fun!?", "<code>binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111")</code> should return "Aren&#39;t bonfires fun!?"");'
+  - text: <code>binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111")</code> should return "Aren&#39;t bonfires fun!?"
+    testString: assert.deepEqual(binaryAgent('01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111'), "Aren't bonfires fun!?", '<code>binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111")</code> should return "Aren&#39;t bonfires fun!?"');
   - text: <code>binaryAgent("01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001")</code> should return "I love FreeCodeCamp!"
-    testString: 'assert.deepEqual(binaryAgent("01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001"), "I love FreeCodeCamp!", "<code>binaryAgent("01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001")</code> should return "I love FreeCodeCamp!"");'
+    testString: assert.deepEqual(binaryAgent('01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001'), "I love FreeCodeCamp!", '<code>binaryAgent("01001001 00100000 01101100 01101111 01110110 01100101 00100000 01000110 01110010 01100101 01100101 01000011 01101111 01100100 01100101 01000011 01100001 01101101 01110000 00100001")</code> should return "I love FreeCodeCamp!"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.english.md
index 55e5c530cb..f2b6c3869b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.english.md
@@ -21,20 +21,20 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>convertHTML("Dolce & Gabbana")</code> should return <code>Dolce &amp; Gabbana</code>.'
-    testString: 'assert.match(convertHTML("Dolce & Gabbana"), /Dolce &amp; Gabbana/, "<code>convertHTML("Dolce & Gabbana")</code> should return <code>Dolce &amp; Gabbana</code>.");'
-  - text: '<code>convertHTML("Hamburgers < Pizza < Tacos")</code> should return <code>Hamburgers &lt; Pizza &lt; Tacos</code>.'
-    testString: 'assert.match(convertHTML("Hamburgers < Pizza < Tacos"), /Hamburgers &lt; Pizza &lt; Tacos/, "<code>convertHTML("Hamburgers < Pizza < Tacos")</code> should return <code>Hamburgers &lt; Pizza &lt; Tacos</code>.");'
-  - text: '<code>convertHTML("Sixty > twelve")</code> should return <code>Sixty &gt; twelve</code>.'
-    testString: 'assert.match(convertHTML("Sixty > twelve"), /Sixty &gt; twelve/, "<code>convertHTML("Sixty > twelve")</code> should return <code>Sixty &gt; twelve</code>.");'
-  - text: '<code>convertHTML(&apos;Stuff in "quotation marks"&apos;)</code> should return <code>Stuff in &quot;quotation marks&quot;</code>.'
-    testString: 'assert.match(convertHTML("Stuff in "quotation marks""), /Stuff in &quot;quotation marks&quot;/, "<code>convertHTML(&apos;Stuff in "quotation marks"&apos;)</code> should return <code>Stuff in &quot;quotation marks&quot;</code>.");'
-  - text: '<code>convertHTML("Schindler&apos;s List")</code> should return <code>Schindler&apos;s List</code>.'
-    testString: 'assert.match(convertHTML("Schindler"s List"), /Schindler&apos;s List/, "<code>convertHTML("Schindler&apos;s List")</code> should return <code>Schindler&apos;s List</code>.");'
-  - text: '<code>convertHTML("<>")</code> should return <code>&lt;&gt;</code>.'
-    testString: 'assert.match(convertHTML("<>"), /&lt;&gt;/, "<code>convertHTML("<>")</code> should return <code>&lt;&gt;</code>.");'
+  - text: <code>convertHTML("Dolce & Gabbana")</code> should return <code>Dolce &amp; Gabbana</code>.
+    testString: assert.match(convertHTML("Dolce & Gabbana"), /Dolce &amp; Gabbana/, '<code>convertHTML("Dolce & Gabbana")</code> should return <code>Dolce &amp; Gabbana</code>.');
+  - text: <code>convertHTML("Hamburgers < Pizza < Tacos")</code> should return <code>Hamburgers &lt; Pizza &lt; Tacos</code>.
+    testString: assert.match(convertHTML("Hamburgers < Pizza < Tacos"), /Hamburgers &lt; Pizza &lt; Tacos/, '<code>convertHTML("Hamburgers < Pizza < Tacos")</code> should return <code>Hamburgers &lt; Pizza &lt; Tacos</code>.');
+  - text: <code>convertHTML("Sixty > twelve")</code> should return <code>Sixty &gt; twelve</code>.
+    testString: assert.match(convertHTML("Sixty > twelve"), /Sixty &gt; twelve/, '<code>convertHTML("Sixty > twelve")</code> should return <code>Sixty &gt; twelve</code>.');
+  - text: <code>convertHTML(&apos;Stuff in "quotation marks"&apos;)</code> should return <code>Stuff in &quot;quotation marks&quot;</code>.
+    testString: assert.match(convertHTML('Stuff in "quotation marks"'), /Stuff in &quot;quotation marks&quot;/, '<code>convertHTML(&apos;Stuff in "quotation marks"&apos;)</code> should return <code>Stuff in &quot;quotation marks&quot;</code>.');
+  - text: <code>convertHTML("Schindler&apos;s List")</code> should return <code>Schindler&apos;s List</code>.
+    testString: assert.match(convertHTML("Schindler's List"), /Schindler&apos;s List/, '<code>convertHTML("Schindler&apos;s List")</code> should return <code>Schindler&apos;s List</code>.');
+  - text: <code>convertHTML("<>")</code> should return <code>&lt;&gt;</code>.
+    testString: assert.match(convertHTML('<>'), /&lt;&gt;/, '<code>convertHTML("<>")</code> should return <code>&lt;&gt;</code>.');
   - text: <code>convertHTML("abc")</code> should return <code>abc</code>.
-    testString: 'assert.strictEqual(convertHTML("abc"), "abc", "<code>convertHTML("abc")</code> should return <code>abc</code>.");'
+    testString: assert.strictEqual(convertHTML('abc'), 'abc', '<code>convertHTML("abc")</code> should return <code>abc</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.english.md
index cd7befc348..efa66e4b90 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.english.md
@@ -22,36 +22,36 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5])</code> should return an array.'
-    testString: 'assert(typeof diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]) === "object", "<code>diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5])</code> should return an array.");'
-  - text: '<code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["pink wool"]</code>.'
-    testString: 'assert.sameMembers(diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]), ["pink wool"], "<code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["pink wool"]</code>.");'
-  - text: '<code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with one item.'
-    testString: 'assert(diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]).length === 1, "<code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with one item.");'
-  - text: '<code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["diorite", "pink wool"]</code>.'
-    testString: 'assert.sameMembers(diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]), ["diorite", "pink wool"], "<code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["diorite", "pink wool"]</code>.");'
-  - text: '<code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with two items.'
-    testString: 'assert(diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]).length === 2, "<code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with two items.");'
-  - text: '<code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return <code>[]</code>.'
-    testString: 'assert.sameMembers(diffArray(["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]), [], "<code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return <code>[]</code>.");'
-  - text: '<code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return an empty array.'
-    testString: 'assert(diffArray(["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]).length === 0, "<code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return an empty array.");'
-  - text: '<code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return <code>[4]</code>.'
-    testString: 'assert.sameMembers(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]), [4], "<code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return <code>[4]</code>.");'
-  - text: '<code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return an array with one item.'
-    testString: 'assert(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]).length  === 1, "<code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return an array with one item.");'
-  - text: '<code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return <code>["piglet", 4]</code>.'
-    testString: 'assert.sameMembers(diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]), ["piglet", 4], "<code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return <code>["piglet", 4]</code>.");'
-  - text: '<code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return an array with two items.'
-    testString: 'assert(diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]).length === 2, "<code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return an array with two items.");'
-  - text: '<code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return <code>["snuffleupagus", "cookie monster", "elmo"]</code>.'
-    testString: 'assert.sameMembers(diffArray([], ["snuffleupagus", "cookie monster", "elmo"]), ["snuffleupagus", "cookie monster", "elmo"], "<code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return <code>["snuffleupagus", "cookie monster", "elmo"]</code>.");'
-  - text: '<code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return an array with three items.'
-    testString: 'assert(diffArray([], ["snuffleupagus", "cookie monster", "elmo"]).length === 3, "<code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return an array with three items.");'
-  - text: '<code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return <code>[1, "calf", 3, "piglet", 7, "filly"]</code>.'
-    testString: 'assert.sameMembers(diffArray([1, "calf", 3, "piglet"], [7, "filly"]), [1, "calf", 3, "piglet", 7, "filly"], "<code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return <code>[1, "calf", 3, "piglet", 7, "filly"]</code>.");'
-  - text: '<code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return an array with six items.'
-    testString: 'assert(diffArray([1, "calf", 3, "piglet"], [7, "filly"]).length === 6, "<code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return an array with six items.");'
+  - text: <code>diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5])</code> should return an array.
+    testString: assert(typeof diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]) === "object", '<code>diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5])</code> should return an array.');
+  - text: <code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["pink wool"]</code>.
+    testString: assert.sameMembers(diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]), ["pink wool"], '<code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["pink wool"]</code>.');
+  - text: <code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with one item.
+    testString: assert(diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]).length === 1, '<code>["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with one item.');
+  - text: <code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["diorite", "pink wool"]</code>.
+    testString: assert.sameMembers(diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]), ["diorite", "pink wool"], '<code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return <code>["diorite", "pink wool"]</code>.');
+  - text: <code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with two items.
+    testString: assert(diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]).length === 2, '<code>["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]</code> should return an array with two items.');
+  - text: <code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return <code>[]</code>.
+    testString: assert.sameMembers(diffArray(["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]), [], '<code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return <code>[]</code>.');
+  - text: <code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return an empty array.
+    testString: assert(diffArray(["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]).length === 0, '<code>["andesite", "grass", "dirt", "dead shrub"], ["andesite", "grass", "dirt", "dead shrub"]</code> should return an empty array.');
+  - text: <code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return <code>[4]</code>.
+    testString: assert.sameMembers(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]), [4], '<code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return <code>[4]</code>.');
+  - text: <code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return an array with one item.
+    testString: assert(diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]).length  === 1, '<code>[1, 2, 3, 5], [1, 2, 3, 4, 5]</code> should return an array with one item.');
+  - text: <code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return <code>["piglet", 4]</code>.
+    testString: assert.sameMembers(diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]), ["piglet", 4], '<code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return <code>["piglet", 4]</code>.');
+  - text: <code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return an array with two items.
+    testString: assert(diffArray([1, "calf", 3, "piglet"], [1, "calf", 3, 4]).length === 2, '<code>[1, "calf", 3, "piglet"], [1, "calf", 3, 4]</code> should return an array with two items.');
+  - text: <code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return <code>["snuffleupagus", "cookie monster", "elmo"]</code>.
+    testString: assert.sameMembers(diffArray([], ["snuffleupagus", "cookie monster", "elmo"]), ["snuffleupagus", "cookie monster", "elmo"], '<code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return <code>["snuffleupagus", "cookie monster", "elmo"]</code>.');
+  - text: <code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return an array with three items.
+    testString: assert(diffArray([], ["snuffleupagus", "cookie monster", "elmo"]).length === 3, '<code>[], ["snuffleupagus", "cookie monster", "elmo"]</code> should return an array with three items.');
+  - text: <code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return <code>[1, "calf", 3, "piglet", 7, "filly"]</code>.
+    testString: assert.sameMembers(diffArray([1, "calf", 3, "piglet"], [7, "filly"]), [1, "calf", 3, "piglet", 7, "filly"], '<code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return <code>[1, "calf", 3, "piglet", 7, "filly"]</code>.');
+  - text: <code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return an array with six items.
+    testString: assert(diffArray([1, "calf", 3, "piglet"], [7, "filly"]).length === 6, '<code>[1, "calf", 3, "piglet"], [7, "filly"]</code> should return an array with six items.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.english.md
index 17db173d89..79eeca07a1 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.english.md
@@ -25,12 +25,12 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>pairElement("ATCGA")</code> should return <code>[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]</code>.'
-    testString: 'assert.deepEqual(pairElement("ATCGA"),[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]], "<code>pairElement("ATCGA")</code> should return <code>[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]</code>.");'
-  - text: '<code>pairElement("TTGAG")</code> should return <code>[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]</code>.'
-    testString: 'assert.deepEqual(pairElement("TTGAG"),[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]], "<code>pairElement("TTGAG")</code> should return <code>[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]</code>.");'
-  - text: '<code>pairElement("CTCTA")</code> should return <code>[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]</code>.'
-    testString: 'assert.deepEqual(pairElement("CTCTA"),[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]], "<code>pairElement("CTCTA")</code> should return <code>[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]</code>.");'
+  - text: <code>pairElement("ATCGA")</code> should return <code>[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]</code>.
+    testString: assert.deepEqual(pairElement("ATCGA"),[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]], '<code>pairElement("ATCGA")</code> should return <code>[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]</code>.');
+  - text: <code>pairElement("TTGAG")</code> should return <code>[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]</code>.
+    testString: assert.deepEqual(pairElement("TTGAG"),[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]], '<code>pairElement("TTGAG")</code> should return <code>[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]</code>.');
+  - text: <code>pairElement("CTCTA")</code> should return <code>[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]</code>.
+    testString: assert.deepEqual(pairElement("CTCTA"),[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]], '<code>pairElement("CTCTA")</code> should return <code>[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.english.md
index ca6e20e1e1..17f525256b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.english.md
@@ -22,18 +22,18 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>dropElements([1, 2, 3, 4], function(n) {return n >= 3;})</code> should return <code>[3, 4]</code>.'
-    testString: 'assert.deepEqual(dropElements([1, 2, 3, 4], function(n) {return n >= 3;}), [3, 4], "<code>dropElements([1, 2, 3, 4], function(n) {return n >= 3;})</code> should return <code>[3, 4]</code>.");'
-  - text: '<code>dropElements([0, 1, 0, 1], function(n) {return n === 1;})</code> should return <code>[1, 0, 1]</code>.'
-    testString: 'assert.deepEqual(dropElements([0, 1, 0, 1], function(n) {return n === 1;}), [1, 0, 1], "<code>dropElements([0, 1, 0, 1], function(n) {return n === 1;})</code> should return <code>[1, 0, 1]</code>.");'
-  - text: '<code>dropElements([1, 2, 3], function(n) {return n > 0;})</code> should return <code>[1, 2, 3]</code>.'
-    testString: 'assert.deepEqual(dropElements([1, 2, 3], function(n) {return n > 0;}), [1, 2, 3], "<code>dropElements([1, 2, 3], function(n) {return n > 0;})</code> should return <code>[1, 2, 3]</code>.");'
-  - text: '<code>dropElements([1, 2, 3, 4], function(n) {return n > 5;})</code> should return <code>[]</code>.'
-    testString: 'assert.deepEqual(dropElements([1, 2, 3, 4], function(n) {return n > 5;}), [], "<code>dropElements([1, 2, 3, 4], function(n) {return n > 5;})</code> should return <code>[]</code>.");'
-  - text: '<code>dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})</code> should return <code>[7, 4]</code>.'
-    testString: 'assert.deepEqual(dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;}), [7, 4], "<code>dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})</code> should return <code>[7, 4]</code>.");'
-  - text: '<code>dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})</code> should return <code>[3, 9, 2]</code>.'
-    testString: 'assert.deepEqual(dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;}), [3, 9, 2], "<code>dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})</code> should return <code>[3, 9, 2]</code>.");'
+  - text: <code>dropElements([1, 2, 3, 4], function(n) {return n >= 3;})</code> should return <code>[3, 4]</code>.
+    testString: assert.deepEqual(dropElements([1, 2, 3, 4], function(n) {return n >= 3;}), [3, 4], '<code>dropElements([1, 2, 3, 4], function(n) {return n >= 3;})</code> should return <code>[3, 4]</code>.');
+  - text: <code>dropElements([0, 1, 0, 1], function(n) {return n === 1;})</code> should return <code>[1, 0, 1]</code>.
+    testString: assert.deepEqual(dropElements([0, 1, 0, 1], function(n) {return n === 1;}), [1, 0, 1], '<code>dropElements([0, 1, 0, 1], function(n) {return n === 1;})</code> should return <code>[1, 0, 1]</code>.');
+  - text: <code>dropElements([1, 2, 3], function(n) {return n > 0;})</code> should return <code>[1, 2, 3]</code>.
+    testString: assert.deepEqual(dropElements([1, 2, 3], function(n) {return n > 0;}), [1, 2, 3], '<code>dropElements([1, 2, 3], function(n) {return n > 0;})</code> should return <code>[1, 2, 3]</code>.');
+  - text: <code>dropElements([1, 2, 3, 4], function(n) {return n > 5;})</code> should return <code>[]</code>.
+    testString: assert.deepEqual(dropElements([1, 2, 3, 4], function(n) {return n > 5;}), [], '<code>dropElements([1, 2, 3, 4], function(n) {return n > 5;})</code> should return <code>[]</code>.');
+  - text: <code>dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})</code> should return <code>[7, 4]</code>.
+    testString: assert.deepEqual(dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;}), [7, 4], '<code>dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;})</code> should return <code>[7, 4]</code>.');
+  - text: <code>dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})</code> should return <code>[3, 9, 2]</code>.
+    testString: assert.deepEqual(dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;}), [3, 9, 2], '<code>dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;})</code> should return <code>[3, 9, 2]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.english.md
index 3a0474a370..f204d4a6f6 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.english.md
@@ -25,23 +25,23 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: '<code>truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")</code> should return true.'
-    testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"), true, "<code>truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")</code> should return true.");'
+    testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"), true, ''<code>truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy", "sex": "male"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")</code> should return true.'');'
   - text: '<code>truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")</code> should return false.'
-    testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"), false, "<code>truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")</code> should return false.");'
+    testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex"), false, ''<code>truthCheck([{"user": "Tinky-Winky", "sex": "male"}, {"user": "Dipsy"}, {"user": "Laa-Laa", "sex": "female"}, {"user": "Po", "sex": "female"}], "sex")</code> should return false.'');'
   - text: '<code>truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age")</code> should return false.'
-    testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 2}, {"user": "Dipsy", "sex": "male", "age": 0}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age"), false, "<code>truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age")</code> should return false.");'
+    testString: 'assert.strictEqual(truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 2}, {"user": "Dipsy", "sex": "male", "age": 0}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age"), false, ''<code>truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age")</code> should return false.'');'
   - text: '<code>truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat")</code> should return false'
-    testString: 'assert.strictEqual(truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat"), false, "<code>truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat")</code> should return false");'
+    testString: 'assert.strictEqual(truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat"), false, ''<code>truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true}, {"name": "FastFoward", "onBoat": null}], "onBoat")</code> should return false'');'
   - text: '<code>truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat")</code> should return true'
-    testString: 'assert.strictEqual(truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat"), true, "<code>truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat")</code> should return true");'
+    testString: 'assert.strictEqual(truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat"), true, ''<code>truthCheck([{"name": "Pete", "onBoat": true}, {"name": "Repeat", "onBoat": true, "alias": "Repete"}, {"name": "FastFoward", "onBoat": true}], "onBoat")</code> should return true'');'
   - text: '<code>truthCheck([{"single": "yes"}], "single")</code> should return true'
-    testString: 'assert.strictEqual(truthCheck([{"single": "yes"}], "single"), true, "<code>truthCheck([{"single": "yes"}], "single")</code> should return true");'
+    testString: 'assert.strictEqual(truthCheck([{"single": "yes"}], "single"), true, ''<code>truthCheck([{"single": "yes"}], "single")</code> should return true'');'
   - text: '<code>truthCheck([{"single": ""}, {"single": "double"}], "single")</code> should return false'
-    testString: 'assert.strictEqual(truthCheck([{"single": ""}, {"single": "double"}], "single"), false, "<code>truthCheck([{"single": ""}, {"single": "double"}], "single")</code> should return false");'
+    testString: 'assert.strictEqual(truthCheck([{"single": ""}, {"single": "double"}], "single"), false, ''<code>truthCheck([{"single": ""}, {"single": "double"}], "single")</code> should return false'');'
   - text: '<code>truthCheck([{"single": "double"}, {"single": undefined}], "single")</code> should return false'
-    testString: 'assert.strictEqual(truthCheck([{"single": "double"}, {"single": undefined}], "single"), false, "<code>truthCheck([{"single": "double"}, {"single": undefined}], "single")</code> should return false");'
+    testString: 'assert.strictEqual(truthCheck([{"single": "double"}, {"single": undefined}], "single"), false, ''<code>truthCheck([{"single": "double"}, {"single": undefined}], "single")</code> should return false'');'
   - text: '<code>truthCheck([{"single": "double"}, {"single": NaN}], "single")</code> should return false'
-    testString: 'assert.strictEqual(truthCheck([{"single": "double"}, {"single": NaN}], "single"), false, "<code>truthCheck([{"single": "double"}, {"single": NaN}], "single")</code> should return false");'
+    testString: 'assert.strictEqual(truthCheck([{"single": "double"}, {"single": NaN}], "single"), false, ''<code>truthCheck([{"single": "double"}, {"single": NaN}], "single")</code> should return false'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/make-a-person.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/make-a-person.english.md
index 409e69fa96..e2357bd8f2 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/make-a-person.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/make-a-person.english.md
@@ -30,29 +30,29 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>Object.keys(bob).length</code> should return 6.
-    testString: 'assert.deepEqual(Object.keys(bob).length, 6, "<code>Object.keys(bob).length</code> should return 6.");'
+    testString: assert.deepEqual(Object.keys(bob).length, 6, '<code>Object.keys(bob).length</code> should return 6.');
   - text: <code>bob instanceof Person</code> should return true.
-    testString: 'assert.deepEqual(bob instanceof Person, true, "<code>bob instanceof Person</code> should return true.");'
+    testString: assert.deepEqual(bob instanceof Person, true, '<code>bob instanceof Person</code> should return true.');
   - text: <code>bob.firstName</code> should return undefined.
-    testString: 'assert.deepEqual(bob.firstName, undefined, "<code>bob.firstName</code> should return undefined.");'
+    testString: assert.deepEqual(bob.firstName, undefined, '<code>bob.firstName</code> should return undefined.');
   - text: <code>bob.lastName</code> should return undefined.
-    testString: 'assert.deepEqual(bob.lastName, undefined, "<code>bob.lastName</code> should return undefined.");'
+    testString: assert.deepEqual(bob.lastName, undefined, '<code>bob.lastName</code> should return undefined.');
   - text: <code>bob.getFirstName()</code> should return "Bob".
-    testString: 'assert.deepEqual(bob.getFirstName(), "Bob", "<code>bob.getFirstName()</code> should return "Bob".");'
+    testString: assert.deepEqual(bob.getFirstName(), 'Bob', '<code>bob.getFirstName()</code> should return "Bob".');
   - text: <code>bob.getLastName()</code> should return "Ross".
-    testString: 'assert.deepEqual(bob.getLastName(), "Ross", "<code>bob.getLastName()</code> should return "Ross".");'
+    testString: assert.deepEqual(bob.getLastName(), 'Ross', '<code>bob.getLastName()</code> should return "Ross".');
   - text: <code>bob.getFullName()</code> should return "Bob Ross".
-    testString: 'assert.deepEqual(bob.getFullName(), "Bob Ross", "<code>bob.getFullName()</code> should return "Bob Ross".");'
+    testString: assert.deepEqual(bob.getFullName(), 'Bob Ross', '<code>bob.getFullName()</code> should return "Bob Ross".');
   - text: <code>bob.getFullName()</code> should return "Haskell Ross" after <code>bob.setFirstName("Haskell")</code>.
-    testString: 'assert.strictEqual((function () { bob.setFirstName("Haskell"); return bob.getFullName(); })(), "Haskell Ross", "<code>bob.getFullName()</code> should return "Haskell Ross" after <code>bob.setFirstName("Haskell")</code>.");'
+    testString: assert.strictEqual((function () { bob.setFirstName("Haskell"); return bob.getFullName(); })(), 'Haskell Ross', '<code>bob.getFullName()</code> should return "Haskell Ross" after <code>bob.setFirstName("Haskell")</code>.');
   - text: <code>bob.getFullName()</code> should return "Haskell Curry" after <code>bob.setLastName("Curry")</code>.
-    testString: 'assert.strictEqual((function () { var _bob=new Person("Haskell Ross"); _bob.setLastName("Curry"); return _bob.getFullName(); })(), "Haskell Curry", "<code>bob.getFullName()</code> should return "Haskell Curry" after <code>bob.setLastName("Curry")</code>.");'
+    testString: assert.strictEqual((function () { var _bob=new Person('Haskell Ross'); _bob.setLastName("Curry"); return _bob.getFullName(); })(), 'Haskell Curry', '<code>bob.getFullName()</code> should return "Haskell Curry" after <code>bob.setLastName("Curry")</code>.');
   - text: <code>bob.getFullName()</code> should return "Haskell Curry" after <code>bob.setFullName("Haskell Curry")</code>.
-    testString: 'assert.strictEqual((function () { bob.setFullName("Haskell Curry"); return bob.getFullName(); })(), "Haskell Curry", "<code>bob.getFullName()</code> should return "Haskell Curry" after <code>bob.setFullName("Haskell Curry")</code>.");'
+    testString: assert.strictEqual((function () { bob.setFullName("Haskell Curry"); return bob.getFullName(); })(), 'Haskell Curry', '<code>bob.getFullName()</code> should return "Haskell Curry" after <code>bob.setFullName("Haskell Curry")</code>.');
   - text: <code>bob.getFirstName()</code> should return "Haskell" after <code>bob.setFullName("Haskell Curry")</code>.
-    testString: 'assert.strictEqual((function () { bob.setFullName("Haskell Curry"); return bob.getFirstName(); })(), "Haskell", "<code>bob.getFirstName()</code> should return "Haskell" after <code>bob.setFullName("Haskell Curry")</code>.");'
+    testString: assert.strictEqual((function () { bob.setFullName("Haskell Curry"); return bob.getFirstName(); })(), 'Haskell', '<code>bob.getFirstName()</code> should return "Haskell" after <code>bob.setFullName("Haskell Curry")</code>.');
   - text: <code>bob.getLastName()</code> should return "Curry" after <code>bob.setFullName("Haskell Curry")</code>.
-    testString: 'assert.strictEqual((function () { bob.setFullName("Haskell Curry"); return bob.getLastName(); })(), "Curry", "<code>bob.getLastName()</code> should return "Curry" after <code>bob.setFullName("Haskell Curry")</code>.");'
+    testString: assert.strictEqual((function () { bob.setFullName("Haskell Curry"); return bob.getLastName(); })(), 'Curry', '<code>bob.getLastName()</code> should return "Curry" after <code>bob.setFullName("Haskell Curry")</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/map-the-debris.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/map-the-debris.english.md
index 94dad30aa9..51e14db43d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/map-the-debris.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/map-the-debris.english.md
@@ -25,9 +25,9 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: '<code>orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}])</code> should return <code>[{name: "sputnik", orbitalPeriod: 86400}]</code>.'
-    testString: 'assert.deepEqual(orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]), [{name: "sputnik", orbitalPeriod: 86400}], "<code>orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}])</code> should return <code>[{name: "sputnik", orbitalPeriod: 86400}]</code>.");'
+    testString: 'assert.deepEqual(orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]), [{name: "sputnik", orbitalPeriod: 86400}], ''<code>orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}])</code> should return <code>[{name: "sputnik", orbitalPeriod: 86400}]</code>.'');'
   - text: '<code>orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}])</code> should return <code>[{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}]</code>.'
-    testString: 'assert.deepEqual(orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}]), [{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}], "<code>orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}])</code> should return <code>[{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}]</code>.");'
+    testString: 'assert.deepEqual(orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}]), [{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}], ''<code>orbitalPeriod([{name: "iss", avgAlt: 413.6}, {name: "hubble", avgAlt: 556.7}, {name: "moon", avgAlt: 378632.553}])</code> should return <code>[{name : "iss", orbitalPeriod: 5557}, {name: "hubble", orbitalPeriod: 5734}, {name: "moon", orbitalPeriod: 2377399}]</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.english.md
index ff4cea0f46..a49bab0ece 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.english.md
@@ -23,15 +23,15 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>fearNotLetter("abce")</code> should return "d".
-    testString: 'assert.deepEqual(fearNotLetter("abce"), "d", "<code>fearNotLetter("abce")</code> should return "d".");'
+    testString: assert.deepEqual(fearNotLetter('abce'), 'd', '<code>fearNotLetter("abce")</code> should return "d".');
   - text: <code>fearNotLetter("abcdefghjklmno")</code> should return "i".
-    testString: 'assert.deepEqual(fearNotLetter("abcdefghjklmno"), "i", "<code>fearNotLetter("abcdefghjklmno")</code> should return "i".");'
+    testString: assert.deepEqual(fearNotLetter('abcdefghjklmno'), 'i', '<code>fearNotLetter("abcdefghjklmno")</code> should return "i".');
   - text: <code>fearNotLetter("stvwx")</code> should return "u".
-    testString: 'assert.deepEqual(fearNotLetter("stvwx"), "u", "<code>fearNotLetter("stvwx")</code> should return "u".");'
+    testString: assert.deepEqual(fearNotLetter('stvwx'), 'u', '<code>fearNotLetter("stvwx")</code> should return "u".');
   - text: <code>fearNotLetter("bcdf")</code> should return "e".
-    testString: 'assert.deepEqual(fearNotLetter("bcdf"), "e", "<code>fearNotLetter("bcdf")</code> should return "e".");'
+    testString: assert.deepEqual(fearNotLetter('bcdf'), 'e', '<code>fearNotLetter("bcdf")</code> should return "e".');
   - text: <code>fearNotLetter("abcdefghijklmnopqrstuvwxyz")</code> should return undefined.
-    testString: 'assert.isUndefined(fearNotLetter("abcdefghijklmnopqrstuvwxyz"), "<code>fearNotLetter("abcdefghijklmnopqrstuvwxyz")</code> should return undefined.");'
+    testString: assert.isUndefined(fearNotLetter('abcdefghijklmnopqrstuvwxyz'), '<code>fearNotLetter("abcdefghijklmnopqrstuvwxyz")</code> should return undefined.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.english.md
index 0e4ceac6d7..876c0e294f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.english.md
@@ -25,19 +25,19 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>translatePigLatin("california")</code> should return "aliforniacay".
-    testString: 'assert.deepEqual(translatePigLatin("california"), "aliforniacay", "<code>translatePigLatin("california")</code> should return "aliforniacay".");'
+    testString: assert.deepEqual(translatePigLatin("california"), "aliforniacay", '<code>translatePigLatin("california")</code> should return "aliforniacay".');
   - text: <code>translatePigLatin("paragraphs")</code> should return "aragraphspay".
-    testString: 'assert.deepEqual(translatePigLatin("paragraphs"), "aragraphspay", "<code>translatePigLatin("paragraphs")</code> should return "aragraphspay".");'
+    testString: assert.deepEqual(translatePigLatin("paragraphs"), "aragraphspay", '<code>translatePigLatin("paragraphs")</code> should return "aragraphspay".');
   - text: <code>translatePigLatin("glove")</code> should return "oveglay".
-    testString: 'assert.deepEqual(translatePigLatin("glove"), "oveglay", "<code>translatePigLatin("glove")</code> should return "oveglay".");'
+    testString: assert.deepEqual(translatePigLatin("glove"), "oveglay", '<code>translatePigLatin("glove")</code> should return "oveglay".');
   - text: <code>translatePigLatin("algorithm")</code> should return "algorithmway".
-    testString: 'assert.deepEqual(translatePigLatin("algorithm"), "algorithmway", "<code>translatePigLatin("algorithm")</code> should return "algorithmway".");'
+    testString: assert.deepEqual(translatePigLatin("algorithm"), "algorithmway", '<code>translatePigLatin("algorithm")</code> should return "algorithmway".');
   - text: <code>translatePigLatin("eight")</code> should return "eightway".
-    testString: 'assert.deepEqual(translatePigLatin("eight"), "eightway", "<code>translatePigLatin("eight")</code> should return "eightway".");'
+    testString: assert.deepEqual(translatePigLatin("eight"), "eightway", '<code>translatePigLatin("eight")</code> should return "eightway".');
   - text: Should handle words where the first vowel comes in the end of the word.
-    testString: 'assert.deepEqual(translatePigLatin("schwartz"), "artzschway", "Should handle words where the first vowel comes in the end of the word.");'
+    testString: assert.deepEqual(translatePigLatin("schwartz"), "artzschway", 'Should handle words where the first vowel comes in the end of the word.');
   - text: Should handle words without vowels.
-    testString: 'assert.deepEqual(translatePigLatin("rhythm"), "rhythmay", "Should handle words without vowels.");'
+    testString: assert.deepEqual(translatePigLatin("rhythm"), "rhythmay", 'Should handle words without vowels.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.english.md
index 6f07aaf57d..9c83f792f1 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.english.md
@@ -25,16 +25,16 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>myReplace("Let us go to the store", "store", "mall")</code> should return "Let us go to the mall".'
-    testString: 'assert.deepEqual(myReplace("Let us go to the store", "store", "mall"), "Let us go to the mall", "<code>myReplace("Let us go to the store", "store", "mall")</code> should return "Let us go to the mall".");'
-  - text: '<code>myReplace("He is Sleeping on the couch", "Sleeping", "sitting")</code> should return "He is Sitting on the couch".'
-    testString: 'assert.deepEqual(myReplace("He is Sleeping on the couch", "Sleeping", "sitting"), "He is Sitting on the couch", "<code>myReplace("He is Sleeping on the couch", "Sleeping", "sitting")</code> should return "He is Sitting on the couch".");'
-  - text: '<code>myReplace("This has a spellngi error", "spellngi", "spelling")</code> should return "This has a spelling error".'
-    testString: 'assert.deepEqual(myReplace("This has a spellngi error", "spellngi", "spelling"), "This has a spelling error", "<code>myReplace("This has a spellngi error", "spellngi", "spelling")</code> should return "This has a spelling error".");'
-  - text: '<code>myReplace("His name is Tom", "Tom", "john")</code> should return "His name is John".'
-    testString: 'assert.deepEqual(myReplace("His name is Tom", "Tom", "john"), "His name is John", "<code>myReplace("His name is Tom", "Tom", "john")</code> should return "His name is John".");'
-  - text: '<code>myReplace("Let us get back to more Coding", "Coding", "algorithms")</code> should return "Let us get back to more Algorithms".'
-    testString: 'assert.deepEqual(myReplace("Let us get back to more Coding", "Coding", "algorithms"), "Let us get back to more Algorithms", "<code>myReplace("Let us get back to more Coding", "Coding", "algorithms")</code> should return "Let us get back to more Algorithms".");'
+  - text: <code>myReplace("Let us go to the store", "store", "mall")</code> should return "Let us go to the mall".
+    testString: assert.deepEqual(myReplace("Let us go to the store", "store", "mall"), "Let us go to the mall", '<code>myReplace("Let us go to the store", "store", "mall")</code> should return "Let us go to the mall".');
+  - text: <code>myReplace("He is Sleeping on the couch", "Sleeping", "sitting")</code> should return "He is Sitting on the couch".
+    testString: assert.deepEqual(myReplace("He is Sleeping on the couch", "Sleeping", "sitting"), "He is Sitting on the couch", '<code>myReplace("He is Sleeping on the couch", "Sleeping", "sitting")</code> should return "He is Sitting on the couch".');
+  - text: <code>myReplace("This has a spellngi error", "spellngi", "spelling")</code> should return "This has a spelling error".
+    testString: assert.deepEqual(myReplace("This has a spellngi error", "spellngi", "spelling"), "This has a spelling error", '<code>myReplace("This has a spellngi error", "spellngi", "spelling")</code> should return "This has a spelling error".');
+  - text: <code>myReplace("His name is Tom", "Tom", "john")</code> should return "His name is John".
+    testString: assert.deepEqual(myReplace("His name is Tom", "Tom", "john"), "His name is John", '<code>myReplace("His name is Tom", "Tom", "john")</code> should return "His name is John".');
+  - text: <code>myReplace("Let us get back to more Coding", "Coding", "algorithms")</code> should return "Let us get back to more Algorithms".
+    testString: assert.deepEqual(myReplace("Let us get back to more Coding", "Coding", "algorithms"), "Let us get back to more Algorithms", '<code>myReplace("Let us get back to more Coding", "Coding", "algorithms")</code> should return "Let us get back to more Algorithms".');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.english.md
index ec416eab97..7d45b2a3a0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.english.md
@@ -22,18 +22,18 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>destroyer([1, 2, 3, 1, 2, 3], 2, 3)</code> should return <code>[1, 1]</code>.'
-    testString: 'assert.deepEqual(destroyer([1, 2, 3, 1, 2, 3], 2, 3), [1, 1], "<code>destroyer([1, 2, 3, 1, 2, 3], 2, 3)</code> should return <code>[1, 1]</code>.");'
-  - text: '<code>destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3)</code> should return <code>[1, 5, 1]</code>.'
-    testString: 'assert.deepEqual(destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3), [1, 5, 1], "<code>destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3)</code> should return <code>[1, 5, 1]</code>.");'
-  - text: '<code>destroyer([3, 5, 1, 2, 2], 2, 3, 5)</code> should return <code>[1]</code>.'
-    testString: 'assert.deepEqual(destroyer([3, 5, 1, 2, 2], 2, 3, 5), [1], "<code>destroyer([3, 5, 1, 2, 2], 2, 3, 5)</code> should return <code>[1]</code>.");'
-  - text: '<code>destroyer([2, 3, 2, 3], 2, 3)</code> should return <code>[]</code>.'
-    testString: 'assert.deepEqual(destroyer([2, 3, 2, 3], 2, 3), [], "<code>destroyer([2, 3, 2, 3], 2, 3)</code> should return <code>[]</code>.");'
-  - text: '<code>destroyer(["tree", "hamburger", 53], "tree", 53)</code> should return <code>["hamburger"]</code>.'
-    testString: 'assert.deepEqual(destroyer(["tree", "hamburger", 53], "tree", 53), ["hamburger"], "<code>destroyer(["tree", "hamburger", 53], "tree", 53)</code> should return <code>["hamburger"]</code>.");'
-  - text: '<code>destroyer(["possum", "trollo", 12, "safari", "hotdog", 92, 65, "grandma", "bugati", "trojan", "yacht"], "yacht", "possum", "trollo", "safari", "hotdog", "grandma", "bugati", "trojan")</code> should return <code>[12,92,65]</code>.'
-    testString: 'assert.deepEqual(destroyer(["possum", "trollo", 12, "safari", "hotdog", 92, 65, "grandma", "bugati", "trojan", "yacht"], "yacht", "possum", "trollo", "safari", "hotdog", "grandma", "bugati", "trojan"), [12,92,65], "<code>destroyer(["possum", "trollo", 12, "safari", "hotdog", 92, 65, "grandma", "bugati", "trojan", "yacht"], "yacht", "possum", "trollo", "safari", "hotdog", "grandma", "bugati", "trojan")</code> should return <code>[12,92,65]</code>.");'
+  - text: <code>destroyer([1, 2, 3, 1, 2, 3], 2, 3)</code> should return <code>[1, 1]</code>.
+    testString: assert.deepEqual(destroyer([1, 2, 3, 1, 2, 3], 2, 3), [1, 1], '<code>destroyer([1, 2, 3, 1, 2, 3], 2, 3)</code> should return <code>[1, 1]</code>.');
+  - text: <code>destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3)</code> should return <code>[1, 5, 1]</code>.
+    testString: assert.deepEqual(destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3), [1, 5, 1], '<code>destroyer([1, 2, 3, 5, 1, 2, 3], 2, 3)</code> should return <code>[1, 5, 1]</code>.');
+  - text: <code>destroyer([3, 5, 1, 2, 2], 2, 3, 5)</code> should return <code>[1]</code>.
+    testString: assert.deepEqual(destroyer([3, 5, 1, 2, 2], 2, 3, 5), [1], '<code>destroyer([3, 5, 1, 2, 2], 2, 3, 5)</code> should return <code>[1]</code>.');
+  - text: <code>destroyer([2, 3, 2, 3], 2, 3)</code> should return <code>[]</code>.
+    testString: assert.deepEqual(destroyer([2, 3, 2, 3], 2, 3), [], '<code>destroyer([2, 3, 2, 3], 2, 3)</code> should return <code>[]</code>.');
+  - text: <code>destroyer(["tree", "hamburger", 53], "tree", 53)</code> should return <code>["hamburger"]</code>.
+    testString: assert.deepEqual(destroyer(["tree", "hamburger", 53], "tree", 53), ["hamburger"], '<code>destroyer(["tree", "hamburger", 53], "tree", 53)</code> should return <code>["hamburger"]</code>.');
+  - text: <code>destroyer(["possum", "trollo", 12, "safari", "hotdog", 92, 65, "grandma", "bugati", "trojan", "yacht"], "yacht", "possum", "trollo", "safari", "hotdog", "grandma", "bugati", "trojan")</code> should return <code>[12,92,65]</code>.
+    testString: assert.deepEqual(destroyer(["possum", "trollo", 12, "safari", "hotdog", 92, 65, "grandma", "bugati", "trojan", "yacht"], "yacht", "possum", "trollo", "safari", "hotdog", "grandma", "bugati", "trojan"), [12,92,65], '<code>destroyer(["possum", "trollo", 12, "safari", "hotdog", 92, 65, "grandma", "bugati", "trojan", "yacht"], "yacht", "possum", "trollo", "safari", "hotdog", "grandma", "bugati", "trojan")</code> should return <code>[12,92,65]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.english.md
index 21015305f4..4301ca0a0c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.english.md
@@ -23,18 +23,18 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>smallestCommons([1, 5])</code> should return a number.'
-    testString: 'assert.deepEqual(typeof smallestCommons([1, 5]), "number", "<code>smallestCommons([1, 5])</code> should return a number.");'
-  - text: '<code>smallestCommons([1, 5])</code> should return 60.'
-    testString: 'assert.deepEqual(smallestCommons([1, 5]), 60, "<code>smallestCommons([1, 5])</code> should return 60.");'
-  - text: '<code>smallestCommons([5, 1])</code> should return 60.'
-    testString: 'assert.deepEqual(smallestCommons([5, 1]), 60, "<code>smallestCommons([5, 1])</code> should return 60.");'
-  - text: '<code>smallestCommons([2, 10])</code> should return 2520.'
-    testString: 'assert.deepEqual(smallestCommons([2, 10]), 2520, "<code>smallestCommons([2, 10])</code> should return 2520.");'
-  - text: '<code>smallestCommons([1, 13])</code> should return 360360.'
-    testString: 'assert.deepEqual(smallestCommons([1, 13]), 360360, "<code>smallestCommons([1, 13])</code> should return 360360.");'
-  - text: '<code>smallestCommons([23, 18])</code> should return 6056820.'
-    testString: 'assert.deepEqual(smallestCommons([23, 18]), 6056820, "<code>smallestCommons([23, 18])</code> should return 6056820.");'
+  - text: <code>smallestCommons([1, 5])</code> should return a number.
+    testString: assert.deepEqual(typeof smallestCommons([1, 5]), 'number', '<code>smallestCommons([1, 5])</code> should return a number.');
+  - text: <code>smallestCommons([1, 5])</code> should return 60.
+    testString: assert.deepEqual(smallestCommons([1, 5]), 60, '<code>smallestCommons([1, 5])</code> should return 60.');
+  - text: <code>smallestCommons([5, 1])</code> should return 60.
+    testString: assert.deepEqual(smallestCommons([5, 1]), 60, '<code>smallestCommons([5, 1])</code> should return 60.');
+  - text: <code>smallestCommons([2, 10])</code> should return 2520.
+    testString: assert.deepEqual(smallestCommons([2, 10]), 2520, '<code>smallestCommons([2, 10])</code> should return 2520.');
+  - text: <code>smallestCommons([1, 13])</code> should return 360360.
+    testString: assert.deepEqual(smallestCommons([1, 13]), 360360, '<code>smallestCommons([1, 13])</code> should return 360360.');
+  - text: <code>smallestCommons([23, 18])</code> should return 6056820.
+    testString: assert.deepEqual(smallestCommons([23, 18]), 6056820, '<code>smallestCommons([23, 18])</code> should return 6056820.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.english.md
index ed42bab143..e8077b88fd 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.english.md
@@ -24,12 +24,12 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1])</code> should return <code>[1, 3, 2, 5, 4]</code>.'
-    testString: 'assert.deepEqual(uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]), [1, 3, 2, 5, 4], "<code>uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1])</code> should return <code>[1, 3, 2, 5, 4]</code>.");'
-  - text: '<code>uniteUnique([1, 2, 3], [5, 2, 1])</code> should return <code>[1, 2, 3, 5]</code>.'
-    testString: 'assert.deepEqual(uniteUnique([1, 2, 3], [5, 2, 1]), [1, 2, 3, 5], "<code>uniteUnique([1, 2, 3], [5, 2, 1])</code> should return <code>[1, 2, 3, 5]</code>.");'
-  - text: '<code>uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8])</code> should return <code>[1, 2, 3, 5, 4, 6, 7, 8]</code>.'
-    testString: 'assert.deepEqual(uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8]), [1, 2, 3, 5, 4, 6, 7, 8], "<code>uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8])</code> should return <code>[1, 2, 3, 5, 4, 6, 7, 8]</code>.");'
+  - text: <code>uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1])</code> should return <code>[1, 3, 2, 5, 4]</code>.
+    testString: assert.deepEqual(uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]), [1, 3, 2, 5, 4], '<code>uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1])</code> should return <code>[1, 3, 2, 5, 4]</code>.');
+  - text: <code>uniteUnique([1, 2, 3], [5, 2, 1])</code> should return <code>[1, 2, 3, 5]</code>.
+    testString: assert.deepEqual(uniteUnique([1, 2, 3], [5, 2, 1]), [1, 2, 3, 5], '<code>uniteUnique([1, 2, 3], [5, 2, 1])</code> should return <code>[1, 2, 3, 5]</code>.');
+  - text: <code>uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8])</code> should return <code>[1, 2, 3, 5, 4, 6, 7, 8]</code>.
+    testString: assert.deepEqual(uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8]), [1, 2, 3, 5, 4, 6, 7, 8], '<code>uniteUnique([1, 2, 3], [5, 2, 1, 4], [2, 1], [6, 7, 8])</code> should return <code>[1, 2, 3, 5, 4, 6, 7, 8]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.english.md
index 39ba21648c..b1570aa13c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.english.md
@@ -22,15 +22,15 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>spinalCase("This Is Spinal Tap")</code> should return <code>"this-is-spinal-tap"</code>.
-    testString: 'assert.deepEqual(spinalCase("This Is Spinal Tap"), "this-is-spinal-tap", "<code>spinalCase("This Is Spinal Tap")</code> should return <code>"this-is-spinal-tap"</code>.");'
+    testString: assert.deepEqual(spinalCase("This Is Spinal Tap"), "this-is-spinal-tap", '<code>spinalCase("This Is Spinal Tap")</code> should return <code>"this-is-spinal-tap"</code>.');
   - text: <code>spinalCase("thisIsSpinal<wbr>Tap")</code> should return <code>"this-is-spinal-tap"</code>.
-    testString: 'assert.strictEqual(spinalCase("thisIsSpinalTap"), "this-is-spinal-tap", "<code>spinalCase("thisIsSpinal<wbr>Tap")</code> should return <code>"this-is-spinal-tap"</code>.");'
+    testString: assert.strictEqual(spinalCase('thisIsSpinalTap'), "this-is-spinal-tap", '<code>spinalCase("thisIsSpinal<wbr>Tap")</code> should return <code>"this-is-spinal-tap"</code>.');
   - text: <code>spinalCase("The_Andy_<wbr>Griffith_Show")</code> should return <code>"the-andy-griffith-show"</code>.
-    testString: 'assert.strictEqual(spinalCase("The_Andy_Griffith_Show"), "the-andy-griffith-show", "<code>spinalCase("The_Andy_<wbr>Griffith_Show")</code> should return <code>"the-andy-griffith-show"</code>.");'
+    testString: assert.strictEqual(spinalCase("The_Andy_Griffith_Show"), "the-andy-griffith-show", '<code>spinalCase("The_Andy_<wbr>Griffith_Show")</code> should return <code>"the-andy-griffith-show"</code>.');
   - text: <code>spinalCase("Teletubbies say Eh-oh")</code> should return <code>"teletubbies-say-eh-oh"</code>.
-    testString: 'assert.strictEqual(spinalCase("Teletubbies say Eh-oh"), "teletubbies-say-eh-oh", "<code>spinalCase("Teletubbies say Eh-oh")</code> should return <code>"teletubbies-say-eh-oh"</code>.");'
+    testString: assert.strictEqual(spinalCase("Teletubbies say Eh-oh"), "teletubbies-say-eh-oh", '<code>spinalCase("Teletubbies say Eh-oh")</code> should return <code>"teletubbies-say-eh-oh"</code>.');
   - text: <code>spinalCase("AllThe-small Things")</code> should return <code>"all-the-small-things"</code>.
-    testString: 'assert.strictEqual(spinalCase("AllThe-small Things"), "all-the-small-things", "<code>spinalCase("AllThe-small Things")</code> should return <code>"all-the-small-things"</code>.");'
+    testString: assert.strictEqual(spinalCase("AllThe-small Things"), "all-the-small-things", '<code>spinalCase("AllThe-small Things")</code> should return <code>"all-the-small-things"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.english.md
index 03636ad5a7..0ca0a89131 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.english.md
@@ -21,14 +21,14 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.'
-    testString: 'assert.deepEqual(steamrollArray([[["a"]], [["b"]]]), ["a", "b"], "<code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.");'
-  - text: '<code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.'
-    testString: 'assert.deepEqual(steamrollArray([1, [2], [3, [[4]]]]), [1, 2, 3, 4], "<code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.");'
-  - text: '<code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.'
-    testString: 'assert.deepEqual(steamrollArray([1, [], [3, [[4]]]]), [1, 3, 4], "<code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.");'
-  - text: '<code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.'
-    testString: 'assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4], "<code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.");'
+  - text: <code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.
+    testString: assert.deepEqual(steamrollArray([[["a"]], [["b"]]]), ["a", "b"], '<code>steamrollArray([[["a"]], [["b"]]])</code> should return <code>["a", "b"]</code>.');
+  - text: <code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.
+    testString: assert.deepEqual(steamrollArray([1, [2], [3, [[4]]]]), [1, 2, 3, 4], '<code>steamrollArray([1, [2], [3, [[4]]]])</code> should return <code>[1, 2, 3, 4]</code>.');
+  - text: <code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.
+    testString: assert.deepEqual(steamrollArray([1, [], [3, [[4]]]]), [1, 3, 4], '<code>steamrollArray([1, [], [3, [[4]]]])</code> should return <code>[1, 3, 4]</code>.');
+  - text: <code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.
+    testString: assert.deepEqual(steamrollArray([1, {}, [3, [[4]]]]), [1, {}, 3, 4], '<code>steamrollArray([1, {}, [3, [[4]]]])</code> should return <code>[1, {}, 3, 4]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.english.md
index 8b5bd44a04..113617b1bb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.english.md
@@ -22,16 +22,16 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>sumAll([1, 4])</code> should return a number.'
-    testString: 'assert(typeof sumAll([1, 4]) === "number", "<code>sumAll([1, 4])</code> should return a number.");'
-  - text: '<code>sumAll([1, 4])</code> should return 10.'
-    testString: 'assert.deepEqual(sumAll([1, 4]), 10, "<code>sumAll([1, 4])</code> should return 10.");'
-  - text: '<code>sumAll([4, 1])</code> should return 10.'
-    testString: 'assert.deepEqual(sumAll([4, 1]), 10, "<code>sumAll([4, 1])</code> should return 10.");'
-  - text: '<code>sumAll([5, 10])</code> should return 45.'
-    testString: 'assert.deepEqual(sumAll([5, 10]), 45, "<code>sumAll([5, 10])</code> should return 45.");'
-  - text: '<code>sumAll([10, 5])</code> should return 45.'
-    testString: 'assert.deepEqual(sumAll([10, 5]), 45, "<code>sumAll([10, 5])</code> should return 45.");'
+  - text: <code>sumAll([1, 4])</code> should return a number.
+    testString: assert(typeof sumAll([1, 4]) === 'number', '<code>sumAll([1, 4])</code> should return a number.');
+  - text: <code>sumAll([1, 4])</code> should return 10.
+    testString: assert.deepEqual(sumAll([1, 4]), 10, '<code>sumAll([1, 4])</code> should return 10.');
+  - text: <code>sumAll([4, 1])</code> should return 10.
+    testString: assert.deepEqual(sumAll([4, 1]), 10, '<code>sumAll([4, 1])</code> should return 10.');
+  - text: <code>sumAll([5, 10])</code> should return 45.
+    testString: assert.deepEqual(sumAll([5, 10]), 45, '<code>sumAll([5, 10])</code> should return 45.');
+  - text: <code>sumAll([10, 5])</code> should return 45.
+    testString: assert.deepEqual(sumAll([10, 5]), 45, '<code>sumAll([10, 5])</code> should return 45.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.english.md
index dfada3db5f..ddb12e73db 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.english.md
@@ -24,17 +24,17 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>sumFibs(1)</code> should return a number.
-    testString: 'assert(typeof sumFibs(1) === "number", "<code>sumFibs(1)</code> should return a number.");'
+    testString: assert(typeof sumFibs(1) === "number", '<code>sumFibs(1)</code> should return a number.');
   - text: <code>sumFibs(1000)</code> should return 1785.
-    testString: 'assert(sumFibs(1000) === 1785, "<code>sumFibs(1000)</code> should return 1785.");'
+    testString: assert(sumFibs(1000) === 1785, '<code>sumFibs(1000)</code> should return 1785.');
   - text: <code>sumFibs(4000000)</code> should return 4613732.
-    testString: 'assert(sumFibs(4000000) === 4613732, "<code>sumFibs(4000000)</code> should return 4613732.");'
+    testString: assert(sumFibs(4000000) === 4613732, '<code>sumFibs(4000000)</code> should return 4613732.');
   - text: <code>sumFibs(4)</code> should return 5.
-    testString: 'assert(sumFibs(4) === 5, "<code>sumFibs(4)</code> should return 5.");'
+    testString: assert(sumFibs(4) === 5, '<code>sumFibs(4)</code> should return 5.');
   - text: <code>sumFibs(75024)</code> should return 60696.
-    testString: 'assert(sumFibs(75024) === 60696, "<code>sumFibs(75024)</code> should return 60696.");'
+    testString: assert(sumFibs(75024) === 60696, '<code>sumFibs(75024)</code> should return 60696.');
   - text: <code>sumFibs(75025)</code> should return 135721.
-    testString: 'assert(sumFibs(75025) === 135721, "<code>sumFibs(75025)</code> should return 135721.");'
+    testString: assert(sumFibs(75025) === 135721, '<code>sumFibs(75025)</code> should return 135721.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.english.md
index 61d22c221b..2e98611787 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.english.md
@@ -24,11 +24,11 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>sumPrimes(10)</code> should return a number.
-    testString: 'assert.deepEqual(typeof sumPrimes(10), "number", "<code>sumPrimes(10)</code> should return a number.");'
+    testString: assert.deepEqual(typeof sumPrimes(10), 'number', '<code>sumPrimes(10)</code> should return a number.');
   - text: <code>sumPrimes(10)</code> should return 17.
-    testString: 'assert.deepEqual(sumPrimes(10), 17, "<code>sumPrimes(10)</code> should return 17.");'
+    testString: assert.deepEqual(sumPrimes(10), 17, '<code>sumPrimes(10)</code> should return 17.');
   - text: <code>sumPrimes(977)</code> should return 73156.
-    testString: 'assert.deepEqual(sumPrimes(977), 73156, "<code>sumPrimes(977)</code> should return 73156.");'
+    testString: assert.deepEqual(sumPrimes(977), 73156, '<code>sumPrimes(977)</code> should return 73156.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.english.md
index 51dc172919..3e41f8a47f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.english.md
@@ -23,17 +23,17 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: '<code>whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" })</code> should return <code>[{ first: "Tybalt", last: "Capulet" }]</code>.'
-    testString: 'assert.deepEqual(whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" }), [{ first: "Tybalt", last: "Capulet" }], "<code>whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" })</code> should return <code>[{ first: "Tybalt", last: "Capulet" }]</code>.");'
+    testString: 'assert.deepEqual(whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" }), [{ first: "Tybalt", last: "Capulet" }], ''<code>whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" })</code> should return <code>[{ first: "Tybalt", last: "Capulet" }]</code>.'');'
   - text: '<code>whatIsInAName([{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], { "apple": 1 })</code> should return <code>[{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }]</code>.'
-    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], { "apple": 1 }), [{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], "<code>whatIsInAName([{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], { "apple": 1 })</code> should return <code>[{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }]</code>.");'
+    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], { "apple": 1 }), [{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], ''<code>whatIsInAName([{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }], { "apple": 1 })</code> should return <code>[{ "apple": 1 }, { "apple": 1 }, { "apple": 1, "bat": 2 }]</code>.'');'
   - text: '<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "bat": 2 })</code> should return <code>[{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }]</code>.'
-    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1, "bat": 2 }, { "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "bat": 2 }), [{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], "<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "bat": 2 })</code> should return <code>[{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }]</code>.");'
+    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1, "bat": 2 }, { "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "bat": 2 }), [{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], ''<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "bat": 2 })</code> should return <code>[{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie": 2 }]</code>.'');'
   - text: '<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "cookie": 2 })</code> should return <code>[{ "apple": 1, "bat": 2, "cookie": 2 }]</code>.'
-    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "cookie": 2 }), [{ "apple": 1, "bat": 2, "cookie": 2 }], "<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "cookie": 2 })</code> should return <code>[{ "apple": 1, "bat": 2, "cookie": 2 }]</code>.");'
+    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "cookie": 2 }), [{ "apple": 1, "bat": 2, "cookie": 2 }], ''<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }], { "apple": 1, "cookie": 2 })</code> should return <code>[{ "apple": 1, "bat": 2, "cookie": 2 }]</code>.'');'
   - text: '<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }, { "bat":2 }], { "apple": 1, "bat": 2 })</code> should return <code>[{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie":2 }]</code>.'
-    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }, {"bat":2}], { "apple": 1, "bat": 2 }), [{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie":2 }], "<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }, { "bat":2 }], { "apple": 1, "bat": 2 })</code> should return <code>[{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie":2 }]</code>.");'
+    testString: 'assert.deepEqual(whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }, {"bat":2}], { "apple": 1, "bat": 2 }), [{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie":2 }], ''<code>whatIsInAName([{ "apple": 1, "bat": 2 }, { "apple": 1 }, { "apple": 1, "bat": 2, "cookie": 2 }, { "bat":2 }], { "apple": 1, "bat": 2 })</code> should return <code>[{ "apple": 1, "bat": 2 }, { "apple": 1, "bat": 2, "cookie":2 }]</code>.'');'
   - text: '<code>whatIsInAName([{"a": 1, "b": 2, "c": 3}], {"a": 1, "b": 9999, "c": 3})</code> should return <code>[]</code>'
-    testString: 'assert.deepEqual(whatIsInAName([{ "a": 1, "b": 2, "c": 3 }], { "a": 1, "b": 9999, "c": 3 }), [], "<code>whatIsInAName([{"a": 1, "b": 2, "c": 3}], {"a": 1, "b": 9999, "c": 3})</code> should return <code>[]</code>");'
+    testString: 'assert.deepEqual(whatIsInAName([{ "a": 1, "b": 2, "c": 3 }], { "a": 1, "b": 9999, "c": 3 }), [], ''<code>whatIsInAName([{"a": 1, "b": 2, "c": 3}], {"a": 1, "b": 9999, "c": 3})</code> should return <code>[]</code>'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.english.md
index 2367f49981..a35614a77d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.english.md
@@ -25,13 +25,13 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>rot13("SERR PBQR PNZC")</code> should decode to <code>FREE CODE CAMP</code>
-    testString: 'assert(rot13("SERR PBQR PNZC") === "FREE CODE CAMP", "<code>rot13("SERR PBQR PNZC")</code> should decode to <code>FREE CODE CAMP</code>");'
+    testString: assert(rot13("SERR PBQR PNZC") === "FREE CODE CAMP", '<code>rot13("SERR PBQR PNZC")</code> should decode to <code>FREE CODE CAMP</code>');
   - text: <code>rot13("SERR CVMMN!")</code> should decode to <code>FREE PIZZA!</code>
-    testString: 'assert(rot13("SERR CVMMN!") === "FREE PIZZA!", "<code>rot13("SERR CVMMN!")</code> should decode to <code>FREE PIZZA!</code>");'
+    testString: assert(rot13("SERR CVMMN!") === "FREE PIZZA!", '<code>rot13("SERR CVMMN!")</code> should decode to <code>FREE PIZZA!</code>');
   - text: <code>rot13("SERR YBIR?")</code> should decode to <code>FREE LOVE?</code>
-    testString: 'assert(rot13("SERR YBIR?") === "FREE LOVE?", "<code>rot13("SERR YBIR?")</code> should decode to <code>FREE LOVE?</code>");'
+    testString: assert(rot13("SERR YBIR?") === "FREE LOVE?", '<code>rot13("SERR YBIR?")</code> should decode to <code>FREE LOVE?</code>');
   - text: <code>rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.")</code> should decode to <code>THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.</code>
-    testString: 'assert(rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.") === "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.", "<code>rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.")</code> should decode to <code>THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.</code>");'
+    testString: assert(rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.") === "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.", '<code>rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.")</code> should decode to <code>THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.english.md
index 25f24a1e09..3b54ed501a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.english.md
@@ -27,18 +27,18 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return an object.'
-    testString: 'assert.deepEqual(Object.prototype.toString.call(checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])), "[object Object]", "<code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return an object.");'
+  - text: <code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return an object.
+    testString: assert.deepEqual(Object.prototype.toString.call(checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])), '[object Object]', '<code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return an object.');
   - text: '<code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return <code>{status: "OPEN", change: [["QUARTER", 0.5]]}</code>.'
-    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]), {status: "OPEN", change: [["QUARTER", 0.5]]}, "<code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return <code>{status: "OPEN", change: [["QUARTER", 0.5]]}</code>.");'
+    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]), {status: "OPEN", change: [["QUARTER", 0.5]]}, ''<code>checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return <code>{status: "OPEN", change: [["QUARTER", 0.5]]}</code>.'');'
   - text: '<code>checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return <code>{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}</code>.'
-    testString: 'assert.deepEqual(checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]), {status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}, "<code>checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return <code>{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}</code>.");'
+    testString: 'assert.deepEqual(checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]), {status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}, ''<code>checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])</code> should return <code>{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}</code>.'');'
   - text: '<code>checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "INSUFFICIENT_FUNDS", change: []}</code>.'
-    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]), {status: "INSUFFICIENT_FUNDS", change: []}, "<code>checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "INSUFFICIENT_FUNDS", change: []}</code>.");'
+    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]), {status: "INSUFFICIENT_FUNDS", change: []}, ''<code>checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "INSUFFICIENT_FUNDS", change: []}</code>.'');'
   - text: '<code>checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "INSUFFICIENT_FUNDS", change: []}</code>.'
-    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]), {status: "INSUFFICIENT_FUNDS", change: []}, "<code>checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "INSUFFICIENT_FUNDS", change: []}</code>.");'
+    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]), {status: "INSUFFICIENT_FUNDS", change: []}, ''<code>checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "INSUFFICIENT_FUNDS", change: []}</code>.'');'
   - text: '<code>checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}</code>.'
-    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]), {status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}, "<code>checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}</code>.");'
+    testString: 'assert.deepEqual(checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]), {status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}, ''<code>checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])</code> should return <code>{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.english.md
index 5b90f94b50..05d0fc40ae 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.english.md
@@ -26,31 +26,31 @@ Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>palindrome("eye")</code> should return a boolean.
-    testString: 'assert(typeof palindrome("eye") === "boolean", "<code>palindrome("eye")</code> should return a boolean.");'
+    testString: assert(typeof palindrome("eye") === "boolean", '<code>palindrome("eye")</code> should return a boolean.');
   - text: <code>palindrome("eye")</code> should return true.
-    testString: 'assert(palindrome("eye") === true, "<code>palindrome("eye")</code> should return true.");'
+    testString: assert(palindrome("eye") === true, '<code>palindrome("eye")</code> should return true.');
   - text: <code>palindrome("_eye")</code> should return true.
-    testString: 'assert(palindrome("_eye") === true, "<code>palindrome("_eye")</code> should return true.");'
+    testString: assert(palindrome("_eye") === true, '<code>palindrome("_eye")</code> should return true.');
   - text: <code>palindrome("race car")</code> should return true.
-    testString: 'assert(palindrome("race car") === true, "<code>palindrome("race car")</code> should return true.");'
+    testString: assert(palindrome("race car") === true, '<code>palindrome("race car")</code> should return true.');
   - text: <code>palindrome("not a palindrome")</code> should return false.
-    testString: 'assert(palindrome("not a palindrome") === false, "<code>palindrome("not a palindrome")</code> should return false.");'
-  - text: '<code>palindrome("A man, a plan, a canal. Panama")</code> should return true.'
-    testString: 'assert(palindrome("A man, a plan, a canal. Panama") === true, "<code>palindrome("A man, a plan, a canal. Panama")</code> should return true.");'
+    testString: assert(palindrome("not a palindrome") === false, '<code>palindrome("not a palindrome")</code> should return false.');
+  - text: <code>palindrome("A man, a plan, a canal. Panama")</code> should return true.
+    testString: assert(palindrome("A man, a plan, a canal. Panama") === true, '<code>palindrome("A man, a plan, a canal. Panama")</code> should return true.');
   - text: <code>palindrome("never odd or even")</code> should return true.
-    testString: 'assert(palindrome("never odd or even") === true, "<code>palindrome("never odd or even")</code> should return true.");'
+    testString: assert(palindrome("never odd or even") === true, '<code>palindrome("never odd or even")</code> should return true.');
   - text: <code>palindrome("nope")</code> should return false.
-    testString: 'assert(palindrome("nope") === false, "<code>palindrome("nope")</code> should return false.");'
+    testString: assert(palindrome("nope") === false, '<code>palindrome("nope")</code> should return false.');
   - text: <code>palindrome("almostomla")</code> should return false.
-    testString: 'assert(palindrome("almostomla") === false, "<code>palindrome("almostomla")</code> should return false.");'
-  - text: '<code>palindrome("My age is 0, 0 si ega ym.")</code> should return true.'
-    testString: 'assert(palindrome("My age is 0, 0 si ega ym.") === true, "<code>palindrome("My age is 0, 0 si ega ym.")</code> should return true.");'
+    testString: assert(palindrome("almostomla") === false, '<code>palindrome("almostomla")</code> should return false.');
+  - text: <code>palindrome("My age is 0, 0 si ega ym.")</code> should return true.
+    testString: assert(palindrome("My age is 0, 0 si ega ym.") === true, '<code>palindrome("My age is 0, 0 si ega ym.")</code> should return true.');
   - text: <code>palindrome("1 eye for of 1 eye.")</code> should return false.
-    testString: 'assert(palindrome("1 eye for of 1 eye.") === false, "<code>palindrome("1 eye for of 1 eye.")</code> should return false.");'
+    testString: assert(palindrome("1 eye for of 1 eye.") === false, '<code>palindrome("1 eye for of 1 eye.")</code> should return false.');
   - text: '<code>palindrome("0_0 (: /-\ :) 0-0")</code> should return true.'
-    testString: 'assert(palindrome("0_0 (: /-\ :) 0-0") === true, "<code>palindrome("0_0 (: /-\ :) 0-0")</code> should return true.");'
+    testString: 'assert(palindrome("0_0 (: /-\ :) 0-0") === true, ''<code>palindrome("0_0 (: /-\ :) 0-0")</code> should return true.'');'
   - text: <code>palindrome("five|\_/|four")</code> should return false.
-    testString: 'assert(palindrome("five|\_/|four") === false, "<code>palindrome("five|\_/|four")</code> should return false.");'
+    testString: assert(palindrome("five|\_/|four") === false, '<code>palindrome("five|\_/|four")</code> should return false.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.english.md
index 034bdc432f..babc95b2b4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.english.md
@@ -23,57 +23,57 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>convertToRoman(2)</code> should return "II".
-    testString: 'assert.deepEqual(convertToRoman(2), "II", "<code>convertToRoman(2)</code> should return "II".");'
+    testString: assert.deepEqual(convertToRoman(2), "II", '<code>convertToRoman(2)</code> should return "II".');
   - text: <code>convertToRoman(3)</code> should return "III".
-    testString: 'assert.deepEqual(convertToRoman(3), "III", "<code>convertToRoman(3)</code> should return "III".");'
+    testString: assert.deepEqual(convertToRoman(3), "III", '<code>convertToRoman(3)</code> should return "III".');
   - text: <code>convertToRoman(4)</code> should return "IV".
-    testString: 'assert.deepEqual(convertToRoman(4), "IV", "<code>convertToRoman(4)</code> should return "IV".");'
+    testString: assert.deepEqual(convertToRoman(4), "IV", '<code>convertToRoman(4)</code> should return "IV".');
   - text: <code>convertToRoman(5)</code> should return "V".
-    testString: 'assert.deepEqual(convertToRoman(5), "V", "<code>convertToRoman(5)</code> should return "V".");'
+    testString: assert.deepEqual(convertToRoman(5), "V", '<code>convertToRoman(5)</code> should return "V".');
   - text: <code>convertToRoman(9)</code> should return "IX".
-    testString: 'assert.deepEqual(convertToRoman(9), "IX", "<code>convertToRoman(9)</code> should return "IX".");'
+    testString: assert.deepEqual(convertToRoman(9), "IX", '<code>convertToRoman(9)</code> should return "IX".');
   - text: <code>convertToRoman(12)</code> should return "XII".
-    testString: 'assert.deepEqual(convertToRoman(12), "XII", "<code>convertToRoman(12)</code> should return "XII".");'
+    testString: assert.deepEqual(convertToRoman(12), "XII", '<code>convertToRoman(12)</code> should return "XII".');
   - text: <code>convertToRoman(16)</code> should return "XVI".
-    testString: 'assert.deepEqual(convertToRoman(16), "XVI", "<code>convertToRoman(16)</code> should return "XVI".");'
+    testString: assert.deepEqual(convertToRoman(16), "XVI", '<code>convertToRoman(16)</code> should return "XVI".');
   - text: <code>convertToRoman(29)</code> should return "XXIX".
-    testString: 'assert.deepEqual(convertToRoman(29), "XXIX", "<code>convertToRoman(29)</code> should return "XXIX".");'
+    testString: assert.deepEqual(convertToRoman(29), "XXIX", '<code>convertToRoman(29)</code> should return "XXIX".');
   - text: <code>convertToRoman(44)</code> should return "XLIV".
-    testString: 'assert.deepEqual(convertToRoman(44), "XLIV", "<code>convertToRoman(44)</code> should return "XLIV".");'
+    testString: assert.deepEqual(convertToRoman(44), "XLIV", '<code>convertToRoman(44)</code> should return "XLIV".');
   - text: <code>convertToRoman(45)</code> should return "XLV"
-    testString: 'assert.deepEqual(convertToRoman(45), "XLV", "<code>convertToRoman(45)</code> should return "XLV"");'
+    testString: assert.deepEqual(convertToRoman(45), "XLV", '<code>convertToRoman(45)</code> should return "XLV"');
   - text: <code>convertToRoman(68)</code> should return "LXVIII"
-    testString: 'assert.deepEqual(convertToRoman(68), "LXVIII", "<code>convertToRoman(68)</code> should return "LXVIII"");'
+    testString: assert.deepEqual(convertToRoman(68), "LXVIII", '<code>convertToRoman(68)</code> should return "LXVIII"');
   - text: <code>convertToRoman(83)</code> should return "LXXXIII"
-    testString: 'assert.deepEqual(convertToRoman(83), "LXXXIII", "<code>convertToRoman(83)</code> should return "LXXXIII"");'
+    testString: assert.deepEqual(convertToRoman(83), "LXXXIII", '<code>convertToRoman(83)</code> should return "LXXXIII"');
   - text: <code>convertToRoman(97)</code> should return "XCVII"
-    testString: 'assert.deepEqual(convertToRoman(97), "XCVII", "<code>convertToRoman(97)</code> should return "XCVII"");'
+    testString: assert.deepEqual(convertToRoman(97), "XCVII", '<code>convertToRoman(97)</code> should return "XCVII"');
   - text: <code>convertToRoman(99)</code> should return "XCIX"
-    testString: 'assert.deepEqual(convertToRoman(99), "XCIX", "<code>convertToRoman(99)</code> should return "XCIX"");'
+    testString: assert.deepEqual(convertToRoman(99), "XCIX", '<code>convertToRoman(99)</code> should return "XCIX"');
   - text: <code>convertToRoman(400)</code> should return "CD"
-    testString: 'assert.deepEqual(convertToRoman(400), "CD", "<code>convertToRoman(400)</code> should return "CD"");'
+    testString: assert.deepEqual(convertToRoman(400), "CD", '<code>convertToRoman(400)</code> should return "CD"');
   - text: <code>convertToRoman(500)</code> should return "D"
-    testString: 'assert.deepEqual(convertToRoman(500), "D", "<code>convertToRoman(500)</code> should return "D"");'
+    testString: assert.deepEqual(convertToRoman(500), "D", '<code>convertToRoman(500)</code> should return "D"');
   - text: <code>convertToRoman(501)</code> should return "DI"
-    testString: 'assert.deepEqual(convertToRoman(501), "DI", "<code>convertToRoman(501)</code> should return "DI"");'
+    testString: assert.deepEqual(convertToRoman(501), "DI", '<code>convertToRoman(501)</code> should return "DI"');
   - text: <code>convertToRoman(649)</code> should return "DCXLIX"
-    testString: 'assert.deepEqual(convertToRoman(649), "DCXLIX", "<code>convertToRoman(649)</code> should return "DCXLIX"");'
+    testString: assert.deepEqual(convertToRoman(649), "DCXLIX", '<code>convertToRoman(649)</code> should return "DCXLIX"');
   - text: <code>convertToRoman(798)</code> should return "DCCXCVIII"
-    testString: 'assert.deepEqual(convertToRoman(798), "DCCXCVIII", "<code>convertToRoman(798)</code> should return "DCCXCVIII"");'
+    testString: assert.deepEqual(convertToRoman(798), "DCCXCVIII", '<code>convertToRoman(798)</code> should return "DCCXCVIII"');
   - text: <code>convertToRoman(891)</code> should return "DCCCXCI"
-    testString: 'assert.deepEqual(convertToRoman(891), "DCCCXCI", "<code>convertToRoman(891)</code> should return "DCCCXCI"");'
+    testString: assert.deepEqual(convertToRoman(891), "DCCCXCI", '<code>convertToRoman(891)</code> should return "DCCCXCI"');
   - text: <code>convertToRoman(1000)</code> should return "M"
-    testString: 'assert.deepEqual(convertToRoman(1000), "M", "<code>convertToRoman(1000)</code> should return "M"");'
+    testString: assert.deepEqual(convertToRoman(1000), "M", '<code>convertToRoman(1000)</code> should return "M"');
   - text: <code>convertToRoman(1004)</code> should return "MIV"
-    testString: 'assert.deepEqual(convertToRoman(1004), "MIV", "<code>convertToRoman(1004)</code> should return "MIV"");'
+    testString: assert.deepEqual(convertToRoman(1004), "MIV", '<code>convertToRoman(1004)</code> should return "MIV"');
   - text: <code>convertToRoman(1006)</code> should return "MVI"
-    testString: 'assert.deepEqual(convertToRoman(1006), "MVI", "<code>convertToRoman(1006)</code> should return "MVI"");'
+    testString: assert.deepEqual(convertToRoman(1006), "MVI", '<code>convertToRoman(1006)</code> should return "MVI"');
   - text: <code>convertToRoman(1023)</code> should return "MXXIII"
-    testString: 'assert.deepEqual(convertToRoman(1023), "MXXIII", "<code>convertToRoman(1023)</code> should return "MXXIII"");'
+    testString: assert.deepEqual(convertToRoman(1023), "MXXIII", '<code>convertToRoman(1023)</code> should return "MXXIII"');
   - text: <code>convertToRoman(2014)</code> should return "MMXIV"
-    testString: 'assert.deepEqual(convertToRoman(2014), "MMXIV", "<code>convertToRoman(2014)</code> should return "MMXIV"");'
+    testString: assert.deepEqual(convertToRoman(2014), "MMXIV", '<code>convertToRoman(2014)</code> should return "MMXIV"');
   - text: <code>convertToRoman(3999)</code> should return "MMMCMXCIX"
-    testString: 'assert.deepEqual(convertToRoman(3999), "MMMCMXCIX", "<code>convertToRoman(3999)</code> should return "MMMCMXCIX"");'
+    testString: assert.deepEqual(convertToRoman(3999), "MMMCMXCIX", '<code>convertToRoman(3999)</code> should return "MMMCMXCIX"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.english.md
index 5c0a07b04e..ab6ef5638a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.english.md
@@ -25,59 +25,59 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>telephoneCheck("555-555-5555")</code> should return a boolean.
-    testString: 'assert(typeof telephoneCheck("555-555-5555") === "boolean", "<code>telephoneCheck("555-555-5555")</code> should return a boolean.");'
+    testString: assert(typeof telephoneCheck("555-555-5555") === "boolean", '<code>telephoneCheck("555-555-5555")</code> should return a boolean.');
   - text: <code>telephoneCheck("1 555-555-5555")</code> should return true.
-    testString: 'assert(telephoneCheck("1 555-555-5555") === true, "<code>telephoneCheck("1 555-555-5555")</code> should return true.");'
+    testString: assert(telephoneCheck("1 555-555-5555") === true, '<code>telephoneCheck("1 555-555-5555")</code> should return true.');
   - text: <code>telephoneCheck("1 (555) 555-5555")</code> should return true.
-    testString: 'assert(telephoneCheck("1 (555) 555-5555") === true, "<code>telephoneCheck("1 (555) 555-5555")</code> should return true.");'
+    testString: assert(telephoneCheck("1 (555) 555-5555") === true, '<code>telephoneCheck("1 (555) 555-5555")</code> should return true.');
   - text: <code>telephoneCheck("5555555555")</code> should return true.
-    testString: 'assert(telephoneCheck("5555555555") === true, "<code>telephoneCheck("5555555555")</code> should return true.");'
+    testString: assert(telephoneCheck("5555555555") === true, '<code>telephoneCheck("5555555555")</code> should return true.');
   - text: <code>telephoneCheck("555-555-5555")</code> should return true.
-    testString: 'assert(telephoneCheck("555-555-5555") === true, "<code>telephoneCheck("555-555-5555")</code> should return true.");'
+    testString: assert(telephoneCheck("555-555-5555") === true, '<code>telephoneCheck("555-555-5555")</code> should return true.');
   - text: <code>telephoneCheck("(555)555-5555")</code> should return true.
-    testString: 'assert(telephoneCheck("(555)555-5555") === true, "<code>telephoneCheck("(555)555-5555")</code> should return true.");'
+    testString: assert(telephoneCheck("(555)555-5555") === true, '<code>telephoneCheck("(555)555-5555")</code> should return true.');
   - text: <code>telephoneCheck("1(555)555-5555")</code> should return true.
-    testString: 'assert(telephoneCheck("1(555)555-5555") === true, "<code>telephoneCheck("1(555)555-5555")</code> should return true.");'
+    testString: assert(telephoneCheck("1(555)555-5555") === true, '<code>telephoneCheck("1(555)555-5555")</code> should return true.');
   - text: <code>telephoneCheck("555-5555")</code> should return false.
-    testString: 'assert(telephoneCheck("555-5555") === false, "<code>telephoneCheck("555-5555")</code> should return false.");'
+    testString: assert(telephoneCheck("555-5555") === false, '<code>telephoneCheck("555-5555")</code> should return false.');
   - text: <code>telephoneCheck("5555555")</code> should return false.
-    testString: 'assert(telephoneCheck("5555555") === false, "<code>telephoneCheck("5555555")</code> should return false.");'
+    testString: assert(telephoneCheck("5555555") === false, '<code>telephoneCheck("5555555")</code> should return false.');
   - text: <code>telephoneCheck("1 555)555-5555")</code> should return false.
-    testString: 'assert(telephoneCheck("1 555)555-5555") === false, "<code>telephoneCheck("1 555)555-5555")</code> should return false.");'
+    testString: assert(telephoneCheck("1 555)555-5555") === false, '<code>telephoneCheck("1 555)555-5555")</code> should return false.');
   - text: <code>telephoneCheck("1 555 555 5555")</code> should return true.
-    testString: 'assert(telephoneCheck("1 555 555 5555") === true, "<code>telephoneCheck("1 555 555 5555")</code> should return true.");'
+    testString: assert(telephoneCheck("1 555 555 5555") === true, '<code>telephoneCheck("1 555 555 5555")</code> should return true.');
   - text: <code>telephoneCheck("1 456 789 4444")</code> should return true.
-    testString: 'assert(telephoneCheck("1 456 789 4444") === true, "<code>telephoneCheck("1 456 789 4444")</code> should return true.");'
-  - text: '<code>telephoneCheck("123**&!!asdf#")</code> should return false.'
-    testString: 'assert(telephoneCheck("123**&!!asdf#") === false, "<code>telephoneCheck("123**&!!asdf#")</code> should return false.");'
+    testString: assert(telephoneCheck("1 456 789 4444") === true, '<code>telephoneCheck("1 456 789 4444")</code> should return true.');
+  - text: <code>telephoneCheck("123**&!!asdf#")</code> should return false.
+    testString: assert(telephoneCheck("123**&!!asdf#") === false, '<code>telephoneCheck("123**&!!asdf#")</code> should return false.');
   - text: <code>telephoneCheck("55555555")</code> should return false.
-    testString: 'assert(telephoneCheck("55555555") === false, "<code>telephoneCheck("55555555")</code> should return false.");'
+    testString: assert(telephoneCheck("55555555") === false, '<code>telephoneCheck("55555555")</code> should return false.');
   - text: <code>telephoneCheck("(6054756961)")</code> should return false
-    testString: 'assert(telephoneCheck("(6054756961)") === false, "<code>telephoneCheck("(6054756961)")</code> should return false");'
+    testString: assert(telephoneCheck("(6054756961)") === false, '<code>telephoneCheck("(6054756961)")</code> should return false');
   - text: <code>telephoneCheck("2 (757) 622-7382")</code> should return false.
-    testString: 'assert(telephoneCheck("2 (757) 622-7382") === false, "<code>telephoneCheck("2 (757) 622-7382")</code> should return false.");'
+    testString: assert(telephoneCheck("2 (757) 622-7382") === false, '<code>telephoneCheck("2 (757) 622-7382")</code> should return false.');
   - text: <code>telephoneCheck("0 (757) 622-7382")</code> should return false.
-    testString: 'assert(telephoneCheck("0 (757) 622-7382") === false, "<code>telephoneCheck("0 (757) 622-7382")</code> should return false.");'
+    testString: assert(telephoneCheck("0 (757) 622-7382") === false, '<code>telephoneCheck("0 (757) 622-7382")</code> should return false.');
   - text: <code>telephoneCheck("-1 (757) 622-7382")</code> should return false
-    testString: 'assert(telephoneCheck("-1 (757) 622-7382") === false, "<code>telephoneCheck("-1 (757) 622-7382")</code> should return false");'
+    testString: assert(telephoneCheck("-1 (757) 622-7382") === false, '<code>telephoneCheck("-1 (757) 622-7382")</code> should return false');
   - text: <code>telephoneCheck("2 757 622-7382")</code> should return false.
-    testString: 'assert(telephoneCheck("2 757 622-7382") === false, "<code>telephoneCheck("2 757 622-7382")</code> should return false.");'
+    testString: assert(telephoneCheck("2 757 622-7382") === false, '<code>telephoneCheck("2 757 622-7382")</code> should return false.');
   - text: <code>telephoneCheck("10 (757) 622-7382")</code> should return false.
-    testString: 'assert(telephoneCheck("10 (757) 622-7382") === false, "<code>telephoneCheck("10 (757) 622-7382")</code> should return false.");'
+    testString: assert(telephoneCheck("10 (757) 622-7382") === false, '<code>telephoneCheck("10 (757) 622-7382")</code> should return false.');
   - text: <code>telephoneCheck("27576227382")</code> should return false.
-    testString: 'assert(telephoneCheck("27576227382") === false, "<code>telephoneCheck("27576227382")</code> should return false.");'
+    testString: assert(telephoneCheck("27576227382") === false, '<code>telephoneCheck("27576227382")</code> should return false.');
   - text: <code>telephoneCheck("(275)76227382")</code> should return false.
-    testString: 'assert(telephoneCheck("(275)76227382") === false, "<code>telephoneCheck("(275)76227382")</code> should return false.");'
+    testString: assert(telephoneCheck("(275)76227382") === false, '<code>telephoneCheck("(275)76227382")</code> should return false.');
   - text: <code>telephoneCheck("2(757)6227382")</code> should return false.
-    testString: 'assert(telephoneCheck("2(757)6227382") === false, "<code>telephoneCheck("2(757)6227382")</code> should return false.");'
+    testString: assert(telephoneCheck("2(757)6227382") === false, '<code>telephoneCheck("2(757)6227382")</code> should return false.');
   - text: <code>telephoneCheck("2(757)622-7382")</code> should return false.
-    testString: 'assert(telephoneCheck("2(757)622-7382") === false, "<code>telephoneCheck("2(757)622-7382")</code> should return false.");'
+    testString: assert(telephoneCheck("2(757)622-7382") === false, '<code>telephoneCheck("2(757)622-7382")</code> should return false.');
   - text: <code>telephoneCheck("555)-555-5555")</code> should return false.
-    testString: 'assert(telephoneCheck("555)-555-5555") === false, "<code>telephoneCheck("555)-555-5555")</code> should return false.");'
+    testString: assert(telephoneCheck("555)-555-5555") === false, '<code>telephoneCheck("555)-555-5555")</code> should return false.');
   - text: <code>telephoneCheck("(555-555-5555")</code> should return false.
-    testString: 'assert(telephoneCheck("(555-555-5555") === false, "<code>telephoneCheck("(555-555-5555")</code> should return false.");'
+    testString: assert(telephoneCheck("(555-555-5555") === false, '<code>telephoneCheck("(555-555-5555")</code> should return false.');
   - text: <code>telephoneCheck("(555)5(55?)-5555")</code> should return false.
-    testString: 'assert(telephoneCheck("(555)5(55?)-5555") === false, "<code>telephoneCheck("(555)5(55?)-5555")</code> should return false.");'
+    testString: assert(telephoneCheck("(555)5(55?)-5555") === false, '<code>telephoneCheck("(555)5(55?)-5555")</code> should return false.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.english.md
index ffe4c9e5f3..52a0a2e816 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/add-methods-after-inheritance.english.md
@@ -26,15 +26,15 @@ Add all necessary code so the <code>Dog</code> object inherits from <code>Animal
 ```yml
 tests:
   - text: <code>Animal</code> should not respond to the <code>bark()</code> method.
-    testString: 'assert(typeof Animal.prototype.bark == "undefined", "<code>Animal</code> should not respond to the <code>bark()</code> method.");'
+    testString: assert(typeof Animal.prototype.bark == "undefined", '<code>Animal</code> should not respond to the <code>bark()</code> method.');
   - text: <code>Dog</code> should inherit the <code>eat()</code> method from <code>Animal</code>.
-    testString: 'assert(typeof Dog.prototype.eat == "function", "<code>Dog</code> should inherit the <code>eat()</code> method from <code>Animal</code>.");'
+    testString: assert(typeof Dog.prototype.eat == "function", '<code>Dog</code> should inherit the <code>eat()</code> method from <code>Animal</code>.');
   - text: <code>Dog</code> should have the <code>bark()</code> method as an <code>own</code> property.
-    testString: 'assert(Dog.prototype.hasOwnProperty("bark"), "<code>Dog</code> should have the <code>bark()</code> method as an <code>own</code> property.");'
+    testString: assert(Dog.prototype.hasOwnProperty('bark'), '<code>Dog</code> should have the <code>bark()</code> method as an <code>own</code> property.');
   - text: <code>beagle</code> should be an <code>instanceof</code> <code>Animal</code>.
-    testString: 'assert(beagle instanceof Animal, "<code>beagle</code> should be an <code>instanceof</code> <code>Animal</code>.");'
+    testString: assert(beagle instanceof Animal, '<code>beagle</code> should be an <code>instanceof</code> <code>Animal</code>.');
   - text: The constructor for <code>beagle</code> should be set to <code>Dog</code>.
-    testString: 'assert(beagle.constructor === Dog, "The constructor for <code>beagle</code> should be set to <code>Dog</code>.");'
+    testString: assert(beagle.constructor === Dog, 'The constructor for <code>beagle</code> should be set to <code>Dog</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/change-the-prototype-to-a-new-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/change-the-prototype-to-a-new-object.english.md
index 1d1243b54a..5ec2d0d38d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/change-the-prototype-to-a-new-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/change-the-prototype-to-a-new-object.english.md
@@ -25,13 +25,13 @@ Add the property <code>numLegs</code> and the two methods <code>eat()</code> and
 ```yml
 tests:
   - text: <code>Dog.prototype</code> should be set to a new object.
-    testString: 'assert((/Dog\.prototype\s*?=\s*?{/).test(code), "<code>Dog.prototype</code> should be set to a new object.");'
+    testString: assert((/Dog\.prototype\s*?=\s*?{/).test(code), '<code>Dog.prototype</code> should be set to a new object.');
   - text: <code>Dog.prototype</code> should have the property <code>numLegs</code>.
-    testString: 'assert(Dog.prototype.numLegs !== undefined, "<code>Dog.prototype</code> should have the property <code>numLegs</code>.");'
+    testString: assert(Dog.prototype.numLegs !== undefined, '<code>Dog.prototype</code> should have the property <code>numLegs</code>.');
   - text: <code>Dog.prototype</code> should have the method <code>eat()</code>.
-    testString: 'assert(typeof Dog.prototype.eat === "function", "<code>Dog.prototype</code> should have the method <code>eat()</code>."); '
+    testString: assert(typeof Dog.prototype.eat === 'function', '<code>Dog.prototype</code> should have the method <code>eat()</code>.');
   - text: <code>Dog.prototype</code> should have the method <code>describe()</code>.
-    testString: 'assert(typeof Dog.prototype.describe === "function", "<code>Dog.prototype</code> should have the method <code>describe()</code>."); '
+    testString: assert(typeof Dog.prototype.describe === 'function', '<code>Dog.prototype</code> should have the method <code>describe()</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-basic-javascript-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-basic-javascript-object.english.md
index 1cac6b6aea..c20fef768c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-basic-javascript-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-basic-javascript-object.english.md
@@ -25,11 +25,11 @@ Create a <code>dog</code> <code>object</code> with <code>name</code> and <code>n
 ```yml
 tests:
   - text: <code>dog</code> should be an <code>object</code>.
-    testString: 'assert(typeof(dog) === "object", "<code>dog</code> should be an <code>object</code>.");'
+    testString: assert(typeof(dog) === 'object', '<code>dog</code> should be an <code>object</code>.');
   - text: <code>dog</code> should have a <code>name</code> property set to a <code>string</code>.
-    testString: 'assert(typeof(dog.name) === "string", "<code>dog</code> should have a <code>name</code> property set to a <code>string</code>.");'
+    testString: assert(typeof(dog.name) === 'string', '<code>dog</code> should have a <code>name</code> property set to a <code>string</code>.');
   - text: <code>dog</code> should have a <code>numLegs</code> property set to a <code>number</code>.
-    testString: 'assert(typeof(dog.numLegs) === "number", "<code>dog</code> should have a <code>numLegs</code> property set to a <code>number</code>.");'
+    testString: assert(typeof(dog.numLegs) === 'number', '<code>dog</code> should have a <code>numLegs</code> property set to a <code>number</code>.');
 
 ```
 
@@ -58,7 +58,7 @@ let dog = {
 
 ```js
 let dog = {
-  name: ",
+  name: '',
   numLegs: 4
 };
 ```
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-method-on-an-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-method-on-an-object.english.md
index 877b2afbc5..9a386eaadb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-method-on-an-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/create-a-method-on-an-object.english.md
@@ -24,9 +24,9 @@ Using the <code>dog</code> <code>object</code>, give it a method called <code>sa
 ```yml
 tests:
   - text: <code>dog.sayLegs()</code> should be a function.
-    testString: 'assert(typeof(dog.sayLegs) === "function", "<code>dog.sayLegs()</code> should be a function.");'
+    testString: assert(typeof(dog.sayLegs) === 'function', '<code>dog.sayLegs()</code> should be a function.');
   - text: <code>dog.sayLegs()</code> should return the given string - note that punctuation and spacing matter.
-    testString: 'assert(dog.sayLegs() === "This dog has 4 legs.", "<code>dog.sayLegs()</code> should return the given string - note that punctuation and spacing matter.");'
+    testString: assert(dog.sayLegs() === 'This dog has 4 legs.', '<code>dog.sayLegs()</code> should return the given string - note that punctuation and spacing matter.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/define-a-constructor-function.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/define-a-constructor-function.english.md
index cb24da0aff..0ba8004bf0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/define-a-constructor-function.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/define-a-constructor-function.english.md
@@ -25,11 +25,11 @@ Create a <code>constructor</code>, <code>Dog</code>, with properties <code>name<
 ```yml
 tests:
   - text: <code>Dog</code> should have a <code>name</code> property set to a string.
-    testString: 'assert(typeof (new Dog()).name === "string", "<code>Dog</code> should have a <code>name</code> property set to a string.");'
+    testString: assert(typeof (new Dog()).name === 'string', '<code>Dog</code> should have a <code>name</code> property set to a string.');
   - text: <code>Dog</code> should have a <code>color</code> property set to a string.
-    testString: 'assert(typeof (new Dog()).color === "string", "<code>Dog</code> should have a <code>color</code> property set to a string.");'
+    testString: assert(typeof (new Dog()).color === 'string', '<code>Dog</code> should have a <code>color</code> property set to a string.');
   - text: <code>Dog</code> should have a <code>numLegs</code> property set to a number.
-    testString: 'assert(typeof (new Dog()).numLegs === "number", "<code>Dog</code> should have a <code>numLegs</code> property set to a number.");'
+    testString: assert(typeof (new Dog()).numLegs === 'number', '<code>Dog</code> should have a <code>numLegs</code> property set to a number.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/extend-constructors-to-receive-arguments.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/extend-constructors-to-receive-arguments.english.md
index 31e626e5f4..f765cd2882 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/extend-constructors-to-receive-arguments.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/extend-constructors-to-receive-arguments.english.md
@@ -30,13 +30,13 @@ Create another <code>Dog</code> constructor. This time, set it up to take the pa
 ```yml
 tests:
   - text: <code>Dog</code> should receive an argument for <code>name</code>.
-    testString: 'assert((new Dog("Clifford")).name === "Clifford", "<code>Dog</code> should receive an argument for <code>name</code>.");'
+    testString: assert((new Dog('Clifford')).name === 'Clifford', '<code>Dog</code> should receive an argument for <code>name</code>.');
   - text: <code>Dog</code> should receive an argument for <code>color</code>.
-    testString: 'assert((new Dog("Clifford", "yellow")).color === "yellow", "<code>Dog</code> should receive an argument for <code>color</code>.");'
+    testString: assert((new Dog('Clifford', 'yellow')).color === 'yellow', '<code>Dog</code> should receive an argument for <code>color</code>.');
   - text: <code>Dog</code> should have property <code>numLegs</code> set to 4.
-    testString: 'assert((new Dog("Clifford")).numLegs === 4, "<code>Dog</code> should have property <code>numLegs</code> set to 4.");'
+    testString: assert((new Dog('Clifford')).numLegs === 4, '<code>Dog</code> should have property <code>numLegs</code> set to 4.');
   - text: <code>terrier</code> should be created using the <code>Dog</code> constructor.
-    testString: 'assert(terrier instanceof Dog, "<code>terrier</code> should be created using the <code>Dog</code> constructor.");'
+    testString: assert(terrier instanceof Dog, '<code>terrier</code> should be created using the <code>Dog</code> constructor.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/inherit-behaviors-from-a-supertype.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/inherit-behaviors-from-a-supertype.english.md
index b9ca81f0b4..dde6a8f4c4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/inherit-behaviors-from-a-supertype.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/inherit-behaviors-from-a-supertype.english.md
@@ -29,13 +29,13 @@ Use <code>Object.create</code> to make two instances of <code>Animal</code> name
 ```yml
 tests:
   - text: The <code>duck</code> variable should be defined.
-    testString: 'assert(typeof duck !== "undefined", "The <code>duck</code> variable should be defined.");'
+    testString: assert(typeof duck !== "undefined", 'The <code>duck</code> variable should be defined.');
   - text: The <code>beagle</code> variable should be defined.
-    testString: 'assert(typeof beagle !== "undefined", "The <code>beagle</code> variable should be defined.");'
+    testString: assert(typeof beagle !== "undefined", 'The <code>beagle</code> variable should be defined.');
   - text: <code>duck</code> should have a <code>prototype</code> of <code>Animal</code>.
-    testString: 'assert(duck instanceof Animal, "<code>duck</code> should have a <code>prototype</code> of <code>Animal</code>.");'
+    testString: assert(duck instanceof Animal, '<code>duck</code> should have a <code>prototype</code> of <code>Animal</code>.');
   - text: <code>beagle</code> should have a <code>prototype</code> of <code>Animal</code>.
-    testString: 'assert(beagle instanceof Animal, "<code>beagle</code> should have a <code>prototype</code> of <code>Animal</code>.");'
+    testString: assert(beagle instanceof Animal, '<code>beagle</code> should have a <code>prototype</code> of <code>Animal</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/iterate-over-all-properties.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/iterate-over-all-properties.english.md
index 2561745613..dd7c8de5f9 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/iterate-over-all-properties.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/iterate-over-all-properties.english.md
@@ -23,11 +23,11 @@ Add all of the <code>own</code> properties of <code>beagle</code> to the array <
 ```yml
 tests:
   - text: The <code>ownProps</code> array should include <code>"name"</code>.
-    testString: 'assert(ownProps.indexOf("name") !== -1, "The <code>ownProps</code> array should include <code>"name"</code>.");'
+    testString: assert(ownProps.indexOf('name') !== -1, 'The <code>ownProps</code> array should include <code>"name"</code>.');
   - text: The <code>prototypeProps</code> array should include <code>"numLegs"</code>.
-    testString: 'assert(prototypeProps.indexOf("numLegs") !== -1, "The <code>prototypeProps</code> array should include <code>"numLegs"</code>.");'
+    testString: assert(prototypeProps.indexOf('numLegs') !== -1, 'The <code>prototypeProps</code> array should include <code>"numLegs"</code>.');
   - text: Solve this challenge without using the built in method <code>Object.keys()</code>.
-    testString: 'assert(!/\Object.keys/.test(code), "Solve this challenge without using the built in method <code>Object.keys()</code>.");'
+    testString: assert(!/\Object.keys/.test(code), 'Solve this challenge without using the built in method <code>Object.keys()</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/make-code-more-reusable-with-the-this-keyword.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/make-code-more-reusable-with-the-this-keyword.english.md
index 467461c51f..19915ad904 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/make-code-more-reusable-with-the-this-keyword.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/make-code-more-reusable-with-the-this-keyword.english.md
@@ -26,9 +26,9 @@ Modify the <code>dog.sayLegs</code> method to remove any references to <code>dog
 ```yml
 tests:
   - text: <code>dog.sayLegs()</code> should return the given string.
-    testString: 'assert(dog.sayLegs() === "This dog has 4 legs.", "<code>dog.sayLegs()</code> should return the given string.");'
+    testString: assert(dog.sayLegs() === 'This dog has 4 legs.', '<code>dog.sayLegs()</code> should return the given string.');
   - text: Your code should use the <code>this</code> keyword to access the <code>numLegs</code> property of <code>dog</code>.
-    testString: 'assert(code.match(/this\.numLegs/g), "Your code should use the <code>this</code> keyword to access the <code>numLegs</code> property of <code>dog</code>.");'
+    testString: assert(code.match(/this\.numLegs/g), 'Your code should use the <code>this</code> keyword to access the <code>numLegs</code> property of <code>dog</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/override-inherited-methods.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/override-inherited-methods.english.md
index e255a706e1..400ebd427a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/override-inherited-methods.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/override-inherited-methods.english.md
@@ -30,10 +30,10 @@ Override the <code>fly()</code> method for <code>Penguin</code> so that it retur
 
 ```yml
 tests:
-  - text: '<code>penguin.fly()</code> should return the string "Alas, this is a flightless bird."'
-    testString: 'assert(penguin.fly() === "Alas, this is a flightless bird.", "<code>penguin.fly()</code> should return the string "Alas, this is a flightless bird."");'
+  - text: <code>penguin.fly()</code> should return the string "Alas, this is a flightless bird."
+    testString: assert(penguin.fly() === "Alas, this is a flightless bird.", '<code>penguin.fly()</code> should return the string "Alas, this is a flightless bird."');
   - text: The <code>bird.fly()</code> method should return "I am flying!"
-    testString: 'assert((new Bird()).fly() === "I am flying!", "The <code>bird.fly()</code> method should return "I am flying!"");'
+    testString: assert((new Bird()).fly() === "I am flying!", 'The <code>bird.fly()</code> method should return "I am flying!"');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/remember-to-set-the-constructor-property-when-changing-the-prototype.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/remember-to-set-the-constructor-property-when-changing-the-prototype.english.md
index 62244990bd..6df91c7014 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/remember-to-set-the-constructor-property-when-changing-the-prototype.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/remember-to-set-the-constructor-property-when-changing-the-prototype.english.md
@@ -23,7 +23,7 @@ Define the <code>constructor</code> property on the <code>Dog</code> <code>proto
 ```yml
 tests:
   - text: <code>Dog.prototype</code> should set the <code>constructor</code> property.
-    testString: 'assert(Dog.prototype.constructor === Dog, "<code>Dog.prototype</code> should set the <code>constructor</code> property.");'
+    testString: assert(Dog.prototype.constructor === Dog, '<code>Dog.prototype</code> should set the <code>constructor</code> property.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/reset-an-inherited-constructor-property.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/reset-an-inherited-constructor-property.english.md
index 6cf2efae8b..4e8b29058d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/reset-an-inherited-constructor-property.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/reset-an-inherited-constructor-property.english.md
@@ -24,13 +24,13 @@ Fix the code so <code>duck.constructor</code> and <code>beagle.constructor</code
 ```yml
 tests:
   - text: <code>Bird.prototype</code> should be an instance of <code>Animal</code>.
-    testString: 'assert(Animal.prototype.isPrototypeOf(Bird.prototype), "<code>Bird.prototype</code> should be an instance of <code>Animal</code>.");'
+    testString: assert(Animal.prototype.isPrototypeOf(Bird.prototype), '<code>Bird.prototype</code> should be an instance of <code>Animal</code>.');
   - text: <code>duck.constructor</code> should return <code>Bird</code>.
-    testString: 'assert(duck.constructor === Bird, "<code>duck.constructor</code> should return <code>Bird</code>.");'
+    testString: assert(duck.constructor === Bird, '<code>duck.constructor</code> should return <code>Bird</code>.');
   - text: <code>Dog.prototype</code> should be an instance of <code>Animal</code>.
-    testString: 'assert(Animal.prototype.isPrototypeOf(Dog.prototype), "<code>Dog.prototype</code> should be an instance of <code>Animal</code>.");'
+    testString: assert(Animal.prototype.isPrototypeOf(Dog.prototype), '<code>Dog.prototype</code> should be an instance of <code>Animal</code>.');
   - text: <code>beagle.constructor</code> should return <code>Dog</code>.
-    testString: 'assert(beagle.constructor === Dog, "<code>beagle.constructor</code> should return <code>Dog</code>.");'
+    testString: assert(beagle.constructor === Dog, '<code>beagle.constructor</code> should return <code>Dog</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/set-the-childs-prototype-to-an-instance-of-the-parent.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/set-the-childs-prototype-to-an-instance-of-the-parent.english.md
index f204ab0bf0..16989853cb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/set-the-childs-prototype-to-an-instance-of-the-parent.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/set-the-childs-prototype-to-an-instance-of-the-parent.english.md
@@ -25,7 +25,7 @@ Modify the code so that instances of <code>Dog</code> inherit from <code>Animal<
 ```yml
 tests:
   - text: <code>Dog.prototype</code> should be an instance of <code>Animal</code>.
-    testString: 'assert(Animal.prototype.isPrototypeOf(Dog.prototype), "<code>Dog.prototype</code> should be an instance of <code>Animal</code>.");'
+    testString: assert(Animal.prototype.isPrototypeOf(Dog.prototype), '<code>Dog.prototype</code> should be an instance of <code>Animal</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-own-properties.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-own-properties.english.md
index 7f61df660a..9bb5134dac 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-own-properties.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-own-properties.english.md
@@ -25,9 +25,9 @@ Add the <code>own</code> properties of <code>canary</code> to the array <code>ow
 ```yml
 tests:
   - text: <code>ownProps</code> should include the values <code>"numLegs"</code> and <code>"name"</code>.
-    testString: 'assert(ownProps.indexOf("name") !== -1 && ownProps.indexOf("numLegs") !== -1, "<code>ownProps</code> should include the values <code>"numLegs"</code> and <code>"name"</code>.");'
+    testString: assert(ownProps.indexOf('name') !== -1 && ownProps.indexOf('numLegs') !== -1, '<code>ownProps</code> should include the values <code>"numLegs"</code> and <code>"name"</code>.');
   - text: Solve this challenge without using the built in method <code>Object.keys()</code>.
-    testString: 'assert(!/\Object.keys/.test(code), "Solve this challenge without using the built in method <code>Object.keys()</code>.");'
+    testString: assert(!/\Object.keys/.test(code), 'Solve this challenge without using the built in method <code>Object.keys()</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-constructor-property.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-constructor-property.english.md
index 398bcd3001..fc37ca86f1 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-constructor-property.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-constructor-property.english.md
@@ -25,11 +25,11 @@ Write a <code>joinDogFraternity</code> function that takes a <code>candidate</co
 ```yml
 tests:
   - text: <code>joinDogFraternity</code> should be defined as a function.
-    testString: 'assert(typeof(joinDogFraternity) === "function", "<code>joinDogFraternity</code> should be defined as a function.");'
+    testString: assert(typeof(joinDogFraternity) === 'function', '<code>joinDogFraternity</code> should be defined as a function.');
   - text: <code>joinDogFraternity</code> should return true if<code>candidate</code> is an instance of <code>Dog</code>.
-    testString: 'assert(joinDogFraternity(new Dog("")) === true, "<code>joinDogFraternity</code> should return true if<code>candidate</code> is an instance of <code>Dog</code>.");'
+    testString: assert(joinDogFraternity(new Dog("")) === true, '<code>joinDogFraternity</code> should return true if<code>candidate</code> is an instance of <code>Dog</code>.');
   - text: <code>joinDogFraternity</code> should use the <code>constructor</code> property.
-    testString: 'assert(/\.constructor/.test(code) && !/instanceof/.test(code), "<code>joinDogFraternity</code> should use the <code>constructor</code> property.");'
+    testString: assert(/\.constructor/.test(code) && !/instanceof/.test(code), '<code>joinDogFraternity</code> should use the <code>constructor</code> property.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-immediately-invoked-function-expression-iife.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-immediately-invoked-function-expression-iife.english.md
index dcde8868ac..53d3ba7b0a 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-immediately-invoked-function-expression-iife.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-immediately-invoked-function-expression-iife.english.md
@@ -22,9 +22,9 @@ Rewrite the function <code>makeNest</code> and remove its call so instead it's a
 ```yml
 tests:
   - text: The function should be anonymous.
-    testString: 'assert(/\(\s*?function\s*?\(\s*?\)\s*?{/.test(code), "The function should be anonymous.");'
+    testString: assert(/\(\s*?function\s*?\(\s*?\)\s*?{/.test(code), 'The function should be anonymous.');
   - text: Your function should have parentheses at the end of the expression to call it immediately.
-    testString: 'assert(/}\s*?\)\s*?\(\s*?\)/.test(code), "Your function should have parentheses at the end of the expression to call it immediately.");'
+    testString: assert(/}\s*?\)\s*?\(\s*?\)/.test(code), 'Your function should have parentheses at the end of the expression to call it immediately.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-prototype-chain.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-prototype-chain.english.md
index 9ad16a83dc..7e097cfe94 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-prototype-chain.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-the-prototype-chain.english.md
@@ -28,7 +28,7 @@ Modify the code to show the correct prototype chain.
 ```yml
 tests:
   - text: Your code should show that <code>Object.prototype</code> is the prototype of <code>Dog.prototype</code>")
-    testString: 'assert(/Object\.prototype\.isPrototypeOf/.test(code), "Your code should show that <code>Object.prototype</code> is the prototype of <code>Dog.prototype</code>");'
+    testString: assert(/Object\.prototype\.isPrototypeOf/.test(code), "Your code should show that <code>Object.prototype</code> is the prototype of <code>Dog.prototype</code>");
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-where-an-objects-prototype-comes-from.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-where-an-objects-prototype-comes-from.english.md
index 1b28f46da7..85ce0fdb4e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-where-an-objects-prototype-comes-from.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-where-an-objects-prototype-comes-from.english.md
@@ -23,7 +23,7 @@ Use <code>isPrototypeOf</code> to check the <code>prototype</code> of <code>beag
 ```yml
 tests:
   - text: Show that <code>Dog.prototype</code> is the <code>prototype</code> of <code>beagle</code>
-    testString: 'assert(/Dog\.prototype\.isPrototypeOf\(beagle\)/.test(code), "Show that <code>Dog.prototype</code> is the <code>prototype</code> of <code>beagle</code>");'
+    testString: assert(/Dog\.prototype\.isPrototypeOf\(beagle\)/.test(code), 'Show that <code>Dog.prototype</code> is the <code>prototype</code> of <code>beagle</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-constructor-to-create-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-constructor-to-create-objects.english.md
index 95629a9f3a..03aa3c18b4 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-constructor-to-create-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-constructor-to-create-objects.english.md
@@ -26,9 +26,9 @@ Use the <code>Dog</code> constructor from the last lesson to create a new instan
 ```yml
 tests:
   - text: <code>hound</code> should be created using the <code>Dog</code> constructor.
-    testString: 'assert(hound instanceof Dog, "<code>hound</code> should be created using the <code>Dog</code> constructor.");'
+    testString: assert(hound instanceof Dog, '<code>hound</code> should be created using the <code>Dog</code> constructor.');
   - text: Your code should use the <code>new</code> operator to create an <code>instance</code> of <code>Dog</code>.
-    testString: 'assert(code.match(/new/g), "Your code should use the <code>new</code> operator to create an <code>instance</code> of <code>Dog</code>.");'
+    testString: assert(code.match(/new/g), 'Your code should use the <code>new</code> operator to create an <code>instance</code> of <code>Dog</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-mixin-to-add-common-behavior-between-unrelated-objects.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-mixin-to-add-common-behavior-between-unrelated-objects.english.md
index 6bb30bc780..ec5a3e0ce7 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-mixin-to-add-common-behavior-between-unrelated-objects.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-a-mixin-to-add-common-behavior-between-unrelated-objects.english.md
@@ -27,11 +27,11 @@ Create a <code>mixin</code> named <code>glideMixin</code> that defines a method
 ```yml
 tests:
   - text: Your code should declare a <code>glideMixin</code> variable that is a function.
-    testString: 'assert(typeof glideMixin === "function", "Your code should declare a <code>glideMixin</code> variable that is a function.");'
+    testString: assert(typeof glideMixin === "function", 'Your code should declare a <code>glideMixin</code> variable that is a function.');
   - text: Your code should use the <code>glideMixin</code> on the <code>bird</code> object to give it the <code>glide</code> method.
-    testString: 'assert(typeof bird.glide === "function", "Your code should use the <code>glideMixin</code> on the <code>bird</code> object to give it the <code>glide</code> method.");'
+    testString: assert(typeof bird.glide === "function", 'Your code should use the <code>glideMixin</code> on the <code>bird</code> object to give it the <code>glide</code> method.');
   - text: Your code should use the <code>glideMixin</code> on the <code>boat</code> object to give it the <code>glide</code> method.
-    testString: 'assert(typeof boat.glide === "function", "Your code should use the <code>glideMixin</code> on the <code>boat</code> object to give it the <code>glide</code> method.");'
+    testString: assert(typeof boat.glide === "function", 'Your code should use the <code>glideMixin</code> on the <code>boat</code> object to give it the <code>glide</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-an-iife-to-create-a-module.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-an-iife-to-create-a-module.english.md
index f399676178..ce6eb1af70 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-an-iife-to-create-a-module.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-an-iife-to-create-a-module.english.md
@@ -26,11 +26,11 @@ Create a <code>module</code> named <code>funModule</code> to wrap the two <code>
 ```yml
 tests:
   - text: <code>funModule</code> should be defined and return an object.
-    testString: 'assert(typeof funModule === "object", "<code>funModule</code> should be defined and return an object.");'
+    testString: assert(typeof funModule === "object", '<code>funModule</code> should be defined and return an object.');
   - text: <code>funModule.isCuteMixin</code> should access a function.
-    testString: 'assert(typeof funModule.isCuteMixin === "function", "<code>funModule.isCuteMixin</code> should access a function.");'
+    testString: assert(typeof funModule.isCuteMixin === "function", '<code>funModule.isCuteMixin</code> should access a function.');
   - text: <code>funModule.singMixin</code> should access a function.
-    testString: 'assert(typeof funModule.singMixin === "function", "<code>funModule.singMixin</code> should access a function.");'
+    testString: assert(typeof funModule.singMixin === "function", '<code>funModule.singMixin</code> should access a function.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-closure-to-protect-properties-within-an-object-from-being-modified-externally.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-closure-to-protect-properties-within-an-object-from-being-modified-externally.english.md
index 0495510179..87bbb518e0 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-closure-to-protect-properties-within-an-object-from-being-modified-externally.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-closure-to-protect-properties-within-an-object-from-being-modified-externally.english.md
@@ -25,9 +25,9 @@ Change how <code>weight</code> is declared in the <code>Bird</code> function so
 ```yml
 tests:
   - text: The <code>weight</code> property should be a private variable.
-    testString: 'assert(!code.match(/this\.weight/g), "The <code>weight</code> property should be a private variable.");'
+    testString: assert(!code.match(/this\.weight/g), 'The <code>weight</code> property should be a private variable.');
   - text: Your code should create a method in <code>Bird</code> called <code>getWeight</code> that returns the <code>weight</code>.
-    testString: 'assert((new Bird()).getWeight() === 15, "Your code should create a method in <code>Bird</code> called <code>getWeight</code> that returns the <code>weight</code>.");'
+    testString: assert((new Bird()).getWeight() === 15, 'Your code should create a method in <code>Bird</code> called <code>getWeight</code> that returns the <code>weight</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-dot-notation-to-access-the-properties-of-an-object.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-dot-notation-to-access-the-properties-of-an-object.english.md
index 703644a41e..e6f4d38824 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-dot-notation-to-access-the-properties-of-an-object.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-dot-notation-to-access-the-properties-of-an-object.english.md
@@ -22,9 +22,9 @@ Print both <code>properties</code> of the <code>dog</code> object below to your
 ```yml
 tests:
   - text: Your should use <code>console.log</code> to print the value for the <code>name</code> property of the <code>dog</code> object.
-    testString: 'assert(/console.log\(.*dog\.name.*\)/g.test(code), "Your should use <code>console.log</code> to print the value for the <code>name</code> property of the <code>dog</code> object.");'
+    testString: assert(/console.log\(.*dog\.name.*\)/g.test(code), 'Your should use <code>console.log</code> to print the value for the <code>name</code> property of the <code>dog</code> object.');
   - text: Your should use <code>console.log</code> to print the value for the <code>numLegs</code> property of the <code>dog</code> object.
-    testString: 'assert(/console.log\(.*dog\.numLegs.*\)/g.test(code), "Your should use <code>console.log</code> to print the value for the <code>numLegs</code> property of the <code>dog</code> object.");'
+    testString: assert(/console.log\(.*dog\.numLegs.*\)/g.test(code), 'Your should use <code>console.log</code> to print the value for the <code>numLegs</code> property of the <code>dog</code> object.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-inheritance-so-you-dont-repeat-yourself.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-inheritance-so-you-dont-repeat-yourself.english.md
index dff2720408..de881d02b3 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-inheritance-so-you-dont-repeat-yourself.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-inheritance-so-you-dont-repeat-yourself.english.md
@@ -26,11 +26,11 @@ The <code>eat</code> method is repeated in both <code>Cat</code> and <code>Bear<
 ```yml
 tests:
   - text: <code>Animal.prototype</code> should have the <code>eat</code> property.
-    testString: 'assert(Animal.prototype.hasOwnProperty("eat"), "<code>Animal.prototype</code> should have the <code>eat</code> property.");'
+    testString: assert(Animal.prototype.hasOwnProperty('eat'), '<code>Animal.prototype</code> should have the <code>eat</code> property.');
   - text: <code>Bear.prototype</code> should not have the <code>eat</code> property.
-    testString: 'assert(!(Bear.prototype.hasOwnProperty("eat")), "<code>Bear.prototype</code> should not have the <code>eat</code> property.");'
+    testString: assert(!(Bear.prototype.hasOwnProperty('eat')), '<code>Bear.prototype</code> should not have the <code>eat</code> property.');
   - text: <code>Cat.prototype</code> should not have the <code>eat</code> property.
-    testString: 'assert(!(Cat.prototype.hasOwnProperty("eat")), "<code>Cat.prototype</code> should not have the <code>eat</code> property.");'
+    testString: assert(!(Cat.prototype.hasOwnProperty('eat')), '<code>Cat.prototype</code> should not have the <code>eat</code> property.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-prototype-properties-to-reduce-duplicate-code.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-prototype-properties-to-reduce-duplicate-code.english.md
index b3cc176754..0e864e6abe 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-prototype-properties-to-reduce-duplicate-code.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/use-prototype-properties-to-reduce-duplicate-code.english.md
@@ -27,11 +27,11 @@ Add a <code>numLegs</code> property to the <code>prototype</code> of <code>Dog</
 ```yml
 tests:
   - text: <code>beagle</code> should have a <code>numLegs</code> property.
-    testString: 'assert(beagle.numLegs !== undefined, "<code>beagle</code> should have a <code>numLegs</code> property.");'
+    testString: assert(beagle.numLegs !== undefined, '<code>beagle</code> should have a <code>numLegs</code> property.');
   - text: <code>beagle.numLegs</code> should be a number.
-    testString: 'assert(typeof(beagle.numLegs) === "number" , "<code>beagle.numLegs</code> should be a number.");'
+    testString: assert(typeof(beagle.numLegs) === 'number' , '<code>beagle.numLegs</code> should be a number.');
   - text: <code>numLegs</code> should be a <code>prototype</code> property not an <code>own</code> property.
-    testString: 'assert(beagle.hasOwnProperty("numLegs") === false, "<code>numLegs</code> should be a <code>prototype</code> property not an <code>own</code> property.");'
+    testString: assert(beagle.hasOwnProperty('numLegs') === false, '<code>numLegs</code> should be a <code>prototype</code> property not an <code>own</code> property.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/verify-an-objects-constructor-with-instanceof.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/verify-an-objects-constructor-with-instanceof.english.md
index cde4e1aade..6cb6ea734f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/verify-an-objects-constructor-with-instanceof.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/verify-an-objects-constructor-with-instanceof.english.md
@@ -23,9 +23,9 @@ Create a new instance of the <code>House</code> constructor, calling it <code>my
 ```yml
 tests:
   - text: <code>myHouse</code> should have a <code>numBedrooms</code> attribute set to a number.
-    testString: 'assert(typeof myHouse.numBedrooms === "number", "<code>myHouse</code> should have a <code>numBedrooms</code> attribute set to a number.");'
+    testString: assert(typeof myHouse.numBedrooms === 'number', '<code>myHouse</code> should have a <code>numBedrooms</code> attribute set to a number.');
   - text: Be sure to verify that <code>myHouse</code> is an instance of <code>House</code> using the <code>instanceof</code> operator.
-    testString: 'assert(/myHouse\s*instanceof\s*House/.test(code), "Be sure to verify that <code>myHouse</code> is an instance of <code>House</code> using the <code>instanceof</code> operator.");'
+    testString: assert(/myHouse\s*instanceof\s*House/.test(code), 'Be sure to verify that <code>myHouse</code> is an instance of <code>House</code> using the <code>instanceof</code> operator.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/check-for-all-or-none.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/check-for-all-or-none.english.md
index ffdb1cacab..01e404e09e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/check-for-all-or-none.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/check-for-all-or-none.english.md
@@ -22,14 +22,14 @@ Change the regex <code>favRegex</code> to match both the American English (favor
 
 ```yml
 tests:
-  - text: 'Your regex should use the optional symbol, <code>?</code>.'
-    testString: 'assert(favRegex.source.match(/\?/).length > 0, "Your regex should use the optional symbol, <code>?</code>.");'
+  - text: Your regex should use the optional symbol, <code>?</code>.
+    testString: assert(favRegex.source.match(/\?/).length > 0, 'Your regex should use the optional symbol, <code>?</code>.');
   - text: Your regex should match <code>"favorite"</code>
-    testString: 'assert(favRegex.test("favorite"), "Your regex should match <code>"favorite"</code>");'
+    testString: assert(favRegex.test("favorite"), 'Your regex should match <code>"favorite"</code>');
   - text: Your regex should match <code>"favourite"</code>
-    testString: 'assert(favRegex.test("favourite"), "Your regex should match <code>"favourite"</code>");'
+    testString: assert(favRegex.test("favourite"), 'Your regex should match <code>"favourite"</code>');
   - text: Your regex should not match <code>"fav"</code>
-    testString: 'assert(!favRegex.test("fav"), "Your regex should not match <code>"fav"</code>");'
+    testString: assert(!favRegex.test("fav"), 'Your regex should not match <code>"fav"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/extract-matches.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/extract-matches.english.md
index bfcedb58da..2b2855dd12 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/extract-matches.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/extract-matches.english.md
@@ -22,11 +22,11 @@ Apply the <code>.match()</code> method to extract the word <code>coding</code>.
 ```yml
 tests:
   - text: The <code>result</code> should have the word <code>coding</code>
-    testString: 'assert(result.join() === "coding", "The <code>result</code> should have the word <code>coding</code>");'
+    testString: assert(result.join() === "coding", 'The <code>result</code> should have the word <code>coding</code>');
   - text: Your regex <code>codingRegex</code> should search for <code>coding</code>
-    testString: 'assert(codingRegex.source === "coding", "Your regex <code>codingRegex</code> should search for <code>coding</code>");'
+    testString: assert(codingRegex.source === "coding", 'Your regex <code>codingRegex</code> should search for <code>coding</code>');
   - text: You should use the <code>.match()</code> method.
-    testString: 'assert(code.match(/\.match\(.*\)/), "You should use the <code>.match()</code> method.");'
+    testString: assert(code.match(/\.match\(.*\)/), 'You should use the <code>.match()</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-characters-with-lazy-matching.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-characters-with-lazy-matching.english.md
index f9aa0ce1f6..78d8b8c149 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-characters-with-lazy-matching.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-characters-with-lazy-matching.english.md
@@ -23,7 +23,7 @@ Fix the regex <code>/&lt;.*&gt;/</code> to return the HTML tag <code>&lt;h1&gt;<
 ```yml
 tests:
   - text: The <code>result</code> variable should be an array with <code>&lt;h1&gt;</code> in it
-    testString: 'assert(result[0] == "<h1>", "The <code>result</code> variable should be an array with <code>&lt;h1&gt;</code> in it");'
+    testString: assert(result[0] == '<h1>', 'The <code>result</code> variable should be an array with <code>&lt;h1&gt;</code> in it');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-more-than-the-first-match.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-more-than-the-first-match.english.md
index f847da0e58..7cd9d22b51 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-more-than-the-first-match.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-more-than-the-first-match.english.md
@@ -24,13 +24,13 @@ Using the regex <code>starRegex</code>, find and extract both <code>"Twinkle"</c
 ```yml
 tests:
   - text: Your regex <code>starRegex</code> should use the global flag <code>g</code>
-    testString: 'assert(starRegex.flags.match(/g/).length == 1, "Your regex <code>starRegex</code> should use the global flag <code>g</code>");'
+    testString: assert(starRegex.flags.match(/g/).length == 1, 'Your regex <code>starRegex</code> should use the global flag <code>g</code>');
   - text: Your regex <code>starRegex</code> should use the case insensitive flag <code>i</code>
-    testString: 'assert(starRegex.flags.match(/i/).length == 1, "Your regex <code>starRegex</code> should use the case insensitive flag <code>i</code>");'
+    testString: assert(starRegex.flags.match(/i/).length == 1, 'Your regex <code>starRegex</code> should use the case insensitive flag <code>i</code>');
   - text: Your match should match both occurrences of the word <code>"Twinkle"</code>
-    testString: 'assert(result.sort().join() == twinkleStar.match(/twinkle/gi).sort().join(), "Your match should match both occurrences of the word <code>"Twinkle"</code>");'
+    testString: assert(result.sort().join() == twinkleStar.match(/twinkle/gi).sort().join(), 'Your match should match both occurrences of the word <code>"Twinkle"</code>');
   - text: Your match <code>result</code> should have two elements in it.
-    testString: 'assert(result.length == 2, "Your match <code>result</code> should have two elements in it.");'
+    testString: assert(result.length == 2, 'Your match <code>result</code> should have two elements in it.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-one-or-more-criminals-in-a-hunt.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-one-or-more-criminals-in-a-hunt.english.md
index b962f99022..a1e254c5b8 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-one-or-more-criminals-in-a-hunt.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/find-one-or-more-criminals-in-a-hunt.english.md
@@ -25,19 +25,19 @@ Write a <code>greedy</code> regex that finds one or more criminals within a grou
 ```yml
 tests:
   - text: Your regex should match <code>one</code> criminal ("<code>C</code>") in <code>"C"</code>
-    testString: 'assert("C".match(reCriminals) && "C".match(reCriminals)[0] == "C", "Your regex should match <code>one</code> criminal ("<code>C</code>") in <code>"C"</code>");'
+    testString: assert('C'.match(reCriminals) && 'C'.match(reCriminals)[0] == 'C', 'Your regex should match <code>one</code> criminal ("<code>C</code>") in <code>"C"</code>');
   - text: Your regex should match <code>two</code> criminals ("<code>CC</code>") in <code>"CC"</code>
-    testString: 'assert("CC".match(reCriminals) && "CC".match(reCriminals)[0] == "CC", "Your regex should match <code>two</code> criminals ("<code>CC</code>") in <code>"CC"</code>");'
+    testString: assert('CC'.match(reCriminals) && 'CC'.match(reCriminals)[0] == 'CC', 'Your regex should match <code>two</code> criminals ("<code>CC</code>") in <code>"CC"</code>');
   - text: Your regex should match <code>three</code> criminals ("<code>CCC</code>") in <code>"P1P5P4CCCP2P6P3"</code>
-    testString: 'assert("P1P5P4CCCP2P6P3".match(reCriminals) && "P1P5P4CCCP2P6P3".match(reCriminals)[0] == "CCC", "Your regex should match <code>three</code> criminals ("<code>CCC</code>") in <code>"P1P5P4CCCP2P6P3"</code>");'
+    testString: assert('P1P5P4CCCP2P6P3'.match(reCriminals) && 'P1P5P4CCCP2P6P3'.match(reCriminals)[0] == 'CCC', 'Your regex should match <code>three</code> criminals ("<code>CCC</code>") in <code>"P1P5P4CCCP2P6P3"</code>');
   - text: Your regex should match <code>five</code> criminals ("<code>CCCCC</code>") in <code>"P6P2P7P4P5CCCCCP3P1"</code>
-    testString: 'assert("P6P2P7P4P5CCCCCP3P1".match(reCriminals) && "P6P2P7P4P5CCCCCP3P1".match(reCriminals)[0] == "CCCCC", "Your regex should match <code>five</code> criminals ("<code>CCCCC</code>") in <code>"P6P2P7P4P5CCCCCP3P1"</code>");'
+    testString: assert('P6P2P7P4P5CCCCCP3P1'.match(reCriminals) && 'P6P2P7P4P5CCCCCP3P1'.match(reCriminals)[0] == 'CCCCC', 'Your regex should match <code>five</code> criminals ("<code>CCCCC</code>") in <code>"P6P2P7P4P5CCCCCP3P1"</code>');
   - text: Your regex should not match any criminals in <code>""</code>
-    testString: 'assert(!reCriminals.test(""), "Your regex should not match any criminals in <code>""</code>");'
+    testString: assert(!reCriminals.test(''), 'Your regex should not match any criminals in <code>""</code>');
   - text: Your regex should not match any criminals in <code>"P1P2P3"</code>
-    testString: 'assert(!reCriminals.test("P1P2P3"), "Your regex should not match any criminals in <code>"P1P2P3"</code>");'
+    testString: assert(!reCriminals.test('P1P2P3'), 'Your regex should not match any criminals in <code>"P1P2P3"</code>');
   - text: Your regex should match <code>fifty</code> criminals ("<code>CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC</code>") in <code>"P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3"</code>.
-    testString: 'assert("P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3".match(reCriminals) && "P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3".match(reCriminals)[0] == "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC", "Your regex should match <code>fifty</code> criminals ("<code>CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC</code>") in <code>"P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3"</code>.");'
+    testString: assert('P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3'.match(reCriminals) && 'P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3'.match(reCriminals)[0] == "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC", 'Your regex should match <code>fifty</code> criminals ("<code>CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC</code>") in <code>"P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/ignore-case-while-matching.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/ignore-case-while-matching.english.md
index 3d2e13d9ed..8c9142d123 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/ignore-case-while-matching.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/ignore-case-while-matching.english.md
@@ -22,25 +22,25 @@ Write a regex <code>fccRegex</code> to match <code>"freeCodeCamp"</code>, no mat
 ```yml
 tests:
   - text: Your regex should match <code>freeCodeCamp</code>
-    testString: 'assert(fccRegex.test("freeCodeCamp"), "Your regex should match <code>freeCodeCamp</code>");'
+    testString: assert(fccRegex.test('freeCodeCamp'), 'Your regex should match <code>freeCodeCamp</code>');
   - text: Your regex should match <code>FreeCodeCamp</code>
-    testString: 'assert(fccRegex.test("FreeCodeCamp"), "Your regex should match <code>FreeCodeCamp</code>");'
+    testString: assert(fccRegex.test('FreeCodeCamp'), 'Your regex should match <code>FreeCodeCamp</code>');
   - text: Your regex should match <code>FreecodeCamp</code>
-    testString: 'assert(fccRegex.test("FreecodeCamp"), "Your regex should match <code>FreecodeCamp</code>");'
+    testString: assert(fccRegex.test('FreecodeCamp'), 'Your regex should match <code>FreecodeCamp</code>');
   - text: Your regex should match <code>FreeCodecamp</code>
-    testString: 'assert(fccRegex.test("FreeCodecamp"), "Your regex should match <code>FreeCodecamp</code>");'
+    testString: assert(fccRegex.test('FreeCodecamp'), 'Your regex should match <code>FreeCodecamp</code>');
   - text: Your regex should not match <code>Free Code Camp</code>
-    testString: 'assert(!fccRegex.test("Free Code Camp"), "Your regex should not match <code>Free Code Camp</code>");'
+    testString: assert(!fccRegex.test('Free Code Camp'), 'Your regex should not match <code>Free Code Camp</code>');
   - text: Your regex should match <code>FreeCOdeCamp</code>
-    testString: 'assert(fccRegex.test("FreeCOdeCamp"), "Your regex should match <code>FreeCOdeCamp</code>");'
+    testString: assert(fccRegex.test('FreeCOdeCamp'), 'Your regex should match <code>FreeCOdeCamp</code>');
   - text: Your regex should not match <code>FCC</code>
-    testString: 'assert(!fccRegex.test("FCC"), "Your regex should not match <code>FCC</code>");'
+    testString: assert(!fccRegex.test('FCC'), 'Your regex should not match <code>FCC</code>');
   - text: Your regex should match <code>FrEeCoDeCamp</code>
-    testString: 'assert(fccRegex.test("FrEeCoDeCamp"), "Your regex should match <code>FrEeCoDeCamp</code>");'
+    testString: assert(fccRegex.test('FrEeCoDeCamp'), 'Your regex should match <code>FrEeCoDeCamp</code>');
   - text: Your regex should match <code>FrEeCodECamp</code>
-    testString: 'assert(fccRegex.test("FrEeCodECamp"), "Your regex should match <code>FrEeCodECamp</code>");'
+    testString: assert(fccRegex.test('FrEeCodECamp'), 'Your regex should match <code>FrEeCodECamp</code>');
   - text: Your regex should match <code>FReeCodeCAmp</code>
-    testString: 'assert(fccRegex.test("FReeCodeCAmp"), "Your regex should match <code>FReeCodeCAmp</code>");'
+    testString: assert(fccRegex.test('FReeCodeCAmp'), 'Your regex should match <code>FReeCodeCAmp</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-a-literal-string-with-different-possibilities.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-a-literal-string-with-different-possibilities.english.md
index ee2a798e72..e3c8469315 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-a-literal-string-with-different-possibilities.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-a-literal-string-with-different-possibilities.english.md
@@ -23,19 +23,19 @@ Complete the regex <code>petRegex</code> to match the pets <code>"dog"</code>, <
 ```yml
 tests:
   - text: Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"John has a pet dog."</code>
-    testString: 'assert(petRegex.test("John has a pet dog."), "Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"John has a pet dog."</code>");'
+    testString: assert(petRegex.test('John has a pet dog.'), 'Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"John has a pet dog."</code>');
   - text: Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Emma has a pet rock."</code>
-    testString: 'assert(!petRegex.test("Emma has a pet rock."), "Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Emma has a pet rock."</code>");'
+    testString: assert(!petRegex.test('Emma has a pet rock.'), 'Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Emma has a pet rock."</code>');
   - text: Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Emma has a pet bird."</code>
-    testString: 'assert(petRegex.test("Emma has a pet bird."), "Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Emma has a pet bird."</code>");'
+    testString: assert(petRegex.test('Emma has a pet bird.'), 'Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Emma has a pet bird."</code>');
   - text: Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Liz has a pet cat."</code>
-    testString: 'assert(petRegex.test("Liz has a pet cat."), "Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Liz has a pet cat."</code>");'
+    testString: assert(petRegex.test('Liz has a pet cat.'), 'Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Liz has a pet cat."</code>');
   - text: Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Kara has a pet dolphin."</code>
-    testString: 'assert(!petRegex.test("Kara has a pet dolphin."), "Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Kara has a pet dolphin."</code>");'
+    testString: assert(!petRegex.test('Kara has a pet dolphin.'), 'Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Kara has a pet dolphin."</code>');
   - text: Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Alice has a pet fish."</code>
-    testString: 'assert(petRegex.test("Alice has a pet fish."), "Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Alice has a pet fish."</code>");'
+    testString: assert(petRegex.test('Alice has a pet fish.'), 'Your regex <code>petRegex</code> should return <code>true</code> for the string <code>"Alice has a pet fish."</code>');
   - text: Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Jimmy has a pet computer."</code>
-    testString: 'assert(!petRegex.test("Jimmy has a pet computer."), "Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Jimmy has a pet computer."</code>");'
+    testString: assert(!petRegex.test('Jimmy has a pet computer.'), 'Your regex <code>petRegex</code> should return <code>false</code> for the string <code>"Jimmy has a pet computer."</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-letters-and-numbers.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-letters-and-numbers.english.md
index 59ea8c5cfe..693bc92ca6 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-letters-and-numbers.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-letters-and-numbers.english.md
@@ -23,17 +23,17 @@ Use the shorthand character class <code>\w</code> to count the number of alphanu
 ```yml
 tests:
   - text: Your regex should use the global flag.
-    testString: 'assert(alphabetRegexV2.global, "Your regex should use the global flag.");'
+    testString: assert(alphabetRegexV2.global, 'Your regex should use the global flag.');
   - text: Your regex should use the shorthand character
-    testString: 'assert(/\\w/.test(alphabetRegexV2.source), "Your regex should use the shorthand character <code>\w</code> to match all characters which are alphanumeric.");'
+    testString: assert(/\\w/.test(alphabetRegexV2.source), 'Your regex should use the shorthand character <code>\w</code> to match all characters which are alphanumeric.');
   - text: Your regex should find 31 alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>
-    testString: 'assert("The five boxing wizards jump quickly.".match(alphabetRegexV2).length === 31, "Your regex should find 31 alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>");'
+    testString: assert("The five boxing wizards jump quickly.".match(alphabetRegexV2).length === 31, 'Your regex should find 31 alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>');
   - text: Your regex should find 32 alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>
-    testString: 'assert("Pack my box with five dozen liquor jugs.".match(alphabetRegexV2).length === 32, "Your regex should find 32 alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>");'
+    testString: assert("Pack my box with five dozen liquor jugs.".match(alphabetRegexV2).length === 32, 'Your regex should find 32 alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>');
   - text: Your regex should find 30 alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>
-    testString: 'assert("How vexingly quick daft zebras jump!".match(alphabetRegexV2).length === 30, "Your regex should find 30 alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>");'
+    testString: assert("How vexingly quick daft zebras jump!".match(alphabetRegexV2).length === 30, 'Your regex should find 30 alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>');
   - text: Your regex should find 36 alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>
-    testString: 'assert("123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.".match(alphabetRegexV2).length === 36, "Your regex should find 36 alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>");'
+    testString: assert("123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.".match(alphabetRegexV2).length === 36, 'Your regex should find 36 alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-non-numbers.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-non-numbers.english.md
index ea9f0c4c66..07442e30f8 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-non-numbers.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-non-numbers.english.md
@@ -21,21 +21,21 @@ Use the shorthand character class for non-digits <code>\D</code> to count how ma
 ```yml
 tests:
   - text: Your regex should use the shortcut character to match non-digit characters
-    testString: 'assert(/\\D/.test(noNumRegex.source), "Your regex should use the shortcut character to match non-digit characters");'
+    testString: assert(/\\D/.test(noNumRegex.source), 'Your regex should use the shortcut character to match non-digit characters');
   - text: Your regex should use the global flag.
-    testString: 'assert(noNumRegex.global, "Your regex should use the global flag.");'
+    testString: assert(noNumRegex.global, 'Your regex should use the global flag.');
   - text: Your regex should find no non-digits in <code>"9"</code>.
-    testString: 'assert("9".match(noNumRegex) == null, "Your regex should find no non-digits in <code>"9"</code>.");'
+    testString: assert("9".match(noNumRegex) == null, 'Your regex should find no non-digits in <code>"9"</code>.');
   - text: Your regex should find 6 non-digits in <code>"Catch 22"</code>.
-    testString: 'assert("Catch 22".match(noNumRegex).length == 6, "Your regex should find 6 non-digits in <code>"Catch 22"</code>.");'
+    testString: assert("Catch 22".match(noNumRegex).length == 6, 'Your regex should find 6 non-digits in <code>"Catch 22"</code>.');
   - text: Your regex should find 11 non-digits in <code>"101 Dalmatians"</code>.
-    testString: 'assert("101 Dalmatians".match(noNumRegex).length == 11, "Your regex should find 11 non-digits in <code>"101 Dalmatians"</code>.");'
-  - text: 'Your regex should find 15 non-digits in <code>"One, Two, Three"</code>.'
-    testString: 'assert("One, Two, Three".match(noNumRegex).length == 15, "Your regex should find 15 non-digits in <code>"One, Two, Three"</code>.");'
+    testString: assert("101 Dalmatians".match(noNumRegex).length == 11, 'Your regex should find 11 non-digits in <code>"101 Dalmatians"</code>.');
+  - text: Your regex should find 15 non-digits in <code>"One, Two, Three"</code>.
+    testString: assert("One, Two, Three".match(noNumRegex).length == 15, 'Your regex should find 15 non-digits in <code>"One, Two, Three"</code>.');
   - text: Your regex should find 12 non-digits in <code>"21 Jump Street"</code>.
-    testString: 'assert("21 Jump Street".match(noNumRegex).length == 12, "Your regex should find 12 non-digits in <code>"21 Jump Street"</code>.");'
+    testString: assert("21 Jump Street".match(noNumRegex).length == 12, 'Your regex should find 12 non-digits in <code>"21 Jump Street"</code>.');
   - text: 'Your regex should find 17 non-digits in <code>"2001: A Space Odyssey"</code>.'
-    testString: 'assert("2001: A Space Odyssey".match(noNumRegex).length == 17, "Your regex should find 17 non-digits in <code>"2001: A Space Odyssey"</code>.");'
+    testString: 'assert("2001: A Space Odyssey".match(noNumRegex).length == 17, ''Your regex should find 17 non-digits in <code>"2001: A Space Odyssey"</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-numbers.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-numbers.english.md
index 8673eed649..cc3d54e64c 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-numbers.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-all-numbers.english.md
@@ -21,21 +21,21 @@ Use the shorthand character class <code>\d</code> to count how many digits are i
 ```yml
 tests:
   - text: Your regex should use the shortcut character to match digit characters
-    testString: 'assert(/\\d/.test(numRegex.source), "Your regex should use the shortcut character to match digit characters");'
+    testString: assert(/\\d/.test(numRegex.source), 'Your regex should use the shortcut character to match digit characters');
   - text: Your regex should use the global flag.
-    testString: 'assert(numRegex.global, "Your regex should use the global flag.");'
+    testString: assert(numRegex.global, 'Your regex should use the global flag.');
   - text: Your regex should find 1 digit in <code>"9"</code>.
-    testString: 'assert("9".match(numRegex).length == 1, "Your regex should find 1 digit in <code>"9"</code>.");'
+    testString: assert("9".match(numRegex).length == 1, 'Your regex should find 1 digit in <code>"9"</code>.');
   - text: Your regex should find 2 digits in <code>"Catch 22"</code>.
-    testString: 'assert("Catch 22".match(numRegex).length == 2, "Your regex should find 2 digits in <code>"Catch 22"</code>.");'
+    testString: assert("Catch 22".match(numRegex).length == 2, 'Your regex should find 2 digits in <code>"Catch 22"</code>.');
   - text: Your regex should find 3 digits in <code>"101 Dalmatians"</code>.
-    testString: 'assert("101 Dalmatians".match(numRegex).length == 3, "Your regex should find 3 digits in <code>"101 Dalmatians"</code>.");'
-  - text: 'Your regex should find no digits in <code>"One, Two, Three"</code>.'
-    testString: 'assert("One, Two, Three".match(numRegex) == null, "Your regex should find no digits in <code>"One, Two, Three"</code>.");'
+    testString: assert("101 Dalmatians".match(numRegex).length == 3, 'Your regex should find 3 digits in <code>"101 Dalmatians"</code>.');
+  - text: Your regex should find no digits in <code>"One, Two, Three"</code>.
+    testString: assert("One, Two, Three".match(numRegex) == null, 'Your regex should find no digits in <code>"One, Two, Three"</code>.');
   - text: Your regex should find 2 digits in <code>"21 Jump Street"</code>.
-    testString: 'assert("21 Jump Street".match(numRegex).length == 2, "Your regex should find 2 digits in <code>"21 Jump Street"</code>.");'
+    testString: assert("21 Jump Street".match(numRegex).length == 2, 'Your regex should find 2 digits in <code>"21 Jump Street"</code>.');
   - text: 'Your regex should find 4 digits in <code>"2001: A Space Odyssey"</code>.'
-    testString: 'assert("2001: A Space Odyssey".match(numRegex).length == 4, "Your regex should find 4 digits in <code>"2001: A Space Odyssey"</code>.");'
+    testString: 'assert("2001: A Space Odyssey".match(numRegex).length == 4, ''Your regex should find 4 digits in <code>"2001: A Space Odyssey"</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-anything-with-wildcard-period.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-anything-with-wildcard-period.english.md
index 4954eb1a22..06ef8a8d7e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-anything-with-wildcard-period.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-anything-with-wildcard-period.english.md
@@ -22,25 +22,25 @@ Complete the regex <code>unRegex</code> so that it matches the strings <code>"ru
 ```yml
 tests:
   - text: You should use the <code>.test()</code> method.
-    testString: 'assert(code.match(/\.test\(.*\)/), "You should use the <code>.test()</code> method.");'
+    testString: assert(code.match(/\.test\(.*\)/), 'You should use the <code>.test()</code> method.');
   - text: You should use the wildcard character in your regex <code>unRegex</code>
-    testString: 'assert(/\./.test(unRegex.source), "You should use the wildcard character in your regex <code>unRegex</code>");'
+    testString: assert(/\./.test(unRegex.source), 'You should use the wildcard character in your regex <code>unRegex</code>');
   - text: Your regex <code>unRegex</code> should match <code>"run"</code> in <code>"Let us go on a run."</code>
-    testString: 'assert(unRegex.test("Let us go on a run."), "Your regex <code>unRegex</code> should match <code>"run"</code> in <code>"Let us go on a run."</code>");'
+    testString: assert(unRegex.test("Let us go on a run."), 'Your regex <code>unRegex</code> should match <code>"run"</code> in <code>"Let us go on a run."</code>');
   - text: Your regex <code>unRegex</code> should match <code>"sun"</code> in <code>"The sun is out today."</code>
-    testString: 'assert(unRegex.test("The sun is out today."), "Your regex <code>unRegex</code> should match <code>"sun"</code> in <code>"The sun is out today."</code>");'
+    testString: assert(unRegex.test("The sun is out today."), 'Your regex <code>unRegex</code> should match <code>"sun"</code> in <code>"The sun is out today."</code>');
   - text: Your regex <code>unRegex</code> should match <code>"fun"</code> in <code>"Coding is a lot of fun."</code>
-    testString: 'assert(unRegex.test("Coding is a lot of fun."), "Your regex <code>unRegex</code> should match <code>"fun"</code> in <code>"Coding is a lot of fun."</code>");'
+    testString: assert(unRegex.test("Coding is a lot of fun."), 'Your regex <code>unRegex</code> should match <code>"fun"</code> in <code>"Coding is a lot of fun."</code>');
   - text: Your regex <code>unRegex</code> should match <code>"pun"</code> in <code>"Seven days without a pun makes one weak."</code>
-    testString: 'assert(unRegex.test("Seven days without a pun makes one weak."), "Your regex <code>unRegex</code> should match <code>"pun"</code> in <code>"Seven days without a pun makes one weak."</code>");'
+    testString: assert(unRegex.test("Seven days without a pun makes one weak."), 'Your regex <code>unRegex</code> should match <code>"pun"</code> in <code>"Seven days without a pun makes one weak."</code>');
   - text: Your regex <code>unRegex</code> should match <code>"nun"</code> in <code>"One takes a vow to be a nun."</code>
-    testString: 'assert(unRegex.test("One takes a vow to be a nun."), "Your regex <code>unRegex</code> should match <code>"nun"</code> in <code>"One takes a vow to be a nun."</code>");'
+    testString: assert(unRegex.test("One takes a vow to be a nun."), 'Your regex <code>unRegex</code> should match <code>"nun"</code> in <code>"One takes a vow to be a nun."</code>');
   - text: Your regex <code>unRegex</code> should match <code>"bun"</code> in <code>"She got fired from the hot dog stand for putting her hair in a bun."</code>
-    testString: 'assert(unRegex.test("She got fired from the hot dog stand for putting her hair in a bun."), "Your regex <code>unRegex</code> should match <code>"bun"</code> in <code>"She got fired from the hot dog stand for putting her hair in a bun."</code>");'
+    testString: assert(unRegex.test("She got fired from the hot dog stand for putting her hair in a bun."), 'Your regex <code>unRegex</code> should match <code>"bun"</code> in <code>"She got fired from the hot dog stand for putting her hair in a bun."</code>');
   - text: Your regex <code>unRegex</code> should not match <code>"There is a bug in my code."</code>
-    testString: 'assert(!unRegex.test("There is a bug in my code."), "Your regex <code>unRegex</code> should not match <code>"There is a bug in my code."</code>");'
+    testString: assert(!unRegex.test("There is a bug in my code."), 'Your regex <code>unRegex</code> should not match <code>"There is a bug in my code."</code>');
   - text: Your regex <code>unRegex</code> should not match <code>"Catch me if you can."</code>
-    testString: 'assert(!unRegex.test("Can me if you can."), "Your regex <code>unRegex</code> should not match <code>"Catch me if you can."</code>");'
+    testString: assert(!unRegex.test("Can me if you can."), 'Your regex <code>unRegex</code> should not match <code>"Catch me if you can."</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-beginning-string-patterns.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-beginning-string-patterns.english.md
index a96bae82cc..7f6d94dddb 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-beginning-string-patterns.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-beginning-string-patterns.english.md
@@ -22,13 +22,13 @@ Use the <code>caret</code> character in a regex to find <code>"Cal"</code> only
 ```yml
 tests:
   - text: Your regex should search for <code>"Cal"</code> with a capital letter.
-    testString: 'assert(calRegex.source == "^Cal", "Your regex should search for <code>"Cal"</code> with a capital letter.");'
+    testString: assert(calRegex.source == "^Cal", 'Your regex should search for <code>"Cal"</code> with a capital letter.');
   - text: Your regex should not use any flags.
-    testString: 'assert(calRegex.flags == "", "Your regex should not use any flags.");'
+    testString: assert(calRegex.flags == "", 'Your regex should not use any flags.');
   - text: Your regex should match <code>"Cal"</code> at the beginning of the string.
-    testString: 'assert(calRegex.test("Cal and Ricky both like racing."), "Your regex should match <code>"Cal"</code> at the beginning of the string.");'
+    testString: assert(calRegex.test("Cal and Ricky both like racing."), 'Your regex should match <code>"Cal"</code> at the beginning of the string.');
   - text: Your regex should not match <code>"Cal"</code> in the middle of a string.
-    testString: 'assert(!calRegex.test("Ricky and Cal both like racing."), "Your regex should not match <code>"Cal"</code> in the middle of a string.");'
+    testString: assert(!calRegex.test("Ricky and Cal both like racing."), 'Your regex should not match <code>"Cal"</code> in the middle of a string.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-one-or-more-times.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-one-or-more-times.english.md
index b7a6193000..dec9e77154 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-one-or-more-times.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-one-or-more-times.english.md
@@ -23,11 +23,11 @@ You want to find matches when the letter <code>s</code> occurs one or more times
 ```yml
 tests:
   - text: Your regex <code>myRegex</code> should use the <code>+</code> sign to match one or more <code>s</code> characters.
-    testString: 'assert(/\+/.test(myRegex.source), "Your regex <code>myRegex</code> should use the <code>+</code> sign to match one or more <code>s</code> characters.");'
+    testString: assert(/\+/.test(myRegex.source), 'Your regex <code>myRegex</code> should use the <code>+</code> sign to match one or more <code>s</code> characters.');
   - text: Your regex <code>myRegex</code> should match 2 items.
-    testString: 'assert(result.length == 2, "Your regex <code>myRegex</code> should match 2 items.");'
+    testString: assert(result.length == 2, 'Your regex <code>myRegex</code> should match 2 items.');
   - text: The <code>result</code> variable should be an array with two matches of <code>"ss"</code>
-    testString: 'assert(result[0] == "ss" && result[1] == "ss", "The <code>result</code> variable should be an array with two matches of <code>"ss"</code>");'
+    testString: assert(result[0] == 'ss' && result[1] == 'ss', 'The <code>result</code> variable should be an array with two matches of <code>"ss"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-zero-or-more-times.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-zero-or-more-times.english.md
index 5d9ab14a2b..210192fedd 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-zero-or-more-times.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-characters-that-occur-zero-or-more-times.english.md
@@ -22,15 +22,15 @@ Create a regex <code>chewieRegex</code> that uses the <code>*</code> character t
 ```yml
 tests:
   - text: Your regex <code>chewieRegex</code> should use the <code>*</code> character to match zero or more <code>a</code> characters.
-    testString: 'assert(/\*/.test(chewieRegex.source), "Your regex <code>chewieRegex</code> should use the <code>*</code> character to match zero or more <code>a</code> characters.");'
+    testString: assert(/\*/.test(chewieRegex.source), 'Your regex <code>chewieRegex</code> should use the <code>*</code> character to match zero or more <code>a</code> characters.');
   - text: Your regex <code>chewieRegex</code> should match 16 characters.
-    testString: 'assert(result[0].length === 16, "Your regex <code>chewieRegex</code> should match 16 characters.");'
+    testString: assert(result[0].length === 16, 'Your regex <code>chewieRegex</code> should match 16 characters.');
   - text: Your regex should match <code>"Aaaaaaaaaaaaaaaa"</code>.
-    testString: 'assert(result[0] === "Aaaaaaaaaaaaaaaa", "Your regex should match <code>"Aaaaaaaaaaaaaaaa"</code>.");'
-  - text: 'Your regex should not match any characters in <code>"He made a fair move. Screaming about it can&#39t help you."</code>'
-    testString: 'assert(!"He made a fair move. Screaming about it can\"t help you.".match(chewieRegex), "Your regex should not match any characters in <code>"He made a fair move. Screaming about it can&#39t help you."</code>");'
-  - text: 'Your regex should not match any characters in <code>"Let him have it. It&#39s not wise to upset a Wookiee."</code>'
-    testString: 'assert(!"Let him have it. It\"s not wise to upset a Wookiee.".match(chewieRegex), "Your regex should not match any characters in <code>"Let him have it. It&#39s not wise to upset a Wookiee."</code>");'
+    testString: assert(result[0] === 'Aaaaaaaaaaaaaaaa', 'Your regex should match <code>"Aaaaaaaaaaaaaaaa"</code>.');
+  - text: Your regex should not match any characters in <code>"He made a fair move. Screaming about it can&#39t help you."</code>
+    testString: assert(!"He made a fair move. Screaming about it can\'t help you.".match(chewieRegex), 'Your regex should not match any characters in <code>"He made a fair move. Screaming about it can&#39t help you."</code>');
+  - text: Your regex should not match any characters in <code>"Let him have it. It&#39s not wise to upset a Wookiee."</code>
+    testString: assert(!"Let him have it. It\'s not wise to upset a Wookiee.".match(chewieRegex), 'Your regex should not match any characters in <code>"Let him have it. It&#39s not wise to upset a Wookiee."</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-ending-string-patterns.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-ending-string-patterns.english.md
index 09fd96e40e..3777c8f18d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-ending-string-patterns.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-ending-string-patterns.english.md
@@ -22,11 +22,11 @@ Use the anchor character (<code>$</code>) to match the string <code>"caboose"</c
 ```yml
 tests:
   - text: You should search for <code>"caboose"</code> with the dollar sign <code>$</code> anchor in your regex.
-    testString: 'assert(lastRegex.source == "caboose$", "You should search for <code>"caboose"</code> with the dollar sign <code>$</code> anchor in your regex.");'
+    testString: assert(lastRegex.source == "caboose$", 'You should search for <code>"caboose"</code> with the dollar sign <code>$</code> anchor in your regex.');
   - text: Your regex should not use any flags.
-    testString: 'assert(lastRegex.flags == "", "Your regex should not use any flags.");'
+    testString: assert(lastRegex.flags == "", 'Your regex should not use any flags.');
   - text: You should match <code>"caboose"</code> at the end of the string <code>"The last car on a train is the caboose"</code>
-    testString: 'assert(lastRegex.test("The last car on a train is the caboose"), "You should match <code>"caboose"</code> at the end of the string <code>"The last car on a train is the caboose"</code>");'
+    testString: assert(lastRegex.test("The last car on a train is the caboose"), 'You should match <code>"caboose"</code> at the end of the string <code>"The last car on a train is the caboose"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-everything-but-letters-and-numbers.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-everything-but-letters-and-numbers.english.md
index 411d56f3a7..cc33bf9ebf 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-everything-but-letters-and-numbers.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-everything-but-letters-and-numbers.english.md
@@ -22,17 +22,17 @@ Use the shorthand character class <code>\W</code> to count the number of non-alp
 ```yml
 tests:
   - text: Your regex should use the global flag.
-    testString: 'assert(nonAlphabetRegex.global, "Your regex should use the global flag.");'
+    testString: assert(nonAlphabetRegex.global, 'Your regex should use the global flag.');
   - text: Your regex should find 6 non-alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>.
-    testString: 'assert("The five boxing wizards jump quickly.".match(nonAlphabetRegex).length == 6, "Your regex should find 6 non-alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>.");'
+    testString: assert("The five boxing wizards jump quickly.".match(nonAlphabetRegex).length == 6, 'Your regex should find 6 non-alphanumeric characters in <code>"The five boxing wizards jump quickly."</code>.');
   - text: Your regex should use the shorthand character.
-    testString: 'assert(/\\W/.test(nonAlphabetRegex.source), "Your regex should use the shorthand character to match characters which are non-alphanumeric.");'
+    testString: assert(/\\W/.test(nonAlphabetRegex.source), 'Your regex should use the shorthand character to match characters which are non-alphanumeric.');
   - text: Your regex should find 8 non-alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>
-    testString: 'assert("Pack my box with five dozen liquor jugs.".match(nonAlphabetRegex).length == 8, "Your regex should find 8 non-alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>");'
+    testString: assert("Pack my box with five dozen liquor jugs.".match(nonAlphabetRegex).length == 8, 'Your regex should find 8 non-alphanumeric characters in <code>"Pack my box with five dozen liquor jugs."</code>');
   - text: Your regex should find 6 non-alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>
-    testString: 'assert("How vexingly quick daft zebras jump!".match(nonAlphabetRegex).length == 6, "Your regex should find 6 non-alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>");'
+    testString: assert("How vexingly quick daft zebras jump!".match(nonAlphabetRegex).length == 6, 'Your regex should find 6 non-alphanumeric characters in <code>"How vexingly quick daft zebras jump!"</code>');
   - text: Your regex should find 12 non-alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>
-    testString: 'assert("123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.".match(nonAlphabetRegex).length == 12, "Your regex should find 12 non-alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>");'
+    testString: assert("123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ.".match(nonAlphabetRegex).length == 12, 'Your regex should find 12 non-alphanumeric characters in <code>"123 456 7890 ABC def GHI jkl MNO pqr STU vwx YZ."</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-letters-of-the-alphabet.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-letters-of-the-alphabet.english.md
index 3e4e887ba6..9ffa44c4f5 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-letters-of-the-alphabet.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-letters-of-the-alphabet.english.md
@@ -24,11 +24,11 @@ Match all the letters in the string <code>quoteSample</code>.
 ```yml
 tests:
   - text: Your regex <code>alphabetRegex</code> should match 35 items.
-    testString: 'assert(result.length == 35, "Your regex <code>alphabetRegex</code> should match 35 items.");'
+    testString: assert(result.length == 35, 'Your regex <code>alphabetRegex</code> should match 35 items.');
   - text: Your regex <code>alphabetRegex</code> should use the global flag.
-    testString: 'assert(alphabetRegex.flags.match(/g/).length == 1, "Your regex <code>alphabetRegex</code> should use the global flag.");'
+    testString: assert(alphabetRegex.flags.match(/g/).length == 1, 'Your regex <code>alphabetRegex</code> should use the global flag.');
   - text: Your regex <code>alphabetRegex</code> should use the case insensitive flag.
-    testString: 'assert(alphabetRegex.flags.match(/i/).length == 1, "Your regex <code>alphabetRegex</code> should use the case insensitive flag.");'
+    testString: assert(alphabetRegex.flags.match(/i/).length == 1, 'Your regex <code>alphabetRegex</code> should use the case insensitive flag.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-literal-strings.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-literal-strings.english.md
index e4aaff7594..15825d7c8b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-literal-strings.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-literal-strings.english.md
@@ -24,11 +24,11 @@ Complete the regex <code>waldoRegex</code> to find <code>"Waldo"</code> in the s
 ```yml
 tests:
   - text: Your regex <code>waldoRegex</code> should find <code>"Waldo"</code>
-    testString: 'assert(waldoRegex.test(waldoIsHiding), "Your regex <code>waldoRegex</code> should find <code>"Waldo"</code>");'
+    testString: assert(waldoRegex.test(waldoIsHiding), 'Your regex <code>waldoRegex</code> should find <code>"Waldo"</code>');
   - text: Your regex <code>waldoRegex</code> should not search for anything else.
-    testString: 'assert(!waldoRegex.test("Somewhere is hiding in this text."), "Your regex <code>waldoRegex</code> should not search for anything else.");'
+    testString: assert(!waldoRegex.test('Somewhere is hiding in this text.'), 'Your regex <code>waldoRegex</code> should not search for anything else.');
   - text: You should perform a literal string match with your regex.
-    testString: 'assert(!/\/.*\/i/.test(code), "You should perform a literal string match with your regex.");'
+    testString: assert(!/\/.*\/i/.test(code), 'You should perform a literal string match with your regex.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-non-whitespace-characters.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-non-whitespace-characters.english.md
index 4cb432546c..13ed0d4342 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-non-whitespace-characters.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-non-whitespace-characters.english.md
@@ -22,15 +22,15 @@ Change the regex <code>countNonWhiteSpace</code> to look for multiple non-whites
 ```yml
 tests:
   - text: Your regex should use the global flag.
-    testString: 'assert(countNonWhiteSpace.global, "Your regex should use the global flag.");'
+    testString: assert(countNonWhiteSpace.global, 'Your regex should use the global flag.');
   - text: Your regex should use the shorthand character
-    testString: 'assert(/\\S/.test(countNonWhiteSpace.source), "Your regex should use the shorthand character <code>\S/code> to match all non-whitespace characters.");'
+    testString: assert(/\\S/.test(countNonWhiteSpace.source), 'Your regex should use the shorthand character <code>\S/code> to match all non-whitespace characters.');
   - text: Your regex should find 35 non-spaces in <code>"Men are from Mars and women are from Venus."</code>
-    testString: 'assert("Men are from Mars and women are from Venus.".match(countNonWhiteSpace).length == 35, "Your regex should find 35 non-spaces in <code>"Men are from Mars and women are from Venus."</code>");'
+    testString: assert("Men are from Mars and women are from Venus.".match(countNonWhiteSpace).length == 35, 'Your regex should find 35 non-spaces in <code>"Men are from Mars and women are from Venus."</code>');
   - text: 'Your regex should find 23 non-spaces in <code>"Space: the final frontier."</code>'
-    testString: 'assert("Space: the final frontier.".match(countNonWhiteSpace).length == 23, "Your regex should find 23 non-spaces in <code>"Space: the final frontier."</code>");'
+    testString: 'assert("Space: the final frontier.".match(countNonWhiteSpace).length == 23, ''Your regex should find 23 non-spaces in <code>"Space: the final frontier."</code>'');'
   - text: Your regex should find 21 non-spaces in <code>"MindYourPersonalSpace"</code>
-    testString: 'assert("MindYourPersonalSpace".match(countNonWhiteSpace).length == 21, "Your regex should find 21 non-spaces in <code>"MindYourPersonalSpace"</code>");'
+    testString: assert("MindYourPersonalSpace".match(countNonWhiteSpace).length == 21, 'Your regex should find 21 non-spaces in <code>"MindYourPersonalSpace"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-numbers-and-letters-of-the-alphabet.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-numbers-and-letters-of-the-alphabet.english.md
index f5d1bc145a..e5d2a36863 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-numbers-and-letters-of-the-alphabet.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-numbers-and-letters-of-the-alphabet.english.md
@@ -23,11 +23,11 @@ Create a single regex that matches a range of letters between <code>h</code> and
 ```yml
 tests:
   - text: Your regex <code>myRegex</code> should match 17 items.
-    testString: 'assert(result.length == 17, "Your regex <code>myRegex</code> should match 17 items.");'
+    testString: assert(result.length == 17, 'Your regex <code>myRegex</code> should match 17 items.');
   - text: Your regex <code>myRegex</code> should use the global flag.
-    testString: 'assert(myRegex.flags.match(/g/).length == 1, "Your regex <code>myRegex</code> should use the global flag.");'
+    testString: assert(myRegex.flags.match(/g/).length == 1, 'Your regex <code>myRegex</code> should use the global flag.');
   - text: Your regex <code>myRegex</code> should use the case insensitive flag.
-    testString: 'assert(myRegex.flags.match(/i/).length == 1, "Your regex <code>myRegex</code> should use the case insensitive flag.");'
+    testString: assert(myRegex.flags.match(/i/).length == 1, 'Your regex <code>myRegex</code> should use the case insensitive flag.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-character-with-multiple-possibilities.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-character-with-multiple-possibilities.english.md
index 415e980567..cbfa51336d 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-character-with-multiple-possibilities.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-character-with-multiple-possibilities.english.md
@@ -24,15 +24,15 @@ Use a character class with vowels (<code>a</code>, <code>e</code>, <code>i</code
 ```yml
 tests:
   - text: You should find all 25 vowels.
-    testString: 'assert(result.length == 25, "You should find all 25 vowels.");'
+    testString: assert(result.length == 25, 'You should find all 25 vowels.');
   - text: Your regex <code>vowelRegex</code> should use a character class.
-    testString: 'assert(/\[.*\]/.test(vowelRegex.source), "Your regex <code>vowelRegex</code> should use a character class.");'
+    testString: assert(/\[.*\]/.test(vowelRegex.source), 'Your regex <code>vowelRegex</code> should use a character class.');
   - text: Your regex <code>vowelRegex</code> should use the global flag.
-    testString: 'assert(vowelRegex.flags.match(/g/).length == 1, "Your regex <code>vowelRegex</code> should use the global flag.");'
+    testString: assert(vowelRegex.flags.match(/g/).length == 1, 'Your regex <code>vowelRegex</code> should use the global flag.');
   - text: Your regex <code>vowelRegex</code> should use the case insensitive flag.
-    testString: 'assert(vowelRegex.flags.match(/i/).length == 1, "Your regex <code>vowelRegex</code> should use the case insensitive flag.");'
+    testString: assert(vowelRegex.flags.match(/i/).length == 1, 'Your regex <code>vowelRegex</code> should use the case insensitive flag.');
   - text: Your regex should not match any consonants.
-    testString: 'assert(!/[b-df-hj-np-tv-z]/gi.test(result.join()), "Your regex should not match any consonants.");'
+    testString: assert(!/[b-df-hj-np-tv-z]/gi.test(result.join()), 'Your regex should not match any consonants.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-characters-not-specified.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-characters-not-specified.english.md
index d0044fcec2..4c6acd5519 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-characters-not-specified.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-single-characters-not-specified.english.md
@@ -22,11 +22,11 @@ Create a single regex that matches all characters that are not a number or a vow
 ```yml
 tests:
   - text: Your regex <code>myRegex</code> should match 9 items.
-    testString: 'assert(result.length == 9, "Your regex <code>myRegex</code> should match 9 items.");'
+    testString: assert(result.length == 9, 'Your regex <code>myRegex</code> should match 9 items.');
   - text: Your regex <code>myRegex</code> should use the global flag.
-    testString: 'assert(myRegex.flags.match(/g/).length == 1, "Your regex <code>myRegex</code> should use the global flag.");'
+    testString: assert(myRegex.flags.match(/g/).length == 1, 'Your regex <code>myRegex</code> should use the global flag.');
   - text: Your regex <code>myRegex</code> should use the case insensitive flag.
-    testString: 'assert(myRegex.flags.match(/i/).length == 1, "Your regex <code>myRegex</code> should use the case insensitive flag.");'
+    testString: assert(myRegex.flags.match(/i/).length == 1, 'Your regex <code>myRegex</code> should use the case insensitive flag.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-whitespace.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-whitespace.english.md
index 05347d09c6..ea3d18dfd8 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-whitespace.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/match-whitespace.english.md
@@ -22,15 +22,15 @@ Change the regex <code>countWhiteSpace</code> to look for multiple whitespace ch
 ```yml
 tests:
   - text: Your regex should use the global flag.
-    testString: 'assert(countWhiteSpace.global, "Your regex should use the global flag.");'
+    testString: assert(countWhiteSpace.global, 'Your regex should use the global flag.');
   - text: Your regex should use the shorthand character
-    testString: 'assert(/\\s/.test(countWhiteSpace.source), "Your regex should use the shorthand character <code>\s</code> to match all whitespace characters.");'
+    testString: assert(/\\s/.test(countWhiteSpace.source), 'Your regex should use the shorthand character <code>\s</code> to match all whitespace characters.');
   - text: Your regex should find eight spaces in <code>"Men are from Mars and women are from Venus."</code>
-    testString: 'assert("Men are from Mars and women are from Venus.".match(countWhiteSpace).length == 8, "Your regex should find eight spaces in <code>"Men are from Mars and women are from Venus."</code>");'
+    testString: assert("Men are from Mars and women are from Venus.".match(countWhiteSpace).length == 8, 'Your regex should find eight spaces in <code>"Men are from Mars and women are from Venus."</code>');
   - text: 'Your regex should find three spaces in <code>"Space: the final frontier."</code>'
-    testString: 'assert("Space: the final frontier.".match(countWhiteSpace).length == 3, "Your regex should find three spaces in <code>"Space: the final frontier."</code>");'
+    testString: 'assert("Space: the final frontier.".match(countWhiteSpace).length == 3, ''Your regex should find three spaces in <code>"Space: the final frontier."</code>'');'
   - text: Your regex should find no spaces in <code>"MindYourPersonalSpace"</code>
-    testString: 'assert("MindYourPersonalSpace".match(countWhiteSpace) == null, "Your regex should find no spaces in <code>"MindYourPersonalSpace"</code>");'
+    testString: assert("MindYourPersonalSpace".match(countWhiteSpace) == null, 'Your regex should find no spaces in <code>"MindYourPersonalSpace"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/positive-and-negative-lookahead.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/positive-and-negative-lookahead.english.md
index 4774231cf0..d5cfc716f7 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/positive-and-negative-lookahead.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/positive-and-negative-lookahead.english.md
@@ -27,21 +27,21 @@ Use <code>lookaheads</code> in the <code>pwRegex</code> to match passwords that
 ```yml
 tests:
   - text: Your regex should use two positive <code>lookaheads</code>.
-    testString: 'assert(pwRegex.source.match(/\(\?=.*?\)\(\?=.*?\)/) !== null, "Your regex should use two positive <code>lookaheads</code>.");'
+    testString: assert(pwRegex.source.match(/\(\?=.*?\)\(\?=.*?\)/) !== null, 'Your regex should use two positive <code>lookaheads</code>.');
   - text: Your regex should not match <code>"astronaut"</code>
-    testString: 'assert(!pwRegex.test("astronaut"), "Your regex should not match <code>"astronaut"</code>");'
+    testString: assert(!pwRegex.test("astronaut"), 'Your regex should not match <code>"astronaut"</code>');
   - text: Your regex should not match <code>"airplanes"</code>
-    testString: 'assert(!pwRegex.test("airplanes"), "Your regex should not match <code>"airplanes"</code>");'
+    testString: assert(!pwRegex.test("airplanes"), 'Your regex should not match <code>"airplanes"</code>');
   - text: Your regex should not match <code>"banan1"</code>
-    testString: 'assert(!pwRegex.test("banan1"), "Your regex should not match <code>"banan1"</code>");'
+    testString: assert(!pwRegex.test("banan1"), 'Your regex should not match <code>"banan1"</code>');
   - text: Your regex should match <code>"bana12"</code>
-    testString: 'assert(pwRegex.test("bana12"), "Your regex should match <code>"bana12"</code>");'
+    testString: assert(pwRegex.test("bana12"), 'Your regex should match <code>"bana12"</code>');
   - text: Your regex should match <code>"abc123"</code>
-    testString: 'assert(pwRegex.test("abc123"), "Your regex should match <code>"abc123"</code>");'
+    testString: assert(pwRegex.test("abc123"), 'Your regex should match <code>"abc123"</code>');
   - text: Your regex should not match <code>"123"</code>
-    testString: 'assert(!pwRegex.test("123"), "Your regex should not match <code>"123"</code>");'
+    testString: assert(!pwRegex.test("123"), 'Your regex should not match <code>"123"</code>');
   - text: Your regex should not match <code>"1234"</code>
-    testString: 'assert(!pwRegex.test("1234"), "Your regex should not match <code>"1234"</code>");'
+    testString: assert(!pwRegex.test("1234"), 'Your regex should not match <code>"1234"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/remove-whitespace-from-start-and-end.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/remove-whitespace-from-start-and-end.english.md
index 57b3d6dd33..e442a1955f 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/remove-whitespace-from-start-and-end.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/remove-whitespace-from-start-and-end.english.md
@@ -20,12 +20,12 @@ Write a regex and use the appropriate string methods to remove whitespace at the
 
 ```yml
 tests:
-  - text: '<code>result</code> should equal to <code>"Hello, World!"</code>'
-    testString: 'assert(result == "Hello, World!", "<code>result</code> should equal to <code>"Hello, World!"</code>");'
+  - text: <code>result</code> should equal to <code>"Hello, World!"</code>
+    testString: assert(result == "Hello, World!", '<code>result</code> should equal to <code>"Hello, World!"</code>');
   - text: You should not use the <code>.trim()</code> method.
-    testString: 'assert(!code.match(/\.trim\(.*?\)/), "You should not use the <code>.trim()</code> method.");'
+    testString: assert(!code.match(/\.trim\(.*?\)/), 'You should not use the <code>.trim()</code> method.');
   - text: The <code>result</code> variable should not be set equal to a string.
-    testString: 'assert(!code.match(/result\s*=\s*".*?"/), "The <code>result</code> variable should not be set equal to a string.");'
+    testString: assert(!code.match(/result\s*=\s*".*?"/), 'The <code>result</code> variable should not be set equal to a string.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/restrict-possible-usernames.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/restrict-possible-usernames.english.md
index 9395f204bc..58becfb24e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/restrict-possible-usernames.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/restrict-possible-usernames.english.md
@@ -24,17 +24,17 @@ Change the regex <code>userCheck</code> to fit the constraints listed above.
 ```yml
 tests:
   - text: Your regex should match <code>JACK</code>
-    testString: 'assert(userCheck.test("JACK"), "Your regex should match <code>JACK</code>");'
+    testString: assert(userCheck.test("JACK"), 'Your regex should match <code>JACK</code>');
   - text: Your regex should not match <code>J</code>
-    testString: 'assert(!userCheck.test("J"), "Your regex should not match <code>J</code>");'
+    testString: assert(!userCheck.test("J"), 'Your regex should not match <code>J</code>');
   - text: Your regex should match <code>Oceans11</code>
-    testString: 'assert(userCheck.test("Oceans11"), "Your regex should match <code>Oceans11</code>");'
+    testString: assert(userCheck.test("Oceans11"), 'Your regex should match <code>Oceans11</code>');
   - text: Your regex should match <code>RegexGuru</code>
-    testString: 'assert(userCheck.test("RegexGuru"), "Your regex should match <code>RegexGuru</code>");'
+    testString: assert(userCheck.test("RegexGuru"), 'Your regex should match <code>RegexGuru</code>');
   - text: Your regex should not match <code>007</code>
-    testString: 'assert(!userCheck.test("007"), "Your regex should not match <code>007</code>");'
+    testString: assert(!userCheck.test("007"), 'Your regex should not match <code>007</code>');
   - text: Your regex should not match <code>9</code>
-    testString: 'assert(!userCheck.test("9"), "Your regex should not match <code>9</code>");'
+    testString: assert(!userCheck.test("9"), 'Your regex should not match <code>9</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/reuse-patterns-using-capture-groups.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/reuse-patterns-using-capture-groups.english.md
index b717912d25..f7a01ff08b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/reuse-patterns-using-capture-groups.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/reuse-patterns-using-capture-groups.english.md
@@ -25,25 +25,25 @@ Use <code>capture groups</code> in <code>reRegex</code> to match numbers that ar
 ```yml
 tests:
   - text: Your regex should use the shorthand character class for digits.
-    testString: 'assert(reRegex.source.match(/\\d/), "Your regex should use the shorthand character class for digits.");'
+    testString: assert(reRegex.source.match(/\\d/), 'Your regex should use the shorthand character class for digits.');
   - text: Your regex should reuse the capture group twice.
-    testString: 'assert(reRegex.source.match(/\\\d/g).length === 2, "Your regex should reuse the capture group twice.");'
+    testString: assert(reRegex.source.match(/\\\d/g).length === 2, 'Your regex should reuse the capture group twice.');
   - text: Your regex should have two spaces separating the three numbers.
-    testString: 'assert(reRegex.source.match(/\\s/g).length === 2, "Your regex should have two spaces separating the three numbers.");'
+    testString: assert(reRegex.source.match(/\\s/g).length === 2, 'Your regex should have two spaces separating the three numbers.');
   - text: Your regex should match <code>"42 42 42"</code>.
-    testString: 'assert(reRegex.test("42 42 42"), "Your regex should match <code>"42 42 42"</code>.");'
+    testString: assert(reRegex.test("42 42 42"), 'Your regex should match <code>"42 42 42"</code>.');
   - text: Your regex should match <code>"100 100 100"</code>.
-    testString: 'assert(reRegex.test("100 100 100"), "Your regex should match <code>"100 100 100"</code>.");'
+    testString: assert(reRegex.test("100 100 100"), 'Your regex should match <code>"100 100 100"</code>.');
   - text: Your regex should not match <code>"42 42 42 42"</code>.
-    testString: 'assert.equal(("42 42 42 42").match(reRegex.source), null, "Your regex should not match <code>"42 42 42 42"</code>.");'
+    testString: assert.equal(("42 42 42 42").match(reRegex.source), null, 'Your regex should not match <code>"42 42 42 42"</code>.');
   - text: Your regex should not match <code>"42 42"</code>.
-    testString: 'assert.equal(("42 42").match(reRegex.source), null, "Your regex should not match <code>"42 42"</code>.");'
+    testString: assert.equal(("42 42").match(reRegex.source), null, 'Your regex should not match <code>"42 42"</code>.');
   - text: Your regex should not match <code>"101 102 103"</code>.
-    testString: 'assert(!reRegex.test("101 102 103"), "Your regex should not match <code>"101 102 103"</code>.");'
+    testString: assert(!reRegex.test("101 102 103"), 'Your regex should not match <code>"101 102 103"</code>.');
   - text: Your regex should not match <code>"1 2 3"</code>.
-    testString: 'assert(!reRegex.test("1 2 3"), "Your regex should not match <code>"1 2 3"</code>.");'
+    testString: assert(!reRegex.test("1 2 3"), 'Your regex should not match <code>"1 2 3"</code>.');
   - text: Your regex should match <code>"10 10 10"</code>.
-    testString: 'assert(reRegex.test("10 10 10"), "Your regex should match <code>"10 10 10"</code>.");'
+    testString: assert(reRegex.test("10 10 10"), 'Your regex should match <code>"10 10 10"</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches.english.md
index 9623e78da1..82c9f46c1e 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-exact-number-of-matches.english.md
@@ -23,17 +23,17 @@ Change the regex <code>timRegex</code> to match the word <code>"Timber"</code> o
 ```yml
 tests:
   - text: Your regex should use curly brackets.
-    testString: 'assert(timRegex.source.match(/{.*?}/).length > 0, "Your regex should use curly brackets.");'
+    testString: assert(timRegex.source.match(/{.*?}/).length > 0, 'Your regex should use curly brackets.');
   - text: Your regex should not match <code>"Timber"</code>
-    testString: 'assert(!timRegex.test("Timber"), "Your regex should not match <code>"Timber"</code>");'
+    testString: assert(!timRegex.test("Timber"), 'Your regex should not match <code>"Timber"</code>');
   - text: Your regex should not match <code>"Timmber"</code>
-    testString: 'assert(!timRegex.test("Timmber"), "Your regex should not match <code>"Timmber"</code>");'
+    testString: assert(!timRegex.test("Timmber"), 'Your regex should not match <code>"Timmber"</code>');
   - text: Your regex should not match <code>"Timmmber"</code>
-    testString: 'assert(!timRegex.test("Timmmber"), "Your regex should not match <code>"Timmmber"</code>");'
+    testString: assert(!timRegex.test("Timmmber"), 'Your regex should not match <code>"Timmmber"</code>');
   - text: Your regex should match <code>"Timmmmber"</code>
-    testString: 'assert(timRegex.test("Timmmmber"), "Your regex should match <code>"Timmmmber"</code>");'
+    testString: assert(timRegex.test("Timmmmber"), 'Your regex should match <code>"Timmmmber"</code>');
   - text: Your regex should not match <code>"Timber"</code> with 30 <code>m</code>'s in it.
-    testString: 'assert(!timRegex.test("Ti" + "m".repeat(30) + "ber"), "Your regex should not match <code>"Timber"</code> with 30 <code>m</code>\"s in it.");'
+    testString: assert(!timRegex.test("Ti" + "m".repeat(30) + "ber"), 'Your regex should not match <code>"Timber"</code> with 30 <code>m</code>\'s in it.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-only-the-lower-number-of-matches.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-only-the-lower-number-of-matches.english.md
index a26791b0ef..1972e99aec 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-only-the-lower-number-of-matches.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-only-the-lower-number-of-matches.english.md
@@ -23,19 +23,19 @@ Change the regex <code>haRegex</code> to match the word <code>"Hazzah"</code> on
 ```yml
 tests:
   - text: Your regex should use curly brackets.
-    testString: 'assert(haRegex.source.match(/{.*?}/).length > 0, "Your regex should use curly brackets.");'
+    testString: assert(haRegex.source.match(/{.*?}/).length > 0, 'Your regex should use curly brackets.');
   - text: Your regex should not match <code>"Hazzah"</code>
-    testString: 'assert(!haRegex.test("Hazzah"), "Your regex should not match <code>"Hazzah"</code>");'
+    testString: assert(!haRegex.test("Hazzah"), 'Your regex should not match <code>"Hazzah"</code>');
   - text: Your regex should not match <code>"Hazzzah"</code>
-    testString: 'assert(!haRegex.test("Hazzzah"), "Your regex should not match <code>"Hazzzah"</code>");'
+    testString: assert(!haRegex.test("Hazzzah"), 'Your regex should not match <code>"Hazzzah"</code>');
   - text: Your regex should match <code>"Hazzzzah"</code>
-    testString: 'assert(haRegex.test("Hazzzzah"), "Your regex should match <code>"Hazzzzah"</code>");'
+    testString: assert(haRegex.test("Hazzzzah"), 'Your regex should match <code>"Hazzzzah"</code>');
   - text: Your regex should match <code>"Hazzzzzah"</code>
-    testString: 'assert(haRegex.test("Hazzzzzah"), "Your regex should match <code>"Hazzzzzah"</code>");'
+    testString: assert(haRegex.test("Hazzzzzah"), 'Your regex should match <code>"Hazzzzzah"</code>');
   - text: Your regex should match <code>"Hazzzzzzah"</code>
-    testString: 'assert(haRegex.test("Hazzzzzzah"), "Your regex should match <code>"Hazzzzzzah"</code>");'
+    testString: assert(haRegex.test("Hazzzzzzah"), 'Your regex should match <code>"Hazzzzzzah"</code>');
   - text: Your regex should match <code>"Hazzah"</code> with 30 <code>z</code>\'s in it.
-    testString: 'assert(haRegex.test("Ha" + "z".repeat(30) + "ah"), "Your regex should match <code>"Hazzah"</code> with 30 <code>z</code>\"s in it.");'
+    testString: assert(haRegex.test("Ha" + "z".repeat(30) + "ah"), 'Your regex should match <code>"Hazzah"</code> with 30 <code>z</code>\'s in it.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches.english.md
index bbe9c6e4de..b8e8dd1a55 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches.english.md
@@ -23,19 +23,19 @@ Change the regex <code>ohRegex</code> to match only <code>3</code> to <code>6</c
 ```yml
 tests:
   - text: Your regex should use curly brackets.
-    testString: 'assert(ohRegex.source.match(/{.*?}/).length > 0, "Your regex should use curly brackets.");'
+    testString: assert(ohRegex.source.match(/{.*?}/).length > 0, 'Your regex should use curly brackets.');
   - text: Your regex should not match <code>"Ohh no"</code>
-    testString: 'assert(!ohRegex.test("Ohh no"), "Your regex should not match <code>"Ohh no"</code>");'
+    testString: assert(!ohRegex.test("Ohh no"), 'Your regex should not match <code>"Ohh no"</code>');
   - text: Your regex should match <code>"Ohhh no"</code>
-    testString: 'assert(ohRegex.test("Ohhh no"), "Your regex should match <code>"Ohhh no"</code>");'
+    testString: assert(ohRegex.test("Ohhh no"), 'Your regex should match <code>"Ohhh no"</code>');
   - text: Your regex should match <code>"Ohhhh no"</code>
-    testString: 'assert(ohRegex.test("Ohhhh no"), "Your regex should match <code>"Ohhhh no"</code>");'
+    testString: assert(ohRegex.test("Ohhhh no"), 'Your regex should match <code>"Ohhhh no"</code>');
   - text: Your regex should match <code>"Ohhhhh no"</code>
-    testString: 'assert(ohRegex.test("Ohhhhh no"), "Your regex should match <code>"Ohhhhh no"</code>");'
+    testString: assert(ohRegex.test("Ohhhhh no"), 'Your regex should match <code>"Ohhhhh no"</code>');
   - text: Your regex should match <code>"Ohhhhhh no"</code>
-    testString: 'assert(ohRegex.test("Ohhhhhh no"), "Your regex should match <code>"Ohhhhhh no"</code>");'
+    testString: assert(ohRegex.test("Ohhhhhh no"), 'Your regex should match <code>"Ohhhhhh no"</code>');
   - text: Your regex should not match <code>"Ohhhhhhh no"</code>
-    testString: 'assert(!ohRegex.test("Ohhhhhhh no"), "Your regex should not match <code>"Ohhhhhhh no"</code>");'
+    testString: assert(!ohRegex.test("Ohhhhhhh no"), 'Your regex should not match <code>"Ohhhhhhh no"</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/use-capture-groups-to-search-and-replace.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/use-capture-groups-to-search-and-replace.english.md
index 75c7725d76..fd4000405b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/use-capture-groups-to-search-and-replace.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/use-capture-groups-to-search-and-replace.english.md
@@ -24,11 +24,11 @@ Write a regex so that it will search for the string <code>"good"</code>. Then up
 ```yml
 tests:
   - text: You should use <code>.replace()</code> to search and replace.
-    testString: 'assert(code.match(/\.replace\(.*\)/), "You should use <code>.replace()</code> to search and replace.");'
+    testString: assert(code.match(/\.replace\(.*\)/), 'You should use <code>.replace()</code> to search and replace.');
   - text: Your regex should change <code>"This sandwich is good."</code> to <code>"This sandwich is okey-dokey."</code>
-    testString: 'assert(result == "This sandwich is okey-dokey." && replaceText === "okey-dokey", "Your regex should change <code>"This sandwich is good."</code> to <code>"This sandwich is okey-dokey."</code>");'
+    testString: assert(result == "This sandwich is okey-dokey." && replaceText === "okey-dokey", 'Your regex should change <code>"This sandwich is good."</code> to <code>"This sandwich is okey-dokey."</code>');
   - text: You should not change the last line.
-    testString: 'assert(code.match(/result\s*=\s*huhText\.replace\(.*?\)/), "You should not change the last line.");'
+    testString: assert(code.match(/result\s*=\s*huhText\.replace\(.*?\)/), 'You should not change the last line.');
 
 ```
 
diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/using-the-test-method.english.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/using-the-test-method.english.md
index 57f49a498e..508097ce0b 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/using-the-test-method.english.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/regular-expressions/using-the-test-method.english.md
@@ -23,9 +23,9 @@ Apply the regex <code>myRegex</code> on the string <code>myString</code> using t
 ```yml
 tests:
   - text: You should use <code>.test()</code> to test the regex.
-    testString: 'assert(code.match(/myRegex.test\(\s*myString\s*\)/), "You should use <code>.test()</code> to test the regex.");'
+    testString: assert(code.match(/myRegex.test\(\s*myString\s*\)/), 'You should use <code>.test()</code> to test the regex.');
   - text: Your result should return <code>true</code>.
-    testString: 'assert(result === true, "Your result should return <code>true</code>.");'
+    testString: assert(result === true, 'Your result should return <code>true</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-elements-within-your-bootstrap-wells.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-elements-within-your-bootstrap-wells.english.md
index baba7ddece..1fd469b0b2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-elements-within-your-bootstrap-wells.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-elements-within-your-bootstrap-wells.english.md
@@ -21,11 +21,11 @@ Nest three <code>button</code> elements within each of your <code>well</code> <c
 ```yml
 tests:
   - text: Nest three <code>button</code> elements within each of your <code>div</code> elements with class <code>well</code>.
-    testString: 'assert($("div.well:eq(0)").children("button").length === 3 && $("div.well:eq(1)").children("button").length === 3, "Nest three <code>button</code> elements within each of your <code>div</code> elements with class <code>well</code>.");'
+    testString: assert($("div.well:eq(0)").children("button").length === 3 && $("div.well:eq(1)").children("button").length === 3, 'Nest three <code>button</code> elements within each of your <code>div</code> elements with class <code>well</code>.');
   - text: You should have a total of 6 <code>button</code> elements.
-    testString: 'assert($("button") && $("button").length > 5, "You should have a total of 6 <code>button</code> elements.");'
+    testString: assert($("button") && $("button").length > 5, 'You should have a total of 6 <code>button</code> elements.');
   - text: Make sure all your <code>button</code> elements have closing tags.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure all your <code>button</code> elements have closing tags.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure all your <code>button</code> elements have closing tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md
index d83d2befa7..d7ad5f285c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-all-of-our-buttons.english.md
@@ -24,12 +24,12 @@ Note: The <code>span</code> element is an acceptable alternative to the <code>i<
 
 ```yml
 tests:
-  - text: 'You should add a <code>&#60;i class="fa fa-info-circle"&#62;&#60;/i&#62;</code> within your info button element.'
-    testString: 'assert($(".btn-info > i").is(".fa.fa-info-circle") || $(".btn-info > span").is(".fa.fa-info-circle"), "You should add a <code>&#60;i class="fa fa-info-circle"&#62;&#60;/i&#62;</code> within your info button element.");'
-  - text: 'You should add a <code>&#60;i class="fa fa-trash"&#62;&#60;/i&#62;</code> within your delete button element.'
-    testString: 'assert($(".btn-danger > i").is(".fa.fa-trash") || $(".btn-danger > span").is(".fa.fa-trash"), "You should add a <code>&#60;i class="fa fa-trash"&#62;&#60;/i&#62;</code> within your delete button element.");'
-  - text: 'Make sure each of your <code>i</code> elements has a closing tag and <code>&#60;i class="fa fa-thumbs-up"&#62;&#60;/i&#62;</code> is in your like button element.'
-    testString: 'assert(code.match(/<\/i>|<\/span/g) && code.match(/<\/i|<\/span>/g).length > 2 && ($(".btn-primary > i").is(".fa.fa-thumbs-up") || $(".btn-primary > span").is(".fa.fa-thumbs-up")), "Make sure each of your <code>i</code> elements has a closing tag and <code>&#60;i class="fa fa-thumbs-up"&#62;&#60;/i&#62;</code> is in your like button element.");'
+  - text: You should add a <code>&#60;i class="fa fa-info-circle"&#62;&#60;/i&#62;</code> within your info button element.
+    testString: assert($(".btn-info > i").is(".fa.fa-info-circle") || $(".btn-info > span").is(".fa.fa-info-circle"), 'You should add a <code>&#60;i class="fa fa-info-circle"&#62;&#60;/i&#62;</code> within your info button element.');
+  - text: You should add a <code>&#60;i class="fa fa-trash"&#62;&#60;/i&#62;</code> within your delete button element.
+    testString: assert($(".btn-danger > i").is(".fa.fa-trash") || $(".btn-danger > span").is(".fa.fa-trash"), 'You should add a <code>&#60;i class="fa fa-trash"&#62;&#60;/i&#62;</code> within your delete button element.');
+  - text: Make sure each of your <code>i</code> elements has a closing tag and <code>&#60;i class="fa fa-thumbs-up"&#62;&#60;/i&#62;</code> is in your like button element.
+    testString: assert(code.match(/<\/i>|<\/span/g) && code.match(/<\/i|<\/span>/g).length > 2 && ($(".btn-primary > i").is(".fa.fa-thumbs-up") || $(".btn-primary > span").is(".fa.fa-thumbs-up")), 'Make sure each of your <code>i</code> elements has a closing tag and <code>&#60;i class="fa fa-thumbs-up"&#62;&#60;/i&#62;</code> is in your like button element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md
index 36041ca47b..86e24760d9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-font-awesome-icons-to-our-buttons.english.md
@@ -30,13 +30,13 @@ Use Font Awesome to add a <code>thumbs-up</code> icon to your like button by giv
 ```yml
 tests:
   - text: Add an <code>i</code> element with the classes <code>fa</code> and <code>fa-thumbs-up</code>.
-    testString: 'assert($("i").is(".fa.fa-thumbs-up") || $("span").is(".fa.fa-thumbs-up"), "Add an <code>i</code> element with the classes <code>fa</code> and <code>fa-thumbs-up</code>.");'
+    testString: assert($("i").is(".fa.fa-thumbs-up") || $("span").is(".fa.fa-thumbs-up"), 'Add an <code>i</code> element with the classes <code>fa</code> and <code>fa-thumbs-up</code>.');
   - text: Your <code>fa-thumbs-up</code> icon should be located within the Like button.
-    testString: 'assert(($("i.fa-thumbs-up").parent().text().match(/Like/gi) && $(".btn-primary > i").is(".fa.fa-thumbs-up")) || ($("span.fa-thumbs-up").parent().text().match(/Like/gi) && $(".btn-primary > span").is(".fa.fa-thumbs-up")), "Your <code>fa-thumbs-up</code> icon should be located within the Like button.");'
+    testString: assert(($("i.fa-thumbs-up").parent().text().match(/Like/gi) && $(".btn-primary > i").is(".fa.fa-thumbs-up")) || ($("span.fa-thumbs-up").parent().text().match(/Like/gi) && $(".btn-primary > span").is(".fa.fa-thumbs-up")), 'Your <code>fa-thumbs-up</code> icon should be located within the Like button.');
   - text: Nest your <code>i</code> element within your <code>button</code> element.
-    testString: 'assert($("button").children("i").length > 0 || $("button").children("span").length > 0, "Nest your <code>i</code> element within your <code>button</code> element.");'
+    testString: assert($("button").children("i").length > 0 || $("button").children("span").length > 0, 'Nest your <code>i</code> element within your <code>button</code> element.');
   - text: Make sure your icon element has a closing tag.
-    testString: 'assert(code.match(/<\/i>|<\/span>/g), "Make sure your icon element has a closing tag.");'
+    testString: assert(code.match(/<\/i>|<\/span>/g), 'Make sure your icon element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-id-attributes-to-bootstrap-elements.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-id-attributes-to-bootstrap-elements.english.md
index 56537ecd8f..ce9fa0face 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-id-attributes-to-bootstrap-elements.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/add-id-attributes-to-bootstrap-elements.english.md
@@ -25,9 +25,9 @@ Give the well on the left the id of <code>left-well</code>. Give the well on the
 ```yml
 tests:
   - text: Give your left <code>well</code> the id of <code>left-well</code>.
-    testString: 'assert($(".col-xs-6").children("#left-well") && $(".col-xs-6").children("#left-well").length > 0, "Give your left <code>well</code> the id of <code>left-well</code>.");'
+    testString: assert($(".col-xs-6").children("#left-well") && $(".col-xs-6").children("#left-well").length > 0, 'Give your left <code>well</code> the id of <code>left-well</code>.');
   - text: Give your right <code>well</code> the id of <code>right-well</code>.
-    testString: 'assert($(".col-xs-6").children("#right-well") && $(".col-xs-6").children("#right-well").length > 0, "Give your right <code>well</code> the id of <code>right-well</code>.");'
+    testString: assert($(".col-xs-6").children("#right-well") && $(".col-xs-6").children("#right-well").length > 0, 'Give your right <code>well</code> the id of <code>right-well</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/apply-the-default-bootstrap-button-style.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/apply-the-default-bootstrap-button-style.english.md
index 417533ab3d..51d0afc73b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/apply-the-default-bootstrap-button-style.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/apply-the-default-bootstrap-button-style.english.md
@@ -22,9 +22,9 @@ Apply both the <code>btn</code> and <code>btn-default</code> classes to each of
 ```yml
 tests:
   - text: Apply the <code>btn</code> class to each of your <code>button</code> elements.
-    testString: 'assert($(".btn").length > 5, "Apply the <code>btn</code> class to each of your <code>button</code> elements.");'
+    testString: assert($(".btn").length > 5, 'Apply the <code>btn</code> class to each of your <code>button</code> elements.');
   - text: Apply the <code>btn-default</code> class to each of your <code>button</code> elements.
-    testString: 'assert($(".btn-default").length > 5, "Apply the <code>btn-default</code> class to each of your <code>button</code> elements.");'
+    testString: assert($(".btn-default").length > 5, 'Apply the <code>btn-default</code> class to each of your <code>button</code> elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md
index a037a011fb..68d622ddbe 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/call-out-optional-actions-with-btn-info.english.md
@@ -22,13 +22,13 @@ Note that these buttons still need the <code>btn</code> and <code>btn-block</cod
 ```yml
 tests:
   - text: Create a new <code>button</code> element with the text "Info".
-    testString: 'assert(new RegExp("info","gi").test($("button").text()), "Create a new <code>button</code> element with the text "Info".");'
+    testString: assert(new RegExp("info","gi").test($("button").text()), 'Create a new <code>button</code> element with the text "Info".');
   - text: Both of your Bootstrap buttons should have the <code>btn</code> and <code>btn-block</code> classes.
-    testString: 'assert($("button.btn-block.btn").length > 1, "Both of your Bootstrap buttons should have the <code>btn</code> and <code>btn-block</code> classes.");'
+    testString: assert($("button.btn-block.btn").length > 1, 'Both of your Bootstrap buttons should have the <code>btn</code> and <code>btn-block</code> classes.');
   - text: Your new button should have the class <code>btn-info</code>.
-    testString: 'assert($("button").hasClass("btn-info"), "Your new button should have the class <code>btn-info</code>.");'
+    testString: assert($("button").hasClass("btn-info"), 'Your new button should have the class <code>btn-info</code>.');
   - text: Make sure all your <code>button</code> elements have a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure all your <code>button</code> elements have a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure all your <code>button</code> elements have a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md
index b72b8a9a10..cb7549c5f7 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/center-text-with-bootstrap.english.md
@@ -22,9 +22,9 @@ Remember that you can add several classes to the same element by separating each
 ```yml
 tests:
   - text: Your <code>h2</code> element should be centered by applying the class <code>text-center</code>
-    testString: 'assert($("h2").hasClass("text-center"), "Your <code>h2</code> element should be centered by applying the class <code>text-center</code>");'
+    testString: assert($("h2").hasClass("text-center"), 'Your <code>h2</code> element should be centered by applying the class <code>text-center</code>');
   - text: Your <code>h2</code> element should still have the class <code>red-text</code>
-    testString: 'assert($("h2").hasClass("red-text"), "Your <code>h2</code> element should still have the class <code>red-text</code>");'
+    testString: assert($("h2").hasClass("red-text"), 'Your <code>h2</code> element should still have the class <code>red-text</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md
index 9e8b55418f..91324f157e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-block-element-bootstrap-button.english.md
@@ -29,11 +29,11 @@ Add Bootstrap's <code>btn-block</code> class to your Bootstrap button.
 ```yml
 tests:
   - text: Your button should still have the <code>btn</code> and <code>btn-default</code> classes.
-    testString: 'assert($("button").hasClass("btn") && $("button").hasClass("btn-default"), "Your button should still have the <code>btn</code> and <code>btn-default</code> classes.");'
+    testString: assert($("button").hasClass("btn") && $("button").hasClass("btn-default"), 'Your button should still have the <code>btn</code> and <code>btn-default</code> classes.');
   - text: Your button should have the class <code>btn-block</code>.
-    testString: 'assert($("button").hasClass("btn-block"), "Your button should have the class <code>btn-block</code>.");'
+    testString: assert($("button").hasClass("btn-block"), 'Your button should have the class <code>btn-block</code>.');
   - text: Make sure all your <code>button</code> elements have a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure all your <code>button</code> elements have a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure all your <code>button</code> elements have a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md
index 58df25360e..38dabff854 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-button.english.md
@@ -21,11 +21,11 @@ Create a new <code>button</code> element below your large kitten photo. Give it
 ```yml
 tests:
   - text: Create a new <code>button</code> element with the text "Like".
-    testString: 'assert(new RegExp("like","gi").test($("button").text()) && ($("img.img-responsive + button.btn").length > 0), "Create a new <code>button</code> element with the text "Like".");'
+    testString: assert(new RegExp("like","gi").test($("button").text()) && ($("img.img-responsive + button.btn").length > 0), 'Create a new <code>button</code> element with the text "Like".');
   - text: 'Your new button should have two classes: <code>btn</code> and <code>btn-default</code>.'
-    testString: 'assert($("button").hasClass("btn") && $("button").hasClass("btn-default"), "Your new button should have two classes: <code>btn</code> and <code>btn-default</code>.");'
+    testString: 'assert($("button").hasClass("btn") && $("button").hasClass("btn-default"), ''Your new button should have two classes: <code>btn</code> and <code>btn-default</code>.'');'
   - text: Make sure all your <code>button</code> elements have a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure all your <code>button</code> elements have a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure all your <code>button</code> elements have a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-headline.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-headline.english.md
index 07cf11b62d..96a531daf2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-headline.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-headline.english.md
@@ -23,15 +23,15 @@ Color your <code>h3</code> element with the <code>text-primary</code> Bootstrap
 ```yml
 tests:
   - text: Add a <code>h3</code> element to your page.
-    testString: 'assert($("h3") && $("h3").length > 0, "Add a <code>h3</code> element to your page.");'
+    testString: assert($("h3") && $("h3").length > 0, 'Add a <code>h3</code> element to your page.');
   - text: Make sure your <code>h3</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/h3>/g) && code.match(/<h3/g) && code.match(/<\/h3>/g).length === code.match(/<h3/g).length, "Make sure your <code>h3</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/h3>/g) && code.match(/<h3/g) && code.match(/<\/h3>/g).length === code.match(/<h3/g).length, 'Make sure your <code>h3</code> element has a closing tag.');
   - text: Your <code>h3</code> element should be colored by applying the class <code>text-primary</code>
-    testString: 'assert($("h3").hasClass("text-primary"), "Your <code>h3</code> element should be colored by applying the class <code>text-primary</code>");'
+    testString: assert($("h3").hasClass("text-primary"), 'Your <code>h3</code> element should be colored by applying the class <code>text-primary</code>');
   - text: Your <code>h3</code> element should be centered by applying the class <code>text-center</code>
-    testString: 'assert($("h3").hasClass("text-center"), "Your <code>h3</code> element should be centered by applying the class <code>text-center</code>");'
+    testString: assert($("h3").hasClass("text-center"), 'Your <code>h3</code> element should be centered by applying the class <code>text-center</code>');
   - text: Your <code>h3</code> element should have the text <code>jQuery Playground</code>.
-    testString: 'assert.isTrue((/jquery(\s)+playground/gi).test($("h3").text()), "Your <code>h3</code> element should have the text <code>jQuery Playground</code>.");'
+    testString: assert.isTrue((/jquery(\s)+playground/gi).test($("h3").text()), 'Your <code>h3</code> element should have the text <code>jQuery Playground</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-row.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-row.english.md
index b5f6825748..f766f07c62 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-row.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-bootstrap-row.english.md
@@ -21,13 +21,13 @@ Create a <code>div</code> element below the <code>h3</code> tag, with a class of
 ```yml
 tests:
   - text: Add a <code>div</code> element below your <code>h3</code> element.
-    testString: 'assert(($("div").length > 1) && ($("div.row h3.text-primary").length == 0) && ($("div.row + h3.text-primary").length == 0) && ($("h3.text-primary + div.row").length > 0), "Add a <code>div</code> element below your <code>h3</code> element.");'
+    testString: assert(($("div").length > 1) && ($("div.row h3.text-primary").length == 0) && ($("div.row + h3.text-primary").length == 0) && ($("h3.text-primary + div.row").length > 0), 'Add a <code>div</code> element below your <code>h3</code> element.');
   - text: Your <code>div</code> element should have the class <code>row</code>
-    testString: 'assert($("div").hasClass("row"), "Your <code>div</code> element should have the class <code>row</code>");'
+    testString: assert($("div").hasClass("row"), 'Your <code>div</code> element should have the class <code>row</code>');
   - text: Your <code>row div</code> should be nested inside the <code>container-fluid div</code>
-    testString: 'assert($("div.container-fluid div.row").length > 0, "Your <code>row div</code> should be nested inside the <code>container-fluid div</code>");'
+    testString: assert($("div.container-fluid div.row").length > 0, 'Your <code>row div</code> should be nested inside the <code>container-fluid div</code>');
   - text: Make sure your <code>div</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure your <code>div</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure your <code>div</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-class-to-target-with-jquery-selectors.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-class-to-target-with-jquery-selectors.english.md
index 4e8e6e80b7..03759dfd9f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-class-to-target-with-jquery-selectors.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-class-to-target-with-jquery-selectors.english.md
@@ -21,7 +21,7 @@ Give each of your <code>button</code> elements the class <code>target</code>.
 ```yml
 tests:
   - text: Apply the <code>target</code> class to each of your <code>button</code> elements.
-    testString: 'assert($(".target").length > 5, "Apply the <code>target</code> class to each of your <code>button</code> elements.");'
+    testString: assert($(".target").length > 5, 'Apply the <code>target</code> class to each of your <code>button</code> elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md
index 8fab82fee3..7c27322c68 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-a-custom-heading.english.md
@@ -23,13 +23,13 @@ Notice how the image is now just the right size to fit along the text?
 ```yml
 tests:
   - text: Your <code>h2</code> element and topmost <code>img</code> element should both be nested together within a <code>div</code> element with the class <code>row</code>.
-    testString: 'assert($("div.row:has(h2)").length > 0 && $("div.row:has(img)").length > 0, "Your <code>h2</code> element and topmost <code>img</code> element should both be nested together within a <code>div</code> element with the class <code>row</code>.");'
+    testString: assert($("div.row:has(h2)").length > 0 && $("div.row:has(img)").length > 0, 'Your <code>h2</code> element and topmost <code>img</code> element should both be nested together within a <code>div</code> element with the class <code>row</code>.');
   - text: Nest your topmost <code>img</code> element within a <code>div</code> with the class <code>col-xs-4</code>.
-    testString: 'assert($("div.col-xs-4:has(img)").length > 0 && $("div.col-xs-4:has(div)").length === 0, "Nest your topmost <code>img</code> element within a <code>div</code> with the class <code>col-xs-4</code>.");'
+    testString: assert($("div.col-xs-4:has(img)").length > 0 && $("div.col-xs-4:has(div)").length === 0, 'Nest your topmost <code>img</code> element within a <code>div</code> with the class <code>col-xs-4</code>.');
   - text: Nest your <code>h2</code> element within a <code>div</code> with the class <code>col-xs-8</code>.
-    testString: 'assert($("div.col-xs-8:has(h2)").length > 0 && $("div.col-xs-8:has(div)").length === 0, "Nest your <code>h2</code> element within a <code>div</code> with the class <code>col-xs-8</code>.");'
+    testString: assert($("div.col-xs-8:has(h2)").length > 0 && $("div.col-xs-8:has(div)").length === 0, 'Nest your <code>h2</code> element within a <code>div</code> with the class <code>col-xs-8</code>.');
   - text: Make sure each of your <code>div</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure each of your <code>div</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure each of your <code>div</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-bootstrap-wells.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-bootstrap-wells.english.md
index e632cc00cd..b95f822569 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-bootstrap-wells.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/create-bootstrap-wells.english.md
@@ -21,11 +21,11 @@ Nest one <code>div</code> element with the class <code>well</code> within each o
 ```yml
 tests:
   - text: Add a <code>div</code> element with the class <code>well</code> inside each of your <code>div</code> elements with the class <code>"col-xs-6"</code>
-    testString: 'assert($("div.col-xs-6").not(":has(>div.well)").length < 1, "Add a <code>div</code> element with the class <code>well</code> inside each of your <code>div</code> elements with the class <code>"col-xs-6"</code>");'
+    testString: assert($("div.col-xs-6").not(":has(>div.well)").length < 1, 'Add a <code>div</code> element with the class <code>well</code> inside each of your <code>div</code> elements with the class <code>"col-xs-6"</code>');
   - text: Nest both of your <code>div</code> elements with the class <code>"col-xs-6"</code> within your <code>div</code> element with the class <code>"row"</code>.
-    testString: 'assert($("div.row > div.col-xs-6").length > 1, "Nest both of your <code>div</code> elements with the class <code>"col-xs-6"</code> within your <code>div</code> element with the class <code>"row"</code>.");'
+    testString: assert($("div.row > div.col-xs-6").length > 1, 'Nest both of your <code>div</code> elements with the class <code>"col-xs-6"</code> within your <code>div</code> element with the class <code>"row"</code>.');
   - text: Make sure all your <code>div</code> elements have closing tags.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure all your <code>div</code> elements have closing tags.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure all your <code>div</code> elements have closing tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md
index aa99500a43..77293f6f2c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/ditch-custom-css-for-bootstrap.english.md
@@ -24,15 +24,15 @@ Finally, remove the "smaller-image" class from your first <code>img</code> eleme
 ```yml
 tests:
   - text: Your h2 element should no longer have the class <code>red-text</code>.
-    testString: 'assert(!$("h2").hasClass("red-text"), "Your h2 element should no longer have the class <code>red-text</code>.");'
+    testString: assert(!$("h2").hasClass("red-text"), 'Your h2 element should no longer have the class <code>red-text</code>.');
   - text: Your h2 element should now have the class <code>text-primary</code>.
-    testString: 'assert($("h2").hasClass("text-primary"), "Your h2 element should now have the class <code>text-primary</code>.");'
+    testString: assert($("h2").hasClass("text-primary"), 'Your h2 element should now have the class <code>text-primary</code>.');
   - text: Your paragraph elements should no longer use the font <code>Monospace</code>.
-    testString: 'assert(!$("p").css("font-family").match(/monospace/i), "Your paragraph elements should no longer use the font <code>Monospace</code>.");'
+    testString: assert(!$("p").css("font-family").match(/monospace/i), 'Your paragraph elements should no longer use the font <code>Monospace</code>.');
   - text: Remove the <code>smaller-image</code> class from your top image.
-    testString: 'assert(!$("img").hasClass("smaller-image"), "Remove the <code>smaller-image</code> class from your top image.");'
+    testString: assert(!$("img").hasClass("smaller-image"), 'Remove the <code>smaller-image</code> class from your top image.');
   - text: Add the <code>img-responsive</code> class to your top image.
-    testString: 'assert($(".img-responsive").length > 1, "Add the <code>img-responsive</code> class to your top image.");'
+    testString: assert($(".img-responsive").length > 1, 'Add the <code>img-responsive</code> class to your top image.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/give-each-element-a-unique-id.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/give-each-element-a-unique-id.english.md
index 3ab7528d23..28f444d574 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/give-each-element-a-unique-id.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/give-each-element-a-unique-id.english.md
@@ -22,17 +22,17 @@ Make sure that <code>target1</code> to <code>target3</code> are in <code>#left-w
 ```yml
 tests:
   - text: One <code>button</code> element should have the id <code>target1</code>.
-    testString: 'assert($("#left-well").children("#target1") && $("#left-well").children("#target1").length > 0, "One <code>button</code> element should have the id <code>target1</code>.");'
+    testString: assert($("#left-well").children("#target1") && $("#left-well").children("#target1").length > 0, 'One <code>button</code> element should have the id <code>target1</code>.');
   - text: One <code>button</code> element should have the id <code>target2</code>.
-    testString: 'assert($("#left-well").children("#target2") && $("#left-well").children("#target2").length > 0, "One <code>button</code> element should have the id <code>target2</code>.");'
+    testString: assert($("#left-well").children("#target2") && $("#left-well").children("#target2").length > 0, 'One <code>button</code> element should have the id <code>target2</code>.');
   - text: One <code>button</code> element should have the id <code>target3</code>.
-    testString: 'assert($("#left-well").children("#target3") && $("#left-well").children("#target3").length > 0, "One <code>button</code> element should have the id <code>target3</code>.");'
+    testString: assert($("#left-well").children("#target3") && $("#left-well").children("#target3").length > 0, 'One <code>button</code> element should have the id <code>target3</code>.');
   - text: One <code>button</code> element should have the id <code>target4</code>.
-    testString: 'assert($("#right-well").children("#target4") && $("#right-well").children("#target4").length > 0, "One <code>button</code> element should have the id <code>target4</code>.");'
+    testString: assert($("#right-well").children("#target4") && $("#right-well").children("#target4").length > 0, 'One <code>button</code> element should have the id <code>target4</code>.');
   - text: One <code>button</code> element should have the id <code>target5</code>.
-    testString: 'assert($("#right-well").children("#target5") && $("#right-well").children("#target5").length > 0, "One <code>button</code> element should have the id <code>target5</code>.");'
+    testString: assert($("#right-well").children("#target5") && $("#right-well").children("#target5").length > 0, 'One <code>button</code> element should have the id <code>target5</code>.');
   - text: One <code>button</code> element should have the id <code>target6</code>.
-    testString: 'assert($("#right-well").children("#target6") && $("#right-well").children("#target6").length > 0, "One <code>button</code> element should have the id <code>target6</code>.");'
+    testString: assert($("#right-well").children("#target6") && $("#right-well").children("#target6").length > 0, 'One <code>button</code> element should have the id <code>target6</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/house-our-page-within-a-bootstrap-container-fluid-div.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/house-our-page-within-a-bootstrap-container-fluid-div.english.md
index 22223b373e..1c3754e59e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/house-our-page-within-a-bootstrap-container-fluid-div.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/house-our-page-within-a-bootstrap-container-fluid-div.english.md
@@ -21,11 +21,11 @@ Let's nest your <code>h3</code> element within a <code>div</code> element with t
 ```yml
 tests:
   - text: Your <code>div</code> element should have the class <code>container-fluid</code>.
-    testString: 'assert($("div").hasClass("container-fluid"), "Your <code>div</code> element should have the class <code>container-fluid</code>.");'
+    testString: assert($("div").hasClass("container-fluid"), 'Your <code>div</code> element should have the class <code>container-fluid</code>.');
   - text: Make sure each of your <code>div</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure each of your <code>div</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure each of your <code>div</code> elements has a closing tag.');
   - text: Nest your <code>h3</code> element inside a <code>div</code> element.
-    testString: 'assert($("div").children("h3").length >0, "Nest your <code>h3</code> element inside a <code>div</code> element.");'
+    testString: assert($("div").children("h3").length >0, 'Nest your <code>h3</code> element inside a <code>div</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-buttons.english.md
index 85452c8bcc..b35d1342c8 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-buttons.english.md
@@ -20,18 +20,18 @@ Give each of your <code>button</code> elements text that corresponds to its <cod
 
 ```yml
 tests:
-  - text: 'Give your <code>button</code> element with the id <code>target1</code> the text <code>#target1</code>.'
-    testString: 'assert(new RegExp("#target1","gi").test($("#target1").text()), "Give your <code>button</code> element with the id <code>target1</code> the text <code>#target1</code>.");'
-  - text: 'Give your <code>button</code> element with the id <code>target2</code> the text <code>#target2</code>.'
-    testString: 'assert(new RegExp("#target2","gi").test($("#target2").text()), "Give your <code>button</code> element with the id <code>target2</code> the text <code>#target2</code>.");'
-  - text: 'Give your <code>button</code> element with the id <code>target3</code> the text <code>#target3</code>.'
-    testString: 'assert(new RegExp("#target3","gi").test($("#target3").text()), "Give your <code>button</code> element with the id <code>target3</code> the text <code>#target3</code>.");'
-  - text: 'Give your <code>button</code> element with the id <code>target4</code> the text <code>#target4</code>.'
-    testString: 'assert(new RegExp("#target4","gi").test($("#target4").text()), "Give your <code>button</code> element with the id <code>target4</code> the text <code>#target4</code>.");'
-  - text: 'Give your <code>button</code> element with the id <code>target5</code> the text <code>#target5</code>.'
-    testString: 'assert(new RegExp("#target5","gi").test($("#target5").text()), "Give your <code>button</code> element with the id <code>target5</code> the text <code>#target5</code>.");'
-  - text: 'Give your <code>button</code> element with the id <code>target6</code> the text <code>#target6</code>.'
-    testString: 'assert(new RegExp("#target6","gi").test($("#target6").text()), "Give your <code>button</code> element with the id <code>target6</code> the text <code>#target6</code>.");'
+  - text: Give your <code>button</code> element with the id <code>target1</code> the text <code>#target1</code>.
+    testString: assert(new RegExp("#target1","gi").test($("#target1").text()), 'Give your <code>button</code> element with the id <code>target1</code> the text <code>#target1</code>.');
+  - text: Give your <code>button</code> element with the id <code>target2</code> the text <code>#target2</code>.
+    testString: assert(new RegExp("#target2","gi").test($("#target2").text()), 'Give your <code>button</code> element with the id <code>target2</code> the text <code>#target2</code>.');
+  - text: Give your <code>button</code> element with the id <code>target3</code> the text <code>#target3</code>.
+    testString: assert(new RegExp("#target3","gi").test($("#target3").text()), 'Give your <code>button</code> element with the id <code>target3</code> the text <code>#target3</code>.');
+  - text: Give your <code>button</code> element with the id <code>target4</code> the text <code>#target4</code>.
+    testString: assert(new RegExp("#target4","gi").test($("#target4").text()), 'Give your <code>button</code> element with the id <code>target4</code> the text <code>#target4</code>.');
+  - text: Give your <code>button</code> element with the id <code>target5</code> the text <code>#target5</code>.
+    testString: assert(new RegExp("#target5","gi").test($("#target5").text()), 'Give your <code>button</code> element with the id <code>target5</code> the text <code>#target5</code>.');
+  - text: Give your <code>button</code> element with the id <code>target6</code> the text <code>#target6</code>.
+    testString: assert(new RegExp("#target6","gi").test($("#target6").text()), 'Give your <code>button</code> element with the id <code>target6</code> the text <code>#target6</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-wells.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-wells.english.md
index ddfe84ceb5..1881882eca 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-wells.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/label-bootstrap-wells.english.md
@@ -21,14 +21,14 @@ Above your right-well, inside its <code>col-xs-6</code> <code>div</code> element
 
 ```yml
 tests:
-  - text: 'Add an <code>h4</code> element to each of your <code>&#60;div class="col-xs-6"&#62;</code> elements.'
-    testString: 'assert($(".col-xs-6").children("h4") && $(".col-xs-6").children("h4").length > 1, "Add an <code>h4</code> element to each of your <code>&#60;div class="col-xs-6"&#62;</code> elements.");'
-  - text: 'One <code>h4</code> element should have the text <code>#left-well</code>.'
-    testString: 'assert(new RegExp("#left-well","gi").test($("h4").text()), "One <code>h4</code> element should have the text <code>#left-well</code>.");'
-  - text: 'One <code>h4</code> element should have the text <code>#right-well</code>.'
-    testString: 'assert(new RegExp("#right-well","gi").test($("h4").text()), "One <code>h4</code> element should have the text <code>#right-well</code>.");'
+  - text: Add an <code>h4</code> element to each of your <code>&#60;div class="col-xs-6"&#62;</code> elements.
+    testString: assert($(".col-xs-6").children("h4") && $(".col-xs-6").children("h4").length > 1, 'Add an <code>h4</code> element to each of your <code>&#60;div class="col-xs-6"&#62;</code> elements.');
+  - text: One <code>h4</code> element should have the text <code>#left-well</code>.
+    testString: assert(new RegExp("#left-well","gi").test($("h4").text()), 'One <code>h4</code> element should have the text <code>#left-well</code>.');
+  - text: One <code>h4</code> element should have the text <code>#right-well</code>.
+    testString: assert(new RegExp("#right-well","gi").test($("h4").text()), 'One <code>h4</code> element should have the text <code>#right-well</code>.');
   - text: Make sure all your <code>h4</code> elements have closing tags.
-    testString: 'assert(code.match(/<\/h4>/g) && code.match(/<h4/g) && code.match(/<\/h4>/g).length === code.match(/<h4/g).length, "Make sure all your <code>h4</code> elements have closing tags.");'
+    testString: assert(code.match(/<\/h4>/g) && code.match(/<h4/g) && code.match(/<\/h4>/g).length === code.match(/<h4/g).length, 'Make sure all your <code>h4</code> elements have closing tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md
index 53babcef09..4d4c8871aa 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/line-up-form-elements-responsively-with-bootstrap.english.md
@@ -25,13 +25,13 @@ This is the last challenge we'll do for our Cat Photo App for now. We hope you'v
 ```yml
 tests:
   - text: Nest your form submission button and text input in a div with class <code>row</code>.
-    testString: 'assert($("div.row:has(input[type=\"text\"])").length > 0 &&  $("div.row:has(button[type=\"submit\"])").length > 0, "Nest your form submission button and text input in a div with class <code>row</code>.");'
+    testString: assert($("div.row:has(input[type=\"text\"])").length > 0 &&  $("div.row:has(button[type=\"submit\"])").length > 0, 'Nest your form submission button and text input in a div with class <code>row</code>.');
   - text: Nest your form text input in a div with the class <code>col-xs-7</code>.
-    testString: 'assert($("div.col-xs-7:has(input[type=\"text\"])").length > 0, "Nest your form text input in a div with the class <code>col-xs-7</code>.");'
+    testString: assert($("div.col-xs-7:has(input[type=\"text\"])").length > 0, 'Nest your form text input in a div with the class <code>col-xs-7</code>.');
   - text: Nest your form submission button in a div with the class <code>col-xs-5</code>.
-    testString: 'assert($("div.col-xs-5:has(button[type=\"submit\"])").length > 0, "Nest your form submission button in a div with the class <code>col-xs-5</code>.");'
+    testString: assert($("div.col-xs-5:has(button[type=\"submit\"])").length > 0, 'Nest your form submission button in a div with the class <code>col-xs-5</code>.');
   - text: Make sure each of your <code>div</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure each of your <code>div</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure each of your <code>div</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md
index 095894a941..e1ed0fda6e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/make-images-mobile-responsive.english.md
@@ -22,15 +22,15 @@ Fortunately, with Bootstrap, all we need to do is add the <code>img-responsive</
 ```yml
 tests:
   - text: You should have a total of two images.
-    testString: 'assert($("img").length === 2, "You should have a total of two images.");'
+    testString: assert($("img").length === 2, 'You should have a total of two images.');
   - text: Your new image should be below your old one and have the class <code>img-responsive</code>.
-    testString: 'assert($("img:eq(1)").hasClass("img-responsive"), "Your new image should be below your old one and have the class <code>img-responsive</code>.");'
+    testString: assert($("img:eq(1)").hasClass("img-responsive"), 'Your new image should be below your old one and have the class <code>img-responsive</code>.');
   - text: Your new image should not have the class <code>smaller-image</code>.
-    testString: 'assert(!$("img:eq(1)").hasClass("smaller-image"), "Your new image should not have the class <code>smaller-image</code>.");'
-  - text: 'Your new image should have a <code>src</code> of <code>https&#58;//bit.ly/fcc-running-cats</code>.'
-    testString: 'assert($("img:eq(1)").attr("src") === "https://bit.ly/fcc-running-cats", "Your new image should have a <code>src</code> of <code>https&#58;//bit.ly/fcc-running-cats</code>.");'
+    testString: assert(!$("img:eq(1)").hasClass("smaller-image"), 'Your new image should not have the class <code>smaller-image</code>.');
+  - text: Your new image should have a <code>src</code> of <code>https&#58;//bit.ly/fcc-running-cats</code>.
+    testString: assert($("img:eq(1)").attr("src") === "https://bit.ly/fcc-running-cats", 'Your new image should have a <code>src</code> of <code>https&#58;//bit.ly/fcc-running-cats</code>.');
   - text: Make sure your new <code>img</code> element has a closing angle bracket.
-    testString: 'assert(code.match(/<img/g) && code.match(/<img[^<]*>/g).length === 2 && code.match(/<img/g).length === 2, "Make sure your new <code>img</code> element has a closing angle bracket.");'
+    testString: assert(code.match(/<img/g) && code.match(/<img[^<]*>/g).length === 2 && code.match(/<img/g).length === 2, 'Make sure your new <code>img</code> element has a closing angle bracket.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md
index fffad5770c..88bc90391b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-checkboxes.english.md
@@ -24,11 +24,11 @@ Nest all three of your checkboxes in a <code>&#60;div class="row"&#62;</code> el
 ```yml
 tests:
   - text: Nest all of your checkboxes inside one <code>div</code> with the class <code>row</code>.
-    testString: 'assert($("div.row:has(input[type=\"checkbox\"])").length > 0, "Nest all of your checkboxes inside one <code>div</code> with the class <code>row</code>.");'
+    testString: assert($("div.row:has(input[type=\"checkbox\"])").length > 0, 'Nest all of your checkboxes inside one <code>div</code> with the class <code>row</code>.');
   - text: Nest each of your checkboxes inside its own <code>div</code> with the class <code>col-xs-4</code>.
-    testString: 'assert($("div.col-xs-4:has(input[type=\"checkbox\"])").length > 2, "Nest each of your checkboxes inside its own <code>div</code> with the class <code>col-xs-4</code>.");'
+    testString: assert($("div.col-xs-4:has(input[type=\"checkbox\"])").length > 2, 'Nest each of your checkboxes inside its own <code>div</code> with the class <code>col-xs-4</code>.');
   - text: Make sure each of your <code>div</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure each of your <code>div</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure each of your <code>div</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md
index 8d9ff258ae..46e14477a6 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/responsively-style-radio-buttons.english.md
@@ -25,11 +25,11 @@ Nest both your radio buttons within a <code>&#60;div class="row"&#62;</code> ele
 ```yml
 tests:
   - text: Nest all of your radio buttons inside one <code>div</code> with the class <code>row</code>.
-    testString: 'assert($("div.row:has(input[type=\"radio\"])").length > 0, "Nest all of your radio buttons inside one <code>div</code> with the class <code>row</code>.");'
+    testString: assert($("div.row:has(input[type=\"radio\"])").length > 0, 'Nest all of your radio buttons inside one <code>div</code> with the class <code>row</code>.');
   - text: Nest each of your radio buttons inside its own <code>div</code> with the class <code>col-xs-6</code>.
-    testString: 'assert($("div.col-xs-6:has(input[type=\"radio\"])").length > 1, "Nest each of your radio buttons inside its own <code>div</code> with the class <code>col-xs-6</code>.");'
+    testString: assert($("div.col-xs-6:has(input[type=\"radio\"])").length > 1, 'Nest each of your radio buttons inside its own <code>div</code> with the class <code>col-xs-6</code>.');
   - text: Make sure each of your <code>div</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure each of your <code>div</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure each of your <code>div</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/split-your-bootstrap-row.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/split-your-bootstrap-row.english.md
index b2768b58b1..95e52d0cd7 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/split-your-bootstrap-row.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/split-your-bootstrap-row.english.md
@@ -21,9 +21,9 @@ Create two <code>div</code> elements within your row, both with the class <code>
 ```yml
 tests:
   - text: Nest two <code>div class="col-xs-6"</code> elements within your <code>div class="row"</code> element.
-    testString: 'assert($("div.row > div.col-xs-6").length > 1, "Nest two <code>div class="col-xs-6"</code> elements within your <code>div class="row"</code> element.");'
+    testString: assert($("div.row > div.col-xs-6").length > 1, 'Nest two <code>div class="col-xs-6"</code> elements within your <code>div class="row"</code> element.');
   - text: Make sure all your <code>div</code> elements have closing tags.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure all your <code>div</code> elements have closing tags.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure all your <code>div</code> elements have closing tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md
index acba3dc9c9..de27021af0 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/style-text-inputs-as-form-controls.english.md
@@ -25,13 +25,13 @@ All textual <code>&lt;input&gt;</code>, <code>&lt;textarea&gt;</code>, and <code
 ```yml
 tests:
   - text: Give the submit button in your form the classes <code>btn btn-primary</code>.
-    testString: 'assert($("button[type=\"submit\"]").hasClass("btn btn-primary"), "Give the submit button in your form the classes <code>btn btn-primary</code>.");'
-  - text: 'Add a <code>&#60;i class="fa fa-paper-plane"&#62;&#60;/i&#62;</code> within your submit <code>button</code> element.'
-    testString: 'assert($("button[type=\"submit\"]:has(i.fa.fa-paper-plane)").length > 0, "Add a <code>&#60;i class="fa fa-paper-plane"&#62;&#60;/i&#62;</code> within your submit <code>button</code> element.");'
+    testString: assert($("button[type=\"submit\"]").hasClass("btn btn-primary"), 'Give the submit button in your form the classes <code>btn btn-primary</code>.');
+  - text: Add a <code>&#60;i class="fa fa-paper-plane"&#62;&#60;/i&#62;</code> within your submit <code>button</code> element.
+    testString: assert($("button[type=\"submit\"]:has(i.fa.fa-paper-plane)").length > 0, 'Add a <code>&#60;i class="fa fa-paper-plane"&#62;&#60;/i&#62;</code> within your submit <code>button</code> element.');
   - text: Give the text <code>input</code> in your form the class <code>form-control</code>.
-    testString: 'assert($("input[type=\"text\"]").hasClass("form-control"), "Give the text <code>input</code> in your form the class <code>form-control</code>.");'
+    testString: assert($("input[type=\"text\"]").hasClass("form-control"), 'Give the text <code>input</code> in your form the class <code>form-control</code>.');
   - text: Make sure each of your <code>i</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/i>/g) && code.match(/<\/i/g).length > 3, "Make sure each of your <code>i</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/i>/g) && code.match(/<\/i/g).length > 3, 'Make sure each of your <code>i</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md
index 99d88f4ae7..82a86b6565 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/taste-the-bootstrap-button-color-rainbow.english.md
@@ -22,11 +22,11 @@ Note that this button will still need the <code>btn</code> and <code>btn-block</
 ```yml
 tests:
   - text: Your button should have the class <code>btn-primary</code>.
-    testString: 'assert($("button").hasClass("btn-primary"), "Your button should have the class <code>btn-primary</code>.");'
+    testString: assert($("button").hasClass("btn-primary"), 'Your button should have the class <code>btn-primary</code>.');
   - text: Your button should still have the <code>btn</code> and <code>btn-block</code> classes.
-    testString: 'assert($("button").hasClass("btn-block") && $("button").hasClass("btn"), "Your button should still have the <code>btn</code> and <code>btn-block</code> classes.");'
+    testString: assert($("button").hasClass("btn-block") && $("button").hasClass("btn"), 'Your button should still have the <code>btn</code> and <code>btn-block</code> classes.');
   - text: Make sure all your <code>button</code> elements have a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure all your <code>button</code> elements have a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure all your <code>button</code> elements have a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md
index 5fad780ee3..e44f861c45 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-a-span-to-target-inline-elements.english.md
@@ -27,13 +27,13 @@ Here's how you would do this with the "Top 3 things cats hate" element:
 ```yml
 tests:
   - text: Your <code>span</code> element should be inside your <code>p</code> element.
-    testString: 'assert($("p span") && $("p span").length > 0, "Your <code>span</code> element should be inside your <code>p</code> element.");'
+    testString: assert($("p span") && $("p span").length > 0, 'Your <code>span</code> element should be inside your <code>p</code> element.');
   - text: Your <code>span</code> element should have just the text <code>love</code>.
-    testString: 'assert($("p span") && $("p span").text().match(/love/i) && !$("p span").text().match(/Things cats/i), "Your <code>span</code> element should have just the text <code>love</code>.");'
+    testString: assert($("p span") && $("p span").text().match(/love/i) && !$("p span").text().match(/Things cats/i), 'Your <code>span</code> element should have just the text <code>love</code>.');
   - text: Your <code>span</code> element should have class <code>text-danger</code>.
-    testString: 'assert($("span").hasClass("text-danger"), "Your <code>span</code> element should have class <code>text-danger</code>.");'
+    testString: assert($("span").hasClass("text-danger"), 'Your <code>span</code> element should have class <code>text-danger</code>.');
   - text: Make sure your <code>span</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/span>/g) && code.match(/<span/g) && code.match(/<\/span>/g).length === code.match(/<span/g).length, "Make sure your <code>span</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/span>/g) && code.match(/<span/g) && code.match(/<\/span>/g).length === code.match(/<span/g).length, 'Make sure your <code>span</code> element has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-comments-to-clarify-code.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-comments-to-clarify-code.english.md
index 5fceafe330..a0b925f782 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-comments-to-clarify-code.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-comments-to-clarify-code.english.md
@@ -22,14 +22,14 @@ Add a comment at the top of your HTML that says <code>Only change code above thi
 
 ```yml
 tests:
-  - text: 'Start a comment with <code>&#60;!--</code> at the top of your HTML.'
-    testString: 'assert(code.match(/^\s*<!--/), "Start a comment with <code>&#60;!--</code> at the top of your HTML.");'
+  - text: Start a comment with <code>&#60;!--</code> at the top of your HTML.
+    testString: assert(code.match(/^\s*<!--/), 'Start a comment with <code>&#60;!--</code> at the top of your HTML.');
   - text: Your comment should have the text <code>Only change code above this line</code>.
-    testString: 'assert(code.match(/<!--(?!(>|->|.*-->.*this line))\s*.*this line.*\s*-->/gi), "Your comment should have the text <code>Only change code above this line</code>.");'
-  - text: 'Be sure to close your comment with <code>--&#62;</code>.'
-    testString: 'assert(code.match(/-->.*\n+.+/g), "Be sure to close your comment with <code>--&#62;</code>.");'
+    testString: assert(code.match(/<!--(?!(>|->|.*-->.*this line))\s*.*this line.*\s*-->/gi), 'Your comment should have the text <code>Only change code above this line</code>.');
+  - text: Be sure to close your comment with <code>--&#62;</code>.
+    testString: assert(code.match(/-->.*\n+.+/g), 'Be sure to close your comment with <code>--&#62;</code>.');
   - text: You should have the same number of comment openers and closers.
-    testString: 'assert(code.match(/<!--/g).length === code.match(/-->/g).length, "You should have the same number of comment openers and closers.");'
+    testString: assert(code.match(/<!--/g).length === code.match(/-->/g).length, 'You should have the same number of comment openers and closers.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md
index 30f6c6c8b7..a4832cdfd4 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-responsive-design-with-bootstrap-fluid-containers.english.md
@@ -26,11 +26,11 @@ To get started, we should nest all of our HTML (except the <code>link</code> tag
 ```yml
 tests:
   - text: Your <code>div</code> element should have the class <code>container-fluid</code>.
-    testString: 'assert($("div").hasClass("container-fluid"), "Your <code>div</code> element should have the class <code>container-fluid</code>.");'
+    testString: assert($("div").hasClass("container-fluid"), 'Your <code>div</code> element should have the class <code>container-fluid</code>.');
   - text: Make sure your <code>div</code> element has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure your <code>div</code> element has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure your <code>div</code> element has a closing tag.');
   - text: Make sure you have nested all HTML elements after the closing <code>style</code> tag in <code>.container-fluid</code>.
-    testString: 'assert($(".container-fluid").children().length >= 8, "Make sure you have nested all HTML elements after the closing <code>style</code> tag in <code>.container-fluid</code>.");'
+    testString: assert($(".container-fluid").children().length >= 8, 'Make sure you have nested all HTML elements after the closing <code>style</code> tag in <code>.container-fluid</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md
index 0058ae1339..2acd292cf0 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/use-the-bootstrap-grid-to-put-elements-side-by-side.english.md
@@ -25,13 +25,13 @@ The <code>row</code> class is applied to a <code>div</code>, and the buttons the
 ```yml
 tests:
   - text: Your buttons should all be nested within the same <code>div</code> element with the class <code>row</code>.
-    testString: 'assert($("div.row:has(button)").length > 0, "Your buttons should all be nested within the same <code>div</code> element with the class <code>row</code>.");'
+    testString: assert($("div.row:has(button)").length > 0, 'Your buttons should all be nested within the same <code>div</code> element with the class <code>row</code>.');
   - text: Each of your Bootstrap buttons should be nested within its own <code>div</code> element with the class <code>col-xs-4</code>.
-    testString: 'assert($("div.col-xs-4:has(button)").length > 2, "Each of your Bootstrap buttons should be nested within its own <code>div</code> element with the class <code>col-xs-4</code>.");'
+    testString: assert($("div.col-xs-4:has(button)").length > 2, 'Each of your Bootstrap buttons should be nested within its own <code>div</code> element with the class <code>col-xs-4</code>.');
   - text: Make sure each of your <code>button</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure each of your <code>button</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure each of your <code>button</code> elements has a closing tag.');
   - text: Make sure each of your <code>div</code> elements has a closing tag.
-    testString: 'assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, "Make sure each of your <code>div</code> elements has a closing tag.");'
+    testString: assert(code.match(/<\/div>/g) && code.match(/<div/g) && code.match(/<\/div>/g).length === code.match(/<div/g).length, 'Make sure each of your <code>div</code> elements has a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md b/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md
index 5b183d007c..bdde82947f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/bootstrap/warn-your-users-of-a-dangerous-action-with-btn-danger.english.md
@@ -22,13 +22,13 @@ Note that these buttons still need the <code>btn</code> and <code>btn-block</cod
 ```yml
 tests:
   - text: Create a new <code>button</code> element with the text "Delete".
-    testString: 'assert(new RegExp("Delete","gi").test($("button").text()), "Create a new <code>button</code> element with the text "Delete".");'
+    testString: assert(new RegExp("Delete","gi").test($("button").text()), 'Create a new <code>button</code> element with the text "Delete".');
   - text: All of your Bootstrap buttons should have the <code>btn</code> and <code>btn-block</code> classes.
-    testString: 'assert($("button.btn-block.btn").length > 2, "All of your Bootstrap buttons should have the <code>btn</code> and <code>btn-block</code> classes.");'
+    testString: assert($("button.btn-block.btn").length > 2, 'All of your Bootstrap buttons should have the <code>btn</code> and <code>btn-block</code> classes.');
   - text: Your new button should have the class <code>btn-danger</code>.
-    testString: 'assert($("button").hasClass("btn-danger"), "Your new button should have the class <code>btn-danger</code>.");'
+    testString: assert($("button").hasClass("btn-danger"), 'Your new button should have the class <code>btn-danger</code>.');
   - text: Make sure all your <code>button</code> elements have a closing tag.
-    testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, "Make sure all your <code>button</code> elements have a closing tag.");'
+    testString: assert(code.match(/<\/button>/g) && code.match(/<button/g) && code.match(/<\/button>/g).length === code.match(/<button/g).length, 'Make sure all your <code>button</code> elements have a closing tag.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/change-text-inside-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/change-text-inside-an-element-using-jquery.english.md
index 2d5a13b345..36543ced85 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/change-text-inside-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/change-text-inside-an-element-using-jquery.english.md
@@ -27,15 +27,15 @@ Note that while the <code>&#60;i&#62;</code> tag has traditionally been used to
 ```yml
 tests:
   - text: Emphasize the text in your <code>target4</code> button by adding HTML tags.
-    testString: 'assert.isTrue((/<em>|<i>\s*#target4\s*<\/em>|<\/i>/gi).test($("#target4").html()), "Emphasize the text in your <code>target4</code> button by adding HTML tags.");'
+    testString: assert.isTrue((/<em>|<i>\s*#target4\s*<\/em>|<\/i>/gi).test($("#target4").html()), 'Emphasize the text in your <code>target4</code> button by adding HTML tags.');
   - text: Make sure the text is otherwise unchanged.
-    testString: 'assert($("#target4") && $("#target4").text().trim() === "#target4", "Make sure the text is otherwise unchanged.");'
+    testString: assert($("#target4") && $("#target4").text().trim() === '#target4', 'Make sure the text is otherwise unchanged.');
   - text: Do not alter any other text.
-    testString: 'assert.isFalse((/<em>|<i>/gi).test($("h3").html()), "Do not alter any other text.");'
+    testString: assert.isFalse((/<em>|<i>/gi).test($("h3").html()), 'Do not alter any other text.');
   - text: Make sure you are using <code>.html()</code> and not <code>.text()</code>.
-    testString: 'assert(code.match(/\.html\(/g), "Make sure you are using <code>.html()</code> and not <code>.text()</code>.");'
+    testString: assert(code.match(/\.html\(/g), 'Make sure you are using <code>.html()</code> and not <code>.text()</code>.');
   - text: Make sure to select <code>button id="target4"</code> with jQuery.
-    testString: 'assert(code.match(/\$\(\s*?(\"|\")#target4(\"|\")\s*?\)\.html\(/), "Make sure to select <code>button id="target4"</code> with jQuery.");'
+    testString: assert(code.match(/\$\(\s*?(\"|\')#target4(\"|\')\s*?\)\.html\(/), 'Make sure to select <code>button id="target4"</code> with jQuery.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/change-the-css-of-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/change-the-css-of-an-element-using-jquery.english.md
index 1d16800cf1..a924d25f53 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/change-the-css-of-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/change-the-css-of-an-element-using-jquery.english.md
@@ -28,9 +28,9 @@ Select <code>target1</code> and change its color to red.
 ```yml
 tests:
   - text: Your <code>target1</code> element should have red text.
-    testString: 'assert($("#target1").css("color") === "rgb(255, 0, 0)", "Your <code>target1</code> element should have red text.");'
+    testString: assert($("#target1").css("color") === 'rgb(255, 0, 0)', 'Your <code>target1</code> element should have red text.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(!code.match(/class.*animated/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(!code.match(/class.*animated/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/clone-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/clone-an-element-using-jquery.english.md
index c5b7a8e1f7..ce8b4c7785 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/clone-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/clone-an-element-using-jquery.english.md
@@ -25,11 +25,11 @@ Clone your <code>target5</code> element and append it to your <code>left-well</c
 ```yml
 tests:
   - text: Your <code>target5</code> element should be inside your <code>right-well</code>.
-    testString: 'assert($("#right-well").children("#target5").length > 0, "Your <code>target5</code> element should be inside your <code>right-well</code>.");'
+    testString: assert($("#right-well").children("#target5").length > 0, 'Your <code>target5</code> element should be inside your <code>right-well</code>.');
   - text: A copy of your <code>target5</code> element should also be inside your <code>left-well</code>.
-    testString: 'assert($("#left-well").children("#target5").length > 0, "A copy of your <code>target5</code> element should also be inside your <code>left-well</code>.");'
+    testString: assert($("#left-well").children("#target5").length > 0, 'A copy of your <code>target5</code> element should also be inside your <code>left-well</code>.');
   - text: Only use jQuery to move these elements.
-    testString: 'assert(!code.match(/class.*animated/g), "Only use jQuery to move these elements.");'
+    testString: assert(!code.match(/class.*animated/g), 'Only use jQuery to move these elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/delete-your-jquery-functions.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/delete-your-jquery-functions.english.md
index b63367dcfc..bc0fec6536 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/delete-your-jquery-functions.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/delete-your-jquery-functions.english.md
@@ -23,15 +23,15 @@ Delete all three of these jQuery functions from your <code>document ready functi
 ```yml
 tests:
   - text: Delete all three of your jQuery functions from your <code>document ready function</code>.
-    testString: 'assert(code.match(/\{\s*\}\);/g), "Delete all three of your jQuery functions from your <code>document ready function</code>.");'
+    testString: assert(code.match(/\{\s*\}\);/g), 'Delete all three of your jQuery functions from your <code>document ready function</code>.');
   - text: Leave your <code>script</code> element intact.
-    testString: 'assert(code.match(/<script>/g), "Leave your <code>script</code> element intact.");'
-  - text: 'Leave your <code>$&#40document&#41.ready&#40function&#40&#41 {</code> to the beginning of your <code>script</code> element.'
-    testString: 'assert(code.match(/\$\(document\)\.ready\(function\(\)\s?\{/g), "Leave your <code>$&#40document&#41.ready&#40function&#40&#41 {</code> to the beginning of your <code>script</code> element.");'
-  - text: 'Leave your "document ready function" closing <code>&#125;&#41;</code> intact.'
-    testString: 'assert(code.match(/.*\s*\}\);/g), "Leave your "document ready function" closing <code>&#125;&#41;</code> intact.");'
+    testString: assert(code.match(/<script>/g), 'Leave your <code>script</code> element intact.');
+  - text: Leave your <code>$&#40document&#41.ready&#40function&#40&#41 {</code> to the beginning of your <code>script</code> element.
+    testString: assert(code.match(/\$\(document\)\.ready\(function\(\)\s?\{/g), 'Leave your <code>$&#40document&#41.ready&#40function&#40&#41 {</code> to the beginning of your <code>script</code> element.');
+  - text: Leave your "document ready function" closing <code>&#125;&#41;</code> intact.
+    testString: assert(code.match(/.*\s*\}\);/g), 'Leave your "document ready function" closing <code>&#125;&#41;</code> intact.');
   - text: Leave your <code>script</code> element closing tag intact.
-    testString: 'assert(code.match(/<\/script>/g) && code.match(/<script/g) && code.match(/<\/script>/g).length === code.match(/<script/g).length, "Leave your <code>script</code> element closing tag intact.");'
+    testString: assert(code.match(/<\/script>/g) && code.match(/<script/g) && code.match(/<\/script>/g).length === code.match(/<script/g).length, 'Leave your <code>script</code> element closing tag intact.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/disable-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/disable-an-element-using-jquery.english.md
index 0eade5a4d1..1407a13970 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/disable-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/disable-an-element-using-jquery.english.md
@@ -25,11 +25,11 @@ Disable only the <code>target1</code> button.
 ```yml
 tests:
   - text: Disable your <code>target1</code> button.
-    testString: 'assert($("#target1") && $("#target1").prop("disabled") && code.match(/[""]disabled[""],( true|true)/g), "Disable your <code>target1</code> button.");'
+    testString: assert($("#target1") && $("#target1").prop("disabled") && code.match(/["']disabled["'],( true|true)/g), 'Disable your <code>target1</code> button.');
   - text: Do not disable any other buttons.
-    testString: 'assert($("#target2") && !$("#target2").prop("disabled"), "Do not disable any other buttons.");'
+    testString: assert($("#target2") && !$("#target2").prop("disabled"), 'Do not disable any other buttons.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(!code.match(/disabled[^<]*>/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(!code.match(/disabled[^<]*>/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/remove-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/remove-an-element-using-jquery.english.md
index c67e480157..b587868e81 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/remove-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/remove-an-element-using-jquery.english.md
@@ -22,9 +22,9 @@ Remove element <code>target4</code> from the page by using the <code>.remove()</
 ```yml
 tests:
   - text: Use jQuery to remove your <code>target4</code> element from your page.
-    testString: 'assert($("#target4").length === 0 && code.match(/\$\([""]#target4[""]\).remove\(\)/g), "Use jQuery to remove your <code>target4</code> element from your page.");'
+    testString: assert($("#target4").length === 0 && code.match(/\$\(["']#target4["']\).remove\(\)/g), 'Use jQuery to remove your <code>target4</code> element from your page.');
   - text: Only use jQuery to remove this element.
-    testString: 'assert(code.match(/id="target4/g) && !code.match(/<!--.*id="target4".*-->/g) && $("#right-well").length > 0, "Only use jQuery to remove this element.");'
+    testString: assert(code.match(/id="target4/g) && !code.match(/<!--.*id="target4".*-->/g) && $("#right-well").length > 0, 'Only use jQuery to remove this element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/remove-classes-from-an-element-with-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/remove-classes-from-an-element-with-jquery.english.md
index b56457237b..a23f3db4ff 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/remove-classes-from-an-element-with-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/remove-classes-from-an-element-with-jquery.english.md
@@ -25,11 +25,11 @@ Let's remove the <code>btn-default</code> class from all of our <code>button</co
 ```yml
 tests:
   - text: Remove the <code>btn-default</code> class from all of your <code>button</code> elements.
-    testString: 'assert($(".btn-default").length === 0, "Remove the <code>btn-default</code> class from all of your <code>button</code> elements.");'
+    testString: assert($(".btn-default").length === 0, 'Remove the <code>btn-default</code> class from all of your <code>button</code> elements.');
   - text: Only use jQuery to remove this class from the element.
-    testString: 'assert(code.match(/btn btn-default/g), "Only use jQuery to remove this class from the element.");'
+    testString: assert(code.match(/btn btn-default/g), 'Only use jQuery to remove this class from the element.');
   - text: Only remove the <code>btn-default</code> class.
-    testString: 'assert(code.match(/\.[\v\s]*removeClass[\s\v]*\([\s\v]*("|")\s*btn-default\s*("|")[\s\v]*\)/gm), "Only remove the <code>btn-default</code> class.");'
+    testString: assert(code.match(/\.[\v\s]*removeClass[\s\v]*\([\s\v]*('|")\s*btn-default\s*('|")[\s\v]*\)/gm), 'Only remove the <code>btn-default</code> class.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-a-specific-child-of-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-a-specific-child-of-an-element-using-jquery.english.md
index efd00bfb51..52abb964a7 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-a-specific-child-of-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-a-specific-child-of-an-element-using-jquery.english.md
@@ -27,13 +27,13 @@ Make the second child in each of your well elements bounce. You must select the
 ```yml
 tests:
   - text: The second element in your <code>target</code> elements should bounce.
-    testString: 'assert($(".target:nth-child(2)").hasClass("animated") && $(".target:nth-child(2)").hasClass("bounce"), "The second element in your <code>target</code> elements should bounce.");'
+    testString: assert($(".target:nth-child(2)").hasClass("animated") && $(".target:nth-child(2)").hasClass("bounce"), 'The second element in your <code>target</code> elements should bounce.');
   - text: Only two elements should bounce.
-    testString: 'assert($(".animated.bounce").length === 2, "Only two elements should bounce.");'
-  - text: 'You should use the <code>&#58;nth-child&#40&#41</code> selector to modify these elements.'
-    testString: 'assert(code.match(/\:nth-child\(/g), "You should use the <code>&#58;nth-child&#40&#41</code> selector to modify these elements.");'
+    testString: assert($(".animated.bounce").length === 2, 'Only two elements should bounce.');
+  - text: You should use the <code>&#58;nth-child&#40&#41</code> selector to modify these elements.
+    testString: assert(code.match(/\:nth-child\(/g), 'You should use the <code>&#58;nth-child&#40&#41</code> selector to modify these elements.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(code.match(/\$\(".target:nth-child\(2\)"\)/g) || code.match(/\$\(".target:nth-child\(2\)"\)/g) || code.match(/\$\(".target"\).filter\(":nth-child\(2\)"\)/g) || code.match(/\$\(".target"\).filter\(":nth-child\(2\)"\)/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(code.match(/\$\(".target:nth-child\(2\)"\)/g) || code.match(/\$\('.target:nth-child\(2\)'\)/g) || code.match(/\$\(".target"\).filter\(":nth-child\(2\)"\)/g) || code.match(/\$\('.target'\).filter\(':nth-child\(2\)'\)/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-class-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-class-using-jquery.english.md
index 884da4840e..46919b5e9e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-class-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-class-using-jquery.english.md
@@ -27,10 +27,10 @@ For example, you could make all the elements with the class <code>text-primary</
 
 ```yml
 tests:
-  - text: 'Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>shake</code> to all your elements with the class <code>well</code>.'
-    testString: 'assert($(".well").hasClass("animated") && $(".well").hasClass("shake"), "Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>shake</code> to all your elements with the class <code>well</code>.");'
+  - text: Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>shake</code> to all your elements with the class <code>well</code>.
+    testString: assert($(".well").hasClass("animated") && $(".well").hasClass("shake"), 'Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>shake</code> to all your elements with the class <code>well</code>.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(!code.match(/class\.\*animated/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(!code.match(/class\.\*animated/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-id-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-id-using-jquery.english.md
index ef3bd27733..9e85155954 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-id-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-elements-by-id-using-jquery.english.md
@@ -26,12 +26,12 @@ Here's how you'd make the <code>button</code> element with the id <code>target6<
 
 ```yml
 tests:
-  - text: 'Select the <code>button</code> element with the <code>id</code> of <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class of <code>animated</code>.'
-    testString: 'assert($("#target3").hasClass("animated"), "Select the <code>button</code> element with the <code>id</code> of <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class of <code>animated</code>.");'
-  - text: 'Target the element with the id <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class <code>fadeOut</code>.'
-    testString: 'assert(($("#target3").hasClass("fadeOut") || $("#target3").hasClass("fadeout"))  && code.match(/\$\(\s*.#target3.\s*\)/g), "Target the element with the id <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class <code>fadeOut</code>.");'
+  - text: Select the <code>button</code> element with the <code>id</code> of <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class of <code>animated</code>.
+    testString: assert($("#target3").hasClass("animated"), 'Select the <code>button</code> element with the <code>id</code> of <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class of <code>animated</code>.');
+  - text: Target the element with the id <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class <code>fadeOut</code>.
+    testString: assert(($("#target3").hasClass("fadeOut") || $("#target3").hasClass("fadeout"))  && code.match(/\$\(\s*.#target3.\s*\)/g), 'Target the element with the id <code>target3</code> and use the jQuery <code>addClass&#40&#41</code> function to give it the class <code>fadeOut</code>.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(!code.match(/class.*animated/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(!code.match(/class.*animated/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-even-elements-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-even-elements-using-jquery.english.md
index 67c5a3ff40..2ae383adee 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-even-elements-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-even-elements-using-jquery.english.md
@@ -26,11 +26,11 @@ Try selecting all the even <code>target</code> elements and giving them the clas
 ```yml
 tests:
   - text: All of the <code>target</code> elements that jQuery considers to be even should shake.
-    testString: 'assert($(".target:even").hasClass("animated") && $(".target:even").hasClass("shake"), "All of the <code>target</code> elements that jQuery considers to be even should shake.");'
-  - text: 'You should use the <code>&#58;even</code> selector to modify these elements.'
-    testString: 'assert(code.match(/\:even/g), "You should use the <code>&#58;even</code> selector to modify these elements.");'
+    testString: assert($('.target:even').hasClass('animated') && $('.target:even').hasClass('shake'), 'All of the <code>target</code> elements that jQuery considers to be even should shake.');
+  - text: You should use the <code>&#58;even</code> selector to modify these elements.
+    testString: assert(code.match(/\:even/g), 'You should use the <code>&#58;even</code> selector to modify these elements.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(code.match(/\$\(".target:even"\)/g) || code.match(/\$\(".target:even"\)/g) || code.match(/\$\(".target"\).filter\(":even"\)/g) || code.match(/\$\(".target"\).filter\(":even"\)/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(code.match(/\$\(".target:even"\)/g) || code.match(/\$\('.target:even'\)/g) || code.match(/\$\(".target"\).filter\(":even"\)/g) || code.match(/\$\('.target'\).filter\(':even'\)/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-html-elements-with-selectors-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-html-elements-with-selectors-using-jquery.english.md
index a385cec573..3a6fc1a661 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-html-elements-with-selectors-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-html-elements-with-selectors-using-jquery.english.md
@@ -26,12 +26,12 @@ Note that we've already included both the jQuery library and the Animate.css lib
 
 ```yml
 tests:
-  - text: 'Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>bounce</code> to your <code>button</code> elements.'
-    testString: 'assert($("button").hasClass("animated") && $("button").hasClass("bounce"), "Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>bounce</code> to your <code>button</code> elements.");'
+  - text: Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>bounce</code> to your <code>button</code> elements.
+    testString: assert($("button").hasClass("animated") && $("button").hasClass("bounce"), 'Use the jQuery <code>addClass&#40&#41</code> function to give the classes <code>animated</code> and <code>bounce</code> to your <code>button</code> elements.');
   - text: Only use jQuery to add these colors to the element.
-    testString: 'assert(!code.match(/class.*animated/g), "Only use jQuery to add these colors to the element.");'
+    testString: assert(!code.match(/class.*animated/g), 'Only use jQuery to add these colors to the element.');
   - text: Your jQuery code should be within the <code>$(document).ready();</code> function.
-    testString: 'assert(code.match(/\$\(document\)\.ready\(function.*(\s|\n)*.*button.*.addClass.*\);/g), "Your jQuery code should be within the <code>$(document).ready();</code> function.");'
+    testString: assert(code.match(/\$\(document\)\.ready\(function.*(\s|\n)*.*button.*.addClass.*\);/g), 'Your jQuery code should be within the <code>$(document).ready();</code> function.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-children-of-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-children-of-an-element-using-jquery.english.md
index 8412dfa845..5af63b087e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-children-of-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-children-of-an-element-using-jquery.english.md
@@ -22,12 +22,12 @@ Give all the children of your <code>right-well</code> element the color orange.
 
 ```yml
 tests:
-  - text: 'All children of <code>#right-well</code> should have orange text.'
-    testString: 'assert($("#right-well").children().css("color") === "rgb(255, 165, 0)", "All children of <code>#right-well</code> should have orange text.");'
-  - text: 'You should use the <code>children&#40&#41</code> function to modify these elements.'
-    testString: 'assert(code.match(/\.children\(\)\.css/g), "You should use the <code>children&#40&#41</code> function to modify these elements.");'
+  - text: All children of <code>#right-well</code> should have orange text.
+    testString: assert($("#right-well").children().css("color") === 'rgb(255, 165, 0)', 'All children of <code>#right-well</code> should have orange text.');
+  - text: You should use the <code>children&#40&#41</code> function to modify these elements.
+    testString: assert(code.match(/\.children\(\)\.css/g), 'You should use the <code>children&#40&#41</code> function to modify these elements.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(code.match(/<div class="well" id="right-well">/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(code.match(/<div class="well" id="right-well">/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-parent-of-an-element-using-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-parent-of-an-element-using-jquery.english.md
index ce693ad607..c7b6ff2fe8 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-parent-of-an-element-using-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-parent-of-an-element-using-jquery.english.md
@@ -25,13 +25,13 @@ Give the parent of the <code>#target1</code> element a background-color of red.
 ```yml
 tests:
   - text: Your <code>left-well</code> element should have a red background.
-    testString: 'assert($("#left-well").css("background-color") === "red" || $("#left-well").css("background-color") === "rgb(255, 0, 0)" || $("#left-well").css("background-color").toLowerCase() === "#ff0000" || $("#left-well").css("background-color").toLowerCase() === "#f00", "Your <code>left-well</code> element should have a red background.");'
-  - text: 'You should use the <code>&#46;parent&#40;&#41;</code> function to modify this element.'
-    testString: 'assert(code.match(/\.parent\s*\(\s*\)\s*\.css/g), "You should use the <code>&#46;parent&#40;&#41;</code> function to modify this element.");'
-  - text: 'The <code>&#46;parent&#40;&#41;</code> method should be called on the <code>&#35;target1</code> element.'
-    testString: 'assert(code.match(/\$\s*?\(\s*?(?:"|")\s*?#target1\s*?(?:"|")\s*?\)\s*?\.parent/gi), "The <code>&#46;parent&#40;&#41;</code> method should be called on the <code>&#35;target1</code> element.");'
+    testString: assert($("#left-well").css("background-color") === 'red' || $("#left-well").css("background-color") === 'rgb(255, 0, 0)' || $("#left-well").css("background-color").toLowerCase() === '#ff0000' || $("#left-well").css("background-color").toLowerCase() === '#f00', 'Your <code>left-well</code> element should have a red background.');
+  - text: You should use the <code>&#46;parent&#40;&#41;</code> function to modify this element.
+    testString: assert(code.match(/\.parent\s*\(\s*\)\s*\.css/g), 'You should use the <code>&#46;parent&#40;&#41;</code> function to modify this element.');
+  - text: The <code>&#46;parent&#40;&#41;</code> method should be called on the <code>&#35;target1</code> element.
+    testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")\s*?\)\s*?\.parent/gi), 'The <code>&#46;parent&#40;&#41;</code> method should be called on the <code>&#35;target1</code> element.');
   - text: Only use jQuery to add these classes to the element.
-    testString: 'assert(code.match(/<div class="well" id="left-well">/g), "Only use jQuery to add these classes to the element.");'
+    testString: assert(code.match(/<div class="well" id="left-well">/g), 'Only use jQuery to add these classes to the element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-same-element-with-multiple-jquery-selectors.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-same-element-with-multiple-jquery-selectors.english.md
index 25615d5739..ca3f104a3d 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-same-element-with-multiple-jquery-selectors.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/target-the-same-element-with-multiple-jquery-selectors.english.md
@@ -27,16 +27,16 @@ Add the <code>btn-primary</code> class to the button with id <code>#target1</cod
 
 ```yml
 tests:
-  - text: 'Use the <code>$&#40"button"&#41</code> selector.'
-    testString: 'assert(code.match(/\$\s*?\(\s*?(?:"|")\s*?button\s*?(?:"|")/gi), "Use the <code>$&#40"button"&#41</code> selector.");'
-  - text: 'Use the <code>$&#40".btn"&#41</code> selector.'
-    testString: 'assert(code.match(/\$\s*?\(\s*?(?:"|")\s*?\.btn\s*?(?:"|")/gi), "Use the <code>$&#40".btn"&#41</code> selector.");'
-  - text: 'Use the <code>$&#40"#target1"&#41</code> selector.'
-    testString: 'assert(code.match(/\$\s*?\(\s*?(?:"|")\s*?#target1\s*?(?:"|")/gi), "Use the <code>$&#40"#target1"&#41</code> selector.");'
+  - text: Use the <code>$&#40"button"&#41</code> selector.
+    testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?button\s*?(?:'|")/gi), 'Use the <code>$&#40"button"&#41</code> selector.');
+  - text: Use the <code>$&#40".btn"&#41</code> selector.
+    testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?\.btn\s*?(?:'|")/gi), 'Use the <code>$&#40".btn"&#41</code> selector.');
+  - text: Use the <code>$&#40"#target1"&#41</code> selector.
+    testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")/gi), 'Use the <code>$&#40"#target1"&#41</code> selector.');
   - text: Only add one class with each of your three selectors.
-    testString: 'assert(code.match(/addClass/g) && code.match(/addClass\s*?\(\s*?("|")\s*?[\w-]+\s*?\1\s*?\)/g).length > 2, "Only add one class with each of your three selectors.");'
-  - text: 'Your <code>#target1</code> element should have the classes <code>animated</code>&#130; <code>shake</code> and <code>btn-primary</code>.'
-    testString: 'assert($("#target1").hasClass("animated") && $("#target1").hasClass("shake") && $("#target1").hasClass("btn-primary"), "Your <code>#target1</code> element should have the classes <code>animated</code>&#130; <code>shake</code> and <code>btn-primary</code>.");'
+    testString: assert(code.match(/addClass/g) && code.match(/addClass\s*?\(\s*?('|")\s*?[\w-]+\s*?\1\s*?\)/g).length > 2, 'Only add one class with each of your three selectors.');
+  - text: Your <code>#target1</code> element should have the classes <code>animated</code>&#130; <code>shake</code> and <code>btn-primary</code>.
+    testString: assert($('#target1').hasClass('animated') && $('#target1').hasClass('shake') && $('#target1').hasClass('btn-primary'), 'Your <code>#target1</code> element should have the classes <code>animated</code>&#130; <code>shake</code> and <code>btn-primary</code>.');
   - text: Only use jQuery to add these classes to the element.
     testString: 'assert(!code.match(/class.*animated/g), "Only use jQuery to add these classes to the element.");'
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/use-appendto-to-move-elements-with-jquery.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/use-appendto-to-move-elements-with-jquery.english.md
index e8347ea275..2f8507f84c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/use-appendto-to-move-elements-with-jquery.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/use-appendto-to-move-elements-with-jquery.english.md
@@ -24,11 +24,11 @@ Move your <code>target2</code> element from your <code>left-well</code> to your
 ```yml
 tests:
   - text: Your <code>target2</code> element should not be inside your <code>left-well</code>.
-    testString: 'assert($("#left-well").children("#target2").length === 0, "Your <code>target2</code> element should not be inside your <code>left-well</code>.");'
+    testString: assert($("#left-well").children("#target2").length === 0, 'Your <code>target2</code> element should not be inside your <code>left-well</code>.');
   - text: Your <code>target2</code> element should be inside your <code>right-well</code>.
-    testString: 'assert($("#right-well").children("#target2").length > 0, "Your <code>target2</code> element should be inside your <code>right-well</code>.");'
+    testString: assert($("#right-well").children("#target2").length > 0, 'Your <code>target2</code> element should be inside your <code>right-well</code>.');
   - text: Only use jQuery to move these elements.
-    testString: 'assert(!code.match(/class.*animated/g), "Only use jQuery to move these elements.");'
+    testString: assert(!code.match(/class.*animated/g), 'Only use jQuery to move these elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/jquery/use-jquery-to-modify-the-entire-page.english.md b/curriculum/challenges/english/03-front-end-libraries/jquery/use-jquery-to-modify-the-entire-page.english.md
index d38599cd8d..927eb1b744 100644
--- a/curriculum/challenges/english/03-front-end-libraries/jquery/use-jquery-to-modify-the-entire-page.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/jquery/use-jquery-to-modify-the-entire-page.english.md
@@ -25,7 +25,7 @@ But let's do something more dramatic. Add the classes <code>animated</code> and
 ```yml
 tests:
   - text: Add the classes <code>animated</code> and <code>hinge</code> to your <code>body</code> element.
-    testString: 'assert($("body").hasClass("animated") && $("body").hasClass("hinge"), "Add the classes <code>animated</code> and <code>hinge</code> to your <code>body</code> element.");'
+    testString: assert($('body').hasClass('animated') && $('body').hasClass('hinge'), 'Add the classes <code>animated</code> and <code>hinge</code> to your <code>body</code> element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-react.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-react.english.md
index 9655451b4e..5539e1ea5b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-react.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-react.english.md
@@ -24,11 +24,11 @@ The code editor has the <code>mapStateToProps()</code> and <code>mapDispatchToPr
 ```yml
 tests:
   - text: The <code>Presentational</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("Presentational").length === 1; })(), "The <code>Presentational</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('Presentational').length === 1; })(), 'The <code>Presentational</code> component should render.');
   - text: The <code>Presentational</code> component should receive a prop <code>messages</code> via <code>connect</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const props = mockedComponent.find("Presentational").props(); return props.messages === "__INITIAL__STATE__"; })(), "The <code>Presentational</code> component should receive a prop <code>messages</code> via <code>connect</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const props = mockedComponent.find('Presentational').props(); return props.messages === '__INITIAL__STATE__'; })(), 'The <code>Presentational</code> component should receive a prop <code>messages</code> via <code>connect</code>.');
   - text: The <code>Presentational</code> component should receive a prop <code>submitNewMessage</code> via <code>connect</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const props = mockedComponent.find("Presentational").props(); return typeof props.submitNewMessage === "function"; })(), "The <code>Presentational</code> component should receive a prop <code>submitNewMessage</code> via <code>connect</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const props = mockedComponent.find('Presentational').props(); return typeof props.submitNewMessage === 'function'; })(), 'The <code>Presentational</code> component should receive a prop <code>submitNewMessage</code> via <code>connect</code>.');
 
 ```
 
@@ -82,7 +82,20 @@ const connect = ReactRedux.connect;
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+
+const store = Redux.createStore(
+  (state = '__INITIAL__STATE__', action) => state
+);
+class AppWrapper extends React.Component {
+  render() {
+    return (
+      <ReactRedux.Provider store = {store}>
+        <ConnectedComponent/>
+      </ReactRedux.Provider>
+    );
+  }
+};
+ReactDOM.render(<AppWrapper />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.english.md
index d94d6ec817..0e746637de 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.english.md
@@ -22,15 +22,15 @@ The code editor has all the code you've written in this section so far. The only
 ```yml
 tests:
   - text: The <code>AppWrapper</code> should render to the page.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("AppWrapper").length === 1; })(), "The <code>AppWrapper</code> should render to the page.");'
-  - text: 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("Presentational").length === 1; })(), "The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.");'
-  - text: 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find("Presentational"); return ( PresentationalComponent.find("div").length === 1 && PresentationalComponent.find("h2").length === 1 && PresentationalComponent.find("button").length === 1 && PresentationalComponent.find("ul").length === 1 ); })(), "The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('AppWrapper').length === 1; })(), 'The <code>AppWrapper</code> should render to the page.');
+  - text: The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('Presentational').length === 1; })(), 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.');
+  - text: The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find('Presentational'); return ( PresentationalComponent.find('div').length === 1 && PresentationalComponent.find('h2').length === 1 && PresentationalComponent.find('button').length === 1 && PresentationalComponent.find('ul').length === 1 ); })(), 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.');
   - text: The <code>Presentational</code> component should receive <code>messages</code> from the Redux store as a prop.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find("Presentational"); const props = PresentationalComponent.props(); return Array.isArray(props.messages); })(), "The <code>Presentational</code> component should receive <code>messages</code> from the Redux store as a prop.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find('Presentational'); const props = PresentationalComponent.props(); return Array.isArray(props.messages); })(), 'The <code>Presentational</code> component should receive <code>messages</code> from the Redux store as a prop.');
   - text: The <code>Presentational</code> component should receive the <code>submitMessage</code> action creator as a prop.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find("Presentational"); const props = PresentationalComponent.props(); return typeof props.submitNewMessage === "function"; })(), "The <code>Presentational</code> component should receive the <code>submitMessage</code> action creator as a prop.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find('Presentational'); const props = PresentationalComponent.props(); return typeof props.submitNewMessage === 'function'; })(), 'The <code>Presentational</code> component should receive the <code>submitMessage</code> action creator as a prop.');
 
 ```
 
@@ -71,7 +71,7 @@ class Presentational extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
     this.handleChange = this.handleChange.bind(this);
@@ -85,7 +85,7 @@ class Presentational extends React.Component {
   submitMessage() {
     const currentMessage = this.state.input;
     this.setState({
-      input: ",
+      input: '',
       messages: this.state.messages.concat(currentMessage)
     });
   }
@@ -147,7 +147,7 @@ class AppWrapper extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<AppWrapper />, document.getElementById('root'))
 ```
 
 </div>
@@ -188,7 +188,7 @@ class Presentational extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
  this.handleChange = this.handleChange.bind(this);
@@ -202,7 +202,7 @@ class Presentational extends React.Component {
   submitMessage() {
     const currentMessage = this.state.input;
     this.setState({
-      input: ",
+      input: '',
       messages: this.state.messages.concat(currentMessage)
     });
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.english.md
index f59de0824a..122d13ec80 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.english.md
@@ -22,23 +22,23 @@ Once these changes are made, the app will continue to function the same, except
 ```yml
 tests:
   - text: The <code>AppWrapper</code> should render to the page.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("AppWrapper").length === 1; })(), "The <code>AppWrapper</code> should render to the page.");'
-  - text: 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("Presentational").length === 1; })(), "The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.");'
-  - text: 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find("Presentational"); return ( PresentationalComponent.find("div").length === 1 && PresentationalComponent.find("h2").length === 1 && PresentationalComponent.find("button").length === 1 && PresentationalComponent.find("ul").length === 1 ); })(), "The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('AppWrapper').length === 1; })(), 'The <code>AppWrapper</code> should render to the page.');
+  - text: The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('Presentational').length === 1; })(), 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.');
+  - text: The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find('Presentational'); return ( PresentationalComponent.find('div').length === 1 && PresentationalComponent.find('h2').length === 1 && PresentationalComponent.find('button').length === 1 && PresentationalComponent.find('ul').length === 1 ); })(), 'The <code>Presentational</code> component should render an <code>h2</code>, <code>input</code>, <code>button</code>, and <code>ul</code> elements.');
   - text: The <code>Presentational</code> component should receive <code>messages</code> from the Redux store as a prop.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find("Presentational"); const props = PresentationalComponent.props(); return Array.isArray(props.messages); })(), "The <code>Presentational</code> component should receive <code>messages</code> from the Redux store as a prop.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find('Presentational'); const props = PresentationalComponent.props(); return Array.isArray(props.messages); })(), 'The <code>Presentational</code> component should receive <code>messages</code> from the Redux store as a prop.');
   - text: The <code>Presentational</code> component should receive the <code>submitMessage</code> action creator as a prop.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find("Presentational"); const props = PresentationalComponent.props(); return typeof props.submitNewMessage === "function"; })(), "The <code>Presentational</code> component should receive the <code>submitMessage</code> action creator as a prop.");'
-  - text: 'The state of the <code>Presentational</code> component should contain one property, <code>input</code>, which is initialized to an empty string.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalState = mockedComponent.find("Presentational").instance().state; return typeof PresentationalState.input === "string" && Object.keys(PresentationalState).length === 1; })(), "The state of the <code>Presentational</code> component should contain one property, <code>input</code>, which is initialized to an empty string.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalComponent = mockedComponent.find('Presentational'); const props = PresentationalComponent.props(); return typeof props.submitNewMessage === 'function'; })(), 'The <code>Presentational</code> component should receive the <code>submitMessage</code> action creator as a prop.');
+  - text: The state of the <code>Presentational</code> component should contain one property, <code>input</code>, which is initialized to an empty string.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const PresentationalState = mockedComponent.find('Presentational').instance().state; return typeof PresentationalState.input === 'string' && Object.keys(PresentationalState).length === 1; })(), 'The state of the <code>Presentational</code> component should contain one property, <code>input</code>, which is initialized to an empty string.');
   - text: Typing in the <code>input</code> element should update the state of the <code>Presentational</code> component.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const testValue = "__MOCK__INPUT__"; const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); let initialInput = mockedComponent.find("Presentational").find("input"); const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const updated = await changed(); const updatedInput = updated.find("Presentational").find("input"); assert(initialInput.props().value === "" && updatedInput.props().value === "__MOCK__INPUT__", "Typing in the <code>input</code> element should update the state of the <code>Presentational</code> component."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const testValue = ''__MOCK__INPUT__''; const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); let initialInput = mockedComponent.find(''Presentational'').find(''input''); const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const updated = await changed(); const updatedInput = updated.find(''Presentational'').find(''input''); assert(initialInput.props().value === '''' && updatedInput.props().value === ''__MOCK__INPUT__'', ''Typing in the <code>input</code> element should update the state of the <code>Presentational</code> component.''); }; '
   - text: Dispatching the <code>submitMessage</code> on the <code>Presentational</code> component should update Redux store and clear the input in local state.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); let beforeProps = mockedComponent.find("Presentational").props(); const testValue = "__TEST__EVENT__INPUT__"; const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const clickButton = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterChange = await changed(); const afterChangeInput = afterChange.find("input").props().value; const afterClick = await clickButton(); const afterProps = mockedComponent.find("Presentational").props(); assert(beforeProps.messages.length === 0 && afterChangeInput === testValue && afterProps.messages.pop() === testValue && afterClick.find("input").props().value === "", "Dispatching the <code>submitMessage</code> on the <code>Presentational</code> component should update Redux store and clear the input in local state."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); let beforeProps = mockedComponent.find(''Presentational'').props(); const testValue = ''__TEST__EVENT__INPUT__''; const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const clickButton = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent )}; const afterChange = await changed(); const afterChangeInput = afterChange.find(''input'').props().value; const afterClick = await clickButton(); const afterProps = mockedComponent.find(''Presentational'').props(); assert(beforeProps.messages.length === 0 && afterChangeInput === testValue && afterProps.messages.pop() === testValue && afterClick.find(''input'').props().value === '''', ''Dispatching the <code>submitMessage</code> on the <code>Presentational</code> component should update Redux store and clear the input in local state.''); }; '
   - text: The <code>Presentational</code> component should render the <code>messages</code> from the Redux store.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); let beforeProps = mockedComponent.find("Presentational").props(); const testValue = "__TEST__EVENT__INPUT__"; const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const clickButton = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterChange = await changed(); const afterChangeInput = afterChange.find("input").props().value; const afterClick = await clickButton(); const afterProps = mockedComponent.find("Presentational").props(); assert(beforeProps.messages.length === 0 && afterChangeInput === testValue && afterProps.messages.pop() === testValue && afterClick.find("input").props().value === "" && afterClick.find("ul").childAt(0).text() === testValue, "The <code>Presentational</code> component should render the <code>messages</code> from the Redux store."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); let beforeProps = mockedComponent.find(''Presentational'').props(); const testValue = ''__TEST__EVENT__INPUT__''; const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const clickButton = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent )}; const afterChange = await changed(); const afterChangeInput = afterChange.find(''input'').props().value; const afterClick = await clickButton(); const afterProps = mockedComponent.find(''Presentational'').props(); assert(beforeProps.messages.length === 0 && afterChangeInput === testValue && afterProps.messages.pop() === testValue && afterClick.find(''input'').props().value === '''' && afterClick.find(''ul'').childAt(0).text() === testValue, ''The <code>Presentational</code> component should render the <code>messages</code> from the Redux store.''); }; '
 
 ```
 
@@ -83,7 +83,7 @@ class Presentational extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
     this.handleChange = this.handleChange.bind(this);
@@ -96,7 +96,7 @@ class Presentational extends React.Component {
   }
   submitMessage() {
     this.setState({
-      input: ",
+      input: '',
       messages: this.state.messages.concat(this.state.input)
     });
   }
@@ -154,7 +154,7 @@ class AppWrapper extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<AppWrapper />, document.getElementById('root'))
 ```
 
 </div>
@@ -199,7 +199,7 @@ class Presentational extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: "
+      input: ''
     }
  this.handleChange = this.handleChange.bind(this);
  this.submitMessage = this.submitMessage.bind(this);
@@ -212,7 +212,7 @@ class Presentational extends React.Component {
   submitMessage() {
     this.props.submitNewMessage(this.state.input);
     this.setState({
-      input: "
+      input: ''
     });
   }
   render() {
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.english.md
index 53b2968f89..aadb093b1c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.english.md
@@ -22,17 +22,17 @@ Then create a reducer called <code>messageReducer()</code> that handles the stat
 ```yml
 tests:
   - text: The const <code>ADD</code> should exist and hold a value equal to the string <code>ADD</code>
-    testString: 'assert(ADD === "ADD", "The const <code>ADD</code> should exist and hold a value equal to the string <code>ADD</code>");'
+    testString: assert(ADD === 'ADD', 'The const <code>ADD</code> should exist and hold a value equal to the string <code>ADD</code>');
   - text: The action creator <code>addMessage</code> should return an object with <code>type</code> equal to <code>ADD</code> and message equal to the message that is passed in.
-    testString: 'assert((function() { const addAction = addMessage("__TEST__MESSAGE__"); return addAction.type === ADD && addAction.message === "__TEST__MESSAGE__"; })(), "The action creator <code>addMessage</code> should return an object with <code>type</code> equal to <code>ADD</code> and message equal to the message that is passed in.");'
+    testString: assert((function() { const addAction = addMessage('__TEST__MESSAGE__'); return addAction.type === ADD && addAction.message === '__TEST__MESSAGE__'; })(), 'The action creator <code>addMessage</code> should return an object with <code>type</code> equal to <code>ADD</code> and message equal to the message that is passed in.');
   - text: <code>messageReducer</code> should be a function.
-    testString: 'assert(typeof messageReducer === "function", "<code>messageReducer</code> should be a function.");'
+    testString: assert(typeof messageReducer === 'function', '<code>messageReducer</code> should be a function.');
   - text: The store should exist and have an initial state set to an empty array.
-    testString: 'assert((function() { const initialState = store.getState(); return typeof store === "object" && initialState.length === 0; })(), "The store should exist and have an initial state set to an empty array.");'
+    testString: assert((function() { const initialState = store.getState(); return typeof store === 'object' && initialState.length === 0; })(), 'The store should exist and have an initial state set to an empty array.');
   - text: Dispatching <code>addMessage</code> against the store should immutably add a new message to the array of messages held in state.
-    testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(addMessage("__A__TEST__MESSAGE")); const addState = store.getState(); return (isFrozen && addState[0] === "__A__TEST__MESSAGE"); })(), "Dispatching <code>addMessage</code> against the store should immutably add a new message to the array of messages held in state.");'
+    testString: assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(addMessage('__A__TEST__MESSAGE')); const addState = store.getState(); return (isFrozen && addState[0] === '__A__TEST__MESSAGE'); })(), 'Dispatching <code>addMessage</code> against the store should immutably add a new message to the array of messages held in state.');
   - text: The <code>messageReducer</code> should return the current state if called with any other actions.
-    testString: 'assert((function() { const addState = store.getState(); store.dispatch({type: "FAKE_ACTION"}); const testState = store.getState(); return (addState === testState); })(), "The <code>messageReducer</code> should return the current state if called with any other actions.");'
+    testString: 'assert((function() { const addState = store.getState(); store.dispatch({type: ''FAKE_ACTION''}); const testState = store.getState(); return (addState === testState); })(), ''The <code>messageReducer</code> should return the current state if called with any other actions.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.english.md
index 878230d0bc..5fb8d315f1 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.english.md
@@ -23,11 +23,11 @@ Start with a <code>DisplayMessages</code> component. Add a constructor to this c
 ```yml
 tests:
   - text: The <code>DisplayMessages</code> component should render an empty <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); return mockedComponent.find("div").text() === "" })(), "The <code>DisplayMessages</code> component should render an empty <code>div</code> element.");'
-  - text: 'The <code>DisplayMessages</code> constructor should be called properly with <code>super</code>, passing in <code>props</code>.'
-    testString: 'getUserInput => assert((function() { const noWhiteSpace = getUserInput("index").replace(/\s/g,""); return noWhiteSpace.includes("constructor(props)") && noWhiteSpace.includes("super(props"); })(), "The <code>DisplayMessages</code> constructor should be called properly with <code>super</code>, passing in <code>props</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); return mockedComponent.find('div').text() === '' })(), 'The <code>DisplayMessages</code> component should render an empty <code>div</code> element.');
+  - text: The <code>DisplayMessages</code> constructor should be called properly with <code>super</code>, passing in <code>props</code>.
+    testString: getUserInput => assert((function() { const noWhiteSpace = getUserInput('index').replace(/\s/g,'); return noWhiteSpace.includes('constructor(props)') && noWhiteSpace.includes('super(props'); })(), 'The <code>DisplayMessages</code> constructor should be called properly with <code>super</code>, passing in <code>props</code>.');
   - text: 'The <code>DisplayMessages</code> component should have an initial state equal to <code>{input: "", messages: []}</code>.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const initialState = mockedComponent.state(); return typeof initialState === "object" && initialState.input === "" && Array.isArray(initialState.messages) && initialState.messages.length === 0; })(), "The <code>DisplayMessages</code> component should have an initial state equal to <code>{input: "", messages: []}</code>.");'
+    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const initialState = mockedComponent.state(); return typeof initialState === ''object'' && initialState.input === '''' && Array.isArray(initialState.messages) && initialState.messages.length === 0; })(), ''The <code>DisplayMessages</code> component should have an initial state equal to <code>{input: "", messages: []}</code>.'');'
 
 ```
 
@@ -56,7 +56,7 @@ class DisplayMessages extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<DisplayMessages />, document.getElementById('root'))
 ```
 
 </div>
@@ -72,7 +72,7 @@ class DisplayMessages extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/manage-state-locally-first.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/manage-state-locally-first.english.md
index 50bec8bec7..cd1bf2aad7 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/manage-state-locally-first.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/manage-state-locally-first.english.md
@@ -23,17 +23,17 @@ Finally, use the <code>ul</code> to map over the array of <code>messages</code>
 ```yml
 tests:
   - text: 'The <code>DisplayMessages</code> component should initialize with a state equal to <code>{ input: "", messages: [] }</code>.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const initialState = mockedComponent.state(); return ( typeof initialState === "object" && initialState.input === "" && initialState.messages.length === 0); })(), "The <code>DisplayMessages</code> component should initialize with a state equal to <code>{ input: "", messages: [] }</code>.");'
-  - text: 'The <code>DisplayMessages</code> component should render a <code>div</code> containing an <code>h2</code> element, a <code>button</code> element, a <code>ul</code> element, and <code>li</code> elements as children.'
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const state = () => { mockedComponent.setState({messages: ["__TEST__MESSAGE"]}); return waitForIt(() => mockedComponent )}; const updated = await state(); assert(updated.find("div").length === 1 && updated.find("h2").length === 1 && updated.find("button").length === 1 && updated.find("ul").length === 1, "The <code>DisplayMessages</code> component should render a <code>div</code> containing an <code>h2</code> element, a <code>button</code> element, a <code>ul</code> element, and <code>li</code> elements as children."); }; '
+    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const initialState = mockedComponent.state(); return ( typeof initialState === ''object'' && initialState.input === '''' && initialState.messages.length === 0); })(), ''The <code>DisplayMessages</code> component should initialize with a state equal to <code>{ input: "", messages: [] }</code>.'');'
+  - text: The <code>DisplayMessages</code> component should render a <code>div</code> containing an <code>h2</code> element, a <code>button</code> element, a <code>ul</code> element, and <code>li</code> elements as children.
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const state = () => { mockedComponent.setState({messages: [''__TEST__MESSAGE'']}); return waitForIt(() => mockedComponent )}; const updated = await state(); assert(updated.find(''div'').length === 1 && updated.find(''h2'').length === 1 && updated.find(''button'').length === 1 && updated.find(''ul'').length === 1, ''The <code>DisplayMessages</code> component should render a <code>div</code> containing an <code>h2</code> element, a <code>button</code> element, a <code>ul</code> element, and <code>li</code> elements as children.''); }; '
   - text: The <code>input</code> element should render the value of <code>input</code> in local state.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const testValue = "__TEST__EVENT__INPUT"; const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const updated = await changed(); assert(updated.find("input").props().value === testValue, "The <code>input</code> element should render the value of <code>input</code> in local state."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); const testValue = ''__TEST__EVENT__INPUT''; const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const updated = await changed(); assert(updated.find(''input'').props().value === testValue, ''The <code>input</code> element should render the value of <code>input</code> in local state.''); }; '
   - text: Calling the method <code>handleChange</code> should update the <code>input</code> value in state to the current input.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage = "__TEST__EVENT__MESSAGE__"; const changed = () => { causeChange(mockedComponent, testMessage); return waitForIt(() => mockedComponent )}; const afterInput = await changed(); assert(initialState.input === "" && afterInput.state().input === "__TEST__EVENT__MESSAGE__", "Calling the method <code>handleChange</code> should update the <code>input</code> value in state to the current input.");  }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage = ''__TEST__EVENT__MESSAGE__''; const changed = () => { causeChange(mockedComponent, testMessage); return waitForIt(() => mockedComponent )}; const afterInput = await changed(); assert(initialState.input === '''' && afterInput.state().input === ''__TEST__EVENT__MESSAGE__'', ''Calling the method <code>handleChange</code> should update the <code>input</code> value in state to the current input.'');  }; '
   - text: Clicking the <code>Add message</code> button should call the method <code>submitMessage</code> which should add the current <code>input</code> to the <code>messages</code> array in state.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage_1 = "__FIRST__MESSAGE__"; const firstChange = () => { causeChange(mockedComponent, testMessage_1); return waitForIt(() => mockedComponent )}; const firstResult = await firstChange(); const firstSubmit = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterSubmit_1 = await firstSubmit(); const submitState_1 = afterSubmit_1.state(); const testMessage_2 = "__SECOND__MESSAGE__"; const secondChange = () => { causeChange(mockedComponent, testMessage_2); return waitForIt(() => mockedComponent )}; const secondResult = await secondChange(); const secondSubmit = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterSubmit_2 = await secondSubmit(); const submitState_2 = afterSubmit_2.state(); assert(initialState.messages.length === 0 && submitState_1.messages.length === 1 && submitState_2.messages.length === 2 && submitState_2.messages[1] === testMessage_2, "Clicking the <code>Add message</code> button should call the method <code>submitMessage</code> which should add the current <code>input</code> to the <code>messages</code> array in state."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage_1 = ''__FIRST__MESSAGE__''; const firstChange = () => { causeChange(mockedComponent, testMessage_1); return waitForIt(() => mockedComponent )}; const firstResult = await firstChange(); const firstSubmit = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent )}; const afterSubmit_1 = await firstSubmit(); const submitState_1 = afterSubmit_1.state(); const testMessage_2 = ''__SECOND__MESSAGE__''; const secondChange = () => { causeChange(mockedComponent, testMessage_2); return waitForIt(() => mockedComponent )}; const secondResult = await secondChange(); const secondSubmit = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent )}; const afterSubmit_2 = await secondSubmit(); const submitState_2 = afterSubmit_2.state(); assert(initialState.messages.length === 0 && submitState_1.messages.length === 1 && submitState_2.messages.length === 2 && submitState_2.messages[1] === testMessage_2, ''Clicking the <code>Add message</code> button should call the method <code>submitMessage</code> which should add the current <code>input</code> to the <code>messages</code> array in state.''); }; '
   - text: The <code>submitMessage</code> method should clear the current input.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage = "__FIRST__MESSAGE__"; const firstChange = () => { causeChange(mockedComponent, testMessage); return waitForIt(() => mockedComponent )}; const firstResult = await firstChange(); const firstState = firstResult.state(); const firstSubmit = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterSubmit = await firstSubmit(); const submitState = afterSubmit.state(); assert(firstState.input === testMessage && submitState.input === "", "The <code>submitMessage</code> method should clear the current input."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find(''input'').simulate(''change'', { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage = ''__FIRST__MESSAGE__''; const firstChange = () => { causeChange(mockedComponent, testMessage); return waitForIt(() => mockedComponent )}; const firstResult = await firstChange(); const firstState = firstResult.state(); const firstSubmit = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent )}; const afterSubmit = await firstSubmit(); const submitState = afterSubmit.state(); assert(firstState.input === testMessage && submitState.input === '''', ''The <code>submitMessage</code> method should clear the current input.''); }; '
 
 ```
 
@@ -49,7 +49,7 @@ class DisplayMessages extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
   }
@@ -75,7 +75,7 @@ class DisplayMessages extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<DisplayMessages />, document.getElementById('root'))
 ```
 
 </div>
@@ -91,7 +91,7 @@ class DisplayMessages extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
  this.handleChange = this.handleChange.bind(this);
@@ -105,7 +105,7 @@ class DisplayMessages extends React.Component {
   submitMessage() {
     const currentMessage = this.state.input;
     this.setState({
-      input: ",
+      input: '',
       messages: this.state.messages.concat(currentMessage)
     });
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-dispatch-to-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-dispatch-to-props.english.md
index db50171792..71b0b71573 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-dispatch-to-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-dispatch-to-props.english.md
@@ -23,13 +23,13 @@ The code editor provides an action creator called <code>addMessage()</code>. Wri
 ```yml
 tests:
   - text: <code>addMessage</code> should return an object with keys <code>type</code> and <code>message</code>.
-    testString: 'assert((function() { const addMessageTest = addMessage(); return ( addMessageTest.hasOwnProperty("type") && addMessageTest.hasOwnProperty("message")); })(), "<code>addMessage</code> should return an object with keys <code>type</code> and <code>message</code>.");'
+    testString: assert((function() { const addMessageTest = addMessage(); return ( addMessageTest.hasOwnProperty('type') && addMessageTest.hasOwnProperty('message')); })(), '<code>addMessage</code> should return an object with keys <code>type</code> and <code>message</code>.');
   - text: <code>mapDispatchToProps</code> should be a function.
-    testString: 'assert(typeof mapDispatchToProps === "function", "<code>mapDispatchToProps</code> should be a function.");'
+    testString: assert(typeof mapDispatchToProps === 'function', '<code>mapDispatchToProps</code> should be a function.');
   - text: <code>mapDispatchToProps</code> should return an object.
-    testString: 'assert(typeof mapDispatchToProps() === "object", "<code>mapDispatchToProps</code> should return an object.");'
+    testString: assert(typeof mapDispatchToProps() === 'object', '<code>mapDispatchToProps</code> should return an object.');
   - text: Dispatching <code>addMessage</code> with <code>submitNewMessage</code> from <code>mapDispatchToProps</code> should return a message to the dispatch function.
-    testString: 'assert((function() { let testAction; const dispatch = (fn) => { testAction = fn; }; let dispatchFn = mapDispatchToProps(dispatch); dispatchFn.submitNewMessage("__TEST__MESSAGE__"); return (testAction.type === "ADD" && testAction.message === "__TEST__MESSAGE__"); })(), "Dispatching <code>addMessage</code> with <code>submitNewMessage</code> from <code>mapDispatchToProps</code> should return a message to the dispatch function.");'
+    testString: assert((function() { let testAction; const dispatch = (fn) => { testAction = fn; }; let dispatchFn = mapDispatchToProps(dispatch); dispatchFn.submitNewMessage('__TEST__MESSAGE__'); return (testAction.type === 'ADD' && testAction.message === '__TEST__MESSAGE__'); })(), 'Dispatching <code>addMessage</code> with <code>submitNewMessage</code> from <code>mapDispatchToProps</code> should return a message to the dispatch function.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-state-to-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-state-to-props.english.md
index 750a5aa8b4..b249843dfb 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-state-to-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/map-state-to-props.english.md
@@ -23,13 +23,13 @@ Create a function <code>mapStateToProps()</code>. This function should take <cod
 ```yml
 tests:
   - text: The const <code>state</code> should be an empty array.
-    testString: 'assert(Array.isArray(state) && state.length === 0, "The const <code>state</code> should be an empty array.");'
+    testString: assert(Array.isArray(state) && state.length === 0, 'The const <code>state</code> should be an empty array.');
   - text: <code>mapStateToProps</code> should be a function.
-    testString: 'assert(typeof mapStateToProps === "function", "<code>mapStateToProps</code> should be a function.");'
+    testString: assert(typeof mapStateToProps === 'function', '<code>mapStateToProps</code> should be a function.');
   - text: <code>mapStateToProps</code> should return an object.
-    testString: 'assert(typeof mapStateToProps() === "object", "<code>mapStateToProps</code> should return an object.");'
+    testString: assert(typeof mapStateToProps() === 'object', '<code>mapStateToProps</code> should return an object.');
   - text: Passing an array as state to <code>mapStateToProps</code> should return this array assigned to a key of <code>messages</code>.
-    testString: 'assert(mapStateToProps(["messages"]).messages.pop() === "messages", "Passing an array as state to <code>mapStateToProps</code> should return this array assigned to a key of <code>messages</code>.");'
+    testString: assert(mapStateToProps(['messages']).messages.pop() === 'messages', 'Passing an array as state to <code>mapStateToProps</code> should return this array assigned to a key of <code>messages</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/moving-forward-from-here.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/moving-forward-from-here.english.md
index 6e688feaab..fead8fdf7c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/moving-forward-from-here.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/moving-forward-from-here.english.md
@@ -24,7 +24,7 @@ Log the message <code>'Now I know React and Redux!'</code> to the console.
 ```yml
 tests:
   - text: The message <code>Now I know React and Redux!</code> should be logged to the console.
-    testString: 'assert(editor.getValue().includes("console.log("Now I know React and Redux!")") || editor.getValue().includes("console.log(\"Now I know React and Redux!\")"), "The message <code>Now I know React and Redux!</code> should be logged to the console.");'
+    testString: assert(editor.getValue().includes('console.log("Now I know React and Redux!")') || editor.getValue().includes('console.log(\'Now I know React and Redux!\')'), 'The message <code>Now I know React and Redux!</code> should be logged to the console.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.english.md b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.english.md
index 5f9591553f..e8cb5bbe21 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.english.md
@@ -24,13 +24,13 @@ The code editor now shows all your Redux and React code from the past several ch
 ```yml
 tests:
   - text: The <code>AppWrapper</code> should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("AppWrapper").length === 1; })(), "The <code>AppWrapper</code> should render.");'
-  - text: 'The <code>Provider</code> wrapper component should have a prop of <code>store</code> passed to it, equal to the Redux store.'
-    testString: 'getUserInput => assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return getUserInput("index").replace(/\s/g,"").includes("<Providerstore={store}>"); })(), "The <code>Provider</code> wrapper component should have a prop of <code>store</code> passed to it, equal to the Redux store.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('AppWrapper').length === 1; })(), 'The <code>AppWrapper</code> should render.');
+  - text: The <code>Provider</code> wrapper component should have a prop of <code>store</code> passed to it, equal to the Redux store.
+    testString: getUserInput => assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return getUserInput('index').replace(/\s/g,').includes('<Providerstore={store}>'); })(), 'The <code>Provider</code> wrapper component should have a prop of <code>store</code> passed to it, equal to the Redux store.');
   - text: <code>DisplayMessages</code> should render as a child of <code>AppWrapper</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("AppWrapper").find("DisplayMessages").length === 1; })(), "<code>DisplayMessages</code> should render as a child of <code>AppWrapper</code>.");'
-  - text: 'The <code>DisplayMessages</code> component should render an h2, input, button, and <code>ul</code> element.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find("div").length === 1 && mockedComponent.find("h2").length === 1 && mockedComponent.find("button").length === 1 && mockedComponent.find("ul").length === 1; })(), "The <code>DisplayMessages</code> component should render an h2, input, button, and <code>ul</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('AppWrapper').find('DisplayMessages').length === 1; })(), '<code>DisplayMessages</code> should render as a child of <code>AppWrapper</code>.');
+  - text: The <code>DisplayMessages</code> component should render an h2, input, button, and <code>ul</code> element.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(AppWrapper)); return mockedComponent.find('div').length === 1 && mockedComponent.find('h2').length === 1 && mockedComponent.find('button').length === 1 && mockedComponent.find('ul').length === 1; })(), 'The <code>DisplayMessages</code> component should render an h2, input, button, and <code>ul</code> element.');
 
 ```
 
@@ -74,7 +74,7 @@ class DisplayMessages extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
     this.handleChange = this.handleChange.bind(this);
@@ -88,7 +88,7 @@ class DisplayMessages extends React.Component {
   submitMessage() {
     const currentMessage = this.state.input;
     this.setState({
-      input: ",
+      input: '',
       messages: this.state.messages.concat(currentMessage)
     });
   }
@@ -129,7 +129,7 @@ class AppWrapper extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<AppWrapper />, document.getElementById('root'))
 ```
 
 </div>
@@ -171,7 +171,7 @@ class DisplayMessages extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
+      input: '',
       messages: []
     }
  this.handleChange = this.handleChange.bind(this);
@@ -185,7 +185,7 @@ class DisplayMessages extends React.Component {
   submitMessage() {
     const currentMessage = this.state.input;
     this.setState({
-      input: ",
+      input: '',
       messages: this.state.messages.concat(currentMessage)
     });
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/access-props-using-this.props.english.md b/curriculum/challenges/english/03-front-end-libraries/react/access-props-using-this.props.english.md
index 136fc977ef..ee4af05843 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/access-props-using-this.props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/access-props-using-this.props.english.md
@@ -22,15 +22,15 @@ Render an instance of the <code>ReturnTempPassword</code> component in the paren
 ```yml
 tests:
   - text: The <code>ResetPassword</code> component should return a single <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.children().type() === "div"; })(), "The <code>ResetPassword</code> component should return a single <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.children().type() === 'div'; })(), 'The <code>ResetPassword</code> component should return a single <code>div</code> element.');
   - text: The fourth child of <code>ResetPassword</code> should be the <code>ReturnTempPassword</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.children().childAt(3).name() === "ReturnTempPassword"; })(), "The fourth child of <code>ResetPassword</code> should be the <code>ReturnTempPassword</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.children().childAt(3).name() === 'ReturnTempPassword'; })(), 'The fourth child of <code>ResetPassword</code> should be the <code>ReturnTempPassword</code> component.');
   - text: The <code>ReturnTempPassword</code> component should have a prop called <code>tempPassword</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.find("ReturnTempPassword").props().tempPassword; })(), "The <code>ReturnTempPassword</code> component should have a prop called <code>tempPassword</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.find('ReturnTempPassword').props().tempPassword; })(), 'The <code>ReturnTempPassword</code> component should have a prop called <code>tempPassword</code>.');
   - text: The <code>tempPassword</code> prop of <code>ReturnTempPassword</code> should be equal to a string of at least <code>8</code> characters.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); const temp = mockedComponent.find("ReturnTempPassword").props().tempPassword; return typeof temp === "string" && temp.length >= 8; })(), "The <code>tempPassword</code> prop of <code>ReturnTempPassword</code> should be equal to a string of at least <code>8</code> characters.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); const temp = mockedComponent.find('ReturnTempPassword').props().tempPassword; return typeof temp === 'string' && temp.length >= 8; })(), 'The <code>tempPassword</code> prop of <code>ReturnTempPassword</code> should be equal to a string of at least <code>8</code> characters.');
   - text: The <code>ReturnTempPassword</code> component should display the password you create as the <code>tempPassword</code> prop within <code>strong</code> tags.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.find("strong").text() === mockedComponent.find("ReturnTempPassword").props().tempPassword; })(), "The <code>ReturnTempPassword</code> component should display the password you create as the <code>tempPassword</code> prop within <code>strong</code> tags.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ResetPassword)); return mockedComponent.find('strong').text() === mockedComponent.find('ReturnTempPassword').props().tempPassword; })(), 'The <code>ReturnTempPassword</code> component should display the password you create as the <code>tempPassword</code> prop within <code>strong</code> tags.');
 
 ```
 
@@ -85,7 +85,7 @@ class ResetPassword extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ResetPassword />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/add-comments-in-jsx.english.md b/curriculum/challenges/english/03-front-end-libraries/react/add-comments-in-jsx.english.md
index 4a6f062074..3e0efdad20 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/add-comments-in-jsx.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/add-comments-in-jsx.english.md
@@ -22,13 +22,13 @@ The code editor has a JSX element similar to what you created in the last challe
 ```yml
 tests:
   - text: The constant <code>JSX</code> should return a <code>div</code> element.
-    testString: 'assert(JSX.type === "div", "The constant <code>JSX</code> should return a <code>div</code> element.");'
+    testString: assert(JSX.type === 'div', 'The constant <code>JSX</code> should return a <code>div</code> element.');
   - text: The <code>div</code> should contain an <code>h1</code> tag as the first element.
-    testString: 'assert(JSX.props.children[0].type === "h1", "The <code>div</code> should contain an <code>h1</code> tag as the first element.");'
+    testString: assert(JSX.props.children[0].type === 'h1', 'The <code>div</code> should contain an <code>h1</code> tag as the first element.');
   - text: The <code>div</code> should contain a <code>p</code> tag as the second element.
-    testString: 'assert(JSX.props.children[1].type === "p", "The <code>div</code> should contain a <code>p</code> tag as the second element.");'
+    testString: assert(JSX.props.children[1].type === 'p', 'The <code>div</code> should contain a <code>p</code> tag as the second element.');
   - text: The <code>JSX</code> should include a comment.
-    testString: 'getUserInput => assert(getUserInput("index").includes("/*") && getUserInput("index").includes("*/"), "The <code>JSX</code> should include a comment.");'
+    testString: getUserInput => assert(getUserInput('index').includes('/*') && getUserInput('index').includes('*/'), 'The <code>JSX</code> should include a comment.');
 
 ```
 
@@ -55,7 +55,7 @@ const JSX = (
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(JSX, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/add-event-listeners.english.md b/curriculum/challenges/english/03-front-end-libraries/react/add-event-listeners.english.md
index c15b1e4df1..1d6b860536 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/add-event-listeners.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/add-event-listeners.english.md
@@ -23,13 +23,13 @@ Then, in <code>componentWillUnmount()</code>, remove this same event listener. Y
 ```yml
 tests:
   - text: <code>MyComponent</code> should render a <code>div</code> element which wraps an <code>h1</code> tag.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("div").children().find("h1").length === 1; })(), "<code>MyComponent</code> should render a <code>div</code> element which wraps an <code>h1</code> tag.");'
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find('div').children().find('h1').length === 1; })(), '<code>MyComponent</code> should render a <code>div</code> element which wraps an <code>h1</code> tag.');
   - text: A keydown listener should be attached to the document in <code>componentDidMount</code>.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const didMountString = mockedComponent.instance().componentDidMount.toString(); return new RegExp("document\.addEventListener(.|\n|\r)+keydown(.|\n|\r)+this\.handleKeyPress").test(didMountString); })(), "A keydown listener should be attached to the document in <code>componentDidMount</code>.");'
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const didMountString = mockedComponent.instance().componentDidMount.toString(); return new RegExp('document\.addEventListener(.|\n|\r)+keydown(.|\n|\r)+this\.handleKeyPress').test(didMountString); })(), 'A keydown listener should be attached to the document in <code>componentDidMount</code>.');
   - text: The keydown listener should be removed from the document in <code>componentWillUnmount</code>.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const willUnmountString = mockedComponent.instance().componentWillUnmount.toString(); return new RegExp("document\.removeEventListener(.|\n|\r)+keydown(.|\n|\r)+this\.handleKeyPress").test(willUnmountString); })(), "The keydown listener should be removed from the document in <code>componentWillUnmount</code>.");'
-  - text: 'Once the component has mounted, pressing <code>enter</code> should update its state and the rendered <code>h1</code> tag.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const beforeState = mockedComponent.state("message"); const beforeText = mockedComponent.find("h1").text(); const pressEnterKey = () => { mockedComponent.instance().handleKeyPress({ keyCode: 13 }); return waitForIt(() => { mockedComponent.update(); return { state: mockedComponent.state("message"), text: mockedComponent.find("h1").text()}; });}; const afterKeyPress = await pressEnterKey(); assert(beforeState !== afterKeyPress.state && beforeText !== afterKeyPress.text, "Once the component has mounted, pressing <code>enter</code> should update its state and the rendered <code>h1</code> tag."); }; '
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const willUnmountString = mockedComponent.instance().componentWillUnmount.toString(); return new RegExp('document\.removeEventListener(.|\n|\r)+keydown(.|\n|\r)+this\.handleKeyPress').test(willUnmountString); })(), 'The keydown listener should be removed from the document in <code>componentWillUnmount</code>.');
+  - text: Once the component has mounted, pressing <code>enter</code> should update its state and the rendered <code>h1</code> tag.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const beforeState = mockedComponent.state(''message''); const beforeText = mockedComponent.find(''h1'').text(); const pressEnterKey = () => { mockedComponent.instance().handleKeyPress({ keyCode: 13 }); return waitForIt(() => { mockedComponent.update(); return { state: mockedComponent.state(''message''), text: mockedComponent.find(''h1'').text()}; });}; const afterKeyPress = await pressEnterKey(); assert(beforeState !== afterKeyPress.state && beforeText !== afterKeyPress.text, ''Once the component has mounted, pressing <code>enter</code> should update its state and the rendered <code>h1</code> tag.''); }; '
 
 ```
 
@@ -45,7 +45,7 @@ class MyComponent extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      message: "
+      message: ''
     };
     this.handleEnter = this.handleEnter.bind(this);
     this.handleKeyPress = this.handleKeyPress.bind(this);
@@ -85,7 +85,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
@@ -101,7 +101,7 @@ class MyComponent extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      message: "
+      message: ''
     };
     this.handleKeyPress = this.handleKeyPress.bind(this);
     this.handleEnter = this.handleEnter.bind(this);  }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/add-inline-styles-in-react.english.md b/curriculum/challenges/english/03-front-end-libraries/react/add-inline-styles-in-react.english.md
index f7ffece696..56e46dddf1 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/add-inline-styles-in-react.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/add-inline-styles-in-react.english.md
@@ -22,17 +22,17 @@ If you have a large set of styles, you can assign a style <code>object</code> to
 ```yml
 tests:
   - text: The <code>styles</code> variable should be an <code>object</code> with three properties.
-    testString: 'assert(Object.keys(styles).length === 3, "The <code>styles</code> variable should be an <code>object</code> with three properties.");'
+    testString: assert(Object.keys(styles).length === 3, 'The <code>styles</code> variable should be an <code>object</code> with three properties.');
   - text: The <code>styles</code> variable should have a <code>color</code> property set to a value of <code>purple</code>.
-    testString: 'assert(styles.color === "purple", "The <code>styles</code> variable should have a <code>color</code> property set to a value of <code>purple</code>.");'
+    testString: assert(styles.color === 'purple', 'The <code>styles</code> variable should have a <code>color</code> property set to a value of <code>purple</code>.');
   - text: The <code>styles</code> variable should have a <code>fontSize</code> property set to a value of <code>40</code>.
-    testString: 'assert(styles.fontSize === 40, "The <code>styles</code> variable should have a <code>fontSize</code> property set to a value of <code>40</code>.");'
+    testString: assert(styles.fontSize === 40, 'The <code>styles</code> variable should have a <code>fontSize</code> property set to a value of <code>40</code>.');
   - text: The <code>styles</code> variable should have a <code>border</code> property set to a value of <code>2px solid purple</code>.
-    testString: 'assert(styles.border === "2px solid purple", "The <code>styles</code> variable should have a <code>border</code> property set to a value of <code>2px solid purple</code>.");'
+    testString: assert(styles.border === "2px solid purple", 'The <code>styles</code> variable should have a <code>border</code> property set to a value of <code>2px solid purple</code>.');
   - text: The component should render a <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return mockedComponent.type() === "div"; })(), "The component should render a <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return mockedComponent.type() === 'div'; })(), 'The component should render a <code>div</code> element.');
   - text: The <code>div</code> element should have its styles defined by the <code>styles</code> object.
-    testString: 'assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return (mockedComponent.props().style.color === "purple" && mockedComponent.props().style.fontSize === 40 && mockedComponent.props().style.border === "2px solid purple"); })(), "The <code>div</code> element should have its styles defined by the <code>styles</code> object.");'
+    testString: assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return (mockedComponent.props().style.color === "purple" && mockedComponent.props().style.fontSize === 40 && mockedComponent.props().style.border === "2px solid purple"); })(), 'The <code>div</code> element should have its styles defined by the <code>styles</code> object.');
 
 ```
 
@@ -66,7 +66,7 @@ class Colorful extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Colorful />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/bind-this-to-a-class-method.english.md b/curriculum/challenges/english/03-front-end-libraries/react/bind-this-to-a-class-method.english.md
index 760c01eb41..a063b6c154 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/bind-this-to-a-class-method.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/bind-this-to-a-class-method.english.md
@@ -24,12 +24,12 @@ Once you complete the above steps you should be able to click the button and see
 
 ```yml
 tests:
-  - text: '<code>MyComponent</code> should return a <code>div</code> element which wraps two elements, a button and an <code>h1</code> element, in that order.'
-    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).find("div").length === 1 && Enzyme.mount(React.createElement(MyComponent)).find("div").childAt(0).type() === "button" && Enzyme.mount(React.createElement(MyComponent)).find("div").childAt(1).type() === "h1", "<code>MyComponent</code> should return a <code>div</code> element which wraps two elements, a button and an <code>h1</code> element, in that order.");'
+  - text: <code>MyComponent</code> should return a <code>div</code> element which wraps two elements, a button and an <code>h1</code> element, in that order.
+    testString: assert(Enzyme.mount(React.createElement(MyComponent)).find('div').length === 1 && Enzyme.mount(React.createElement(MyComponent)).find('div').childAt(0).type() === 'button' && Enzyme.mount(React.createElement(MyComponent)).find('div').childAt(1).type() === 'h1', '<code>MyComponent</code> should return a <code>div</code> element which wraps two elements, a button and an <code>h1</code> element, in that order.');
   - text: 'The state of <code>MyComponent</code> should initialize with the key value pair <code>{ itemCount: 0 }</code>.'
-    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).state("itemCount") === 0, "The state of <code>MyComponent</code> should initialize with the key value pair <code>{ itemCount: 0 }</code>.");'
+    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).state(''itemCount'') === 0, ''The state of <code>MyComponent</code> should initialize with the key value pair <code>{ itemCount: 0 }</code>.'');'
   - text: Clicking the <code>button</code> element should run the <code>addItem</code> method and increment the state <code>itemCount</code> by <code>1</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ itemCount: 0 }); return waitForIt(() => mockedComponent.state("itemCount")); }; const second = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent.state("itemCount")); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === 0 && secondValue === 1, "Clicking the <code>button</code> element should run the <code>addItem</code> method and increment the state <code>itemCount</code> by <code>1</code>."); };'
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ itemCount: 0 }); return waitForIt(() => mockedComponent.state(''itemCount'')); }; const second = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent.state(''itemCount'')); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === 0 && secondValue === 1, ''Clicking the <code>button</code> element should run the <code>addItem</code> method and increment the state <code>itemCount</code> by <code>1</code>.''); };'
 
 ```
 
@@ -76,7 +76,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.english.md b/curriculum/challenges/english/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.english.md
index fd1f67c58c..d9f844b5dd 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.english.md
@@ -22,15 +22,15 @@ The code editor has a simple controlled input component with a styled border. Yo
 ```yml
 tests:
   - text: The <code>GateKeeper</code> component should render a <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.find("div").length === 1; })(), "The <code>GateKeeper</code> component should render a <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.find('div').length === 1; })(), 'The <code>GateKeeper</code> component should render a <code>div</code> element.');
   - text: The <code>GateKeeper</code> component should be initialized with a state key <code>input</code> set to an empty string.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.state().input === ""; })(), "The <code>GateKeeper</code> component should be initialized with a state key <code>input</code> set to an empty string.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.state().input === ''; })(), 'The <code>GateKeeper</code> component should be initialized with a state key <code>input</code> set to an empty string.');
   - text: The <code>GateKeeper</code> component should render an <code>h3</code> tag and an <code>input</code> tag.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.find("h3").length === 1 && mockedComponent.find("input").length === 1; })(), "The <code>GateKeeper</code> component should render an <code>h3</code> tag and an <code>input</code> tag.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.find('h3').length === 1 && mockedComponent.find('input').length === 1; })(), 'The <code>GateKeeper</code> component should render an <code>h3</code> tag and an <code>input</code> tag.');
   - text: The <code>input</code> tag should initially have a style of <code>1px solid black</code> for the <code>border</code> property.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.find("input").props().style.border === "1px solid black"; })(), "The <code>input</code> tag should initially have a style of <code>1px solid black</code> for the <code>border</code> property.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); return mockedComponent.find('input').props().style.border === '1px solid black'; })(), 'The <code>input</code> tag should initially have a style of <code>1px solid black</code> for the <code>border</code> property.');
   - text: The <code>input</code> tag should be styled with a border of <code>3px solid red</code> if the input value in state is longer than 15 characters.
-    testString: 'async () => {  const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); const simulateChange = (el, value) => el.simulate("change", {target: {value}}); let initialStyle = mockedComponent.find("input").props().style.border; const state_1 = () => { mockedComponent.setState({input: "this is 15 char" }); return waitForIt(() => mockedComponent.find("input").props().style.border )}; const state_2 = () => { mockedComponent.setState({input: "A very long string longer than 15 characters." }); return waitForIt(() => mockedComponent.find("input").props().style.border )}; const style_1 = await state_1(); const style_2 = await state_2(); assert(initialStyle === "1px solid black" && style_1 === "1px solid black" && style_2 === "3px solid red", "The <code>input</code> tag should be styled with a border of <code>3px solid red</code> if the input value in state is longer than 15 characters."); }; '
+    testString: 'async () => {  const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const mockedComponent = Enzyme.mount(React.createElement(GateKeeper)); const simulateChange = (el, value) => el.simulate(''change'', {target: {value}}); let initialStyle = mockedComponent.find(''input'').props().style.border; const state_1 = () => { mockedComponent.setState({input: ''this is 15 char'' }); return waitForIt(() => mockedComponent.find(''input'').props().style.border )}; const state_2 = () => { mockedComponent.setState({input: ''A very long string longer than 15 characters.'' }); return waitForIt(() => mockedComponent.find(''input'').props().style.border )}; const style_1 = await state_1(); const style_2 = await state_2(); assert(initialStyle === ''1px solid black'' && style_1 === ''1px solid black'' && style_2 === ''3px solid red'', ''The <code>input</code> tag should be styled with a border of <code>3px solid red</code> if the input value in state is longer than 15 characters.''); }; '
 
 ```
 
@@ -47,7 +47,7 @@ class GateKeeper extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: "
+      input: ''
     };
     this.handleChange = this.handleChange.bind(this);
   }
@@ -82,7 +82,7 @@ class GateKeeper extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<GateKeeper />, document.getElementById('root'))
 ```
 
 </div>
@@ -98,7 +98,7 @@ class GateKeeper extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: "
+      input: ''
     };
     this.handleChange = this.handleChange.bind(this);
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/compose-react-components.english.md b/curriculum/challenges/english/03-front-end-libraries/react/compose-react-components.english.md
index 61288fc148..b6e98fffa1 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/compose-react-components.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/compose-react-components.english.md
@@ -22,13 +22,13 @@ Nest two components inside of <code>Fruits</code> &mdash; first <code>NonCitrus<
 ```yml
 tests:
   - text: The <code>TypesOfFood</code> component should return a single <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().type() === "div"; })(), "The <code>TypesOfFood</code> component should return a single <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().type() === 'div'; })(), 'The <code>TypesOfFood</code> component should return a single <code>div</code> element.');
   - text: The <code>TypesOfFood</code> component should return the <code>Fruits</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(1).name() === "Fruits"; })(), "The <code>TypesOfFood</code> component should return the <code>Fruits</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(1).name() === 'Fruits'; })(), 'The <code>TypesOfFood</code> component should return the <code>Fruits</code> component.');
   - text: The <code>Fruits</code> component should return the <code>NonCitrus</code> component and the <code>Citrus</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return (mockedComponent.find("Fruits").children().find("NonCitrus").length === 1 && mockedComponent.find("Fruits").children().find("Citrus").length === 1); })(), "The <code>Fruits</code> component should return the <code>NonCitrus</code> component and the <code>Citrus</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return (mockedComponent.find('Fruits').children().find('NonCitrus').length === 1 && mockedComponent.find('Fruits').children().find('Citrus').length === 1); })(), 'The <code>Fruits</code> component should return the <code>NonCitrus</code> component and the <code>Citrus</code> component.');
   - text: The <code>TypesOfFood</code> component should return the <code>Vegetables</code> component below the <code>Fruits</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(2).name() === "Vegetables"; })(), "The <code>TypesOfFood</code> component should return the <code>Vegetables</code> component below the <code>Fruits</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(2).name() === 'Vegetables'; })(), 'The <code>TypesOfFood</code> component should return the <code>Vegetables</code> component below the <code>Fruits</code> component.');
 
 ```
 
@@ -132,7 +132,7 @@ class Vegetables extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<TypesOfFood />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-complex-jsx-element.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-complex-jsx-element.english.md
index cf9a258a38..59f9f2bef7 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-complex-jsx-element.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-complex-jsx-element.english.md
@@ -31,15 +31,15 @@ An <code>h1</code>, a <code>p</code>, and an unordered list that contains three
 ```yml
 tests:
   - text: The constant <code>JSX</code> should return a <code>div</code> element.
-    testString: 'assert(JSX.type === "div", "The constant <code>JSX</code> should return a <code>div</code> element.");'
+    testString: assert(JSX.type === 'div', 'The constant <code>JSX</code> should return a <code>div</code> element.');
   - text: The <code>div</code> should contain a <code>p</code> tag as the second element.
-    testString: 'assert(JSX.props.children[1].type === "p", "The <code>div</code> should contain a <code>p</code> tag as the second element.");'
+    testString: assert(JSX.props.children[1].type === 'p', 'The <code>div</code> should contain a <code>p</code> tag as the second element.');
   - text: The <code>div</code> should contain a <code>ul</code> tag as the third element.
-    testString: 'assert(JSX.props.children[2].type === "ul", "The <code>div</code> should contain a <code>ul</code> tag as the third element.");'
+    testString: assert(JSX.props.children[2].type === 'ul', 'The <code>div</code> should contain a <code>ul</code> tag as the third element.');
   - text: The <code>div</code> should contain an <code>h1</code> tag as the first element.
-    testString: 'assert(JSX.props.children[0].type === "h1", "The <code>div</code> should contain an <code>h1</code> tag as the first element.");'
+    testString: assert(JSX.props.children[0].type === 'h1', 'The <code>div</code> should contain an <code>h1</code> tag as the first element.');
   - text: The <code>ul</code> should contain three <code>li</code> elements.
-    testString: 'assert(JSX.props.children[2].props.children.length === 3, "The <code>ul</code> should contain three <code>li</code> elements.");'
+    testString: assert(JSX.props.children[2].props.children.length === 3, 'The <code>ul</code> should contain three <code>li</code> elements.');
 
 ```
 
@@ -62,7 +62,7 @@ tests:
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(JSX, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-component-with-composition.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-component-with-composition.english.md
index e3dc0081b6..24e2f0d6fc 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-component-with-composition.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-component-with-composition.english.md
@@ -25,11 +25,11 @@ In the code editor, there is a simple functional component called <code>ChildCom
 ```yml
 tests:
   - text: The React component should return a single <code>div</code> element.
-    testString: 'assert((function() { var shallowRender = Enzyme.shallow(React.createElement(ParentComponent)); return shallowRender.type() === "div"; })(), "The React component should return a single <code>div</code> element.");'
+    testString: assert((function() { var shallowRender = Enzyme.shallow(React.createElement(ParentComponent)); return shallowRender.type() === 'div'; })(), 'The React component should return a single <code>div</code> element.');
   - text: The component should return two nested elements.
-    testString: 'assert((function() { var shallowRender = Enzyme.shallow(React.createElement(ParentComponent)); return shallowRender.children().length === 2; })(), "The component should return two nested elements.");'
+    testString: assert((function() { var shallowRender = Enzyme.shallow(React.createElement(ParentComponent)); return shallowRender.children().length === 2; })(), 'The component should return two nested elements.');
   - text: The component should return the ChildComponent as its second child.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ParentComponent)); return mockedComponent.find("ParentComponent").find("ChildComponent").length === 1; })(), "The component should return the ChildComponent as its second child.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ParentComponent)); return mockedComponent.find('ParentComponent').find('ChildComponent').length === 1; })(), 'The component should return the ChildComponent as its second child.');
 
 ```
 
@@ -74,7 +74,7 @@ class ParentComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ParentComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-form.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-form.english.md
index 09a6f40714..579b1a1085 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-form.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-form.english.md
@@ -24,15 +24,15 @@ Finally, create an <code>h1</code> tag after the <code>form</code> which renders
 ```yml
 tests:
   - text: <code>MyForm</code> should return a <code>div</code> element which contains a <code>form</code> and an <code>h1</code> tag. The form should include an <code>input</code> and a <code>button</code>.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyForm)); return (mockedComponent.find("div").children().find("form").length === 1 && mockedComponent.find("div").children().find("h1").length === 1 && mockedComponent.find("form").children().find("input").length === 1 && mockedComponent.find("form").children().find("button").length === 1) })(), "<code>MyForm</code> should return a <code>div</code> element which contains a <code>form</code> and an <code>h1</code> tag. The form should include an <code>input</code> and a <code>button</code>.");'
-  - text: 'The state of <code>MyForm</code> should initialize with <code>input</code> and <code>submit</code> properties, both set to empty strings.'
-    testString: 'assert(Enzyme.mount(React.createElement(MyForm)).state("input") === "" && Enzyme.mount(React.createElement(MyForm)).state("submit") === "", "The state of <code>MyForm</code> should initialize with <code>input</code> and <code>submit</code> properties, both set to empty strings.");'
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyForm)); return (mockedComponent.find('div').children().find('form').length === 1 && mockedComponent.find('div').children().find('h1').length === 1 && mockedComponent.find('form').children().find('input').length === 1 && mockedComponent.find('form').children().find('button').length === 1) })(), '<code>MyForm</code> should return a <code>div</code> element which contains a <code>form</code> and an <code>h1</code> tag. The form should include an <code>input</code> and a <code>button</code>.');
+  - text: The state of <code>MyForm</code> should initialize with <code>input</code> and <code>submit</code> properties, both set to empty strings.
+    testString: assert(Enzyme.mount(React.createElement(MyForm)).state('input') === '' && Enzyme.mount(React.createElement(MyForm)).state('submit') === '', 'The state of <code>MyForm</code> should initialize with <code>input</code> and <code>submit</code> properties, both set to empty strings.');
   - text: Typing in the <code>input</code> element should update the <code>input</code> property of the component&apos;s state.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: "" }); return waitForIt(() => mockedComponent.state("input"))}; const _2 = () => { mockedComponent.find("input").simulate("change", { target: { value: "TestInput" }}); return waitForIt(() => ({ state: mockedComponent.state("input"), inputVal: mockedComponent.find("input").props().value }))}; const before = await _1(); const after = await _2(); assert(before === "" && after.state === "TestInput" && after.inputVal === "TestInput", "Typing in the <code>input</code> element should update the <code>input</code> property of the component&apos;s state."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: '''' }); return waitForIt(() => mockedComponent.state(''input''))}; const _2 = () => { mockedComponent.find(''input'').simulate(''change'', { target: { value: ''TestInput'' }}); return waitForIt(() => ({ state: mockedComponent.state(''input''), inputVal: mockedComponent.find(''input'').props().value }))}; const before = await _1(); const after = await _2(); assert(before === '''' && after.state === ''TestInput'' && after.inputVal === ''TestInput'', ''Typing in the <code>input</code> element should update the <code>input</code> property of the component&apos;s state.''); }; '
   - text: Submitting the form should run <code>handleSubmit</code> which should set the <code>submit</code> property in state equal to the current input.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: "" }); mockedComponent.setState({submit: ""}); mockedComponent.find("input").simulate("change", {target: {value: "SubmitInput"}}); return waitForIt(() => mockedComponent.state("submit"))}; const _2 = () => { mockedComponent.find("form").simulate("submit"); return waitForIt(() => mockedComponent.state("submit"))}; const before = await _1(); const after = await _2(); assert(before === "" && after === "SubmitInput", "Submitting the form should run <code>handleSubmit</code> which should set the <code>submit</code> property in state equal to the current input."); };'
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: '''' }); mockedComponent.setState({submit: ''''}); mockedComponent.find(''input'').simulate(''change'', {target: {value: ''SubmitInput''}}); return waitForIt(() => mockedComponent.state(''submit''))}; const _2 = () => { mockedComponent.find(''form'').simulate(''submit''); return waitForIt(() => mockedComponent.state(''submit''))}; const before = await _1(); const after = await _2(); assert(before === '''' && after === ''SubmitInput'', ''Submitting the form should run <code>handleSubmit</code> which should set the <code>submit</code> property in state equal to the current input.''); };'
   - text: The <code>h1</code> header should render the value of the <code>submit</code> field from the component&apos;s state.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: "" }); mockedComponent.setState({submit: ""}); mockedComponent.find("input").simulate("change", {target: {value: "TestInput"}}); return waitForIt(() => mockedComponent.find("h1").text())}; const _2 = () => { mockedComponent.find("form").simulate("submit"); return waitForIt(() => mockedComponent.find("h1").text())}; const before = await _1(); const after = await _2(); assert(before === "" && after === "TestInput", "The <code>h1</code> header should render the value of the <code>submit</code> field from the component&apos;s state."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: '''' }); mockedComponent.setState({submit: ''''}); mockedComponent.find(''input'').simulate(''change'', {target: {value: ''TestInput''}}); return waitForIt(() => mockedComponent.find(''h1'').text())}; const _2 = () => { mockedComponent.find(''form'').simulate(''submit''); return waitForIt(() => mockedComponent.find(''h1'').text())}; const before = await _1(); const after = await _2(); assert(before === '''' && after === ''TestInput'', ''The <code>h1</code> header should render the value of the <code>submit</code> field from the component&apos;s state.''); }; '
 
 ```
 
@@ -48,8 +48,8 @@ class MyForm extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
-      submit: "
+      input: '',
+      submit: ''
     };
     this.handleChange = this.handleChange.bind(this);
     this.handleSubmit = this.handleSubmit.bind(this);
@@ -89,7 +89,7 @@ class MyForm extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyForm />, document.getElementById('root'))
 ```
 
 </div>
@@ -105,8 +105,8 @@ class MyForm extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: ",
-      submit: "
+      input: '',
+      submit: ''
     };
     this.handleChange = this.handleChange.bind(this);
     this.handleSubmit = this.handleSubmit.bind(this);
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-input.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-input.english.md
index 64c8b16f0a..25ced0f9de 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-input.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-controlled-input.english.md
@@ -25,11 +25,11 @@ Last but not least, don't forget to add the necessary bindings in the constructo
 ```yml
 tests:
   - text: <code>ControlledInput</code> should return a <code>div</code> element which contains an <code>input</code> and a <code>p</code> tag.
-    testString: 'assert(Enzyme.mount(React.createElement(ControlledInput)).find("div").children().find("input").length === 1 && Enzyme.mount(React.createElement(ControlledInput)).find("div").children().find("p").length === 1, "<code>ControlledInput</code> should return a <code>div</code> element which contains an <code>input</code> and a <code>p</code> tag.");'
+    testString: assert(Enzyme.mount(React.createElement(ControlledInput)).find('div').children().find('input').length === 1 && Enzyme.mount(React.createElement(ControlledInput)).find('div').children().find('p').length === 1, '<code>ControlledInput</code> should return a <code>div</code> element which contains an <code>input</code> and a <code>p</code> tag.');
   - text: The state of <code>ControlledInput</code> should initialize with an <code>input</code> property set to an empty string.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(ControlledInput)).state("input"), "", "The state of <code>ControlledInput</code> should initialize with an <code>input</code> property set to an empty string.");'
-  - text: 'Typing in the input element should update the state and the value of the input, and the <code>p</code> element should render this state as you type.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(ControlledInput)); const _1 = () => { mockedComponent.setState({ input: "" }); return waitForIt(() => mockedComponent.state("input"))}; const _2 = () => { mockedComponent.find("input").simulate("change", { target: { value: "TestInput" }}); return waitForIt(() => ({ state: mockedComponent.state("input"), text: mockedComponent.find("p").text(), inputVal: mockedComponent.find("input").props().value }))}; const before = await _1(); const after = await _2(); assert(before === "" && after.state === "TestInput" && after.text === "TestInput" && after.inputVal === "TestInput", "Typing in the input element should update the state and the value of the input, and the <code>p</code> element should render this state as you type."); }; '
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(ControlledInput)).state('input'), '', 'The state of <code>ControlledInput</code> should initialize with an <code>input</code> property set to an empty string.');
+  - text: Typing in the input element should update the state and the value of the input, and the <code>p</code> element should render this state as you type.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(ControlledInput)); const _1 = () => { mockedComponent.setState({ input: '''' }); return waitForIt(() => mockedComponent.state(''input''))}; const _2 = () => { mockedComponent.find(''input'').simulate(''change'', { target: { value: ''TestInput'' }}); return waitForIt(() => ({ state: mockedComponent.state(''input''), text: mockedComponent.find(''p'').text(), inputVal: mockedComponent.find(''input'').props().value }))}; const before = await _1(); const after = await _2(); assert(before === '''' && after.state === ''TestInput'' && after.text === ''TestInput'' && after.inputVal === ''TestInput'', ''Typing in the input element should update the state and the value of the input, and the <code>p</code> element should render this state as you type.''); }; '
 
 ```
 
@@ -45,7 +45,7 @@ class ControlledInput extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: "
+      input: ''
     };
     // change code below this line
 
@@ -75,7 +75,7 @@ class ControlledInput extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ControlledInput />, document.getElementById('root'))
 ```
 
 </div>
@@ -91,7 +91,7 @@ class ControlledInput extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      input: "
+      input: ''
     };
     this.handleChange = this.handleChange.bind(this);
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-react-component.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-react-component.english.md
index 18321e69dc..64c6715d7a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-react-component.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-react-component.english.md
@@ -24,11 +24,11 @@ Also notice the <code>Kitten</code> class has a <code>constructor</code> defined
 ```yml
 tests:
   - text: The React component should return a <code>div</code> element.
-    testString: 'assert(Enzyme.shallow(React.createElement(MyComponent)).type() === "div", "The React component should return a <code>div</code> element.");'
+    testString: assert(Enzyme.shallow(React.createElement(MyComponent)).type() === 'div', 'The React component should return a <code>div</code> element.');
   - text: The returned <code>div</code> should render an <code>h1</code> header within it.
-    testString: 'assert(/<div><h1>.*<\/h1><\/div>/.test(Enzyme.shallow(React.createElement(MyComponent)).html()), "The returned <code>div</code> should render an <code>h1</code> header within it.");'
+    testString: assert(/<div><h1>.*<\/h1><\/div>/.test(Enzyme.shallow(React.createElement(MyComponent)).html()), 'The returned <code>div</code> should render an <code>h1</code> header within it.');
   - text: The <code>h1</code> header should contain the string <code>Hello React!</code>.
-    testString: 'assert(Enzyme.shallow(React.createElement(MyComponent)).html() === "<div><h1>Hello React!</h1></div>", "The <code>h1</code> header should contain the string <code>Hello React!</code>.");'
+    testString: assert(Enzyme.shallow(React.createElement(MyComponent)).html() === '<div><h1>Hello React!</h1></div>', 'The <code>h1</code> header should contain the string <code>Hello React!</code>.');
 
 ```
 
@@ -62,7 +62,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-simple-jsx-element.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-simple-jsx-element.english.md
index 89d1b0d9cb..7e2129ce71 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-simple-jsx-element.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-simple-jsx-element.english.md
@@ -25,9 +25,9 @@ It's worth noting that under the hood the challenges are calling <code>ReactDOM.
 ```yml
 tests:
   - text: The constant <code>JSX</code> should return an <code>h1</code> element.
-    testString: 'assert(JSX.type === "h1", "The constant <code>JSX</code> should return an <code>h1</code> element.");'
+    testString: assert(JSX.type === 'h1', 'The constant <code>JSX</code> should return an <code>h1</code> element.');
   - text: The <code>h1</code> tag should include the text <code>Hello JSX!</code>
-    testString: 'assert(Enzyme.shallow(JSX).contains("Hello JSX!"), "The <code>h1</code> tag should include the text <code>Hello JSX!</code>");'
+    testString: assert(Enzyme.shallow(JSX).contains('Hello JSX!'), 'The <code>h1</code> tag should include the text <code>Hello JSX!</code>');
 
 ```
 
@@ -51,7 +51,7 @@ const JSX = <div></div>;
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(JSX, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateful-component.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateful-component.english.md
index 666c976224..5e01eac3ac 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateful-component.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateful-component.english.md
@@ -24,13 +24,13 @@ There is a component in the code editor that is trying to render a <code>name</c
 ```yml
 tests:
   - text: <code>StatefulComponent</code> should exist and render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); return mockedComponent.find("StatefulComponent").length === 1; })(), "<code>StatefulComponent</code> should exist and render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); return mockedComponent.find('StatefulComponent').length === 1; })(), '<code>StatefulComponent</code> should exist and render.');
   - text: <code>StatefulComponent</code> should render a <code>div</code> and an <code>h1</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); return mockedComponent.find("div").length === 1 && mockedComponent.find("h1").length === 1; })(), "<code>StatefulComponent</code> should render a <code>div</code> and an <code>h1</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); return mockedComponent.find('div').length === 1 && mockedComponent.find('h1').length === 1; })(), '<code>StatefulComponent</code> should render a <code>div</code> and an <code>h1</code> element.');
   - text: The state of <code>StatefulComponent</code> should be initialized with a property <code>name</code> set to a string.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); const initialState = mockedComponent.state(); return ( typeof initialState === "object" && typeof initialState.name === "string"); })(), "The state of <code>StatefulComponent</code> should be initialized with a property <code>name</code> set to a string.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); const initialState = mockedComponent.state(); return ( typeof initialState === 'object' && typeof initialState.name === 'string'); })(), 'The state of <code>StatefulComponent</code> should be initialized with a property <code>name</code> set to a string.');
   - text: The property <code>name</code> in the state of <code>StatefulComponent</code> should render in the <code>h1</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); const initialState = mockedComponent.state(); return mockedComponent.find("h1").text() === initialState.name; })(), "The property <code>name</code> in the state of <code>StatefulComponent</code> should render in the <code>h1</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(StatefulComponent)); const initialState = mockedComponent.state(); return mockedComponent.find('h1').text() === initialState.name; })(), 'The property <code>name</code> in the state of <code>StatefulComponent</code> should render in the <code>h1</code> element.');
 
 ```
 
@@ -66,7 +66,7 @@ class StatefulComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<StatefulComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateless-functional-component.english.md b/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateless-functional-component.english.md
index 75a5fc8cd6..4279f7faae 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateless-functional-component.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/create-a-stateless-functional-component.english.md
@@ -26,11 +26,11 @@ The code editor has a function called <code>MyComponent</code>. Complete this fu
 ```yml
 tests:
   - text: <code>MyComponent</code> should return JSX.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.length === 1; })(), "<code>MyComponent</code> should return JSX.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.length === 1; })(), '<code>MyComponent</code> should return JSX.');
   - text: <code>MyComponent</code> should return a <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.children().type() === "div" })(), "<code>MyComponent</code> should return a <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.children().type() === 'div' })(), '<code>MyComponent</code> should return a <code>div</code> element.');
   - text: The <code>div</code> element should contain a string of text.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("div").text() !== ""; })(), "The <code>div</code> element should contain a string of text.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find('div').text() !== ''; })(), 'The <code>div</code> element should contain a string of text.');
 
 ```
 
@@ -58,7 +58,7 @@ const MyComponent = function() {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/define-an-html-class-in-jsx.english.md b/curriculum/challenges/english/03-front-end-libraries/react/define-an-html-class-in-jsx.english.md
index 92436ae253..8fce5ee04c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/define-an-html-class-in-jsx.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/define-an-html-class-in-jsx.english.md
@@ -24,9 +24,9 @@ Apply a class of <code>myDiv</code> to the <code>div</code> provided in the JSX
 ```yml
 tests:
   - text: The constant <code>JSX</code> should return a <code>div</code> element.
-    testString: 'assert.strictEqual(JSX.type, "div", "The constant <code>JSX</code> should return a <code>div</code> element.");'
+    testString: assert.strictEqual(JSX.type, 'div', 'The constant <code>JSX</code> should return a <code>div</code> element.');
   - text: The <code>div</code> has a class of <code>myDiv</code>.
-    testString: 'assert.strictEqual(JSX.props.className, "myDiv", "The <code>div</code> has a class of <code>myDiv</code>.");'
+    testString: assert.strictEqual(JSX.props.className, 'myDiv', 'The <code>div</code> has a class of <code>myDiv</code>.');
 
 ```
 
@@ -52,7 +52,7 @@ const JSX = (
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(JSX, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.english.md b/curriculum/challenges/english/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.english.md
index 8374bd1b9a..7f364b9b4e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.english.md
@@ -22,15 +22,15 @@ Normally, you want to make the key something that uniquely identifies the elemen
 ```yml
 tests:
   - text: The <code>Frameworks</code> component should exist and render to the page.
-    testString: 'assert(Enzyme.mount(React.createElement(Frameworks)).find("Frameworks").length === 1, "The <code>Frameworks</code> component should exist and render to the page.");'
+    testString: assert(Enzyme.mount(React.createElement(Frameworks)).find('Frameworks').length === 1, 'The <code>Frameworks</code> component should exist and render to the page.');
   - text: <code>Frameworks</code> should render an <code>h1</code> element.
-    testString: 'assert(Enzyme.mount(React.createElement(Frameworks)).find("h1").length === 1, "<code>Frameworks</code> should render an <code>h1</code> element.");'
+    testString: assert(Enzyme.mount(React.createElement(Frameworks)).find('h1').length === 1, '<code>Frameworks</code> should render an <code>h1</code> element.');
   - text: <code>Frameworks</code> should render a <code>ul</code> element.
-    testString: 'assert(Enzyme.mount(React.createElement(Frameworks)).find("ul").length === 1, "<code>Frameworks</code> should render a <code>ul</code> element.");'
+    testString: assert(Enzyme.mount(React.createElement(Frameworks)).find('ul').length === 1, '<code>Frameworks</code> should render a <code>ul</code> element.');
   - text: The <code>ul</code> tag should render 6 child <code>li</code> elements.
-    testString: 'assert(Enzyme.mount(React.createElement(Frameworks)).find("ul").children().length === 6 && Enzyme.mount(React.createElement(Frameworks)).find("ul").childAt(0).name() === "li" && Enzyme.mount(React.createElement(Frameworks)).find("li").length === 6, "The <code>ul</code> tag should render 6 child <code>li</code> elements.");'
+    testString: assert(Enzyme.mount(React.createElement(Frameworks)).find('ul').children().length === 6 && Enzyme.mount(React.createElement(Frameworks)).find('ul').childAt(0).name() === 'li' && Enzyme.mount(React.createElement(Frameworks)).find('li').length === 6, 'The <code>ul</code> tag should render 6 child <code>li</code> elements.');
   - text: Each list item element should have a unique <code>key</code> attribute.
-    testString: 'assert((() => { const ul = Enzyme.mount(React.createElement(Frameworks)).find("ul"); const keys = new Set([ ul.childAt(0).key(), ul.childAt(1).key(), ul.childAt(2).key(), ul.childAt(3).key(), ul.childAt(4).key(), ul.childAt(5).key(), ]); return keys.size === 6; })(), "Each list item element should have a unique <code>key</code> attribute.");'
+    testString: assert((() => { const ul = Enzyme.mount(React.createElement(Frameworks)).find('ul'); const keys = new Set([ ul.childAt(0).key(), ul.childAt(1).key(), ul.childAt(2).key(), ul.childAt(3).key(), ul.childAt(4).key(), ul.childAt(5).key(), ]); return keys.size === 6; })(), 'Each list item element should have a unique <code>key</code> attribute.');
 
 ```
 
@@ -72,7 +72,7 @@ function Frameworks() {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Frameworks />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/introducing-inline-styles.english.md b/curriculum/challenges/english/03-front-end-libraries/react/introducing-inline-styles.english.md
index 2fcfd17d60..b9aa8c369f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/introducing-inline-styles.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/introducing-inline-styles.english.md
@@ -28,11 +28,11 @@ Note that you can optionally set the font size to be a number, omitting the unit
 ```yml
 tests:
   - text: The component should render a <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return mockedComponent.children().type() === "div"; })(), "The component should render a <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return mockedComponent.children().type() === 'div'; })(), 'The component should render a <code>div</code> element.');
   - text: The <code>div</code> element should have a color of <code>red</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return mockedComponent.children().props().style.color === "red"; })(), "The <code>div</code> element should have a color of <code>red</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return mockedComponent.children().props().style.color === 'red'; })(), 'The <code>div</code> element should have a color of <code>red</code>.');
   - text: The <code>div</code> element should have a font size of <code>72px</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return (mockedComponent.children().props().style.fontSize === 72 || mockedComponent.children().props().style.fontSize === "72" || mockedComponent.children().props().style.fontSize === "72px"); })(), "The <code>div</code> element should have a font size of <code>72px</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return (mockedComponent.children().props().style.fontSize === 72 || mockedComponent.children().props().style.fontSize === '72' || mockedComponent.children().props().style.fontSize === '72px'); })(), 'The <code>div</code> element should have a font size of <code>72px</code>.');
 
 ```
 
@@ -62,7 +62,7 @@ class Colorful extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Colorful />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.english.md b/curriculum/challenges/english/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.english.md
index 1e95e717d3..667043cc3c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.english.md
@@ -25,11 +25,11 @@ Fix the errors in the code editor so that it is valid JSX and successfully trans
 ```yml
 tests:
   - text: The constant <code>JSX</code> should return a <code>div</code> element.
-    testString: 'assert.strictEqual(JSX.type, "div", "The constant <code>JSX</code> should return a <code>div</code> element.");'
+    testString: assert.strictEqual(JSX.type, 'div', 'The constant <code>JSX</code> should return a <code>div</code> element.');
   - text: The <code>div</code> should contain a <code>br</code> tag.
-    testString: 'assert(Enzyme.shallow(JSX).find("br").length === 1, "The <code>div</code> should contain a <code>br</code> tag.");'
+    testString: assert(Enzyme.shallow(JSX).find('br').length === 1, 'The <code>div</code> should contain a <code>br</code> tag.');
   - text: The <code>div</code> should contain an <code>hr</code> tag.
-    testString: 'assert(Enzyme.shallow(JSX).find("hr").length === 1, "The <code>div</code> should contain an <code>hr</code> tag.");'
+    testString: assert(Enzyme.shallow(JSX).find('hr').length === 1, 'The <code>div</code> should contain an <code>hr</code> tag.');
 
 ```
 
@@ -60,7 +60,7 @@ const JSX = (
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(JSX, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/manage-updates-with-lifecycle-methods.english.md b/curriculum/challenges/english/03-front-end-libraries/react/manage-updates-with-lifecycle-methods.english.md
index 4169b0210a..e72466af6d 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/manage-updates-with-lifecycle-methods.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/manage-updates-with-lifecycle-methods.english.md
@@ -24,13 +24,13 @@ Next, add <code>componentDidUpdate()</code> in the <code>Dialog</code> component
 ```yml
 tests:
   - text: The <code>Controller</code> component should render the <code>Dialog</code> component as a child.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Controller)); return mockedComponent.find("Controller").length === 1 && mockedComponent.find("Dialog").length === 1; })(), "The <code>Controller</code> component should render the <code>Dialog</code> component as a child.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Controller)); return mockedComponent.find('Controller').length === 1 && mockedComponent.find('Dialog').length === 1; })(), 'The <code>Controller</code> component should render the <code>Dialog</code> component as a child.');
   - text: The <code>componentWillReceiveProps</code> method in the <code>Dialog</code> component should log <code>this.props</code> to the console.
-    testString: 'assert((function() { const lifecycleChild = React.createElement(Dialog).type.prototype.componentWillReceiveProps.toString().replace(/ /g,""); return lifecycleChild.includes("console.log") && lifecycleChild.includes("this.props") })(), "The <code>componentWillReceiveProps</code> method in the <code>Dialog</code> component should log <code>this.props</code> to the console.");'
+    testString: assert((function() { const lifecycleChild = React.createElement(Dialog).type.prototype.componentWillReceiveProps.toString().replace(/ /g,''); return lifecycleChild.includes('console.log') && lifecycleChild.includes('this.props') })(), 'The <code>componentWillReceiveProps</code> method in the <code>Dialog</code> component should log <code>this.props</code> to the console.');
   - text: The <code>componentWillReceiveProps</code> method in the <code>Dialog</code> component should log <code>nextProps</code> to the console.
-    testString: 'assert((function() { const lifecycleChild = React.createElement(Dialog).type.prototype.componentWillReceiveProps.toString().replace(/ /g,""); const nextPropsAsParameterTest = /componentWillReceiveProps(| *?= *?)(\(|)nextProps(\)|)( *?=> *?{| *?{|{)/; const nextPropsInConsoleLogTest = /console\.log\(.*?nextProps\b.*?\)/; return ( lifecycleChild.includes("console.log") && nextPropsInConsoleLogTest.test(lifecycleChild) && nextPropsAsParameterTest.test(lifecycleChild) ); })(), "The <code>componentWillReceiveProps</code> method in the <code>Dialog</code> component should log <code>nextProps</code> to the console.");'
+    testString: assert((function() { const lifecycleChild = React.createElement(Dialog).type.prototype.componentWillReceiveProps.toString().replace(/ /g,''); const nextPropsAsParameterTest = /componentWillReceiveProps(| *?= *?)(\(|)nextProps(\)|)( *?=> *?{| *?{|{)/; const nextPropsInConsoleLogTest = /console\.log\(.*?nextProps\b.*?\)/; return ( lifecycleChild.includes('console.log') && nextPropsInConsoleLogTest.test(lifecycleChild) && nextPropsAsParameterTest.test(lifecycleChild) ); })(), 'The <code>componentWillReceiveProps</code> method in the <code>Dialog</code> component should log <code>nextProps</code> to the console.');
   - text: The <code>Dialog</code> component should call the <code>componentDidUpdate</code> method and log a message to the console.
-    testString: 'assert((function() { const lifecycleChild = React.createElement(Dialog).type.prototype.componentDidUpdate.toString().replace(/ /g,""); return lifecycleChild.length !== "undefined" && lifecycleChild.includes("console.log"); })(), "The <code>Dialog</code> component should call the <code>componentDidUpdate</code> method and log a message to the console.");'
+    testString: assert((function() { const lifecycleChild = React.createElement(Dialog).type.prototype.componentDidUpdate.toString().replace(/ /g,''); return lifecycleChild.length !== 'undefined' && lifecycleChild.includes('console.log'); })(), 'The <code>Dialog</code> component should call the <code>componentDidUpdate</code> method and log a message to the console.');
 
 ```
 
@@ -88,7 +88,7 @@ class Controller extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Controller />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.english.md b/curriculum/challenges/english/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.english.md
index ac4d25f91e..ba3974aa5a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.english.md
@@ -22,13 +22,13 @@ The <code>shouldComponentUpdate()</code> method is added in a component called <
 ```yml
 tests:
   - text: The <code>Controller</code> component should render the <code>OnlyEvens</code> component as a child.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(Controller)); return mockedComponent.find("Controller").length === 1 && mockedComponent.find("OnlyEvens").length === 1; })(), "The <code>Controller</code> component should render the <code>OnlyEvens</code> component as a child.");'
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(Controller)); return mockedComponent.find('Controller').length === 1 && mockedComponent.find('OnlyEvens').length === 1; })(), 'The <code>Controller</code> component should render the <code>OnlyEvens</code> component as a child.');
   - text: The <code>shouldComponentUpdate</code> method should be defined on the <code>OnlyEvens</code> component.
-    testString: 'assert((() => { const child = React.createElement(OnlyEvens).type.prototype.shouldComponentUpdate.toString().replace(/s/g,""); return child !== "undefined"; })(), "The <code>shouldComponentUpdate</code> method should be defined on the <code>OnlyEvens</code> component.");'
+    testString: assert((() => { const child = React.createElement(OnlyEvens).type.prototype.shouldComponentUpdate.toString().replace(/s/g,''); return child !== 'undefined'; })(), 'The <code>shouldComponentUpdate</code> method should be defined on the <code>OnlyEvens</code> component.');
   - text: The <code>OnlyEvens</code> component should return an <code>h1</code> tag which renders the value of <code>this.props.value</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Controller)); const first = () => { mockedComponent.setState({ value: 1000 }); return waitForIt(() => mockedComponent.find("h1").html()); }; const second = () => { mockedComponent.setState({ value: 10 }); return waitForIt(() => mockedComponent.find("h1").html()); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === "<h1>1000</h1>" && secondValue === "<h1>10</h1>", "The <code>OnlyEvens</code> component should return an <code>h1</code> tag which renders the value of <code>this.props.value</code>."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Controller)); const first = () => { mockedComponent.setState({ value: 1000 }); return waitForIt(() => mockedComponent.find(''h1'').html()); }; const second = () => { mockedComponent.setState({ value: 10 }); return waitForIt(() => mockedComponent.find(''h1'').html()); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === ''<h1>1000</h1>'' && secondValue === ''<h1>10</h1>'', ''The <code>OnlyEvens</code> component should return an <code>h1</code> tag which renders the value of <code>this.props.value</code>.''); }; '
   - text: <code>OnlyEvens</code> should re-render only when <code>nextProps.value</code> is even.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Controller)); const first = () => { mockedComponent.setState({ value: 8 }); return waitForIt(() => mockedComponent.find("h1").text()); }; const second = () => { mockedComponent.setState({ value: 7 }); return waitForIt(() => mockedComponent.find("h1").text()); }; const third = () => { mockedComponent.setState({ value: 42 }); return waitForIt(() => mockedComponent.find("h1").text()); }; const firstValue = await first(); const secondValue = await second(); const thirdValue = await third(); assert(firstValue === "8" && secondValue === "8" && thirdValue === "42", "<code>OnlyEvens</code> should re-render only when <code>nextProps.value</code> is even."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Controller)); const first = () => { mockedComponent.setState({ value: 8 }); return waitForIt(() => mockedComponent.find(''h1'').text()); }; const second = () => { mockedComponent.setState({ value: 7 }); return waitForIt(() => mockedComponent.find(''h1'').text()); }; const third = () => { mockedComponent.setState({ value: 42 }); return waitForIt(() => mockedComponent.find(''h1'').text()); }; const firstValue = await first(); const secondValue = await second(); const thirdValue = await third(); assert(firstValue === ''8'' && secondValue === ''8'' && thirdValue === ''42'', ''<code>OnlyEvens</code> should re-render only when <code>nextProps.value</code> is even.''); }; '
 
 ```
 
@@ -92,7 +92,7 @@ class Controller extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Controller />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/override-default-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react/override-default-props.english.md
index 6c01ee8ee3..22b6c9b8e9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/override-default-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/override-default-props.english.md
@@ -22,11 +22,11 @@ The <code>ShoppingCart</code> component now renders a child component <code>Item
 ```yml
 tests:
   - text: The component <code>ShoppingCart</code> should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find("ShoppingCart").length === 1; })(), "The component <code>ShoppingCart</code> should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find('ShoppingCart').length === 1; })(), 'The component <code>ShoppingCart</code> should render.');
   - text: The component <code>Items</code> should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find("Items").length === 1; })(), "The component <code>Items</code> should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find('Items').length === 1; })(), 'The component <code>Items</code> should render.');
   - text: 'The <code>Items</code> component should have a prop of <code>{ quantity: 10 }</code> passed from the <code>ShoppingCart</code> component.'
-    testString: 'getUserInput => assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find("Items").props().quantity == 10 && getUserInput("index").replace(/ /g,"").includes("<Itemsquantity={10}/>"); })(), "The <code>Items</code> component should have a prop of <code>{ quantity: 10 }</code> passed from the <code>ShoppingCart</code> component.");'
+    testString: 'getUserInput => assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find(''Items'').props().quantity == 10 && getUserInput(''index'').replace(/ /g,'').includes(''<Itemsquantity={10}/>''); })(), ''The <code>Items</code> component should have a prop of <code>{ quantity: 10 }</code> passed from the <code>ShoppingCart</code> component.'');'
 
 ```
 
@@ -65,7 +65,7 @@ class ShoppingCart extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ShoppingCart />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/pass-a-callback-as-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react/pass-a-callback-as-props.english.md
index 9539a1df84..43ae54a0e2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/pass-a-callback-as-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/pass-a-callback-as-props.english.md
@@ -22,15 +22,15 @@ Next, add <code>RenderInput</code> to the render method in <code>MyApp</code>, t
 ```yml
 tests:
   - text: The <code>MyApp</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find("MyApp").length === 1; })(), "The <code>MyApp</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find('MyApp').length === 1; })(), 'The <code>MyApp</code> component should render.');
   - text: The <code>GetInput</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find("GetInput").length === 1; })(), "The <code>GetInput</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find('GetInput').length === 1; })(), 'The <code>GetInput</code> component should render.');
   - text: The <code>RenderInput</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find("RenderInput").length === 1; })(), "The <code>RenderInput</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find('RenderInput').length === 1; })(), 'The <code>RenderInput</code> component should render.');
   - text: The <code>GetInput</code> component should receive the <code>MyApp</code> state property <code>inputValue</code> as props and contain an <code>input</code> element which modifies <code>MyApp</code> state.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const state_1 = () => { mockedComponent.setState({inputValue: ""}); return waitForIt(() => mockedComponent.state() )}; const state_2 = () => { mockedComponent.find("input").simulate("change", {target: {value: "TestInput"}}); return waitForIt(() => mockedComponent.state() )}; const updated_1 = await state_1(); const updated_2 = await state_2(); assert(updated_1.inputValue === "" && updated_2.inputValue === "TestInput", "The <code>GetInput</code> component should receive the <code>MyApp</code> state property <code>inputValue</code> as props and contain an <code>input</code> element which modifies <code>MyApp</code> state."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const state_1 = () => { mockedComponent.setState({inputValue: ''''}); return waitForIt(() => mockedComponent.state() )}; const state_2 = () => { mockedComponent.find(''input'').simulate(''change'', {target: {value: ''TestInput''}}); return waitForIt(() => mockedComponent.state() )}; const updated_1 = await state_1(); const updated_2 = await state_2(); assert(updated_1.inputValue === '''' && updated_2.inputValue === ''TestInput'', ''The <code>GetInput</code> component should receive the <code>MyApp</code> state property <code>inputValue</code> as props and contain an <code>input</code> element which modifies <code>MyApp</code> state.''); }; '
   - text: The <code>RenderInput</code> component should receive the <code>MyApp</code> state property <code>inputValue</code> as props.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const state_1 = () => { mockedComponent.setState({inputValue: "TestName"}); return waitForIt(() => mockedComponent )}; const updated_1 = await state_1(); assert(updated_1.find("p").text().includes("TestName"), "The <code>RenderInput</code> component should receive the <code>MyApp</code> state property <code>inputValue</code> as props."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const state_1 = () => { mockedComponent.setState({inputValue: ''TestName''}); return waitForIt(() => mockedComponent )}; const updated_1 = await state_1(); assert(updated_1.find(''p'').text().includes(''TestName''), ''The <code>RenderInput</code> component should receive the <code>MyApp</code> state property <code>inputValue</code> as props.''); }; '
 
 ```
 
@@ -46,7 +46,7 @@ class MyApp extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      inputValue: "
+      inputValue: ''
     }
     this.handleChange = this.handleChange.bind(this);
   }
@@ -104,7 +104,7 @@ class RenderInput extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyApp />, document.getElementById('root'))
 ```
 
 </div>
@@ -120,7 +120,7 @@ class MyApp extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      inputValue: "
+      inputValue: ''
     }
   this.handleChange = this.handleChange.bind(this);
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/pass-an-array-as-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react/pass-an-array-as-props.english.md
index a3fce5a1bd..83f668f59b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/pass-an-array-as-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/pass-an-array-as-props.english.md
@@ -27,19 +27,19 @@ There are <code>List</code> and <code>ToDo</code> components in the code editor.
 ```yml
 tests:
   - text: The <code>ToDo</code> component should return a single outer <code>div</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.children().first().type() === "div"; })(), "The <code>ToDo</code> component should return a single outer <code>div</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.children().first().type() === 'div'; })(), 'The <code>ToDo</code> component should return a single outer <code>div</code>.');
   - text: The third child of the <code>ToDo</code> component should be an instance of the <code>List</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.children().first().childAt(2).name() === "List"; })(), "The third child of the <code>ToDo</code> component should be an instance of the <code>List</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.children().first().childAt(2).name() === 'List'; })(), 'The third child of the <code>ToDo</code> component should be an instance of the <code>List</code> component.');
   - text: The fifth child of the <code>ToDo</code> component should be an instance of the <code>List</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.children().first().childAt(4).name() === "List"; })(), "The fifth child of the <code>ToDo</code> component should be an instance of the <code>List</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.children().first().childAt(4).name() === 'List'; })(), 'The fifth child of the <code>ToDo</code> component should be an instance of the <code>List</code> component.');
   - text: Both instances of the <code>List</code> component should have a property called <code>tasks</code> and <code>tasks</code> should be of type array.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return Array.isArray(mockedComponent.find("List").get(0).props.tasks) && Array.isArray(mockedComponent.find("List").get(1).props.tasks); })(), "Both instances of the <code>List</code> component should have a property called <code>tasks</code> and <code>tasks</code> should be of type array.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return Array.isArray(mockedComponent.find('List').get(0).props.tasks) && Array.isArray(mockedComponent.find('List').get(1).props.tasks); })(), 'Both instances of the <code>List</code> component should have a property called <code>tasks</code> and <code>tasks</code> should be of type array.');
   - text: The first <code>List</code> component representing the tasks for today should have 2 or more items.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.find("List").get(0).props.tasks.length >= 2; })(), "The first <code>List</code> component representing the tasks for today should have 2 or more items.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.find('List').get(0).props.tasks.length >= 2; })(), 'The first <code>List</code> component representing the tasks for today should have 2 or more items.');
   - text: The second <code>List</code> component representing the tasks for tomorrow should have 3 or more items.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.find("List").get(1).props.tasks.length >= 3; })(), "The second <code>List</code> component representing the tasks for tomorrow should have 3 or more items.");'
-  - text: The <code>List</code> component should render the value from the <code>tasks</code> prop in the <code>p</code> tag as a comma separated list, for example <code>walk dog, workout</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.find("p").get(0).props.children === mockedComponent.find("List").get(0).props.tasks.join(", ") && mockedComponent.find("p").get(1).props.children === mockedComponent.find("List").get(1).props.tasks.join(", "); })(), "The <code>List</code> component should render the value from the <code>tasks</code> prop in the <code>p</code> tag as a comma separated list, for example <code>walk dog, workout</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.find('List').get(1).props.tasks.length >= 3; })(), 'The second <code>List</code> component representing the tasks for tomorrow should have 3 or more items.');
+  - text: The <code>List</code> component should render the value from the <code>tasks</code> prop in the <code>p</code> tag.
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ToDo)); return mockedComponent.find('p').get(0).props.children === mockedComponent.find('List').get(0).props.tasks.join(', ') && mockedComponent.find('p').get(1).props.children === mockedComponent.find('List').get(1).props.tasks.join(', '); })(), 'The <code>List</code> component should render the value from the <code>tasks</code> prop in the <code>p</code> tag.');
 
 ```
 
@@ -84,7 +84,7 @@ class ToDo extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ToDo />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.english.md b/curriculum/challenges/english/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.english.md
index 4eb88dcbeb..75f9e97297 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.english.md
@@ -25,15 +25,15 @@ There are <code>Calendar</code> and <code>CurrentDate</code> components in the c
 ```yml
 tests:
   - text: The <code>Calendar</code> component should return a single <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().type() === "div"; })(), "The <code>Calendar</code> component should return a single <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().type() === 'div'; })(), 'The <code>Calendar</code> component should return a single <code>div</code> element.');
   - text: The second child of the <code>Calendar</code> component should be the <code>CurrentDate</code> component.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().childAt(1).name() === "CurrentDate"; })(), "The second child of the <code>Calendar</code> component should be the <code>CurrentDate</code> component.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().childAt(1).name() === 'CurrentDate'; })(), 'The second child of the <code>Calendar</code> component should be the <code>CurrentDate</code> component.');
   - text: The <code>CurrentDate</code> component should have a prop called <code>date</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().childAt(1).props().date })(), "The <code>CurrentDate</code> component should have a prop called <code>date</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.children().childAt(1).props().date })(), 'The <code>CurrentDate</code> component should have a prop called <code>date</code>.');
   - text: The <code>date</code> prop of the <code>CurrentDate</code> should contain a string of text.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); const prop = mockedComponent.children().childAt(1).props().date; return( typeof prop === "string" && prop.length > 0 ); })(), "The <code>date</code> prop of the <code>CurrentDate</code> should contain a string of text.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); const prop = mockedComponent.children().childAt(1).props().date; return( typeof prop === 'string' && prop.length > 0 ); })(), 'The <code>date</code> prop of the <code>CurrentDate</code> should contain a string of text.');
   - text: The <code>CurrentDate</code> component should render the value from the <code>date</code> prop in the <code>p</code> tag.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.find("p").html().includes(Date().substr(3)); })(), "The <code>CurrentDate</code> component should render the value from the <code>date</code> prop in the <code>p</code> tag.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Calendar)); return mockedComponent.find('p').html().includes(Date().substr(3)); })(), 'The <code>CurrentDate</code> component should render the value from the <code>date</code> prop in the <code>p</code> tag.');
 
 ```
 
@@ -80,7 +80,7 @@ class Calendar extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Calendar />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/pass-state-as-props-to-child-components.english.md b/curriculum/challenges/english/03-front-end-libraries/react/pass-state-as-props-to-child-components.english.md
index 249f17e94c..71260d5cc2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/pass-state-as-props-to-child-components.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/pass-state-as-props-to-child-components.english.md
@@ -23,11 +23,11 @@ The <code>MyApp</code> component is stateful and renders a <code>Navbar</code> c
 ```yml
 tests:
   - text: The <code>MyApp</code> component should render with a <code>Navbar</code> component inside.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find("MyApp").length === 1 && mockedComponent.find("Navbar").length === 1; })(), "The <code>MyApp</code> component should render with a <code>Navbar</code> component inside.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyApp)); return mockedComponent.find('MyApp').length === 1 && mockedComponent.find('Navbar').length === 1; })(), 'The <code>MyApp</code> component should render with a <code>Navbar</code> component inside.');
   - text: The <code>Navbar</code> component should receive the <code>MyApp</code> state property <code>name</code> as props.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const setState = () => { mockedComponent.setState({name: "TestName"}); return waitForIt(() => mockedComponent.find("Navbar").props() )}; const navProps = await setState(); assert(navProps.name === "TestName", "The <code>Navbar</code> component should receive the <code>MyApp</code> state property <code>name</code> as props."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const setState = () => { mockedComponent.setState({name: ''TestName''}); return waitForIt(() => mockedComponent.find(''Navbar'').props() )}; const navProps = await setState(); assert(navProps.name === ''TestName'', ''The <code>Navbar</code> component should receive the <code>MyApp</code> state property <code>name</code> as props.''); }; '
   - text: The <code>h1</code> element in <code>Navbar</code> should render the <code>name</code> prop.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const navH1Before = mockedComponent.find("Navbar").find("h1").text(); const setState = () => { mockedComponent.setState({name: "TestName"}); return waitForIt(() => mockedComponent.find("Navbar").find("h1").text() )}; const navH1After = await setState(); assert(new RegExp("TestName").test(navH1After) && navH1After !== navH1Before, "The <code>h1</code> element in <code>Navbar</code> should render the <code>name</code> prop."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyApp)); const navH1Before = mockedComponent.find(''Navbar'').find(''h1'').text(); const setState = () => { mockedComponent.setState({name: ''TestName''}); return waitForIt(() => mockedComponent.find(''Navbar'').find(''h1'').text() )}; const navH1After = await setState(); assert(new RegExp(''TestName'').test(navH1After) && navH1After !== navH1Before, ''The <code>h1</code> element in <code>Navbar</code> should render the <code>name</code> prop.''); }; '
 
 ```
 
@@ -76,7 +76,7 @@ class Navbar extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyApp />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-a-class-component-to-the-dom.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-a-class-component-to-the-dom.english.md
index e2751ba4f2..71dca3b00a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-a-class-component-to-the-dom.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-a-class-component-to-the-dom.english.md
@@ -23,13 +23,13 @@ Both the <code>Fruits</code> and <code>Vegetables</code> components are defined
 ```yml
 tests:
   - text: The <code>TypesOfFood</code> component should return a single <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().type() === "div"; })(), "The <code>TypesOfFood</code> component should return a single <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().type() === 'div'; })(), 'The <code>TypesOfFood</code> component should return a single <code>div</code> element.');
   - text: The <code>TypesOfFood</code> component should render the <code>Fruits</code> component after the <code>h1</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(1).name() === "Fruits"; })(), "The <code>TypesOfFood</code> component should render the <code>Fruits</code> component after the <code>h1</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(1).name() === 'Fruits'; })(), 'The <code>TypesOfFood</code> component should render the <code>Fruits</code> component after the <code>h1</code> element.');
   - text: The <code>TypesOfFood</code> component should render the <code>Vegetables</code> component after <code>Fruits</code>.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(2).name() === "Vegetables"; })(), "The <code>TypesOfFood</code> component should render the <code>Vegetables</code> component after <code>Fruits</code>.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(TypesOfFood)); return mockedComponent.children().childAt(2).name() === 'Vegetables'; })(), 'The <code>TypesOfFood</code> component should render the <code>Vegetables</code> component after <code>Fruits</code>.');
   - text: The <code>TypesOfFood</code> component should render to the DOM within the <code>div</code> with the id <code>challenge-node</code>.
-    testString: 'assert((function() { const html = document.getElementById("challenge-node").childNodes[0].innerHTML; return (html === "<h1>Types of Food:</h1><div><h2>Fruits:</h2><h4>Non-Citrus:</h4><ul><li>Apples</li><li>Blueberries</li><li>Strawberries</li><li>Bananas</li></ul><h4>Citrus:</h4><ul><li>Lemon</li><li>Lime</li><li>Orange</li><li>Grapefruit</li></ul></div><div><h2>Vegetables:</h2><ul><li>Brussel Sprouts</li><li>Broccoli</li><li>Squash</li></ul></div>"); })(), "The <code>TypesOfFood</code> component should render to the DOM within the <code>div</code> with the id <code>challenge-node</code>.");'
+    testString: assert((function() { const html = document.getElementById('challenge-node').childNodes[0].innerHTML; return (html === '<h1>Types of Food:</h1><div><h2>Fruits:</h2><h4>Non-Citrus:</h4><ul><li>Apples</li><li>Blueberries</li><li>Strawberries</li><li>Bananas</li></ul><h4>Citrus:</h4><ul><li>Lemon</li><li>Lime</li><li>Orange</li><li>Grapefruit</li></ul></div><div><h2>Vegetables:</h2><ul><li>Brussel Sprouts</li><li>Broccoli</li><li>Squash</li></ul></div>'); })(), 'The <code>TypesOfFood</code> component should render to the DOM within the <code>div</code> with the id <code>challenge-node</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-conditionally-from-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-conditionally-from-props.english.md
index a1a943a214..44b8d35423 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-conditionally-from-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-conditionally-from-props.english.md
@@ -24,19 +24,19 @@ Now you have an expression that you can use to make a randomized decision in the
 ```yml
 tests:
   - text: The <code>GameOfChance</code> component should exist and render to the page.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).find("GameOfChance").length, 1, "The <code>GameOfChance</code> component should exist and render to the page.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).find('GameOfChance').length, 1, 'The <code>GameOfChance</code> component should exist and render to the page.');
   - text: <code>GameOfChance</code> should return a single <code>button</code> element.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).find("button").length, 1, "<code>GameOfChance</code> should return a single <code>button</code> element.");'
-  - text: '<code>GameOfChance</code> should return a single instance of the <code>Results</code> component, which has a prop called <code>fiftyFifty</code>.'
-    testString: 'assert(Enzyme.mount(React.createElement(GameOfChance)).find("Results").length === 1 && Enzyme.mount(React.createElement(GameOfChance)).find("Results").props().hasOwnProperty("fiftyFifty") === true, "<code>GameOfChance</code> should return a single instance of the <code>Results</code> component, which has a prop called <code>fiftyFifty</code>.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).find('button').length, 1, '<code>GameOfChance</code> should return a single <code>button</code> element.');
+  - text: <code>GameOfChance</code> should return a single instance of the <code>Results</code> component, which has a prop called <code>fiftyFifty</code>.
+    testString: assert(Enzyme.mount(React.createElement(GameOfChance)).find('Results').length === 1 && Enzyme.mount(React.createElement(GameOfChance)).find('Results').props().hasOwnProperty('fiftyFifty') === true, '<code>GameOfChance</code> should return a single instance of the <code>Results</code> component, which has a prop called <code>fiftyFifty</code>.');
   - text: <code>GameOfChance</code> state should be initialized with a property of <code>counter</code> set to a value of <code>1</code>.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).state().counter, 1, "<code>GameOfChance</code> state should be initialized with a property of <code>counter</code> set to a value of <code>1</code>.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).state().counter, 1, '<code>GameOfChance</code> state should be initialized with a property of <code>counter</code> set to a value of <code>1</code>.');
   - text: 'When the <code>GameOfChance</code> component is first rendered to the DOM, a <code>p</code> element should be returned with the inner text of <code>Turn: 1</code>.'
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).find("p").text(), "Turn: 1", "When the <code>GameOfChance</code> component is first rendered to the DOM, a <code>p</code> element should be returned with the inner text of <code>Turn: 1</code>.");'
+    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(GameOfChance)).find(''p'').text(), ''Turn: 1'', ''When the <code>GameOfChance</code> component is first rendered to the DOM, a <code>p</code> element should be returned with the inner text of <code>Turn: 1</code>.'');'
   - text: 'Each time the button is clicked, the counter state should be incremented by a value of 1, and a single <code>p</code> element should be rendered to the DOM that contains the text "Turn: N", where N is the value of the counter state.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(GameOfChance)); const simulate = () => { comp.find("button").simulate("click"); };const result = () => ({ count: comp.state("counter"), text: comp.find("p").text() });const _1 = () => { simulate(); return waitForIt(() => result())}; const _2 = () => { simulate(); return waitForIt(() => result())}; const _3 = () => { simulate(); return waitForIt(() => result())}; const _4 = () => { simulate(); return waitForIt(() => result())}; const _5 = () => { simulate(); return waitForIt(() => result())}; const _1_val = await _1(); const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); const _5_val = await _5(); assert(_1_val.count === 2 && _1_val.text === "Turn: 2" && _2_val.count === 3 && _2_val.text === "Turn: 3" && _3_val.count === 4 && _3_val.text === "Turn: 4" && _4_val.count === 5 && _4_val.text === "Turn: 5" && _5_val.count === 6 && _5_val.text === "Turn: 6", "Each time the button is clicked, the counter state should be incremented by a value of 1, and a single <code>p</code> element should be rendered to the DOM that contains the text "Turn: N", where N is the value of the counter state."); }; '
-  - text: 'When the <code>GameOfChance</code> component is first mounted to the DOM and each time the button is clicked thereafter, a single <code>h1</code> element should be returned that randomly renders either <code>You Win!</code> or <code>You Lose!</code>.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(GameOfChance)); const simulate = () => { comp.find("button").simulate("click"); };const result = () => ({ h1: comp.find("h1").length, text: comp.find("h1").text() });const _1 = result(); const _2 = () => { simulate(); return waitForIt(() => result())}; const _3 = () => { simulate(); return waitForIt(() => result())}; const _4 = () => { simulate(); return waitForIt(() => result())}; const _5 = () => { simulate(); return waitForIt(() => result())}; const _6 = () => { simulate(); return waitForIt(() => result())}; const _7 = () => { simulate(); return waitForIt(() => result())}; const _8 = () => { simulate(); return waitForIt(() => result())}; const _9 = () => { simulate(); return waitForIt(() => result())}; const _10 = () => { simulate(); return waitForIt(() => result())}; const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); const _5_val = await _5(); const _6_val = await _6(); const _7_val = await _7(); const _8_val = await _8(); const _9_val = await _9(); const _10_val = await _10(); const __text = new Set([_1.text, _2_val.text, _3_val.text, _4_val.text, _5_val.text, _6_val.text, _7_val.text, _8_val.text, _9_val.text, _10_val.text]); const __h1 = new Set([_1.h1, _2_val.h1, _3_val.h1, _4_val.h1, _5_val.h1, _6_val.h1, _7_val.h1, _8_val.h1, _9_val.h1, _10_val.h1]); assert(__text.size === 2 && __h1.size === 1, "When the <code>GameOfChance</code> component is first mounted to the DOM and each time the button is clicked thereafter, a single <code>h1</code> element should be returned that randomly renders either <code>You Win!</code> or <code>You Lose!</code>."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(GameOfChance)); const simulate = () => { comp.find(''button'').simulate(''click''); };const result = () => ({ count: comp.state(''counter''), text: comp.find(''p'').text() });const _1 = () => { simulate(); return waitForIt(() => result())}; const _2 = () => { simulate(); return waitForIt(() => result())}; const _3 = () => { simulate(); return waitForIt(() => result())}; const _4 = () => { simulate(); return waitForIt(() => result())}; const _5 = () => { simulate(); return waitForIt(() => result())}; const _1_val = await _1(); const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); const _5_val = await _5(); assert(_1_val.count === 2 && _1_val.text === ''Turn: 2'' && _2_val.count === 3 && _2_val.text === ''Turn: 3'' && _3_val.count === 4 && _3_val.text === ''Turn: 4'' && _4_val.count === 5 && _4_val.text === ''Turn: 5'' && _5_val.count === 6 && _5_val.text === ''Turn: 6'', ''Each time the button is clicked, the counter state should be incremented by a value of 1, and a single <code>p</code> element should be rendered to the DOM that contains the text "Turn: N", where N is the value of the counter state.''); }; '
+  - text: When the <code>GameOfChance</code> component is first mounted to the DOM and each time the button is clicked thereafter, a single <code>h1</code> element should be returned that randomly renders either <code>You Win!</code> or <code>You Lose!</code>.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(GameOfChance)); const simulate = () => { comp.find(''button'').simulate(''click''); };const result = () => ({ h1: comp.find(''h1'').length, text: comp.find(''h1'').text() });const _1 = result(); const _2 = () => { simulate(); return waitForIt(() => result())}; const _3 = () => { simulate(); return waitForIt(() => result())}; const _4 = () => { simulate(); return waitForIt(() => result())}; const _5 = () => { simulate(); return waitForIt(() => result())}; const _6 = () => { simulate(); return waitForIt(() => result())}; const _7 = () => { simulate(); return waitForIt(() => result())}; const _8 = () => { simulate(); return waitForIt(() => result())}; const _9 = () => { simulate(); return waitForIt(() => result())}; const _10 = () => { simulate(); return waitForIt(() => result())}; const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); const _5_val = await _5(); const _6_val = await _6(); const _7_val = await _7(); const _8_val = await _8(); const _9_val = await _9(); const _10_val = await _10(); const __text = new Set([_1.text, _2_val.text, _3_val.text, _4_val.text, _5_val.text, _6_val.text, _7_val.text, _8_val.text, _9_val.text, _10_val.text]); const __h1 = new Set([_1.h1, _2_val.h1, _3_val.h1, _4_val.h1, _5_val.h1, _6_val.h1, _7_val.h1, _8_val.h1, _9_val.h1, _10_val.h1]); assert(__text.size === 2 && __h1.size === 1, ''When the <code>GameOfChance</code> component is first mounted to the DOM and each time the button is clicked thereafter, a single <code>h1</code> element should be returned that randomly renders either <code>You Win!</code> or <code>You Lose!</code>.''); }; '
 
 ```
 
@@ -98,7 +98,7 @@ class GameOfChance extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<GameOfChance />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-html-elements-to-the-dom.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-html-elements-to-the-dom.english.md
index 8dbcabadeb..c45a43e352 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-html-elements-to-the-dom.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-html-elements-to-the-dom.english.md
@@ -23,13 +23,13 @@ The code editor has a simple JSX component. Use the <code>ReactDOM.render()</cod
 ```yml
 tests:
   - text: The constant <code>JSX</code> should return a <code>div</code> element.
-    testString: 'assert(JSX.type === "div", "The constant <code>JSX</code> should return a <code>div</code> element.");'
+    testString: assert(JSX.type === 'div', 'The constant <code>JSX</code> should return a <code>div</code> element.');
   - text: The <code>div</code> should contain an <code>h1</code> tag as the first element.
-    testString: 'assert(JSX.props.children[0].type === "h1", "The <code>div</code> should contain an <code>h1</code> tag as the first element.");'
+    testString: assert(JSX.props.children[0].type === 'h1', 'The <code>div</code> should contain an <code>h1</code> tag as the first element.');
   - text: The <code>div</code> should contain a <code>p</code> tag as the second element.
-    testString: 'assert(JSX.props.children[1].type === "p", "The <code>div</code> should contain a <code>p</code> tag as the second element.");'
+    testString: assert(JSX.props.children[1].type === 'p', 'The <code>div</code> should contain a <code>p</code> tag as the second element.');
   - text: The provided JSX element should render to the DOM node with id <code>challenge-node</code>.
-    testString: 'assert(document.getElementById("challenge-node").childNodes[0].innerHTML === "<h1>Hello World</h1><p>Lets render this to the DOM</p>", "The provided JSX element should render to the DOM node with id <code>challenge-node</code>.");'
+    testString: assert(document.getElementById('challenge-node').childNodes[0].innerHTML === '<h1>Hello World</h1><p>Lets render this to the DOM</p>', 'The provided JSX element should render to the DOM node with id <code>challenge-node</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.english.md
index 116b1acf24..4b8385d188 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.english.md
@@ -22,7 +22,7 @@ The <code>renderToString()</code> method is provided on <code>ReactDOMServer</co
 ```yml
 tests:
   - text: The <code>App</code> component should render to a string using <code>ReactDOMServer.renderToString</code>.
-    testString: 'getUserInput => assert(getUserInput("index").replace(/ /g,"").includes("ReactDOMServer.renderToString(<App/>)") && Enzyme.mount(React.createElement(App)).children().name() === "div", "The <code>App</code> component should render to a string using <code>ReactDOMServer.renderToString</code>.");'
+    testString: getUserInput => assert(getUserInput('index').replace(/ /g,').includes('ReactDOMServer.renderToString(<App/>)') && Enzyme.mount(React.createElement(App)).children().name() === 'div', 'The <code>App</code> component should render to a string using <code>ReactDOMServer.renderToString</code>.');
 
 ```
 
@@ -63,7 +63,7 @@ var ReactDOMServer = { renderToString(x) { return null; } };
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<App />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.english.md
index b75149b88a..78c4bba231 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.english.md
@@ -22,13 +22,13 @@ Next, in the return statement, render this value in an <code>h1</code> tag using
 ```yml
 tests:
   - text: <code>MyComponent</code> should have a key <code>name</code> with value <code>freeCodeCamp</code> stored in its state.
-    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).state("name") === "freeCodeCamp", "<code>MyComponent</code> should have a key <code>name</code> with value <code>freeCodeCamp</code> stored in its state.");'
+    testString: assert(Enzyme.mount(React.createElement(MyComponent)).state('name') === 'freeCodeCamp', '<code>MyComponent</code> should have a key <code>name</code> with value <code>freeCodeCamp</code> stored in its state.');
   - text: <code>MyComponent</code> should render an <code>h1</code> header enclosed in a single <code>div</code>.
-    testString: 'assert(/<div><h1>.*<\/h1><\/div>/.test(Enzyme.mount(React.createElement(MyComponent)).html()), "<code>MyComponent</code> should render an <code>h1</code> header enclosed in a single <code>div</code>.");'
-  - text: 'The rendered <code>h1</code> tag should include a reference to <code>{name}</code>.'
-    testString: 'getUserInput => assert(/<h1>\n*\s*\{\s*name\s*\}\s*\n*<\/h1>/.test(getUserInput("index")), "The rendered <code>h1</code> tag should include a reference to <code>{name}</code>.");'
+    testString: assert(/<div><h1>.*<\/h1><\/div>/.test(Enzyme.mount(React.createElement(MyComponent)).html()), '<code>MyComponent</code> should render an <code>h1</code> header enclosed in a single <code>div</code>.');
+  - text: The rendered <code>h1</code> tag should include a reference to <code>{name}</code>.
+    testString: getUserInput => assert(/<h1>\n*\s*\{\s*name\s*\}\s*\n*<\/h1>/.test(getUserInput('index')), 'The rendered <code>h1</code> tag should include a reference to <code>{name}</code>.');
   - text: The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: "TestName" });   return waitForIt(() => mockedComponent.html()) }; const firstValue = await first(); assert(firstValue === "<div><h1>TestName</h1></div>", "The rendered <code>h1</code> header should contain text rendered from the component&apos;s state."); };'
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: ''TestName'' });   return waitForIt(() => mockedComponent.html()) }; const firstValue = await first(); assert(firstValue === ''<div><h1>TestName</h1></div>'', ''The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.''); };'
 
 ```
 
@@ -69,7 +69,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface.english.md
index 5c204daebd..0dd88e387f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-state-in-the-user-interface.english.md
@@ -25,11 +25,11 @@ In the code editor, <code>MyComponent</code> is already stateful. Define an <cod
 ```yml
 tests:
   - text: <code>MyComponent</code> should have a key <code>name</code> with value <code>freeCodeCamp</code> stored in its state.
-    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).state("name") === "freeCodeCamp", "<code>MyComponent</code> should have a key <code>name</code> with value <code>freeCodeCamp</code> stored in its state.");'
+    testString: assert(Enzyme.mount(React.createElement(MyComponent)).state('name') === 'freeCodeCamp', '<code>MyComponent</code> should have a key <code>name</code> with value <code>freeCodeCamp</code> stored in its state.');
   - text: <code>MyComponent</code> should render an <code>h1</code> header enclosed in a single <code>div</code>.
-    testString: 'assert(/<div><h1>.*<\/h1><\/div>/.test(Enzyme.mount(React.createElement(MyComponent)).html()), "<code>MyComponent</code> should render an <code>h1</code> header enclosed in a single <code>div</code>.");'
+    testString: assert(/<div><h1>.*<\/h1><\/div>/.test(Enzyme.mount(React.createElement(MyComponent)).html()), '<code>MyComponent</code> should render an <code>h1</code> header enclosed in a single <code>div</code>.');
   - text: The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: "TestName" });   return waitForIt(() => mockedComponent.html()) }; const firstValue = await first(); assert(firstValue === "<div><h1>TestName</h1></div>", "The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.");};'
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: ''TestName'' });   return waitForIt(() => mockedComponent.html()) }; const firstValue = await first(); assert(firstValue === ''<div><h1>TestName</h1></div>'', ''The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.'');};'
 
 ```
 
@@ -67,7 +67,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/render-with-an-if-else-condition.english.md b/curriculum/challenges/english/03-front-end-libraries/react/render-with-an-if-else-condition.english.md
index 6a8cbebbbe..51dd94ee58 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/render-with-an-if-else-condition.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/render-with-an-if-else-condition.english.md
@@ -22,13 +22,13 @@ MyComponent contains a <code>boolean</code> in its state which tracks whether yo
 ```yml
 tests:
   - text: <code>MyComponent</code> should exist and render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("MyComponent").length === 1; })(), "<code>MyComponent</code> should exist and render.");'
-  - text: 'When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: true}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(mockedComponent.find("div").length === 1 && mockedComponent.find("div").children().length === 2 && mockedComponent.find("button").length === 1 && mockedComponent.find("h1").length === 1, "When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render."); }; '
-  - text: 'When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: false}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(mockedComponent.find("div").length === 1 && mockedComponent.find("div").children().length === 1 && mockedComponent.find("button").length === 1 && mockedComponent.find("h1").length === 0, "When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render."); }; '
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find('MyComponent').length === 1; })(), '<code>MyComponent</code> should exist and render.');
+  - text: When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: true}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(mockedComponent.find(''div'').length === 1 && mockedComponent.find(''div'').children().length === 2 && mockedComponent.find(''button'').length === 1 && mockedComponent.find(''h1'').length === 1, ''When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render.''); }; '
+  - text: When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: false}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(mockedComponent.find(''div'').length === 1 && mockedComponent.find(''div'').children().length === 1 && mockedComponent.find(''button'').length === 1 && mockedComponent.find(''h1'').length === 0, ''When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render.''); }; '
   - text: The render method should use an <code>if/else</code> statement to check the condition of <code>this.state.display</code>.
-    testString: 'getUserInput => assert(getUserInput("index").includes("if") && getUserInput("index").includes("else"), "The render method should use an <code>if/else</code> statement to check the condition of <code>this.state.display</code>.");'
+    testString: getUserInput => assert(getUserInput('index').includes('if') && getUserInput('index').includes('else'), 'The render method should use an <code>if/else</code> statement to check the condition of <code>this.state.display</code>.');
 
 ```
 
@@ -73,7 +73,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.english.md b/curriculum/challenges/english/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.english.md
index 6126ccbdd8..eaa11f5a7f 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.english.md
@@ -23,15 +23,15 @@ The code editor has a <code>CampSite</code> component that renders a <code>Campe
 ```yml
 tests:
   - text: The <code>CampSite</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); return mockedComponent.find("CampSite").length === 1; })(), "The <code>CampSite</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); return mockedComponent.find('CampSite').length === 1; })(), 'The <code>CampSite</code> component should render.');
   - text: The <code>Camper</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); return mockedComponent.find("Camper").length === 1; })(), "The <code>Camper</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); return mockedComponent.find('Camper').length === 1; })(), 'The <code>Camper</code> component should render.');
   - text: The <code>Camper</code> component should include default props which assign the string <code>CamperBot</code> to the key <code>name</code>.
-    testString: 'getUserInput => assert((function() { const noWhiteSpace = getUserInput("index").replace(/\s/g, ""); const verify1 = "Camper.defaultProps={name:\"CamperBot\"}"; const verify2 = "Camper.defaultProps={name:"CamperBot"}"; return (noWhiteSpace.includes(verify1) || noWhiteSpace.includes(verify2)); })(), "The <code>Camper</code> component should include default props which assign the string <code>CamperBot</code> to the key <code>name</code>.");'
+    testString: getUserInput => assert((function() { const noWhiteSpace = getUserInput('index').replace(/\s/g, '); const verify1 = 'Camper.defaultProps={name:\'CamperBot\'}'; const verify2 = 'Camper.defaultProps={name:"CamperBot"}'; return (noWhiteSpace.includes(verify1) || noWhiteSpace.includes(verify2)); })(), 'The <code>Camper</code> component should include default props which assign the string <code>CamperBot</code> to the key <code>name</code>.');
   - text: The <code>Camper</code> component should include prop types which require the <code>name</code> prop to be of type <code>string</code>.
-    testString: 'getUserInput => assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); const noWhiteSpace = getUserInput("index").replace(/\s/g, ""); const verifyDefaultProps = "Camper.propTypes={name:PropTypes.string.isRequired}"; return noWhiteSpace.includes(verifyDefaultProps); })(), "The <code>Camper</code> component should include prop types which require the <code>name</code> prop to be of type <code>string</code>.");'
+    testString: getUserInput => assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); const noWhiteSpace = getUserInput('index').replace(/\s/g, '); const verifyDefaultProps = 'Camper.propTypes={name:PropTypes.string.isRequired}'; return noWhiteSpace.includes(verifyDefaultProps); })(), 'The <code>Camper</code> component should include prop types which require the <code>name</code> prop to be of type <code>string</code>.');
   - text: The <code>Camper</code> component should contain a <code>p</code> element with only the text from the <code>name</code> prop.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); return mockedComponent.find("p").text() === mockedComponent.find("Camper").props().name; })(), "The <code>Camper</code> component should contain a <code>p</code> element with only the text from the <code>name</code> prop.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(CampSite)); return mockedComponent.find('p').text() === mockedComponent.find('Camper').props().name; })(), 'The <code>Camper</code> component should contain a <code>p</code> element with only the text from the <code>name</code> prop.');
 
 ```
 
@@ -76,7 +76,7 @@ var PropTypes = {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<CampSite />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/set-state-with-this.setstate.english.md b/curriculum/challenges/english/03-front-end-libraries/react/set-state-with-this.setstate.english.md
index 106a76e156..b80cd3accd 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/set-state-with-this.setstate.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/set-state-with-this.setstate.english.md
@@ -24,13 +24,13 @@ Click the button and watch the rendered state update. Don't worry if you don't f
 ```yml
 tests:
   - text: 'The state of <code>MyComponent</code> should initialize with the key value pair <code>{ name: Initial State }</code>.'
-    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).state("name") === "Initial State", "The state of <code>MyComponent</code> should initialize with the key value pair <code>{ name: Initial State }</code>.");'
+    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).state(''name'') === ''Initial State'', ''The state of <code>MyComponent</code> should initialize with the key value pair <code>{ name: Initial State }</code>.'');'
   - text: <code>MyComponent</code> should render an <code>h1</code> header.
-    testString: 'assert(Enzyme.mount(React.createElement(MyComponent)).find("h1").length === 1, "<code>MyComponent</code> should render an <code>h1</code> header.");'
+    testString: assert(Enzyme.mount(React.createElement(MyComponent)).find('h1').length === 1, '<code>MyComponent</code> should render an <code>h1</code> header.');
   - text: The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: "TestName" }); return waitForIt(() => mockedComponent.html()); }; const firstValue = await first(); assert(/<h1>TestName<\/h1>/.test(firstValue), "The rendered <code>h1</code> header should contain text rendered from the component&apos;s state."); };'
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: ''TestName'' }); return waitForIt(() => mockedComponent.html()); }; const firstValue = await first(); assert(/<h1>TestName<\/h1>/.test(firstValue), ''The rendered <code>h1</code> header should contain text rendered from the component&apos;s state.''); };'
   - text: Calling the <code>handleClick</code> method on <code>MyComponent</code> should set the name property in state to equal <code>React Rocks!</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: "Before" }); return waitForIt(() => mockedComponent.state("name")); }; const second = () => { mockedComponent.instance().handleClick(); return waitForIt(() => mockedComponent.state("name")); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === "Before" && secondValue === "React Rocks!", "Calling the <code>handleClick</code> method on <code>MyComponent</code> should set the name property in state to equal <code>React Rocks!</code>."); };'
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ name: ''Before'' }); return waitForIt(() => mockedComponent.state(''name'')); }; const second = () => { mockedComponent.instance().handleClick(); return waitForIt(() => mockedComponent.state(''name'')); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === ''Before'' && secondValue === ''React Rocks!'', ''Calling the <code>handleClick</code> method on <code>MyComponent</code> should set the name property in state to equal <code>React Rocks!</code>.''); };'
 
 ```
 
@@ -73,7 +73,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use--for-a-more-concise-conditional.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use--for-a-more-concise-conditional.english.md
index 9d96ab2a77..16ec9f1455 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use--for-a-more-concise-conditional.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use--for-a-more-concise-conditional.english.md
@@ -23,13 +23,13 @@ Solve the previous example again, so the <code>h1</code> only renders if <code>d
 ```yml
 tests:
   - text: <code>MyComponent</code> should exist and render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("MyComponent").length; })(), "<code>MyComponent</code> should exist and render.");'
-  - text: 'When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: true}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(updated.find("div").length === 1 && updated.find("div").children().length === 2 && updated.find("button").length === 1 && updated.find("h1").length === 1, "When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render."); }; '
-  - text: 'When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: false}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(updated.find("div").length === 1 && updated.find("div").children().length === 1 && updated.find("button").length === 1 && updated.find("h1").length === 0, "When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render."); }; '
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find('MyComponent').length; })(), '<code>MyComponent</code> should exist and render.');
+  - text: When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: true}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(updated.find(''div'').length === 1 && updated.find(''div'').children().length === 2 && updated.find(''button'').length === 1 && updated.find(''h1'').length === 1, ''When <code>display</code> is set to <code>true</code>, a <code>div</code>, <code>button</code>, and <code>h1</code> should render.''); }; '
+  - text: When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: false}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(updated.find(''div'').length === 1 && updated.find(''div'').children().length === 1 && updated.find(''button'').length === 1 && updated.find(''h1'').length === 0, ''When <code>display</code> is set to <code>false</code>, only a <code>div</code> and <code>button</code> should render.''); }; '
   - text: The render method should use the && logical operator to check the condition of this.state.display.
-    testString: 'getUserInput => assert(getUserInput("index").includes("&&"), "The render method should use the && logical operator to check the condition of this.state.display.");'
+    testString: getUserInput => assert(getUserInput('index').includes('&&'), 'The render method should use the && logical operator to check the condition of this.state.display.');
 
 ```
 
@@ -73,7 +73,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.english.md
index 039c63f017..447ef0aed1 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.english.md
@@ -23,19 +23,19 @@ Once the component is rendering information to the page, users should have a way
 ```yml
 tests:
   - text: The <code>CheckUserAge</code> component should render with a single <code>input</code> element and a single <code>button</code> element.
-    testString: 'assert(Enzyme.mount(React.createElement(CheckUserAge)).find("div").find("input").length === 1 && Enzyme.mount(React.createElement(CheckUserAge)).find("div").find("button").length === 1, "The <code>CheckUserAge</code> component should render with a single <code>input</code> element and a single <code>button</code> element.");'
-  - text: 'The <code>CheckUserAge</code> component&apos;s state should be initialized with a property of <code>userAge</code> and a property of <code>input</code>, both set to a value of an empty string.'
-    testString: 'assert(Enzyme.mount(React.createElement(CheckUserAge)).state().input === "" && Enzyme.mount(React.createElement(CheckUserAge)).state().userAge === "", "The <code>CheckUserAge</code> component&apos;s state should be initialized with a property of <code>userAge</code> and a property of <code>input</code>, both set to a value of an empty string.");'
-  - text: 'When the <code>CheckUserAge</code> component is first rendered to the DOM, the <code>button</code>&apos;s inner text should be Submit.'
-    testString: 'assert(Enzyme.mount(React.createElement(CheckUserAge)).find("button").text() === "Submit", "When the <code>CheckUserAge</code> component is first rendered to the DOM, the <code>button</code>&apos;s inner text should be Submit.");'
-  - text: 'When a number of less than 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You Shall Not Pass</code>.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(CheckUserAge)); const initialButton = mockedComponent.find("button").text(); const enter3AndClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "3" }}); mockedComponent.find("button").simulate("click"); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const enter17AndClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "17" }}); mockedComponent.find("button").simulate("click"); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const userAge3 = await enter3AndClickButton(); const userAge17 = await enter17AndClickButton(); assert(initialButton === "Submit" && userAge3 === "You Shall Not Pass" && userAge17 === "You Shall Not Pass", "When a number of less than 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You Shall Not Pass</code>."); }; '
-  - text: 'When a number greater than or equal to 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You May Enter</code>.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(CheckUserAge)); const initialButton = mockedComponent.find("button").text(); const enter18AndClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "18" }}); mockedComponent.find("button").simulate("click"); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const enter35AndClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "35" }}); mockedComponent.find("button").simulate("click"); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const userAge18 = await enter18AndClickButton(); const userAge35 = await enter35AndClickButton(); assert(initialButton === "Submit" && userAge18 === "You May Enter" && userAge35 === "You May Enter", "When a number greater than or equal to 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You May Enter</code>."); }; '
-  - text: 'Once a number has been submitted, and the value of the <code>input</code> is once again changed, the <code>button</code> should return to reading <code>Submit</code>.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(CheckUserAge)); const enter18AndClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "18" }}); mockedComponent.find("button").simulate("click"); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const changeInputDontClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "5" }}); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const enter10AndClickButton = () => { mockedComponent.find("input").simulate("change", {target: { value: "10" }}); mockedComponent.find("button").simulate("click"); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find("button").text(); }); }; const userAge18 = await enter18AndClickButton(); const changeInput1 = await changeInputDontClickButton(); const userAge10 = await enter10AndClickButton(); const changeInput2 = await changeInputDontClickButton(); assert(userAge18 === "You May Enter" && changeInput1 === "Submit" && userAge10 === "You Shall Not Pass" && changeInput2 === "Submit", "Once a number has been submitted, and the value of the <code>input</code> is once again changed, the <code>button</code> should return to reading <code>Submit</code>."); }; '
+    testString: assert(Enzyme.mount(React.createElement(CheckUserAge)).find('div').find('input').length === 1 && Enzyme.mount(React.createElement(CheckUserAge)).find('div').find('button').length === 1, 'The <code>CheckUserAge</code> component should render with a single <code>input</code> element and a single <code>button</code> element.');
+  - text: The <code>CheckUserAge</code> component&apos;s state should be initialized with a property of <code>userAge</code> and a property of <code>input</code>, both set to a value of an empty string.
+    testString: assert(Enzyme.mount(React.createElement(CheckUserAge)).state().input === '' && Enzyme.mount(React.createElement(CheckUserAge)).state().userAge === '', 'The <code>CheckUserAge</code> component&apos;s state should be initialized with a property of <code>userAge</code> and a property of <code>input</code>, both set to a value of an empty string.');
+  - text: When the <code>CheckUserAge</code> component is first rendered to the DOM, the <code>button</code>&apos;s inner text should be Submit.
+    testString: assert(Enzyme.mount(React.createElement(CheckUserAge)).find('button').text() === 'Submit', 'When the <code>CheckUserAge</code> component is first rendered to the DOM, the <code>button</code>&apos;s inner text should be Submit.');
+  - text: When a number of less than 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You Shall Not Pass</code>.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(CheckUserAge)); const initialButton = mockedComponent.find(''button'').text(); const enter3AndClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''3'' }}); mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const enter17AndClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''17'' }}); mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const userAge3 = await enter3AndClickButton(); const userAge17 = await enter17AndClickButton(); assert(initialButton === ''Submit'' && userAge3 === ''You Shall Not Pass'' && userAge17 === ''You Shall Not Pass'', ''When a number of less than 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You Shall Not Pass</code>.''); }; '
+  - text: When a number greater than or equal to 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You May Enter</code>.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(CheckUserAge)); const initialButton = mockedComponent.find(''button'').text(); const enter18AndClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''18'' }}); mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const enter35AndClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''35'' }}); mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const userAge18 = await enter18AndClickButton(); const userAge35 = await enter35AndClickButton(); assert(initialButton === ''Submit'' && userAge18 === ''You May Enter'' && userAge35 === ''You May Enter'', ''When a number greater than or equal to 18 is entered into the <code>input</code> element and the <code>button</code> is clicked, the <code>button</code>&apos;s inner text should read <code>You May Enter</code>.''); }; '
+  - text: Once a number has been submitted, and the value of the <code>input</code> is once again changed, the <code>button</code> should return to reading <code>Submit</code>.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(CheckUserAge)); const enter18AndClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''18'' }}); mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const changeInputDontClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''5'' }}); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const enter10AndClickButton = () => { mockedComponent.find(''input'').simulate(''change'', {target: { value: ''10'' }}); mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => { mockedComponent.update(); return mockedComponent.find(''button'').text(); }); }; const userAge18 = await enter18AndClickButton(); const changeInput1 = await changeInputDontClickButton(); const userAge10 = await enter10AndClickButton(); const changeInput2 = await changeInputDontClickButton(); assert(userAge18 === ''You May Enter'' && changeInput1 === ''Submit'' && userAge10 === ''You Shall Not Pass'' && changeInput2 === ''Submit'', ''Once a number has been submitted, and the value of the <code>input</code> is once again changed, the <code>button</code> should return to reading <code>Submit</code>.''); }; '
   - text: Your code should not contain any <code>if/else</code> statements.
-    testString: 'assert(new RegExp(/(\s|;)if(\s|\()/).test(Enzyme.mount(React.createElement(CheckUserAge)).instance().render.toString()) === false, "Your code should not contain any <code>if/else</code> statements.");'
+    testString: assert(new RegExp(/(\s|;)if(\s|\()/).test(Enzyme.mount(React.createElement(CheckUserAge)).instance().render.toString()) === false, 'Your code should not contain any <code>if/else</code> statements.');
 
 ```
 
@@ -65,7 +65,7 @@ class CheckUserAge extends React.Component {
   handleChange(e) {
     this.setState({
       input: e.target.value,
-      userAge: "
+      userAge: ''
     });
   }
   submit() {
@@ -101,7 +101,7 @@ class CheckUserAge extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<CheckUserAge />, document.getElementById('root'))
 ```
 
 </div>
@@ -122,8 +122,8 @@ class CheckUserAge extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      userAge: ",
-      input: "
+      userAge: '',
+      input: ''
     }
     this.submit = this.submit.bind(this);
     this.handleChange = this.handleChange.bind(this);
@@ -131,7 +131,7 @@ class CheckUserAge extends React.Component {
   handleChange(e) {
     this.setState({
       input: e.target.value,
-      userAge: "
+      userAge: ''
     });
   }
   submit() {
@@ -152,7 +152,7 @@ class CheckUserAge extends React.Component {
           value={this.state.input}
           onChange={this.handleChange} /><br />
           {
-            this.state.userAge === " ?
+            this.state.userAge === '' ?
             buttonOne :
             this.state.userAge >= 18 ?
             buttonTwo :
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.english.md
index d3ac0057d6..548cb370a2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.english.md
@@ -22,17 +22,17 @@ In the code provided, the <code>render</code> method has an array that contains
 ```yml
 tests:
   - text: The <code>MagicEightBall</code> component should exist and should render to the page.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(MagicEightBall)).find("MagicEightBall").length, 1, "The <code>MagicEightBall</code> component should exist and should render to the page.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(MagicEightBall)).find('MagicEightBall').length, 1, 'The <code>MagicEightBall</code> component should exist and should render to the page.');
   - text: <code>MagicEightBall</code>&apos;s first child should be an <code>input</code> element.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(MagicEightBall)).children().childAt(0).name(), "input", "<code>MagicEightBall</code>&apos;s first child should be an <code>input</code> element.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(MagicEightBall)).children().childAt(0).name(), 'input', '<code>MagicEightBall</code>&apos;s first child should be an <code>input</code> element.');
   - text: <code>MagicEightBall</code>&apos;s third child should be a <code>button</code> element.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(MagicEightBall)).children().childAt(2).name(), "button", "<code>MagicEightBall</code>&apos;s third child should be a <code>button</code> element.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(MagicEightBall)).children().childAt(2).name(), 'button', '<code>MagicEightBall</code>&apos;s third child should be a <code>button</code> element.');
   - text: <code>MagicEightBall</code>&apos;s state should be initialized with a property of <code>userInput</code> and a property of <code>randomIndex</code> both set to a value of an empty string.
-    testString: 'assert(Enzyme.mount(React.createElement(MagicEightBall)).state("randomIndex") === "" && Enzyme.mount(React.createElement(MagicEightBall)).state("userInput") === "", "<code>MagicEightBall</code>&apos;s state should be initialized with a property of <code>userInput</code> and a property of <code>randomIndex</code> both set to a value of an empty string.");'
-  - text: 'When <code>MagicEightBall</code> is first mounted to the DOM, it should return an empty <code>p</code> element.'
-    testString: 'assert(Enzyme.mount(React.createElement(MagicEightBall)).find("p").length === 1 && Enzyme.mount(React.createElement(MagicEightBall)).find("p").text() === "", "When <code>MagicEightBall</code> is first mounted to the DOM, it should return an empty <code>p</code> element.");'
-  - text: 'When text is entered into the <code>input</code> element and the button is clicked, the <code>MagicEightBall</code> component should return a <code>p</code> element that contains a random element from the <code>possibleAnswers</code> array.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(MagicEightBall)); const simulate = () => { comp.find("input").simulate("change", { target: { value: "test?" }}); comp.find("button").simulate("click"); }; const result = () => comp.find("p").text(); const _1 = () => { simulate(); return waitForIt(() => result()) }; const _2 = () => { simulate(); return waitForIt(() => result()) }; const _3 = () => { simulate(); return waitForIt(() => result()) }; const _4 = () => { simulate(); return waitForIt(() => result()) }; const _5 = () => { simulate(); return waitForIt(() => result()) }; const _6 = () => { simulate(); return waitForIt(() => result()) }; const _7 = () => { simulate(); return waitForIt(() => result()) }; const _8 = () => { simulate(); return waitForIt(() => result()) }; const _9 = () => { simulate(); return waitForIt(() => result()) }; const _10 = () => { simulate(); return waitForIt(() => result()) }; const _1_val = await _1(); const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); const _5_val = await _5(); const _6_val = await _6(); const _7_val = await _7(); const _8_val = await _8(); const _9_val = await _9(); const _10_val = await _10(); const actualAnswers = [_1_val, _2_val, _3_val, _4_val, _5_val, _6_val, _7_val, _8_val, _9_val, _10_val]; const hasIndex = actualAnswers.filter((answer, i) => possibleAnswers.indexOf(answer) !== -1); const notAllEqual = new Set(actualAnswers); assert(notAllEqual.size > 1 && hasIndex.length === 10, "When text is entered into the <code>input</code> element and the button is clicked, the <code>MagicEightBall</code> component should return a <code>p</code> element that contains a random element from the <code>possibleAnswers</code> array.");}'
+    testString: assert(Enzyme.mount(React.createElement(MagicEightBall)).state('randomIndex') === '' && Enzyme.mount(React.createElement(MagicEightBall)).state('userInput') === '', '<code>MagicEightBall</code>&apos;s state should be initialized with a property of <code>userInput</code> and a property of <code>randomIndex</code> both set to a value of an empty string.');
+  - text: When <code>MagicEightBall</code> is first mounted to the DOM, it should return an empty <code>p</code> element.
+    testString: assert(Enzyme.mount(React.createElement(MagicEightBall)).find('p').length === 1 && Enzyme.mount(React.createElement(MagicEightBall)).find('p').text() === '', 'When <code>MagicEightBall</code> is first mounted to the DOM, it should return an empty <code>p</code> element.');
+  - text: When text is entered into the <code>input</code> element and the button is clicked, the <code>MagicEightBall</code> component should return a <code>p</code> element that contains a random element from the <code>possibleAnswers</code> array.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(MagicEightBall)); const simulate = () => { comp.find(''input'').simulate(''change'', { target: { value: ''test?'' }}); comp.find(''button'').simulate(''click''); }; const result = () => comp.find(''p'').text(); const _1 = () => { simulate(); return waitForIt(() => result()) }; const _2 = () => { simulate(); return waitForIt(() => result()) }; const _3 = () => { simulate(); return waitForIt(() => result()) }; const _4 = () => { simulate(); return waitForIt(() => result()) }; const _5 = () => { simulate(); return waitForIt(() => result()) }; const _6 = () => { simulate(); return waitForIt(() => result()) }; const _7 = () => { simulate(); return waitForIt(() => result()) }; const _8 = () => { simulate(); return waitForIt(() => result()) }; const _9 = () => { simulate(); return waitForIt(() => result()) }; const _10 = () => { simulate(); return waitForIt(() => result()) }; const _1_val = await _1(); const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); const _5_val = await _5(); const _6_val = await _6(); const _7_val = await _7(); const _8_val = await _8(); const _9_val = await _9(); const _10_val = await _10(); const actualAnswers = [_1_val, _2_val, _3_val, _4_val, _5_val, _6_val, _7_val, _8_val, _9_val, _10_val]; const hasIndex = actualAnswers.filter((answer, i) => possibleAnswers.indexOf(answer) !== -1); const notAllEqual = new Set(actualAnswers); assert(notAllEqual.size > 1 && hasIndex.length === 10, ''When text is entered into the <code>input</code> element and the button is clicked, the <code>MagicEightBall</code> component should return a <code>p</code> element that contains a random element from the <code>possibleAnswers</code> array.'');}'
 
 ```
 
@@ -53,8 +53,8 @@ class MagicEightBall extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      userInput: ",
-      randomIndex: "
+      userInput: '',
+      randomIndex: ''
     }
     this.ask = this.ask.bind(this);
     this.handleChange = this.handleChange.bind(this);
@@ -63,7 +63,7 @@ class MagicEightBall extends React.Component {
     if (this.state.userInput) {
       this.setState({
         randomIndex: Math.floor(Math.random() * 20),
-        userInput: "
+        userInput: ''
       });
     }
   }
@@ -125,7 +125,8 @@ class MagicEightBall extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+var possibleAnswers = [ 'It is certain', 'It is decidedly so', 'Without a doubt', 'Yes, definitely', 'You may rely on it', 'As I see it, yes', 'Outlook good', 'Yes', 'Signs point to yes', 'Reply hazy try again', 'Ask again later', 'Better not tell you now', 'Cannot predict now', 'Concentrate and ask again', 'Don\'t count on it', 'My reply is no', 'My sources say no', 'Outlook not so good','Very doubtful', 'Most likely' ];
+ReactDOM.render(<MagicEightBall />, document.getElementById('root'))
 ```
 
 </div>
@@ -146,8 +147,8 @@ class MagicEightBall extends React.Component {
   constructor(props) {
     super(props);
     this.state = {
-      userInput: ",
-      randomIndex: "
+      userInput: '',
+      randomIndex: ''
     }
     this.ask = this.ask.bind(this);
     this.handleChange = this.handleChange.bind(this);
@@ -156,7 +157,7 @@ class MagicEightBall extends React.Component {
     if (this.state.userInput) {
       this.setState({
         randomIndex: Math.floor(Math.random() * 20),
-        userInput: "
+        userInput: ''
       });
     }
   }
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.english.md
index 66f0d99f9d..236748b989 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.english.md
@@ -22,15 +22,15 @@ In the code editor, <code>MyComponent</code>&apos;s <code>state</code> is initia
 ```yml
 tests:
   - text: <code>MyComponent</code> should exist and render to the page.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(MyComponent)).find("MyComponent").length, 1, "<code>MyComponent</code> should exist and render to the page.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(MyComponent)).find('MyComponent').length, 1, '<code>MyComponent</code> should exist and render to the page.');
   - text: <code>MyComponent</code>&apos;s state should be initialized to an array of six users.")
-    testString: 'assert(Array.isArray(Enzyme.mount(React.createElement(MyComponent)).state("users")) === true && Enzyme.mount(React.createElement(MyComponent)).state("users").length === 6, "<code>MyComponent</code>&apos;s state should be initialized to an array of six users.");'
-  - text: '<code>MyComponent</code> should return a <code>div</code>, an <code>h1</code>, and then an unordered list containing <code>li</code> elements for every user whose online status is set to <code>true</code>.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(MyComponent)); const users = (bool) => ({users:[ { username: "Jeff", online: bool }, { username: "Alan", online: bool }, { username: "Mary", online: bool }, { username: "Jim", online: bool   }, { username: "Laura", online: bool } ]}); const result = () => comp.find("li").length; const _1 = result(); const _2 = () => { comp.setState(users(true)); return waitForIt(() => result()) }; const _3 = () => { comp.setState(users(false)); return waitForIt(() => result()) }; const _4 = () => { comp.setState({ users: [] }); return waitForIt(() => result()) }; const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); assert(comp.find("div").length === 1 && comp.find("h1").length === 1 && comp.find("ul").length === 1 && _1 === 4 && _2_val === 5 && _3_val === 0 && _4_val === 0, "<code>MyComponent</code> should return a <code>div</code>, an <code>h1</code>, and then an unordered list containing <code>li</code> elements for every user whose online status is set to <code>true</code>."); }; '
+    testString: assert(Array.isArray(Enzyme.mount(React.createElement(MyComponent)).state('users')) === true && Enzyme.mount(React.createElement(MyComponent)).state('users').length === 6, "<code>MyComponent</code>&apos;s state should be initialized to an array of six users.");
+  - text: <code>MyComponent</code> should return a <code>div</code>, an <code>h1</code>, and then an unordered list containing <code>li</code> elements for every user whose online status is set to <code>true</code>.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(MyComponent)); const users = (bool) => ({users:[ { username: ''Jeff'', online: bool }, { username: ''Alan'', online: bool }, { username: ''Mary'', online: bool }, { username: ''Jim'', online: bool   }, { username: ''Laura'', online: bool } ]}); const result = () => comp.find(''li'').length; const _1 = result(); const _2 = () => { comp.setState(users(true)); return waitForIt(() => result()) }; const _3 = () => { comp.setState(users(false)); return waitForIt(() => result()) }; const _4 = () => { comp.setState({ users: [] }); return waitForIt(() => result()) }; const _2_val = await _2(); const _3_val = await _3(); const _4_val = await _4(); assert(comp.find(''div'').length === 1 && comp.find(''h1'').length === 1 && comp.find(''ul'').length === 1 && _1 === 4 && _2_val === 5 && _3_val === 0 && _4_val === 0, ''<code>MyComponent</code> should return a <code>div</code>, an <code>h1</code>, and then an unordered list containing <code>li</code> elements for every user whose online status is set to <code>true</code>.''); }; '
   - text: <code>MyComponent</code> should render <code>li</code> elements that contain the username of each online user.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(MyComponent)); const users = (bool) => ({users:[ { username: "Jeff", online: bool }, { username: "Alan", online: bool }, { username: "Mary", online: bool }, { username: "Jim", online: bool   }, { username: "Laura", online: bool } ]}); const ul = () => { comp.setState(users(true)); return waitForIt(() => comp.find("ul").html()) }; const html = await ul(); assert(html === "<ul><li>Jeff</li><li>Alan</li><li>Mary</li><li>Jim</li><li>Laura</li></ul>", "<code>MyComponent</code> should render <code>li</code> elements that contain the username of each online user."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const comp = Enzyme.mount(React.createElement(MyComponent)); const users = (bool) => ({users:[ { username: ''Jeff'', online: bool }, { username: ''Alan'', online: bool }, { username: ''Mary'', online: bool }, { username: ''Jim'', online: bool   }, { username: ''Laura'', online: bool } ]}); const ul = () => { comp.setState(users(true)); return waitForIt(() => comp.find(''ul'').html()) }; const html = await ul(); assert(html === ''<ul><li>Jeff</li><li>Alan</li><li>Mary</li><li>Jim</li><li>Laura</li></ul>'', ''<code>MyComponent</code> should render <code>li</code> elements that contain the username of each online user.''); }; '
   - text: Each list item element should have a unique <code>key</code> attribute.
-    testString: 'assert((() => { const ul = Enzyme.mount(React.createElement(MyComponent)).find("ul"); console.log(ul.debug()); const keys = new Set([ ul.childAt(0).key(), ul.childAt(1).key(), ul.childAt(2).key(), ul.childAt(3).key() ]); return keys.size === 4; })(), "Each list item element should have a unique <code>key</code> attribute.");'
+    testString: assert((() => { const ul = Enzyme.mount(React.createElement(MyComponent)).find('ul'); console.log(ul.debug()); const keys = new Set([ ul.childAt(0).key(), ul.childAt(1).key(), ul.childAt(2).key(), ul.childAt(3).key() ]); return keys.size === 4; })(), 'Each list item element should have a unique <code>key</code> attribute.');
 
 ```
 
@@ -96,7 +96,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.english.md
index b496eb5d91..7748d9f7f4 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.english.md
@@ -24,17 +24,17 @@ Inside the <code>constructor</code>, create a <code>this.state</code> object and
 ```yml
 tests:
   - text: The MyToDoList component should exist and render to the page.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); return mockedComponent.find("MyToDoList").length === 1; })(), "The MyToDoList component should exist and render to the page.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); return mockedComponent.find('MyToDoList').length === 1; })(), 'The MyToDoList component should exist and render to the page.');
   - text: The first child of <code>MyToDoList</code> should be a <code>textarea</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); return mockedComponent.find("MyToDoList").children().childAt(0).type() === "textarea"; })(), "The first child of <code>MyToDoList</code> should be a <code>textarea</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); return mockedComponent.find('MyToDoList').children().childAt(0).type() === 'textarea'; })(), 'The first child of <code>MyToDoList</code> should be a <code>textarea</code> element.');
   - text: The third child of <code>MyToDoList</code> should be a <code>button</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); return mockedComponent.find("MyToDoList").children().childAt(2).type() === "button"; })(), "The third child of <code>MyToDoList</code> should be a <code>button</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); return mockedComponent.find('MyToDoList').children().childAt(2).type() === 'button'; })(), 'The third child of <code>MyToDoList</code> should be a <code>button</code> element.');
   - text: The state of <code>MyToDoList</code> should be initialized with <code>toDoList</code> as an empty array.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); const initialState = mockedComponent.state(); return Array.isArray(initialState.toDoList) === true && initialState.toDoList.length === 0; })(), "The state of <code>MyToDoList</code> should be initialized with <code>toDoList</code> as an empty array.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); const initialState = mockedComponent.state(); return Array.isArray(initialState.toDoList) === true && initialState.toDoList.length === 0; })(), 'The state of <code>MyToDoList</code> should be initialized with <code>toDoList</code> as an empty array.');
   - text: The state of <code>MyToDoList</code> should be initialized with <code>userInput</code> as an empty string.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); const initialState = mockedComponent.state(); return typeof initialState.userInput === "string" && initialState.userInput.length === 0; })(), "The state of <code>MyToDoList</code> should be initialized with <code>userInput</code> as an empty string.");'
-  - text: 'When the <code>Create List</code> button is clicked, the <code>MyToDoList</code> component should dynamically return an unordered list that contains a list item element for every item of a comma-separated list entered into the <code>textarea</code> element.'
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); const simulateChange = (el, value) => el.simulate("change", {target: {value}}); const state_1 = () => { return waitForIt(() => mockedComponent.find("ul").find("li"))}; const setInput = () => { return waitForIt(() => simulateChange(mockedComponent.find("textarea"), "testA, testB, testC"))}; const click = () => { return waitForIt(() => mockedComponent.find("button").simulate("click"))}; const state_2 = () => { return waitForIt(() => { const nodes = mockedComponent.find("ul").find("li"); return { nodes, text: nodes.reduce((t, n) => t + n.text(), "") }; })}; const setInput_2 = () => { return waitForIt(() => simulateChange(mockedComponent.find("textarea"), "t1, t2, t3, t4, t5, t6"))}; const click_1 = () => { return waitForIt(() => mockedComponent.find("button").simulate("click"))}; const state_3 = () => { return waitForIt(() => { const nodes = mockedComponent.find("ul").find("li"); return { nodes, text: nodes.reduce((t, n) => t + n.text(), "") }; })}; const awaited_state_1 = await state_1(); const awaited_setInput = await setInput(); const awaited_click = await click(); const awaited_state_2 = await state_2(); const awaited_setInput_2 = await setInput_2(); const awaited_click_1 = await click_1(); const awaited_state_3 = await state_3(); assert(awaited_state_1.length === 0 && awaited_state_2.nodes.length === 3 && awaited_state_3.nodes.length === 6 && awaited_state_2.text === "testA testB testC" && awaited_state_3.text === "t1 t2 t3 t4 t5 t6", "When the <code>Create List</code> button is clicked, the <code>MyToDoList</code> component should dynamically return an unordered list that contains a list item element for every item of a comma-separated list entered into the <code>textarea</code> element."); }; '
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); const initialState = mockedComponent.state(); return typeof initialState.userInput === 'string' && initialState.userInput.length === 0; })(), 'The state of <code>MyToDoList</code> should be initialized with <code>userInput</code> as an empty string.');
+  - text: When the <code>Create List</code> button is clicked, the <code>MyToDoList</code> component should dynamically return an unordered list that contains a list item element for every item of a comma-separated list entered into the <code>textarea</code> element.
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const mockedComponent = Enzyme.mount(React.createElement(MyToDoList)); const simulateChange = (el, value) => el.simulate(''change'', {target: {value}}); const state_1 = () => { return waitForIt(() => mockedComponent.find(''ul'').find(''li''))}; const setInput = () => { return waitForIt(() => simulateChange(mockedComponent.find(''textarea''), "testA, testB, testC"))}; const click = () => { return waitForIt(() => mockedComponent.find(''button'').simulate(''click''))}; const state_2 = () => { return waitForIt(() => { const nodes = mockedComponent.find(''ul'').find(''li''); return { nodes, text: nodes.reduce((t, n) => t + n.text(), '''') }; })}; const setInput_2 = () => { return waitForIt(() => simulateChange(mockedComponent.find(''textarea''), "t1, t2, t3, t4, t5, t6"))}; const click_1 = () => { return waitForIt(() => mockedComponent.find(''button'').simulate(''click''))}; const state_3 = () => { return waitForIt(() => { const nodes = mockedComponent.find(''ul'').find(''li''); return { nodes, text: nodes.reduce((t, n) => t + n.text(), '''') }; })}; const awaited_state_1 = await state_1(); const awaited_setInput = await setInput(); const awaited_click = await click(); const awaited_state_2 = await state_2(); const awaited_setInput_2 = await setInput_2(); const awaited_click_1 = await click_1(); const awaited_state_3 = await state_3(); assert(awaited_state_1.length === 0 && awaited_state_2.nodes.length === 3 && awaited_state_3.nodes.length === 6 && awaited_state_2.text === ''testA testB testC'' && awaited_state_3.text === ''t1 t2 t3 t4 t5 t6'', ''When the <code>Create List</code> button is clicked, the <code>MyToDoList</code> component should dynamically return an unordered list that contains a list item element for every item of a comma-separated list entered into the <code>textarea</code> element.''); }; '
 
 ```
 
@@ -98,7 +98,7 @@ class MyToDoList extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyToDoList />, document.getElementById('root'))
 ```
 
 </div>
@@ -120,7 +120,7 @@ class MyToDoList extends React.Component {
     super(props);
     this.state = {
       toDoList: [],
-      userInput: "
+      userInput: ''
     }
     this.handleSubmit = this.handleSubmit.bind(this);
     this.handleChange = this.handleChange.bind(this);
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-default-props.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-default-props.english.md
index 9b325252c4..fab9da4f48 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-default-props.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-default-props.english.md
@@ -21,9 +21,9 @@ The code editor shows a <code>ShoppingCart</code> component. Define default prop
 ```yml
 tests:
   - text: The <code>ShoppingCart</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find("ShoppingCart").length === 1; })(), "The <code>ShoppingCart</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find('ShoppingCart').length === 1; })(), 'The <code>ShoppingCart</code> component should render.');
   - text: 'The <code>ShoppingCart</code> component should have a default prop of <code>{ items: 0 }</code>.'
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); mockedComponent.setProps({items: undefined}); return mockedComponent.find("ShoppingCart").props().items === 0; })(), "The <code>ShoppingCart</code> component should have a default prop of <code>{ items: 0 }</code>.");'
+    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); mockedComponent.setProps({items: undefined}); return mockedComponent.find(''ShoppingCart'').props().items === 0; })(), ''The <code>ShoppingCart</code> component should have a default prop of <code>{ items: 0 }</code>.'');'
 
 ```
 
@@ -53,7 +53,7 @@ const ShoppingCart = (props) => {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ShoppingCart />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.english.md
index 9973924f11..5593f53ef6 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.english.md
@@ -26,11 +26,11 @@ Define <code>propTypes</code> for the <code>Items</code> component to require <c
 ```yml
 tests:
   - text: The <code>ShoppingCart</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find("ShoppingCart").length === 1; })(), "The <code>ShoppingCart</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find('ShoppingCart').length === 1; })(), 'The <code>ShoppingCart</code> component should render.');
   - text: The <code>Items</code> component should render.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find("Items").length === 1; })(), "The <code>Items</code> component should render.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(ShoppingCart)); return mockedComponent.find('Items').length === 1; })(), 'The <code>Items</code> component should render.');
   - text: The <code>Items</code> component should include a <code>propTypes</code> check that requires <code>quantity</code> to be a <code>number</code>.
-    testString: 'getUserInput => assert((function() { const noWhiteSpace = getUserInput("index").replace(/ /g, ""); return noWhiteSpace.includes("quantity:PropTypes.number.isRequired") && noWhiteSpace.includes("Items.propTypes="); })(), "The <code>Items</code> component should include a <code>propTypes</code> check that requires <code>quantity</code> to be a <code>number</code>.");'
+    testString: getUserInput => assert((function() { const noWhiteSpace = getUserInput('index').replace(/ /g, '); return noWhiteSpace.includes('quantity:PropTypes.number.isRequired') && noWhiteSpace.includes('Items.propTypes='); })(), 'The <code>Items</code> component should include a <code>propTypes</code> check that requires <code>quantity</code> to be a <code>number</code>.');
 
 ```
 
@@ -82,7 +82,7 @@ var PropTypes = {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<ShoppingCart />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-react-to-render-nested-components.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-react-to-render-nested-components.english.md
index 5e29159d7c..78a75b8270 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-react-to-render-nested-components.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-react-to-render-nested-components.english.md
@@ -22,13 +22,13 @@ There are two functional components defined in the code editor, called <code>Typ
 ```yml
 tests:
   - text: The <code>TypesOfFood</code> component should return a single <code>div</code> element.
-    testString: 'assert(Enzyme.shallow(React.createElement(TypesOfFood)).type() === "div", "The <code>TypesOfFood</code> component should return a single <code>div</code> element.");'
+    testString: assert(Enzyme.shallow(React.createElement(TypesOfFood)).type() === 'div', 'The <code>TypesOfFood</code> component should return a single <code>div</code> element.');
   - text: The <code>TypesOfFood</code> component should return the <code>Fruits</code> component.
-    testString: 'assert(Enzyme.shallow(React.createElement(TypesOfFood)).props().children[1].type.name === "Fruits", "The <code>TypesOfFood</code> component should return the <code>Fruits</code> component.");'
+    testString: assert(Enzyme.shallow(React.createElement(TypesOfFood)).props().children[1].type.name === 'Fruits', 'The <code>TypesOfFood</code> component should return the <code>Fruits</code> component.');
   - text: The <code>Fruits</code> component should return the <code>TypesOfFruit</code> component.
-    testString: 'assert(Enzyme.mount(React.createElement(TypesOfFood)).find("h2").html() === "<h2>Fruits:</h2>", "The <code>Fruits</code> component should return the <code>TypesOfFruit</code> component.");'
+    testString: assert(Enzyme.mount(React.createElement(TypesOfFood)).find('h2').html() === '<h2>Fruits:</h2>', 'The <code>Fruits</code> component should return the <code>TypesOfFruit</code> component.');
   - text: The <code>TypesOfFruit</code> component should return the <code>h2</code> and <code>ul</code> elements.
-    testString: 'assert(Enzyme.mount(React.createElement(TypesOfFood)).find("ul").text() === "ApplesBlueberriesStrawberriesBananas", "The <code>TypesOfFruit</code> component should return the <code>h2</code> and <code>ul</code> elements.");'
+    testString: assert(Enzyme.mount(React.createElement(TypesOfFood)).find('ul').text() === 'ApplesBlueberriesStrawberriesBananas', 'The <code>TypesOfFruit</code> component should return the <code>h2</code> and <code>ul</code> elements.');
 
 ```
 
@@ -89,7 +89,7 @@ class TypesOfFood extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<TypesOfFood />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-state-to-toggle-an-element.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-state-to-toggle-an-element.english.md
index 8efe77d812..af17948e6c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-state-to-toggle-an-element.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-state-to-toggle-an-element.english.md
@@ -24,11 +24,11 @@ Finally, click the button to see the conditional rendering of the component base
 ```yml
 tests:
   - text: <code>MyComponent</code> should return a <code>div</code> element which contains a <code>button</code>.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(MyComponent)).find("div").find("button").length, 1, "<code>MyComponent</code> should return a <code>div</code> element which contains a <code>button</code>.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(MyComponent)).find('div').find('button').length, 1, '<code>MyComponent</code> should return a <code>div</code> element which contains a <code>button</code>.');
   - text: The state of <code>MyComponent</code> should initialize with a <code>visibility</code> property set to <code>false</code>.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(MyComponent)).state("visibility"), false, "The state of <code>MyComponent</code> should initialize with a <code>visibility</code> property set to <code>false</code>.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(MyComponent)).state('visibility'), false, 'The state of <code>MyComponent</code> should initialize with a <code>visibility</code> property set to <code>false</code>.');
   - text: Clicking the button element should toggle the <code>visibility</code> property in state between <code>true</code> and <code>false</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ visibility: false }); return waitForIt(() => mockedComponent.state("visibility")); }; const second = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent.state("visibility")); }; const third = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent.state("visibility")); }; const firstValue = await first(); const secondValue = await second(); const thirdValue = await third(); assert(!firstValue && secondValue && !thirdValue, "Clicking the button element should toggle the <code>visibility</code> property in state between <code>true</code> and <code>false</code>."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ visibility: false }); return waitForIt(() => mockedComponent.state(''visibility'')); }; const second = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent.state(''visibility'')); }; const third = () => { mockedComponent.find(''button'').simulate(''click''); return waitForIt(() => mockedComponent.state(''visibility'')); }; const firstValue = await first(); const secondValue = await second(); const thirdValue = await third(); assert(!firstValue && secondValue && !thirdValue, ''Clicking the button element should toggle the <code>visibility</code> property in state between <code>true</code> and <code>false</code>.''); }; '
 
 ```
 
@@ -79,7 +79,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.english.md
index 9c993add5e..dbda59470b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.english.md
@@ -22,11 +22,11 @@ There is a mock API call in <code>componentDidMount()</code>. It sets state afte
 ```yml
 tests:
   - text: <code>MyComponent</code> should render a <code>div</code> element which wraps an <code>h1</code> tag.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return (mockedComponent.find("div").length === 1 && mockedComponent.find("h1").length === 1); })(), "<code>MyComponent</code> should render a <code>div</code> element which wraps an <code>h1</code> tag.");'
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return (mockedComponent.find('div').length === 1 && mockedComponent.find('h1').length === 1); })(), '<code>MyComponent</code> should render a <code>div</code> element which wraps an <code>h1</code> tag.');
   - text: Component state should be updated with a timeout function in <code>componentDidMount</code>.
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return new RegExp("setTimeout(.|\n)+setState(.|\n)+activeUsers").test(String(mockedComponent.instance().componentDidMount)); })(), "Component state should be updated with a timeout function in <code>componentDidMount</code>.");'
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return new RegExp('setTimeout(.|\n)+setState(.|\n)+activeUsers').test(String(mockedComponent.instance().componentDidMount)); })(), 'Component state should be updated with a timeout function in <code>componentDidMount</code>.');
   - text: The <code>h1</code> tag should render the <code>activeUsers</code> value from <code>MyComponent</code>&apos;s state.
-    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ activeUsers: 1237 }); return mockedComponent.find("h1").text(); }; const second = () => { mockedComponent.setState({ activeUsers: 1000 }); return mockedComponent.find("h1").text(); }; assert(new RegExp("1237").test(first()) && new RegExp("1000").test(second()), "The <code>h1</code> tag should render the <code>activeUsers</code> value from <code>MyComponent</code>&apos;s state."); }; '
+    testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const first = () => { mockedComponent.setState({ activeUsers: 1237 }); return mockedComponent.find(''h1'').text(); }; const second = () => { mockedComponent.setState({ activeUsers: 1000 }); return mockedComponent.find(''h1'').text(); }; assert(new RegExp(''1237'').test(first()) && new RegExp(''1000'').test(second()), ''The <code>h1</code> tag should render the <code>activeUsers</code> value from <code>MyComponent</code>&apos;s state.''); }; '
 
 ```
 
@@ -69,7 +69,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.english.md b/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.english.md
index 250383e4c3..27860869cb 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.english.md
@@ -29,9 +29,9 @@ The <code>componentWillMount()</code> method is called before the <code>render()
 ```yml
 tests:
   - text: <code>MyComponent</code> should render a <code>div</code> element.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("div").length === 1; })(), "<code>MyComponent</code> should render a <code>div</code> element.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find('div').length === 1; })(), '<code>MyComponent</code> should render a <code>div</code> element.');
   - text: <code>console.log</code> should be called in <code>componentWillMount</code>.
-    testString: 'assert((function() { const lifecycle = React.createElement(MyComponent).type.prototype.componentWillMount.toString().replace(/ /g,""); return lifecycle.includes("console.log("); })(), "<code>console.log</code> should be called in <code>componentWillMount</code>.");'
+    testString: assert((function() { const lifecycle = React.createElement(MyComponent).type.prototype.componentWillMount.toString().replace(/ /g,''); return lifecycle.includes('console.log('); })(), '<code>console.log</code> should be called in <code>componentWillMount</code>.');
 
 ```
 
@@ -65,7 +65,7 @@ class MyComponent extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<MyComponent />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/write-a-react-component-from-scratch.english.md b/curriculum/challenges/english/03-front-end-libraries/react/write-a-react-component-from-scratch.english.md
index 487fe12065..a61c0f46be 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/write-a-react-component-from-scratch.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/write-a-react-component-from-scratch.english.md
@@ -22,11 +22,11 @@ Render this component to the DOM using <code>ReactDOM.render()</code>. There is
 ```yml
 tests:
   - text: There should be a React component called <code>MyComponent</code>.
-    testString: 'getUserInput => assert(getUserInput("index").replace(/\s/g, "").includes("classMyComponentextendsReact.Component{"), "There should be a React component called <code>MyComponent</code>.");'
+    testString: getUserInput => assert(getUserInput('index').replace(/\s/g, ').includes('classMyComponentextendsReact.Component{'), 'There should be a React component called <code>MyComponent</code>.');
   - text: <code>MyComponent</code> should contain an <code>h1</code> tag with text <code>My First React Component!</code> Case and punctuation matter.
-    testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("h1").text() === "My First React Component!"; })(), "<code>MyComponent</code> should contain an <code>h1</code> tag with text <code>My First React Component!</code> Case and punctuation matter.");'
+    testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find('h1').text() === 'My First React Component!'; })(), '<code>MyComponent</code> should contain an <code>h1</code> tag with text <code>My First React Component!</code> Case and punctuation matter.');
   - text: <code>MyComponent</code> should render to the DOM.
-    testString: 'assert(document.getElementById("challenge-node").childNodes.length === 1, "<code>MyComponent</code> should render to the DOM.");'
+    testString: assert(document.getElementById('challenge-node').childNodes.length === 1, '<code>MyComponent</code> should render to the DOM.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/react/write-a-simple-counter.english.md b/curriculum/challenges/english/03-front-end-libraries/react/write-a-simple-counter.english.md
index 9fec60b2b5..a8d475a04a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/react/write-a-simple-counter.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/react/write-a-simple-counter.english.md
@@ -21,16 +21,16 @@ The <code>Counter</code> component keeps track of a <code>count</code> value in
 
 ```yml
 tests:
-  - text: '<code>Counter</code> should return a <code>div</code> element which contains three buttons with text content in this order <code>Increment!</code>, <code>Decrement!</code>, <code>Reset</code>.'
-    testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(Counter)); return (mockedComponent.find(".inc").text() === "Increment!" && mockedComponent.find(".dec").text() === "Decrement!" && mockedComponent.find(".reset").text() === "Reset"); })(), "<code>Counter</code> should return a <code>div</code> element which contains three buttons with text content in this order <code>Increment!</code>, <code>Decrement!</code>, <code>Reset</code>.");'
+  - text: <code>Counter</code> should return a <code>div</code> element which contains three buttons with text content in this order <code>Increment!</code>, <code>Decrement!</code>, <code>Reset</code>.
+    testString: assert((() => { const mockedComponent = Enzyme.mount(React.createElement(Counter)); return (mockedComponent.find('.inc').text() === 'Increment!' && mockedComponent.find('.dec').text() === 'Decrement!' && mockedComponent.find('.reset').text() === 'Reset'); })(), '<code>Counter</code> should return a <code>div</code> element which contains three buttons with text content in this order <code>Increment!</code>, <code>Decrement!</code>, <code>Reset</code>.');
   - text: The state of <code>Counter</code> should initialize with a <code>count</code> property set to <code>0</code>.
-    testString: 'assert.strictEqual(Enzyme.mount(React.createElement(Counter)).state("count"), 0, "The state of <code>Counter</code> should initialize with a <code>count</code> property set to <code>0</code>.");'
+    testString: assert.strictEqual(Enzyme.mount(React.createElement(Counter)).state('count'), 0, 'The state of <code>Counter</code> should initialize with a <code>count</code> property set to <code>0</code>.');
   - text: Clicking the increment button should increment the count by <code>1</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Counter)); const first = () => { mockedComponent.setState({ count: 0 }); return waitForIt(() => mockedComponent.state("count")); }; const second = () => { mockedComponent.find(".inc").simulate("click"); return waitForIt(() => mockedComponent.state("count")); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === 0 && secondValue === 1, "Clicking the increment button should increment the count by <code>1</code>."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Counter)); const first = () => { mockedComponent.setState({ count: 0 }); return waitForIt(() => mockedComponent.state(''count'')); }; const second = () => { mockedComponent.find(''.inc'').simulate(''click''); return waitForIt(() => mockedComponent.state(''count'')); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === 0 && secondValue === 1, ''Clicking the increment button should increment the count by <code>1</code>.''); }; '
   - text: Clicking the decrement button should decrement the count by <code>1</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Counter)); const first = () => { mockedComponent.setState({ count: 0 }); return waitForIt(() => mockedComponent.state("count")); }; const second = () => { mockedComponent.find(".dec").simulate("click"); return waitForIt(() => mockedComponent.state("count")); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === 0 && secondValue === -1, "Clicking the decrement button should decrement the count by <code>1</code>."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Counter)); const first = () => { mockedComponent.setState({ count: 0 }); return waitForIt(() => mockedComponent.state(''count'')); }; const second = () => { mockedComponent.find(''.dec'').simulate(''click''); return waitForIt(() => mockedComponent.state(''count'')); }; const firstValue = await first(); const secondValue = await second(); assert(firstValue === 0 && secondValue === -1, ''Clicking the decrement button should decrement the count by <code>1</code>.''); }; '
   - text: Clicking the reset button should reset the count to <code>0</code>.
-    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Counter)); const init = () => { mockedComponent.setState({ count: 0 }); return waitForIt(() => mockedComponent.state("count")); }; const increment = () => { mockedComponent.find(".inc").simulate("click"); mockedComponent.find(".inc").simulate("click"); return waitForIt(() => mockedComponent.state("count")); }; const decrement = () => { mockedComponent.find(".dec").simulate("click"); return waitForIt(() => mockedComponent.state("count")); }; const reset = () => { mockedComponent.find(".reset").simulate("click"); return waitForIt(() => mockedComponent.state("count")); }; const firstValue = await init(); const secondValue = await increment(); const thirdValue = await decrement(); const fourthValue = await reset(); assert(firstValue === 0 && secondValue === 2 && thirdValue === 1 && fourthValue === 0, "Clicking the reset button should reset the count to <code>0</code>."); }; '
+    testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(Counter)); const init = () => { mockedComponent.setState({ count: 0 }); return waitForIt(() => mockedComponent.state(''count'')); }; const increment = () => { mockedComponent.find(''.inc'').simulate(''click''); mockedComponent.find(''.inc'').simulate(''click''); return waitForIt(() => mockedComponent.state(''count'')); }; const decrement = () => { mockedComponent.find(''.dec'').simulate(''click''); return waitForIt(() => mockedComponent.state(''count'')); }; const reset = () => { mockedComponent.find(''.reset'').simulate(''click''); return waitForIt(() => mockedComponent.state(''count'')); }; const firstValue = await init(); const secondValue = await increment(); const thirdValue = await decrement(); const fourthValue = await reset(); assert(firstValue === 0 && secondValue === 2 && thirdValue === 1 && fourthValue === 0, ''Clicking the reset button should reset the count to <code>0</code>.''); }; '
 
 ```
 
@@ -75,7 +75,7 @@ class Counter extends React.Component {
 <div id='jsx-teardown'>
 
 ```js
-console.info('after the test');
+ReactDOM.render(<Counter />, document.getElementById('root'))
 ```
 
 </div>
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/combine-multiple-reducers.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/combine-multiple-reducers.english.md
index 754a6f36fe..636b621578 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/combine-multiple-reducers.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/combine-multiple-reducers.english.md
@@ -25,13 +25,13 @@ There are <code>counterReducer()</code> and <code>authReducer()</code> functions
 ```yml
 tests:
   - text: The <code>counterReducer</code> should increment and decrement the <code>state</code>.
-    testString: 'assert((function() { const initalState = store.getState().count; store.dispatch({type: INCREMENT}); store.dispatch({type: INCREMENT}); const firstState = store.getState().count; store.dispatch({type: DECREMENT}); const secondState = store.getState().count; return firstState === initalState + 2 && secondState === firstState - 1  })(), "The <code>counterReducer</code> should increment and decrement the <code>state</code>.");'
+    testString: 'assert((function() { const initalState = store.getState().count; store.dispatch({type: INCREMENT}); store.dispatch({type: INCREMENT}); const firstState = store.getState().count; store.dispatch({type: DECREMENT}); const secondState = store.getState().count; return firstState === initalState + 2 && secondState === firstState - 1  })(), ''The <code>counterReducer</code> should increment and decrement the <code>state</code>.'');'
   - text: The <code>authReducer</code> should toggle the <code>state</code> of <code>authenticated</code> between <code>true</code> and <code>false</code>.
-    testString: 'assert((function() {  store.dispatch({type: LOGIN}); const loggedIn = store.getState().auth.authenticated; store.dispatch({type: LOGOUT}); const loggedOut = store.getState().auth.authenticated; return loggedIn === true && loggedOut === false  })(), "The <code>authReducer</code> should toggle the <code>state</code> of <code>authenticated</code> between <code>true</code> and <code>false</code>.");'
+    testString: 'assert((function() {  store.dispatch({type: LOGIN}); const loggedIn = store.getState().auth.authenticated; store.dispatch({type: LOGOUT}); const loggedOut = store.getState().auth.authenticated; return loggedIn === true && loggedOut === false  })(), ''The <code>authReducer</code> should toggle the <code>state</code> of <code>authenticated</code> between <code>true</code> and <code>false</code>.'');'
   - text: 'The store <code>state</code> should have two keys: <code>count</code>, which holds a number, and <code>auth</code>, which holds an object. The <code>auth</code> object should have a property of <code>authenticated</code>, which holds a boolean.'
-    testString: 'assert((function() { const state = store.getState(); return typeof state.auth === "object" && typeof state.auth.authenticated === "boolean" && typeof state.count === "number" })(), "The store <code>state</code> should have two keys: <code>count</code>, which holds a number, and <code>auth</code>, which holds an object. The <code>auth</code> object should have a property of <code>authenticated</code>, which holds a boolean.");'
+    testString: 'assert((function() { const state = store.getState(); return typeof state.auth === ''object'' && typeof state.auth.authenticated === ''boolean'' && typeof state.count === ''number'' })(), ''The store <code>state</code> should have two keys: <code>count</code>, which holds a number, and <code>auth</code>, which holds an object. The <code>auth</code> object should have a property of <code>authenticated</code>, which holds a boolean.'');'
   - text: The <code>rootReducer</code> should be a function that combines the <code>counterReducer</code> and the <code>authReducer</code>.
-    testString: 'getUserInput => assert((function() {  const noWhiteSpace = getUserInput("index").replace(/\s/g,""); return typeof rootReducer === "function" && noWhiteSpace.includes("Redux.combineReducers")  })(), "The <code>rootReducer</code> should be a function that combines the <code>counterReducer</code> and the <code>authReducer</code>.");'
+    testString: getUserInput => assert((function() {  const noWhiteSpace = getUserInput('index').replace(/\s/g,'); return typeof rootReducer === 'function' && noWhiteSpace.includes('Redux.combineReducers')  })(), 'The <code>rootReducer</code> should be a function that combines the <code>counterReducer</code> and the <code>authReducer</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/copy-an-object-with-object.assign.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/copy-an-object-with-object.assign.english.md
index 4b51beb7df..0b62c2ce53 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/copy-an-object-with-object.assign.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/copy-an-object-with-object.assign.english.md
@@ -23,13 +23,13 @@ The Redux state and actions were modified to handle an <code>object</code> for t
 ```yml
 tests:
   - text: The Redux store should exist and initialize with a state that is equivalent to the <code>defaultState</code> object declared on line 1.
-    testString: 'assert((function() { const expectedState = { user: "CamperBot", status: "offline", friends: "732,982", community: "freeCodeCamp" }; const initialState = store.getState(); return DeepEqual(expectedState, initialState); })(), "The Redux store should exist and initialize with a state that is equivalent to the <code>defaultState</code> object declared on line 1.");'
+    testString: 'assert((function() { const expectedState = { user: ''CamperBot'', status: ''offline'', friends: ''732,982'', community: ''freeCodeCamp'' }; const initialState = store.getState(); return DeepEqual(expectedState, initialState); })(), ''The Redux store should exist and initialize with a state that is equivalent to the <code>defaultState</code> object declared on line 1.'');'
   - text: <code>wakeUp</code> and <code>immutableReducer</code> both should be functions.
-    testString: 'assert(typeof wakeUp === "function" && typeof immutableReducer === "function", "<code>wakeUp</code> and <code>immutableReducer</code> both should be functions.");'
+    testString: assert(typeof wakeUp === 'function' && typeof immutableReducer === 'function', '<code>wakeUp</code> and <code>immutableReducer</code> both should be functions.');
   - text: Dispatching an action of type <code>ONLINE</code> should update the property <code>status</code> in state to <code>online</code> and should NOT mutate state.
-    testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch({type: "ONLINE"}); const finalState = store.getState(); const expectedState = { user: "CamperBot", status: "online", friends: "732,982", community: "freeCodeCamp" }; return isFrozen && DeepEqual(finalState, expectedState); })(), "Dispatching an action of type <code>ONLINE</code> should update the property <code>status</code> in state to <code>online</code> and should NOT mutate state.");'
+    testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch({type: ''ONLINE''}); const finalState = store.getState(); const expectedState = { user: ''CamperBot'', status: ''online'', friends: ''732,982'', community: ''freeCodeCamp'' }; return isFrozen && DeepEqual(finalState, expectedState); })(), ''Dispatching an action of type <code>ONLINE</code> should update the property <code>status</code> in state to <code>online</code> and should NOT mutate state.'');'
   - text: <code>Object.assign</code> should be used to return new state.
-    testString: 'getUserInput => assert(getUserInput("index").includes("Object.assign"), "<code>Object.assign</code> should be used to return new state.");'
+    testString: getUserInput => assert(getUserInput('index').includes('Object.assign'), '<code>Object.assign</code> should be used to return new state.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/create-a-redux-store.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/create-a-redux-store.english.md
index 5a20109425..0bcea9c3e9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/create-a-redux-store.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/create-a-redux-store.english.md
@@ -25,9 +25,9 @@ Declare a <code>store</code> variable and assign it to the <code>createStore()</
 ```yml
 tests:
   - text: The redux store exists.
-    testString: 'assert(typeof store.getState === "function", "The redux store exists.");'
+    testString: assert(typeof store.getState === 'function', 'The redux store exists.');
   - text: The redux store has a value of 5 for the state.
-    testString: 'assert(store.getState()=== 5, "The redux store has a value of 5 for the state.");'
+    testString: assert(store.getState()=== 5, 'The redux store has a value of 5 for the state.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/define-a-redux-action.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/define-a-redux-action.english.md
index d268aff481..db7ba00ec0 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/define-a-redux-action.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/define-a-redux-action.english.md
@@ -22,9 +22,9 @@ Writing a Redux action is as simple as declaring an object with a type property.
 ```yml
 tests:
   - text: An action object should exist.
-    testString: 'assert((function() { return typeof action === "object" })(), "An action object should exist.");'
+    testString: assert((function() { return typeof action === 'object' })(), 'An action object should exist.');
   - text: The action should have a key property type with value <code>LOGIN</code>.
-    testString: 'assert((function() { return action.type === "LOGIN" })(), "The action should have a key property type with value <code>LOGIN</code>.");'
+    testString: assert((function() { return action.type === 'LOGIN' })(), 'The action should have a key property type with value <code>LOGIN</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/define-an-action-creator.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/define-an-action-creator.english.md
index df33bf0457..ed34d453d3 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/define-an-action-creator.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/define-an-action-creator.english.md
@@ -21,11 +21,11 @@ Define a function named <code>actionCreator()</code> that returns the <code>acti
 ```yml
 tests:
   - text: The function <code>actionCreator</code> should exist.
-    testString: 'assert(typeof actionCreator === "function", "The function <code>actionCreator</code> should exist.");'
+    testString: assert(typeof actionCreator === 'function', 'The function <code>actionCreator</code> should exist.');
   - text: Running the <code>actionCreator</code> function should return the action object.
-    testString: 'assert(typeof action === "object", "Running the <code>actionCreator</code> function should return the action object.");'
+    testString: assert(typeof action === 'object', 'Running the <code>actionCreator</code> function should return the action object.');
   - text: The returned action should have a key property type with value <code>LOGIN</code>.
-    testString: 'assert(action.type === "LOGIN", "The returned action should have a key property type with value <code>LOGIN</code>.");'
+    testString: assert(action.type === 'LOGIN', 'The returned action should have a key property type with value <code>LOGIN</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/dispatch-an-action-event.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/dispatch-an-action-event.english.md
index 2a631fac5e..efe04a2e5e 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/dispatch-an-action-event.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/dispatch-an-action-event.english.md
@@ -23,11 +23,11 @@ The Redux store in the code editor has an initialized state that's an object con
 ```yml
 tests:
   - text: Calling the function <code>loginAction</code> should return an object with <code>type</code> property set to the string <code>LOGIN</code>.
-    testString: 'assert(loginAction().type === "LOGIN", "Calling the function <code>loginAction</code> should return an object with <code>type</code> property set to the string <code>LOGIN</code>.");'
+    testString: assert(loginAction().type === 'LOGIN', 'Calling the function <code>loginAction</code> should return an object with <code>type</code> property set to the string <code>LOGIN</code>.');
   - text: The store should be initialized with an object with property <code>login</code> set to <code>false</code>.
-    testString: 'assert(store.getState().login === false, "The store should be initialized with an object with property <code>login</code> set to <code>false</code>.");'
+    testString: assert(store.getState().login === false, 'The store should be initialized with an object with property <code>login</code> set to <code>false</code>.');
   - text: The <code>store.dispatch()</code> method should be used to dispatch an action of type <code>LOGIN</code>.
-    testString: 'getUserInput => assert((function() {  let noWhiteSpace = getUserInput("index").replace(/\s/g,""); return noWhiteSpace.includes("store.dispatch(loginAction())") || noWhiteSpace.includes("store.dispatch({type: \"LOGIN\"})") === true })(), "The <code>store.dispatch()</code> method should be used to dispatch an action of type <code>LOGIN</code>.");'
+    testString: 'getUserInput => assert((function() {  let noWhiteSpace = getUserInput(''index'').replace(/\s/g,''); return noWhiteSpace.includes(''store.dispatch(loginAction())'') || noWhiteSpace.includes(''store.dispatch({type: \''LOGIN\''})'') === true })(), ''The <code>store.dispatch()</code> method should be used to dispatch an action of type <code>LOGIN</code>.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/get-state-from-the-redux-store.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/get-state-from-the-redux-store.english.md
index 1526f407de..5a6029ab7c 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/get-state-from-the-redux-store.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/get-state-from-the-redux-store.english.md
@@ -21,9 +21,9 @@ The code from the previous challenge is re-written more concisely in the code ed
 ```yml
 tests:
   - text: The redux store should have a value of 5 for the initial state.
-    testString: 'assert(store.getState()===5, "The redux store should have a value of 5 for the initial state.");'
+    testString: assert(store.getState()===5, 'The redux store should have a value of 5 for the initial state.');
   - text: A variable <code>currentState</code> should exist and should be assigned the current state of the Redux store.
-    testString: 'getUserInput => assert(currentState === 5 && getUserInput("index").includes("store.getState()"), "A variable <code>currentState</code> should exist and should be assigned the current state of the Redux store.");'
+    testString: getUserInput => assert(currentState === 5 && getUserInput('index').includes('store.getState()'), 'A variable <code>currentState</code> should exist and should be assigned the current state of the Redux store.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/handle-an-action-in-the-store.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/handle-an-action-in-the-store.english.md
index 0501a62106..d49dbd86b9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/handle-an-action-in-the-store.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/handle-an-action-in-the-store.english.md
@@ -22,13 +22,13 @@ The code editor has the previous example as well as the start of a <code>reducer
 ```yml
 tests:
   - text: Calling the function <code>loginAction</code> should return an object with type property set to the string <code>LOGIN</code>.
-    testString: 'assert(loginAction().type === "LOGIN", "Calling the function <code>loginAction</code> should return an object with type property set to the string <code>LOGIN</code>.");'
+    testString: assert(loginAction().type === 'LOGIN', 'Calling the function <code>loginAction</code> should return an object with type property set to the string <code>LOGIN</code>.');
   - text: The store should be initialized with an object with property <code>login</code> set to <code>false</code>.
-    testString: 'assert(store.getState().login === false, "The store should be initialized with an object with property <code>login</code> set to <code>false</code>.");'
+    testString: assert(store.getState().login === false, 'The store should be initialized with an object with property <code>login</code> set to <code>false</code>.');
   - text: Dispatching <code>loginAction</code> should update the <code>login</code> property in the store state to <code>true</code>.
-    testString: 'assert((function() {  const initialState = store.getState(); store.dispatch(loginAction()); const afterState = store.getState(); return initialState.login === false && afterState.login === true })(), "Dispatching <code>loginAction</code> should update the <code>login</code> property in the store state to <code>true</code>.");'
-  - text: 'If the action is not of type <code>LOGIN</code>, the store should return the current state.'
-    testString: 'assert((function() { store.dispatch({type: "__TEST__ACTION__"}); let afterTest = store.getState(); return typeof afterTest === "object" && afterTest.hasOwnProperty("login") })(), "If the action is not of type <code>LOGIN</code>, the store should return the current state.");'
+    testString: assert((function() {  const initialState = store.getState(); store.dispatch(loginAction()); const afterState = store.getState(); return initialState.login === false && afterState.login === true })(), 'Dispatching <code>loginAction</code> should update the <code>login</code> property in the store state to <code>true</code>.');
+  - text: If the action is not of type <code>LOGIN</code>, the store should return the current state.
+    testString: 'assert((function() { store.dispatch({type: ''__TEST__ACTION__''}); let afterTest = store.getState(); return typeof afterTest === ''object'' && afterTest.hasOwnProperty(''login'') })(), ''If the action is not of type <code>LOGIN</code>, the store should return the current state.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/never-mutate-state.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/never-mutate-state.english.md
index a9c4da27d6..cfa1500a8a 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/never-mutate-state.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/never-mutate-state.english.md
@@ -23,11 +23,11 @@ There is a <code>store</code> and <code>reducer</code> in the code editor for ma
 ```yml
 tests:
   - text: The Redux store should exist and initialize with a state equal to the <code>todos</code> array in the code editor.
-    testString: 'assert((function() { const todos = [ "Go to the store", "Clean the house", "Cook dinner", "Learn to code" ]; const initialState = store.getState(); return Array.isArray(initialState) && initialState.join(",") === todos.join(","); })(), "The Redux store should exist and initialize with a state equal to the <code>todos</code> array in the code editor.");'
+    testString: assert((function() { const todos = [ 'Go to the store', 'Clean the house', 'Cook dinner', 'Learn to code' ]; const initialState = store.getState(); return Array.isArray(initialState) && initialState.join(',') === todos.join(','); })(), 'The Redux store should exist and initialize with a state equal to the <code>todos</code> array in the code editor.');
   - text: <code>addToDo</code> and <code>immutableReducer</code> both should be functions.
-    testString: 'assert(typeof addToDo === "function" && typeof immutableReducer === "function", "<code>addToDo</code> and <code>immutableReducer</code> both should be functions.");'
+    testString: assert(typeof addToDo === 'function' && typeof immutableReducer === 'function', '<code>addToDo</code> and <code>immutableReducer</code> both should be functions.');
   - text: Dispatching an action of type <code>ADD_TO_DO</code> on the Redux store should add a <code>todo</code> item and should NOT mutate state.
-    testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(addToDo("__TEST__TO__DO__")); const finalState = store.getState(); const expectedState = [ "Go to the store", "Clean the house", "Cook dinner", "Learn to code", "__TEST__TO__DO__" ]; return( isFrozen && DeepEqual(finalState, expectedState)); })(), "Dispatching an action of type <code>ADD_TO_DO</code> on the Redux store should add a <code>todo</code> item and should NOT mutate state.");'
+    testString: assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(addToDo('__TEST__TO__DO__')); const finalState = store.getState(); const expectedState = [ 'Go to the store', 'Clean the house', 'Cook dinner', 'Learn to code', '__TEST__TO__DO__' ]; return( isFrozen && DeepEqual(finalState, expectedState)); })(), 'Dispatching an action of type <code>ADD_TO_DO</code> on the Redux store should add a <code>todo</code> item and should NOT mutate state.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/register-a-store-listener.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/register-a-store-listener.english.md
index a27d245c9e..e2fba328e9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/register-a-store-listener.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/register-a-store-listener.english.md
@@ -21,11 +21,11 @@ Write a callback function that increments the global variable <code>count</code>
 ```yml
 tests:
   - text: Dispatching the <code>ADD</code> action on the store should increment the state by <code>1</code>.
-    testString: 'assert((function() { const initialState = store.getState(); store.dispatch({ type: "ADD" }); const newState = store.getState(); return newState === (initialState + 1); })(), "Dispatching the <code>ADD</code> action on the store should increment the state by <code>1</code>.");'
+    testString: 'assert((function() { const initialState = store.getState(); store.dispatch({ type: ''ADD'' }); const newState = store.getState(); return newState === (initialState + 1); })(), ''Dispatching the <code>ADD</code> action on the store should increment the state by <code>1</code>.'');'
   - text: There should be a listener function subscribed to the store using <code>store.subscribe</code>.
-    testString: 'getUserInput => assert(getUserInput("index").includes("store.subscribe("), "There should be a listener function subscribed to the store using <code>store.subscribe</code>.");'
+    testString: getUserInput => assert(getUserInput('index').includes('store.subscribe('), 'There should be a listener function subscribed to the store using <code>store.subscribe</code>.');
   - text: The callback to <code>store.subscribe</code> should also increment the global <code>count</code> variable as the store is updated.
-    testString: 'assert(store.getState() === count, "The callback to <code>store.subscribe</code> should also increment the global <code>count</code> variable as the store is updated.");'
+    testString: assert(store.getState() === count, 'The callback to <code>store.subscribe</code> should also increment the global <code>count</code> variable as the store is updated.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/remove-an-item-from-an-array.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/remove-an-item-from-an-array.english.md
index 6d3afbd6c3..4a1fe48d28 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/remove-an-item-from-an-array.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/remove-an-item-from-an-array.english.md
@@ -20,12 +20,12 @@ The reducer and action creator were modified to remove an item from an array bas
 
 ```yml
 tests:
-  - text: 'The Redux store should exist and initialize with a state equal to <code>[0,1,2,3,4,5]</code>'
-    testString: 'assert((function() { const initialState = store.getState(); return (Array.isArray(initialState) === true && DeepEqual(initialState, [0, 1, 2, 3, 4, 5])); })(), "The Redux store should exist and initialize with a state equal to <code>[0,1,2,3,4,5]</code>");'
+  - text: The Redux store should exist and initialize with a state equal to <code>[0,1,2,3,4,5]</code>
+    testString: assert((function() { const initialState = store.getState(); return (Array.isArray(initialState) === true && DeepEqual(initialState, [0, 1, 2, 3, 4, 5])); })(), 'The Redux store should exist and initialize with a state equal to <code>[0,1,2,3,4,5]</code>');
   - text: <code>removeItem</code> and <code>immutableReducer</code> both should be functions.
-    testString: 'assert(typeof removeItem === "function" && typeof immutableReducer === "function", "<code>removeItem</code> and <code>immutableReducer</code> both should be functions.");'
+    testString: assert(typeof removeItem === 'function' && typeof immutableReducer === 'function', '<code>removeItem</code> and <code>immutableReducer</code> both should be functions.');
   - text: Dispatching the <code>removeItem</code> action creator should remove items from the state and should NOT mutate state.
-    testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(removeItem(3)); const state_1 = store.getState(); store.dispatch(removeItem(2)); const state_2 = store.getState(); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); const state_3 = store.getState(); return isFrozen && DeepEqual(state_1, [0, 1, 2, 4, 5]) && DeepEqual(state_2, [0, 1, 4, 5]) && DeepEqual(state_3, [5]); })(), "Dispatching the <code>removeItem</code> action creator should remove items from the state and should NOT mutate state.");'
+    testString: assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(removeItem(3)); const state_1 = store.getState(); store.dispatch(removeItem(2)); const state_2 = store.getState(); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); store.dispatch(removeItem(0)); const state_3 = store.getState(); return isFrozen && DeepEqual(state_1, [0, 1, 2, 4, 5]) && DeepEqual(state_2, [0, 1, 4, 5]) && DeepEqual(state_3, [5]); })(), 'Dispatching the <code>removeItem</code> action creator should remove items from the state and should NOT mutate state.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/send-action-data-to-the-store.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/send-action-data-to-the-store.english.md
index ccdb124193..3d07c518b9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/send-action-data-to-the-store.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/send-action-data-to-the-store.english.md
@@ -23,9 +23,9 @@ The action is dispatched at the bottom of the code. Once you're finished, run th
 ```yml
 tests:
   - text: The action creator <code>addNoteText</code> should return an object with keys <code>type</code> and <code>text</code>.
-    testString: 'assert((function() { const addNoteFn = addNoteText("__TEST__NOTE"); return addNoteFn.type === ADD_NOTE && addNoteFn.text === "__TEST__NOTE" })(), "The action creator <code>addNoteText</code> should return an object with keys <code>type</code> and <code>text</code>.");'
+    testString: assert((function() { const addNoteFn = addNoteText('__TEST__NOTE'); return addNoteFn.type === ADD_NOTE && addNoteFn.text === '__TEST__NOTE' })(), 'The action creator <code>addNoteText</code> should return an object with keys <code>type</code> and <code>text</code>.');
   - text: Dispatching an action of type <code>ADD_NOTE</code> with the <code>addNoteText</code> action creator should update the <code>state</code> to the string passed to the action creator.
-    testString: 'assert((function() { const initialState = store.getState(); store.dispatch(addNoteText("__TEST__NOTE")); const newState = store.getState(); return initialState !== newState && newState === "__TEST__NOTE" })(), "Dispatching an action of type <code>ADD_NOTE</code> with the <code>addNoteText</code> action creator should update the <code>state</code> to the string passed to the action creator.");'
+    testString: assert((function() { const initialState = store.getState(); store.dispatch(addNoteText('__TEST__NOTE')); const newState = store.getState(); return initialState !== newState && newState === '__TEST__NOTE' })(), 'Dispatching an action of type <code>ADD_NOTE</code> with the <code>addNoteText</code> action creator should update the <code>state</code> to the string passed to the action creator.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.english.md
index ec7165707e..329b14d213 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.english.md
@@ -22,17 +22,17 @@ The code editor has a store, actions, and action creators set up for you. Fill i
 ```yml
 tests:
   - text: Calling the function <code>loginUser</code> should return an object with type property set to the string <code>LOGIN</code>.
-    testString: 'assert(loginUser().type === "LOGIN", "Calling the function <code>loginUser</code> should return an object with type property set to the string <code>LOGIN</code>.");'
+    testString: assert(loginUser().type === 'LOGIN', 'Calling the function <code>loginUser</code> should return an object with type property set to the string <code>LOGIN</code>.');
   - text: Calling the function <code>logoutUser</code> should return an object with type property set to the string <code>LOGOUT</code>.
-    testString: 'assert(logoutUser().type === "LOGOUT", "Calling the function <code>logoutUser</code> should return an object with type property set to the string <code>LOGOUT</code>.");'
+    testString: assert(logoutUser().type === 'LOGOUT', 'Calling the function <code>logoutUser</code> should return an object with type property set to the string <code>LOGOUT</code>.');
   - text: The store should be initialized with an object with an <code>authenticated</code> property set to <code>false</code>.
-    testString: 'assert(store.getState().authenticated === false, "The store should be initialized with an object with an <code>authenticated</code> property set to <code>false</code>.");'
+    testString: assert(store.getState().authenticated === false, 'The store should be initialized with an object with an <code>authenticated</code> property set to <code>false</code>.');
   - text: Dispatching <code>loginUser</code> should update the <code>authenticated</code> property in the store state to <code>true</code>.
-    testString: 'assert((function() {  const initialState = store.getState(); store.dispatch(loginUser()); const afterLogin = store.getState(); return initialState.authenticated === false && afterLogin.authenticated === true })(), "Dispatching <code>loginUser</code> should update the <code>authenticated</code> property in the store state to <code>true</code>.");'
+    testString: assert((function() {  const initialState = store.getState(); store.dispatch(loginUser()); const afterLogin = store.getState(); return initialState.authenticated === false && afterLogin.authenticated === true })(), 'Dispatching <code>loginUser</code> should update the <code>authenticated</code> property in the store state to <code>true</code>.');
   - text: Dispatching <code>logoutUser</code> should update the <code>authenticated</code> property in the store state to <code>false</code>.
-    testString: 'assert((function() {  store.dispatch(loginUser()); const loggedIn = store.getState(); store.dispatch(logoutUser()); const afterLogout = store.getState(); return loggedIn.authenticated === true && afterLogout.authenticated === false  })(), "Dispatching <code>logoutUser</code> should update the <code>authenticated</code> property in the store state to <code>false</code>.");'
+    testString: assert((function() {  store.dispatch(loginUser()); const loggedIn = store.getState(); store.dispatch(logoutUser()); const afterLogout = store.getState(); return loggedIn.authenticated === true && afterLogout.authenticated === false  })(), 'Dispatching <code>logoutUser</code> should update the <code>authenticated</code> property in the store state to <code>false</code>.');
   - text: The <code>authReducer</code> function should handle multiple action types with a <code>switch</code> statement.
-    testString: 'getUserInput => assert( getUserInput("index").toString().includes("switch") && getUserInput("index").toString().includes("case") && getUserInput("index").toString().includes("default"), "The <code>authReducer</code> function should handle multiple action types with a <code>switch</code> statement.");'
+    testString: getUserInput => assert( getUserInput('index').toString().includes('switch') && getUserInput('index').toString().includes('case') && getUserInput('index').toString().includes('default'), 'The <code>authReducer</code> function should handle multiple action types with a <code>switch</code> statement.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/use-const-for-action-types.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/use-const-for-action-types.english.md
index 80c37356c1..e0ff5c6561 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/use-const-for-action-types.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/use-const-for-action-types.english.md
@@ -22,21 +22,21 @@ Declare <code>LOGIN</code> and <code>LOGOUT</code> as <code>const</code> values
 ```yml
 tests:
   - text: Calling the function <code>loginUser</code> should return an object with <code>type</code> property set to the string <code>LOGIN</code>.
-    testString: 'assert(loginUser().type === "LOGIN", "Calling the function <code>loginUser</code> should return an object with <code>type</code> property set to the string <code>LOGIN</code>.");'
+    testString: assert(loginUser().type === 'LOGIN', 'Calling the function <code>loginUser</code> should return an object with <code>type</code> property set to the string <code>LOGIN</code>.');
   - text: Calling the function <code>logoutUser</code> should return an object with <code>type</code> property set to the string <code>LOGOUT</code>.
-    testString: 'assert(logoutUser().type === "LOGOUT", "Calling the function <code>logoutUser</code> should return an object with <code>type</code> property set to the string <code>LOGOUT</code>.");'
+    testString: assert(logoutUser().type === 'LOGOUT', 'Calling the function <code>logoutUser</code> should return an object with <code>type</code> property set to the string <code>LOGOUT</code>.');
   - text: The store should be initialized with an object with property <code>login</code> set to <code>false</code>.
-    testString: 'assert(store.getState().authenticated === false, "The store should be initialized with an object with property <code>login</code> set to <code>false</code>.");'
+    testString: assert(store.getState().authenticated === false, 'The store should be initialized with an object with property <code>login</code> set to <code>false</code>.');
   - text: Dispatching <code>loginUser</code> should update the <code>login</code> property in the store state to <code>true</code>.
-    testString: 'assert((function() {  const initialState = store.getState(); store.dispatch(loginUser()); const afterLogin = store.getState(); return initialState.authenticated === false && afterLogin.authenticated === true })(), "Dispatching <code>loginUser</code> should update the <code>login</code> property in the store state to <code>true</code>.");'
+    testString: assert((function() {  const initialState = store.getState(); store.dispatch(loginUser()); const afterLogin = store.getState(); return initialState.authenticated === false && afterLogin.authenticated === true })(), 'Dispatching <code>loginUser</code> should update the <code>login</code> property in the store state to <code>true</code>.');
   - text: Dispatching <code>logoutUser</code> should update the <code>login</code> property in the store state to <code>false</code>.
-    testString: 'assert((function() {  store.dispatch(loginUser()); const loggedIn = store.getState(); store.dispatch(logoutUser()); const afterLogout = store.getState(); return loggedIn.authenticated === true && afterLogout.authenticated === false })(), "Dispatching <code>logoutUser</code> should update the <code>login</code> property in the store state to <code>false</code>.");'
+    testString: assert((function() {  store.dispatch(loginUser()); const loggedIn = store.getState(); store.dispatch(logoutUser()); const afterLogout = store.getState(); return loggedIn.authenticated === true && afterLogout.authenticated === false })(), 'Dispatching <code>logoutUser</code> should update the <code>login</code> property in the store state to <code>false</code>.');
   - text: The <code>authReducer</code> function should handle multiple action types with a switch statement.
-    testString: 'getUserInput => assert((function() { return typeof authReducer === "function" && getUserInput("index").toString().includes("switch") && getUserInput("index").toString().includes("case") && getUserInput("index").toString().includes("default") })(), "The <code>authReducer</code> function should handle multiple action types with a switch statement.");'
+    testString: getUserInput => assert((function() { return typeof authReducer === 'function' && getUserInput('index').toString().includes('switch') && getUserInput('index').toString().includes('case') && getUserInput('index').toString().includes('default') })(), 'The <code>authReducer</code> function should handle multiple action types with a switch statement.');
   - text: <code>LOGIN</code> and <code>LOGOUT</code> should be declared as <code>const</code> values and should be assigned strings of <code>LOGIN</code>and <code>LOGOUT</code>.
-    testString: 'getUserInput => assert((function() {  const noWhiteSpace = getUserInput("index").toString().replace(/\s/g,""); return (noWhiteSpace.includes("constLOGIN=\"LOGIN\"") || noWhiteSpace.includes("constLOGIN="LOGIN"")) && (noWhiteSpace.includes("constLOGOUT=\"LOGOUT\"") || noWhiteSpace.includes("constLOGOUT="LOGOUT"")) })(), "<code>LOGIN</code> and <code>LOGOUT</code> should be declared as <code>const</code> values and should be assigned strings of <code>LOGIN</code>and <code>LOGOUT</code>.");'
+    testString: getUserInput => assert((function() {  const noWhiteSpace = getUserInput('index').toString().replace(/\s/g,'); return (noWhiteSpace.includes('constLOGIN=\'LOGIN\') || noWhiteSpace.includes('constLOGIN="LOGIN"')) && (noWhiteSpace.includes('constLOGOUT=\'LOGOUT\') || noWhiteSpace.includes('constLOGOUT="LOGOUT"')) })(), '<code>LOGIN</code> and <code>LOGOUT</code> should be declared as <code>const</code> values and should be assigned strings of <code>LOGIN</code>and <code>LOGOUT</code>.');
   - text: The action creators and the reducer should reference the <code>LOGIN</code> and <code>LOGOUT</code> constants.
-    testString: 'getUserInput => assert((function() { const noWhiteSpace = getUserInput("index").toString().replace(/\s/g,""); return noWhiteSpace.includes("caseLOGIN:") && noWhiteSpace.includes("caseLOGOUT:") && noWhiteSpace.includes("type:LOGIN") && noWhiteSpace.includes("type:LOGOUT") })(), "The action creators and the reducer should reference the <code>LOGIN</code> and <code>LOGOUT</code> constants.");'
+    testString: getUserInput => assert((function() { const noWhiteSpace = getUserInput('index').toString().replace(/\s/g,'); return noWhiteSpace.includes('caseLOGIN:') && noWhiteSpace.includes('caseLOGOUT:') && noWhiteSpace.includes('type:LOGIN') && noWhiteSpace.includes('type:LOGOUT') })(), 'The action creators and the reducer should reference the <code>LOGIN</code> and <code>LOGOUT</code> constants.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.english.md
index ffaf34a385..34622143f2 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.english.md
@@ -24,15 +24,15 @@ Write both dispatches in the <code>handleAsync()</code> action creator. Dispatch
 ```yml
 tests:
   - text: The <code>requestingData</code> action creator should return an object of type equal to the value of <code>REQUESTING_DATA</code>.
-    testString: 'assert(requestingData().type === REQUESTING_DATA, "The <code>requestingData</code> action creator should return an object of type equal to the value of <code>REQUESTING_DATA</code>.");'
+    testString: assert(requestingData().type === REQUESTING_DATA, 'The <code>requestingData</code> action creator should return an object of type equal to the value of <code>REQUESTING_DATA</code>.');
   - text: The <code>receivedData</code> action creator should return an object of type equal to the value of <code>RECEIVED_DATA</code>.
-    testString: 'assert(receivedData("data").type === RECEIVED_DATA, "The <code>receivedData</code> action creator should return an object of type equal to the value of <code>RECEIVED_DATA</code>.");'
+    testString: assert(receivedData('data').type === RECEIVED_DATA, 'The <code>receivedData</code> action creator should return an object of type equal to the value of <code>RECEIVED_DATA</code>.');
   - text: <code>asyncDataReducer</code> should be a function.
-    testString: 'assert(typeof asyncDataReducer === "function", "<code>asyncDataReducer</code> should be a function.");'
+    testString: assert(typeof asyncDataReducer === 'function', '<code>asyncDataReducer</code> should be a function.');
   - text: Dispatching the requestingData action creator should update the store <code>state</code> property of fetching to <code>true</code>.
-    testString: 'assert((function() { const initialState = store.getState(); store.dispatch(requestingData()); const reqState = store.getState(); return initialState.fetching === false && reqState.fetching === true })(), "Dispatching the requestingData action creator should update the store <code>state</code> property of fetching to <code>true</code>.");'
+    testString: assert((function() { const initialState = store.getState(); store.dispatch(requestingData()); const reqState = store.getState(); return initialState.fetching === false && reqState.fetching === true })(), 'Dispatching the requestingData action creator should update the store <code>state</code> property of fetching to <code>true</code>.');
   - text: Dispatching <code>handleAsync</code> should dispatch the data request action and then dispatch the received data action after a delay.
-    testString: 'assert((function() { const noWhiteSpace = handleAsync.toString().replace(/\s/g,""); return noWhiteSpace.includes("dispatch(requestingData())") === true && noWhiteSpace.includes("dispatch(receivedData(data))") === true })(), "Dispatching <code>handleAsync</code> should dispatch the data request action and then dispatch the received data action after a delay.");'
+    testString: assert((function() { const noWhiteSpace = handleAsync.toString().replace(/\s/g,''); return noWhiteSpace.includes('dispatch(requestingData())') === true && noWhiteSpace.includes('dispatch(receivedData(data))') === true })(), 'Dispatching <code>handleAsync</code> should dispatch the data request action and then dispatch the received data action after a delay.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.english.md
index b6573b51ef..bceef79c8b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.english.md
@@ -22,14 +22,14 @@ Use the spread operator to return a new copy of state when a to-do is added.
 
 ```yml
 tests:
-  - text: 'The Redux store should exist and initialize with a state equal to <code>[Do not mutate state!]</code>.'
-    testString: 'assert((function() { const initialState = store.getState(); return ( Array.isArray(initialState) === true && initialState[0] === "Do not mutate state!"); })(), "The Redux store should exist and initialize with a state equal to <code>[Do not mutate state!]</code>.");'
+  - text: The Redux store should exist and initialize with a state equal to <code>[Do not mutate state!]</code>.
+    testString: assert((function() { const initialState = store.getState(); return ( Array.isArray(initialState) === true && initialState[0] === 'Do not mutate state!'); })(), 'The Redux store should exist and initialize with a state equal to <code>[Do not mutate state!]</code>.');
   - text: <code>addToDo</code> and <code>immutableReducer</code> both should be functions.
-    testString: 'assert(typeof addToDo === "function" && typeof immutableReducer === "function", "<code>addToDo</code> and <code>immutableReducer</code> both should be functions.");'
+    testString: assert(typeof addToDo === 'function' && typeof immutableReducer === 'function', '<code>addToDo</code> and <code>immutableReducer</code> both should be functions.');
   - text: Dispatching an action of type <code>ADD_TO_DO</code> on the Redux store should add a <code>todo</code> item and should NOT mutate state.
-    testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(addToDo("__TEST__TO__DO__")); const finalState = store.getState(); const expectedState = [ "Do not mutate state!", "__TEST__TO__DO__" ]; return( isFrozen && DeepEqual(finalState, expectedState)); })(), "Dispatching an action of type <code>ADD_TO_DO</code> on the Redux store should add a <code>todo</code> item and should NOT mutate state.");'
+    testString: assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch(addToDo('__TEST__TO__DO__')); const finalState = store.getState(); const expectedState = [ 'Do not mutate state!', '__TEST__TO__DO__' ]; return( isFrozen && DeepEqual(finalState, expectedState)); })(), 'Dispatching an action of type <code>ADD_TO_DO</code> on the Redux store should add a <code>todo</code> item and should NOT mutate state.');
   - text: The spread operator should be used to return new state.
-    testString: 'getUserInput => assert(getUserInput("index").includes("...state"), "The spread operator should be used to return new state.");'
+    testString: getUserInput => assert(getUserInput('index').includes('...state'), 'The spread operator should be used to return new state.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/redux/write-a-counter-with-redux.english.md b/curriculum/challenges/english/03-front-end-libraries/redux/write-a-counter-with-redux.english.md
index 5aeaba480f..8b20a846b1 100644
--- a/curriculum/challenges/english/03-front-end-libraries/redux/write-a-counter-with-redux.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/redux/write-a-counter-with-redux.english.md
@@ -21,17 +21,17 @@ In this lesson, you'll implement a simple counter with Redux from scratch. The b
 ```yml
 tests:
   - text: The action creator <code>incAction</code> should return an action object with <code>type</code> equal to the value of <code>INCREMENT</code>
-    testString: 'assert(incAction().type ===INCREMENT, "The action creator <code>incAction</code> should return an action object with <code>type</code> equal to the value of <code>INCREMENT</code>");'
+    testString: assert(incAction().type ===INCREMENT, 'The action creator <code>incAction</code> should return an action object with <code>type</code> equal to the value of <code>INCREMENT</code>');
   - text: The action creator <code>decAction</code> should return an action object with <code>type</code> equal to the value of <code>DECREMENT</code>
-    testString: 'assert(decAction().type === DECREMENT, "The action creator <code>decAction</code> should return an action object with <code>type</code> equal to the value of <code>DECREMENT</code>");'
+    testString: assert(decAction().type === DECREMENT, 'The action creator <code>decAction</code> should return an action object with <code>type</code> equal to the value of <code>DECREMENT</code>');
   - text: The Redux store should initialize with a <code>state</code> of 0.
-    testString: 'assert(store.getState() === 0, "The Redux store should initialize with a <code>state</code> of 0.");'
+    testString: assert(store.getState() === 0, 'The Redux store should initialize with a <code>state</code> of 0.');
   - text: Dispatching <code>incAction</code> on the Redux store should increment the <code>state</code> by 1.
-    testString: 'assert((function() { const initialState = store.getState(); store.dispatch(incAction()); const incState = store.getState(); return initialState + 1 === incState })(), "Dispatching <code>incAction</code> on the Redux store should increment the <code>state</code> by 1.");'
+    testString: assert((function() { const initialState = store.getState(); store.dispatch(incAction()); const incState = store.getState(); return initialState + 1 === incState })(), 'Dispatching <code>incAction</code> on the Redux store should increment the <code>state</code> by 1.');
   - text: Dispatching <code>decAction</code> on the Redux store should decrement the <code>state</code> by 1.
-    testString: 'assert((function() { const initialState = store.getState(); store.dispatch(decAction()); const decState = store.getState(); return initialState - 1 === decState })(), "Dispatching <code>decAction</code> on the Redux store should decrement the <code>state</code> by 1.");'
+    testString: assert((function() { const initialState = store.getState(); store.dispatch(decAction()); const decState = store.getState(); return initialState - 1 === decState })(), 'Dispatching <code>decAction</code> on the Redux store should decrement the <code>state</code> by 1.');
   - text: <code>counterReducer</code> should be a function
-    testString: 'assert(typeof counterReducer === "function", "<code>counterReducer</code> should be a function");'
+    testString: assert(typeof counterReducer === 'function', '<code>counterReducer</code> should be a function');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/apply-a-style-until-a-condition-is-met-with-while.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/apply-a-style-until-a-condition-is-met-with-while.english.md
index 23fb6f271d..3a09c859e9 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/apply-a-style-until-a-condition-is-met-with-while.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/apply-a-style-until-a-condition-is-met-with-while.english.md
@@ -28,31 +28,31 @@ There should be 10 different classes from <code>text-1</code> to <code>text-10</
 ```yml
 tests:
   - text: Your code should use the <code>@while</code> directive.
-    testString: 'assert(code.match(/@while /g), "Your code should use the <code>@while</code> directive.");'
+    testString: assert(code.match(/@while /g), 'Your code should use the <code>@while</code> directive.');
   - text: Your code should set an index variable to 1 to start.
-    testString: 'assert(code.match(/\$.*:\s*?1;/gi), "Your code should set an index variable to 1 to start.");'
+    testString: assert(code.match(/\$.*:\s*?1;/gi), 'Your code should set an index variable to 1 to start.');
   - text: Your code should increment the counter variable.
-    testString: 'assert(code.match(/\$(.*):\s*?\$\1\s*?\+\s*?1;/gi), "Your code should increment the counter variable.");'
+    testString: assert(code.match(/\$(.*):\s*?\$\1\s*?\+\s*?1;/gi), 'Your code should increment the counter variable.');
   - text: Your <code>.text-1</code> class should have a <code>font-size</code> of 5px.
-    testString: 'assert($(".text-1").css("font-size") == "5px", "Your <code>.text-1</code> class should have a <code>font-size</code> of 5px.");'
+    testString: assert($('.text-1').css('font-size') == '5px', 'Your <code>.text-1</code> class should have a <code>font-size</code> of 5px.');
   - text: Your <code>.text-2</code> class should have a <code>font-size</code> of 10px.
-    testString: 'assert($(".text-2").css("font-size") == "10px", "Your <code>.text-2</code> class should have a <code>font-size</code> of 10px.");'
+    testString: assert($('.text-2').css('font-size') == '10px', 'Your <code>.text-2</code> class should have a <code>font-size</code> of 10px.');
   - text: Your <code>.text-3</code> class should have a <code>font-size</code> of 15px.
-    testString: 'assert($(".text-3").css("font-size") == "15px", "Your <code>.text-3</code> class should have a <code>font-size</code> of 15px.");'
+    testString: assert($('.text-3').css('font-size') == '15px', 'Your <code>.text-3</code> class should have a <code>font-size</code> of 15px.');
   - text: Your <code>.text-4</code> class should have a <code>font-size</code> of 20px.
-    testString: 'assert($(".text-4").css("font-size") == "20px", "Your <code>.text-4</code> class should have a <code>font-size</code> of 20px.");'
+    testString: assert($('.text-4').css('font-size') == '20px', 'Your <code>.text-4</code> class should have a <code>font-size</code> of 20px.');
   - text: Your <code>.text-5</code> class should have a <code>font-size</code> of 25px.
-    testString: 'assert($(".text-5").css("font-size") == "25px", "Your <code>.text-5</code> class should have a <code>font-size</code> of 25px.");'
+    testString: assert($('.text-5').css('font-size') == '25px', 'Your <code>.text-5</code> class should have a <code>font-size</code> of 25px.');
   - text: Your <code>.text-6</code> class should have a <code>font-size</code> of 30px.
-    testString: 'assert($(".text-6").css("font-size") == "30px", "Your <code>.text-6</code> class should have a <code>font-size</code> of 30px.");'
+    testString: assert($('.text-6').css('font-size') == '30px', 'Your <code>.text-6</code> class should have a <code>font-size</code> of 30px.');
   - text: Your <code>.text-7</code> class should have a <code>font-size</code> of 35px.
-    testString: 'assert($(".text-7").css("font-size") == "35px", "Your <code>.text-7</code> class should have a <code>font-size</code> of 35px.");'
+    testString: assert($('.text-7').css('font-size') == '35px', 'Your <code>.text-7</code> class should have a <code>font-size</code> of 35px.');
   - text: Your <code>.text-8</code> class should have a <code>font-size</code> of 40px.
-    testString: 'assert($(".text-8").css("font-size") == "40px", "Your <code>.text-8</code> class should have a <code>font-size</code> of 40px.");'
+    testString: assert($('.text-8').css('font-size') == '40px', 'Your <code>.text-8</code> class should have a <code>font-size</code> of 40px.');
   - text: Your <code>.text-9</code> class should have a <code>font-size</code> of 45px.
-    testString: 'assert($(".text-9").css("font-size") == "45px", "Your <code>.text-9</code> class should have a <code>font-size</code> of 45px.");'
+    testString: assert($('.text-9').css('font-size') == '45px', 'Your <code>.text-9</code> class should have a <code>font-size</code> of 45px.');
   - text: Your <code>.text-10</code> class should have a <code>font-size</code> of 50px.
-    testString: 'assert($(".text-10").css("font-size") == "50px", "Your <code>.text-10</code> class should have a <code>font-size</code> of 50px.");'
+    testString: assert($('.text-10').css('font-size') == '50px', 'Your <code>.text-10</code> class should have a <code>font-size</code> of 50px.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/create-reusable-css-with-mixins.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/create-reusable-css-with-mixins.english.md
index bd3a081f15..06e993b6b7 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/create-reusable-css-with-mixins.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/create-reusable-css-with-mixins.english.md
@@ -31,17 +31,17 @@ Write a <code>mixin</code> for <code>border-radius</code> and give it a <code>$r
 ```yml
 tests:
   - text: Your code should declare a <code>mixin</code> named <code>border-radius</code> which has a parameter named <code>$radius</code>.
-    testString: 'assert(code.match(/@mixin\s+?border-radius\s*?\(\s*?\$radius\s*?\)\s*?{/gi), "Your code should declare a <code>mixin</code> named <code>border-radius</code> which has a parameter named <code>$radius</code>.");'
+    testString: assert(code.match(/@mixin\s+?border-radius\s*?\(\s*?\$radius\s*?\)\s*?{/gi), 'Your code should declare a <code>mixin</code> named <code>border-radius</code> which has a parameter named <code>$radius</code>.');
   - text: Your code should include the <code>-webkit-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.
-    testString: 'assert(code.match(/-webkit-border-radius:\s*?\$radius;/gi), "Your code should include the <code>-webkit-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.");'
+    testString: assert(code.match(/-webkit-border-radius:\s*?\$radius;/gi), 'Your code should include the <code>-webkit-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.');
   - text: Your code should include the <code>-moz-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.
-    testString: 'assert(code.match(/-moz-border-radius:\s*?\$radius;/gi), "Your code should include the <code>-moz-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.");'
+    testString: assert(code.match(/-moz-border-radius:\s*?\$radius;/gi), 'Your code should include the <code>-moz-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.');
   - text: Your code should include the <code>-ms-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.
-    testString: 'assert(code.match(/-ms-border-radius:\s*?\$radius;/gi), "Your code should include the <code>-ms-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.");'
+    testString: assert(code.match(/-ms-border-radius:\s*?\$radius;/gi), 'Your code should include the <code>-ms-border-radius</code> vender prefix that uses the <code>$radius</code> parameter.');
   - text: Your code should include the general <code>border-radius</code> rule that uses the <code>$radius</code> parameter.
-    testString: 'assert(code.match(/border-radius:\s*?\$radius;/gi).length == 4, "Your code should include the general <code>border-radius</code> rule that uses the <code>$radius</code> parameter.");'
-  - text: 'Your code should call the <code>border-radius mixin</code> using the <code>@include</code> keyword, setting it to 15px.'
-    testString: 'assert(code.match(/@include\s+?border-radius\(\s*?15px\s*?\);/gi), "Your code should call the <code>border-radius mixin</code> using the <code>@include</code> keyword, setting it to 15px.");'
+    testString: assert(code.match(/border-radius:\s*?\$radius;/gi).length == 4, 'Your code should include the general <code>border-radius</code> rule that uses the <code>$radius</code> parameter.');
+  - text: Your code should call the <code>border-radius mixin</code> using the <code>@include</code> keyword, setting it to 15px.
+    testString: assert(code.match(/@include\s+?border-radius\(\s*?15px\s*?\);/gi), 'Your code should call the <code>border-radius mixin</code> using the <code>@include</code> keyword, setting it to 15px.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/extend-one-set-of-css-styles-to-another-element.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/extend-one-set-of-css-styles-to-another-element.english.md
index 060c11a71f..651f1acad0 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/extend-one-set-of-css-styles-to-another-element.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/extend-one-set-of-css-styles-to-another-element.english.md
@@ -30,9 +30,9 @@ Make a class <code>.info-important</code> that extends <code>.info</code> and al
 ```yml
 tests:
   - text: Your <code>info-important</code> class should have a <code>background-color</code> set to <code>magenta</code>.
-    testString: 'assert(code.match(/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi), "Your <code>info-important</code> class should have a <code>background-color</code> set to <code>magenta</code>.");'
+    testString: assert(code.match(/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi), 'Your <code>info-important</code> class should have a <code>background-color</code> set to <code>magenta</code>.');
   - text: Your <code>info-important</code> class should use <code>@extend</code> to inherit the styling from the <code>info</code> class.
-    testString: 'assert(code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi), "Your <code>info-important</code> class should use <code>@extend</code> to inherit the styling from the <code>info</code> class.");'
+    testString: assert(code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi), 'Your <code>info-important</code> class should use <code>@extend</code> to inherit the styling from the <code>info</code> class.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/nest-css-with-sass.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/nest-css-with-sass.english.md
index c9e2cdc52b..f29a3b02fd 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/nest-css-with-sass.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/nest-css-with-sass.english.md
@@ -27,7 +27,7 @@ Use the <code>nesting</code> technique shown above to re-organize the CSS rules
 ```yml
 tests:
   - text: Your code should re-organize the CSS rules so the <code>h1</code> and <code>p</code> are nested in the <code>.blog-post</code> parent element.
-    testString: 'assert(code.match(/\.blog-post\s*?{\s*?h1\s*?{\s*?text-align:\s*?center;\s*?color:\s*?blue;\s*?}\s*?p\s*?{\s*?font-size:\s*?20px;\s*?}\s*?}/gi), "Your code should re-organize the CSS rules so the <code>h1</code> and <code>p</code> are nested in the <code>.blog-post</code> parent element.");'
+    testString: assert(code.match(/\.blog-post\s*?{\s*?h1\s*?{\s*?text-align:\s*?center;\s*?color:\s*?blue;\s*?}\s*?p\s*?{\s*?font-size:\s*?20px;\s*?}\s*?}/gi), 'Your code should re-organize the CSS rules so the <code>h1</code> and <code>p</code> are nested in the <code>.blog-post</code> parent element.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/split-your-styles-into-smaller-chunks-with-partials.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/split-your-styles-into-smaller-chunks-with-partials.english.md
index fddb8a4104..8928e68497 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/split-your-styles-into-smaller-chunks-with-partials.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/split-your-styles-into-smaller-chunks-with-partials.english.md
@@ -26,8 +26,8 @@ Write an <code>@import</code> statement to import a <code>partial</code> named <
 
 ```yml
 tests:
-  - text: 'Your code should use the <code>@import</code> directive, and should not include the underscore in the file name.'
-    testString: 'assert(code.match(/@import\s+?("|")variables\1/gi), "Your code should use the <code>@import</code> directive, and should not include the underscore in the file name.");'
+  - text: Your code should use the <code>@import</code> directive, and should not include the underscore in the file name.
+    testString: assert(code.match(/@import\s+?('|")variables\1/gi), 'Your code should use the <code>@import</code> directive, and should not include the underscore in the file name.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/store-data-with-sass-variables.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/store-data-with-sass-variables.english.md
index 945154be67..8165e972cb 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/store-data-with-sass-variables.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/store-data-with-sass-variables.english.md
@@ -27,13 +27,13 @@ Create a variable <code>$text-color</code> and set it to red. Then change the va
 ```yml
 tests:
   - text: Your code should have a Sass variable declared for <code>$text-color</code> with a value of red.
-    testString: 'assert(code.match(/\$text-color:\s*?red;/g), "Your code should have a Sass variable declared for <code>$text-color</code> with a value of red.");'
+    testString: assert(code.match(/\$text-color:\s*?red;/g), 'Your code should have a Sass variable declared for <code>$text-color</code> with a value of red.');
   - text: Your code should use the <code>$text-color</code> variable to change the <code>color</code> for the <code>.blog-post</code> and <code>h2</code> items.
-    testString: 'assert(code.match(/color:\s*?\$text-color;/g), "Your code should use the <code>$text-color</code> variable to change the <code>color</code> for the <code>.blog-post</code> and <code>h2</code> items.");'
+    testString: assert(code.match(/color:\s*?\$text-color;/g), 'Your code should use the <code>$text-color</code> variable to change the <code>color</code> for the <code>.blog-post</code> and <code>h2</code> items.');
   - text: Your <code>.blog-post</code> element should have a </code>color</code> of red.
-    testString: 'assert($(".blog-post").css("color") == "rgb(255, 0, 0)", "Your <code>.blog-post</code> element should have a </code>color</code> of red.");'
+    testString: assert($('.blog-post').css('color') == 'rgb(255, 0, 0)', 'Your <code>.blog-post</code> element should have a </code>color</code> of red.');
   - text: Your <code>h2</code> elements should have a </code>color</code> of red.
-    testString: 'assert($("h2").css("color") == "rgb(255, 0, 0)", "Your <code>h2</code> elements should have a </code>color</code> of red.");'
+    testString: assert($('h2').css('color') == 'rgb(255, 0, 0)', 'Your <code>h2</code> elements should have a </code>color</code> of red.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/use-each-to-map-over-items-in-a-list.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/use-each-to-map-over-items-in-a-list.english.md
index 32011e3821..452ca02813 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/use-each-to-map-over-items-in-a-list.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/use-each-to-map-over-items-in-a-list.english.md
@@ -31,13 +31,13 @@ Each class should set the <code>background-color</code> the respective color.
 ```yml
 tests:
   - text: Your code should use the <code>@each</code> directive.
-    testString: 'assert(code.match(/@each /g), "Your code should use the <code>@each</code> directive.");'
+    testString: assert(code.match(/@each /g), 'Your code should use the <code>@each</code> directive.');
   - text: Your <code>.blue-bg</code> class should have a <code>background-color</code> of blue.
-    testString: 'assert($(".blue-bg").css("background-color") == "rgb(0, 0, 255)", "Your <code>.blue-bg</code> class should have a <code>background-color</code> of blue.");'
+    testString: assert($('.blue-bg').css('background-color') == 'rgb(0, 0, 255)', 'Your <code>.blue-bg</code> class should have a <code>background-color</code> of blue.');
   - text: Your <code>.black-bg</code> class should have a <code>background-color</code> of black.
-    testString: 'assert($(".black-bg").css("background-color") == "rgb(0, 0, 0)", "Your <code>.black-bg</code> class should have a <code>background-color</code> of black.");'
+    testString: assert($('.black-bg').css('background-color') == 'rgb(0, 0, 0)', 'Your <code>.black-bg</code> class should have a <code>background-color</code> of black.');
   - text: Your <code>.red-bg</code> class should have a <code>background-color</code> of red.
-    testString: 'assert($(".red-bg").css("background-color") == "rgb(255, 0, 0)", "Your <code>.red-bg</code> class should have a <code>background-color</code> of red.");'
+    testString: assert($('.red-bg').css('background-color') == 'rgb(255, 0, 0)', 'Your <code>.red-bg</code> class should have a <code>background-color</code> of red.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/use-for-to-create-a-sass-loop.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/use-for-to-create-a-sass-loop.english.md
index ce6ec9ba9e..7bf2d00c26 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/use-for-to-create-a-sass-loop.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/use-for-to-create-a-sass-loop.english.md
@@ -30,17 +30,17 @@ It should create 5 classes called <code>.text-1</code> to <code>.text-5</code> w
 ```yml
 tests:
   - text: Your code should use the <code>@for</code> directive.
-    testString: 'assert(code.match(/@for /g), "Your code should use the <code>@for</code> directive.");'
+    testString: assert(code.match(/@for /g), 'Your code should use the <code>@for</code> directive.');
   - text: Your <code>.text-1</code> class should have a <code>font-size</code> of 10px.
-    testString: 'assert($(".text-1").css("font-size") == "10px", "Your <code>.text-1</code> class should have a <code>font-size</code> of 10px.");'
+    testString: assert($('.text-1').css('font-size') == '10px', 'Your <code>.text-1</code> class should have a <code>font-size</code> of 10px.');
   - text: Your <code>.text-2</code> class should have a <code>font-size</code> of 20px.
-    testString: 'assert($(".text-2").css("font-size") == "20px", "Your <code>.text-2</code> class should have a <code>font-size</code> of 20px.");'
+    testString: assert($('.text-2').css('font-size') == '20px', 'Your <code>.text-2</code> class should have a <code>font-size</code> of 20px.');
   - text: Your <code>.text-3</code> class should have a <code>font-size</code> of 30px.
-    testString: 'assert($(".text-3").css("font-size") == "30px", "Your <code>.text-3</code> class should have a <code>font-size</code> of 30px.");'
+    testString: assert($('.text-3').css('font-size') == '30px', 'Your <code>.text-3</code> class should have a <code>font-size</code> of 30px.');
   - text: Your <code>.text-4</code> class should have a <code>font-size</code> of 40px.
-    testString: 'assert($(".text-4").css("font-size") == "40px", "Your <code>.text-4</code> class should have a <code>font-size</code> of 40px.");'
+    testString: assert($('.text-4').css('font-size') == '40px', 'Your <code>.text-4</code> class should have a <code>font-size</code> of 40px.');
   - text: Your <code>.text-5</code> class should have a <code>font-size</code> of 50px.
-    testString: 'assert($(".text-5").css("font-size") == "50px", "Your <code>.text-5</code> class should have a <code>font-size</code> of 50px.");'
+    testString: assert($('.text-5').css('font-size') == '50px', 'Your <code>.text-5</code> class should have a <code>font-size</code> of 50px.');
 
 ```
 
diff --git a/curriculum/challenges/english/03-front-end-libraries/sass/use-if-and-else-to-add-logic-to-your-styles.english.md b/curriculum/challenges/english/03-front-end-libraries/sass/use-if-and-else-to-add-logic-to-your-styles.english.md
index 4235438744..3167c27f9b 100644
--- a/curriculum/challenges/english/03-front-end-libraries/sass/use-if-and-else-to-add-logic-to-your-styles.english.md
+++ b/curriculum/challenges/english/03-front-end-libraries/sass/use-if-and-else-to-add-logic-to-your-styles.english.md
@@ -27,15 +27,15 @@ Create a <code>mixin</code> called <code>border-stroke</code> that takes a param
 ```yml
 tests:
   - text: Your code should declare a <code>mixin</code> named <code>border-stroke</code> which has a parameter named <code>$val</code>.
-    testString: 'assert(code.match(/@mixin\s+?border-stroke\s*?\(\s*?\$val\s*?\)\s*?{/gi), "Your code should declare a <code>mixin</code> named <code>border-stroke</code> which has a parameter named <code>$val</code>.");'
-  - text: 'Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.'
-    testString: 'assert(code.match(/@if\s+?\$val\s*?===?\s*?light\s*?{\s*?border\s*?:\s*?1px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.");'
-  - text: 'Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.'
-    testString: 'assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?medium\s*?{\s*?border\s*?:\s*?3px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.");'
-  - text: 'Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.'
-    testString: 'assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?heavy\s*?{\s*?border\s*?:\s*?6px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.");'
+    testString: assert(code.match(/@mixin\s+?border-stroke\s*?\(\s*?\$val\s*?\)\s*?{/gi), 'Your code should declare a <code>mixin</code> named <code>border-stroke</code> which has a parameter named <code>$val</code>.');
+  - text: Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.
+    testString: assert(code.match(/@if\s+?\$val\s*?===?\s*?light\s*?{\s*?border\s*?:\s*?1px\s+?solid\s+?black\s*?;\s*?}/gi), 'Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.');
+  - text: Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.
+    testString: assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?medium\s*?{\s*?border\s*?:\s*?3px\s+?solid\s+?black\s*?;\s*?}/gi), 'Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.');
+  - text: Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.
+    testString: assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?heavy\s*?{\s*?border\s*?:\s*?6px\s+?solid\s+?black\s*?;\s*?}/gi), 'Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.');
   - text: Your <code>mixin</code> should have an <code>@else</code> statement to set the <code>border</code> to none.
-    testString: 'assert(code.match(/@else\s*?{\s*?border\s*?:\s*?none\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else</code> statement to set the <code>border</code> to none.");'
+    testString: assert(code.match(/@else\s*?{\s*?border\s*?:\s*?none\s*?;\s*?}/gi), 'Your <code>mixin</code> should have an <code>@else</code> statement to set the <code>border</code> to none.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element.english.md
index 0a79c84d92..a6fb72aaa2 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element.english.md
@@ -23,7 +23,7 @@ Use the <code>attr()</code> method to add a class of <code>bar</code> to all the
 ```yml
 tests:
   - text: Your <code>rect</code> elements should have a class of <code>bar</code>.
-    testString: 'assert($("rect").attr("class") == "bar", "Your <code>rect</code> elements should have a class of <code>bar</code>.");'
+    testString: assert($('rect').attr('class') == "bar", 'Your <code>rect</code> elements should have a class of <code>bar</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-tooltip-to-a-d3-element.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-tooltip-to-a-d3-element.english.md
index 82b8074b06..93d06839a0 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-tooltip-to-a-d3-element.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-a-tooltip-to-a-d3-element.english.md
@@ -23,25 +23,25 @@ Append a <code>title</code> element under each <code>rect</code> node. Then call
 ```yml
 tests:
   - text: Your code should have 9 <code>title</code> elements.
-    testString: 'assert($("title").length == 9, "Your code should have 9 <code>title</code> elements.");'
+    testString: assert($('title').length == 9, 'Your code should have 9 <code>title</code> elements.');
   - text: The first <code>title</code> element should have tooltip text of 12.
-    testString: 'assert($("title").eq(0).text() == "12", "The first <code>title</code> element should have tooltip text of 12.");'
+    testString: assert($('title').eq(0).text() == '12', 'The first <code>title</code> element should have tooltip text of 12.');
   - text: The second <code>title</code> element should have tooltip text of 31.
-    testString: 'assert($("title").eq(1).text() == "31", "The second <code>title</code> element should have tooltip text of 31.");'
+    testString: assert($('title').eq(1).text() == '31', 'The second <code>title</code> element should have tooltip text of 31.');
   - text: The third <code>title</code> element should have tooltip text of 22.
-    testString: 'assert($("title").eq(2).text() == "22", "The third <code>title</code> element should have tooltip text of 22.");'
+    testString: assert($('title').eq(2).text() == '22', 'The third <code>title</code> element should have tooltip text of 22.');
   - text: The fourth <code>title</code> element should have tooltip text of 17.
-    testString: 'assert($("title").eq(3).text() == "17", "The fourth <code>title</code> element should have tooltip text of 17.");'
+    testString: assert($('title').eq(3).text() == '17', 'The fourth <code>title</code> element should have tooltip text of 17.');
   - text: The fifth <code>title</code> element should have tooltip text of 25.
-    testString: 'assert($("title").eq(4).text() == "25", "The fifth <code>title</code> element should have tooltip text of 25.");'
+    testString: assert($('title').eq(4).text() == '25', 'The fifth <code>title</code> element should have tooltip text of 25.');
   - text: The sixth <code>title</code> element should have tooltip text of 18.
-    testString: 'assert($("title").eq(5).text() == "18", "The sixth <code>title</code> element should have tooltip text of 18.");'
+    testString: assert($('title').eq(5).text() == '18', 'The sixth <code>title</code> element should have tooltip text of 18.');
   - text: The seventh <code>title</code> element should have tooltip text of 29.
-    testString: 'assert($("title").eq(6).text() == "29", "The seventh <code>title</code> element should have tooltip text of 29.");'
+    testString: assert($('title').eq(6).text() == '29', 'The seventh <code>title</code> element should have tooltip text of 29.');
   - text: The eighth <code>title</code> element should have tooltip text of 14.
-    testString: 'assert($("title").eq(7).text() == "14", "The eighth <code>title</code> element should have tooltip text of 14.");'
+    testString: assert($('title').eq(7).text() == '14', 'The eighth <code>title</code> element should have tooltip text of 14.');
   - text: The ninth <code>title</code> element should have tooltip text of 9.
-    testString: 'assert($("title").eq(8).text() == "9", "The ninth <code>title</code> element should have tooltip text of 9.");'
+    testString: assert($('title').eq(8).text() == '9', 'The ninth <code>title</code> element should have tooltip text of 9.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.english.md
index 3df43801af..ddadc3007c 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-attributes-to-the-circle-elements.english.md
@@ -25,27 +25,27 @@ Add <code>cx</code>, <code>cy</code>, and <code>r</code> attributes to the <code
 ```yml
 tests:
   - text: Your code should have 10 <code>circle</code> elements.
-    testString: 'assert($("circle").length == 10, "Your code should have 10 <code>circle</code> elements.");'
-  - text: 'The first <code>circle</code> element should have a <code>cx</code> value of 34, a <code>cy</code> value of 422, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(0).attr("cx") == "34" && $("circle").eq(0).attr("cy") == "422" && $("circle").eq(0).attr("r") == "5", "The first <code>circle</code> element should have a <code>cx</code> value of 34, a <code>cy</code> value of 422, and an <code>r</code> value of 5.");'
-  - text: 'The second <code>circle</code> element should have a <code>cx</code> value of 109, a <code>cy</code> value of 220, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(1).attr("cx") == "109" && $("circle").eq(1).attr("cy") == "220" && $("circle").eq(1).attr("r") == "5", "The second <code>circle</code> element should have a <code>cx</code> value of 109, a <code>cy</code> value of 220, and an <code>r</code> value of 5.");'
-  - text: 'The third <code>circle</code> element should have a <code>cx</code> value of 310, a <code>cy</code> value of 380, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(2).attr("cx") == "310" && $("circle").eq(2).attr("cy") == "380" && $("circle").eq(2).attr("r") == "5", "The third <code>circle</code> element should have a <code>cx</code> value of 310, a <code>cy</code> value of 380, and an <code>r</code> value of 5.");'
-  - text: 'The fourth <code>circle</code> element should have a <code>cx</code> value of 79, a <code>cy</code> value of 89, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(3).attr("cx") == "79" && $("circle").eq(3).attr("cy") == "89" && $("circle").eq(3).attr("r") == "5", "The fourth <code>circle</code> element should have a <code>cx</code> value of 79, a <code>cy</code> value of 89, and an <code>r</code> value of 5.");'
-  - text: 'The fifth <code>circle</code> element should have a <code>cx</code> value of 420, a <code>cy</code> value of 280, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(4).attr("cx") == "420" && $("circle").eq(4).attr("cy") == "280" && $("circle").eq(4).attr("r") == "5", "The fifth <code>circle</code> element should have a <code>cx</code> value of 420, a <code>cy</code> value of 280, and an <code>r</code> value of 5.");'
-  - text: 'The sixth <code>circle</code> element should have a <code>cx</code> value of 233, a <code>cy</code> value of 355, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(5).attr("cx") == "233" && $("circle").eq(5).attr("cy") == "355" && $("circle").eq(5).attr("r") == "5", "The sixth <code>circle</code> element should have a <code>cx</code> value of 233, a <code>cy</code> value of 355, and an <code>r</code> value of 5.");'
-  - text: 'The seventh <code>circle</code> element should have a <code>cx</code> value of 333, a <code>cy</code> value of 404, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(6).attr("cx") == "333" && $("circle").eq(6).attr("cy") == "404" && $("circle").eq(6).attr("r") == "5", "The seventh <code>circle</code> element should have a <code>cx</code> value of 333, a <code>cy</code> value of 404, and an <code>r</code> value of 5.");'
-  - text: 'The eighth <code>circle</code> element should have a <code>cx</code> value of 222, a <code>cy</code> value of 167, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(7).attr("cx") == "222" && $("circle").eq(7).attr("cy") == "167" && $("circle").eq(7).attr("r") == "5", "The eighth <code>circle</code> element should have a <code>cx</code> value of 222, a <code>cy</code> value of 167, and an <code>r</code> value of 5.");'
-  - text: 'The ninth <code>circle</code> element should have a <code>cx</code> value of 78, a <code>cy</code> value of 180, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(8).attr("cx") == "78" && $("circle").eq(8).attr("cy") == "180" && $("circle").eq(8).attr("r") == "5", "The ninth <code>circle</code> element should have a <code>cx</code> value of 78, a <code>cy</code> value of 180, and an <code>r</code> value of 5.");'
-  - text: 'The tenth <code>circle</code> element should have a <code>cx</code> value of 21, a <code>cy</code> value of 377, and an <code>r</code> value of 5.'
-    testString: 'assert($("circle").eq(9).attr("cx") == "21" && $("circle").eq(9).attr("cy") == "377" && $("circle").eq(9).attr("r") == "5", "The tenth <code>circle</code> element should have a <code>cx</code> value of 21, a <code>cy</code> value of 377, and an <code>r</code> value of 5.");'
+    testString: assert($('circle').length == 10, 'Your code should have 10 <code>circle</code> elements.');
+  - text: The first <code>circle</code> element should have a <code>cx</code> value of 34, a <code>cy</code> value of 422, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(0).attr('cx') == '34' && $('circle').eq(0).attr('cy') == '422' && $('circle').eq(0).attr('r') == '5', 'The first <code>circle</code> element should have a <code>cx</code> value of 34, a <code>cy</code> value of 422, and an <code>r</code> value of 5.');
+  - text: The second <code>circle</code> element should have a <code>cx</code> value of 109, a <code>cy</code> value of 220, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(1).attr('cx') == '109' && $('circle').eq(1).attr('cy') == '220' && $('circle').eq(1).attr('r') == '5', 'The second <code>circle</code> element should have a <code>cx</code> value of 109, a <code>cy</code> value of 220, and an <code>r</code> value of 5.');
+  - text: The third <code>circle</code> element should have a <code>cx</code> value of 310, a <code>cy</code> value of 380, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(2).attr('cx') == '310' && $('circle').eq(2).attr('cy') == '380' && $('circle').eq(2).attr('r') == '5', 'The third <code>circle</code> element should have a <code>cx</code> value of 310, a <code>cy</code> value of 380, and an <code>r</code> value of 5.');
+  - text: The fourth <code>circle</code> element should have a <code>cx</code> value of 79, a <code>cy</code> value of 89, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(3).attr('cx') == '79' && $('circle').eq(3).attr('cy') == '89' && $('circle').eq(3).attr('r') == '5', 'The fourth <code>circle</code> element should have a <code>cx</code> value of 79, a <code>cy</code> value of 89, and an <code>r</code> value of 5.');
+  - text: The fifth <code>circle</code> element should have a <code>cx</code> value of 420, a <code>cy</code> value of 280, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(4).attr('cx') == '420' && $('circle').eq(4).attr('cy') == '280' && $('circle').eq(4).attr('r') == '5', 'The fifth <code>circle</code> element should have a <code>cx</code> value of 420, a <code>cy</code> value of 280, and an <code>r</code> value of 5.');
+  - text: The sixth <code>circle</code> element should have a <code>cx</code> value of 233, a <code>cy</code> value of 355, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(5).attr('cx') == '233' && $('circle').eq(5).attr('cy') == '355' && $('circle').eq(5).attr('r') == '5', 'The sixth <code>circle</code> element should have a <code>cx</code> value of 233, a <code>cy</code> value of 355, and an <code>r</code> value of 5.');
+  - text: The seventh <code>circle</code> element should have a <code>cx</code> value of 333, a <code>cy</code> value of 404, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(6).attr('cx') == '333' && $('circle').eq(6).attr('cy') == '404' && $('circle').eq(6).attr('r') == '5', 'The seventh <code>circle</code> element should have a <code>cx</code> value of 333, a <code>cy</code> value of 404, and an <code>r</code> value of 5.');
+  - text: The eighth <code>circle</code> element should have a <code>cx</code> value of 222, a <code>cy</code> value of 167, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(7).attr('cx') == '222' && $('circle').eq(7).attr('cy') == '167' && $('circle').eq(7).attr('r') == '5', 'The eighth <code>circle</code> element should have a <code>cx</code> value of 222, a <code>cy</code> value of 167, and an <code>r</code> value of 5.');
+  - text: The ninth <code>circle</code> element should have a <code>cx</code> value of 78, a <code>cy</code> value of 180, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(8).attr('cx') == '78' && $('circle').eq(8).attr('cy') == '180' && $('circle').eq(8).attr('r') == '5', 'The ninth <code>circle</code> element should have a <code>cx</code> value of 78, a <code>cy</code> value of 180, and an <code>r</code> value of 5.');
+  - text: The tenth <code>circle</code> element should have a <code>cx</code> value of 21, a <code>cy</code> value of 377, and an <code>r</code> value of 5.
+    testString: assert($('circle').eq(9).attr('cx') == '21' && $('circle').eq(9).attr('cy') == '377' && $('circle').eq(9).attr('r') == '5', 'The tenth <code>circle</code> element should have a <code>cx</code> value of 21, a <code>cy</code> value of 377, and an <code>r</code> value of 5.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.english.md
index 80a682d88e..42d087d0ab 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-axes-to-a-visualization.english.md
@@ -31,11 +31,11 @@ The scatter plot now has an x-axis. Create a y-axis in a variable named <code>yA
 ```yml
 tests:
   - text: Your code should use the <code>axisLeft()</code> method with <code>yScale</code> passed as the argument.
-    testString: 'assert(code.match(/\.axisLeft\(yScale\)/g), "Your code should use the <code>axisLeft()</code> method with <code>yScale</code> passed as the argument.");'
-  - text: 'The y-axis <code>g</code> element should have a <code>transform</code> attribute to translate the axis by (60, 0).'
-    testString: 'assert($("g").eq(1).attr("transform").match(/translate\(60\s*?,\s*?0\)/g), "The y-axis <code>g</code> element should have a <code>transform</code> attribute to translate the axis by (60, 0).");'
+    testString: assert(code.match(/\.axisLeft\(yScale\)/g), 'Your code should use the <code>axisLeft()</code> method with <code>yScale</code> passed as the argument.');
+  - text: The y-axis <code>g</code> element should have a <code>transform</code> attribute to translate the axis by (60, 0).
+    testString: assert($('g').eq(1).attr('transform').match(/translate\(60\s*?,\s*?0\)/g), 'The y-axis <code>g</code> element should have a <code>transform</code> attribute to translate the axis by (60, 0).');
   - text: Your code should call the <code>yAxis</code>.
-    testString: 'assert(code.match(/\.call\(yAxis\)/g), "Your code should call the <code>yAxis</code>.");'
+    testString: assert(code.match(/\.call\(yAxis\)/g), 'Your code should call the <code>yAxis</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-classes-with-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-classes-with-d3.english.md
index 5913e4f3e8..213d329c95 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-classes-with-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-classes-with-d3.english.md
@@ -26,9 +26,9 @@ Add the <code>attr()</code> method to the code in the editor and put a class of
 ```yml
 tests:
   - text: Your <code>div</code> elements should have a class of <code>bar</code>.
-    testString: 'assert($("div").attr("class") == "bar", "Your <code>div</code> elements should have a class of <code>bar</code>.");'
+    testString: assert($('div').attr('class') == "bar", 'Your <code>div</code> elements should have a class of <code>bar</code>.');
   - text: Your code should use the <code>attr()</code> method.
-    testString: 'assert(code.match(/\.attr/g), "Your code should use the <code>attr()</code> method.");'
+    testString: assert(code.match(/\.attr/g), 'Your code should use the <code>attr()</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-document-elements-with-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-document-elements-with-d3.english.md
index 3c8ecce1a9..20dff1092f 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-document-elements-with-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-document-elements-with-d3.english.md
@@ -31,17 +31,17 @@ Use the <code>select</code> method to select the <code>body</code> tag in the do
 ```yml
 tests:
   - text: The <code>body</code> should have one <code>h1</code> element.
-    testString: 'assert($("body").children("h1").length == 1, "The <code>body</code> should have one <code>h1</code> element.");'
+    testString: assert($('body').children('h1').length == 1, 'The <code>body</code> should have one <code>h1</code> element.');
   - text: The <code>h1</code> element should have the text "Learning D3" in it.
-    testString: 'assert($("h1").text() == "Learning D3", "The <code>h1</code> element should have the text "Learning D3" in it.");'
+    testString: assert($('h1').text() == "Learning D3", 'The <code>h1</code> element should have the text "Learning D3" in it.');
   - text: Your code should access the <code>d3</code> object.
-    testString: 'assert(code.match(/d3/g), "Your code should access the <code>d3</code> object.");'
+    testString: assert(code.match(/d3/g), 'Your code should access the <code>d3</code> object.');
   - text: Your code should use the <code>select</code> method.
-    testString: 'assert(code.match(/\.select/g), "Your code should use the <code>select</code> method.");'
+    testString: assert(code.match(/\.select/g), 'Your code should use the <code>select</code> method.');
   - text: Your code should use the <code>append</code> method.
-    testString: 'assert(code.match(/\.append/g), "Your code should use the <code>append</code> method.");'
+    testString: assert(code.match(/\.append/g), 'Your code should use the <code>append</code> method.');
   - text: Your code should use the <code>text</code> method.
-    testString: 'assert(code.match(/\.text/g), "Your code should use the <code>text</code> method.");'
+    testString: assert(code.match(/\.text/g), 'Your code should use the <code>text</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-inline-styling-to-elements.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-inline-styling-to-elements.english.md
index 7e57cb46c9..8333cf989a 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-inline-styling-to-elements.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-inline-styling-to-elements.english.md
@@ -24,9 +24,9 @@ Add the <code>style()</code> method to the code in the editor to make all the di
 ```yml
 tests:
   - text: Your <code>h2</code> elements should have a <code>font-family</code> of verdana.
-    testString: 'assert($("h2").css("font-family") == "verdana", "Your <code>h2</code> elements should have a <code>font-family</code> of verdana.");'
+    testString: assert($('h2').css('font-family') == 'verdana', 'Your <code>h2</code> elements should have a <code>font-family</code> of verdana.');
   - text: Your code should use the <code>style()</code> method.
-    testString: 'assert(code.match(/\.style/g), "Your code should use the <code>style()</code> method.");'
+    testString: assert(code.match(/\.style/g), 'Your code should use the <code>style()</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.english.md
index fd753d28d3..ed0847be78 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-d3-elements.english.md
@@ -25,23 +25,23 @@ The code in the editor already binds the data to each new <code>text</code> elem
 ```yml
 tests:
   - text: The first <code>text</code> element should have a label of 12 and a <code>y</code> value of 61.
-    testString: 'assert($("text").eq(0).text() == "12" && $("text").eq(0).attr("y") == "61", "The first <code>text</code> element should have a label of 12 and a <code>y</code> value of 61.");'
+    testString: assert($('text').eq(0).text() == '12' && $('text').eq(0).attr('y') == '61', 'The first <code>text</code> element should have a label of 12 and a <code>y</code> value of 61.');
   - text: The second <code>text</code> element should have a label of 31 and a <code>y</code> value of 4.
-    testString: 'assert($("text").eq(1).text() == "31" && $("text").eq(1).attr("y") == "4", "The second <code>text</code> element should have a label of 31 and a <code>y</code> value of 4.");'
+    testString: assert($('text').eq(1).text() == '31' && $('text').eq(1).attr('y') == '4', 'The second <code>text</code> element should have a label of 31 and a <code>y</code> value of 4.');
   - text: The third <code>text</code> element should have a label of 22 and a <code>y</code> value of 31.
-    testString: 'assert($("text").eq(2).text() == "22" && $("text").eq(2).attr("y") == "31", "The third <code>text</code> element should have a label of 22 and a <code>y</code> value of 31.");'
+    testString: assert($('text').eq(2).text() == '22' && $('text').eq(2).attr('y') == '31', 'The third <code>text</code> element should have a label of 22 and a <code>y</code> value of 31.');
   - text: The fourth <code>text</code> element should have a label of 17 and a <code>y</code> value of 46.
-    testString: 'assert($("text").eq(3).text() == "17" && $("text").eq(3).attr("y") == "46", "The fourth <code>text</code> element should have a label of 17 and a <code>y</code> value of 46.");'
+    testString: assert($('text').eq(3).text() == '17' && $('text').eq(3).attr('y') == '46', 'The fourth <code>text</code> element should have a label of 17 and a <code>y</code> value of 46.');
   - text: The fifth <code>text</code> element should have a label of 25 and a <code>y</code> value of 22.
-    testString: 'assert($("text").eq(4).text() == "25" && $("text").eq(4).attr("y") == "22", "The fifth <code>text</code> element should have a label of 25 and a <code>y</code> value of 22.");'
+    testString: assert($('text').eq(4).text() == '25' && $('text').eq(4).attr('y') == '22', 'The fifth <code>text</code> element should have a label of 25 and a <code>y</code> value of 22.');
   - text: The sixth <code>text</code> element should have a label of 18 and a <code>y</code> value of 43.
-    testString: 'assert($("text").eq(5).text() == "18" && $("text").eq(5).attr("y") == "43", "The sixth <code>text</code> element should have a label of 18 and a <code>y</code> value of 43.");'
+    testString: assert($('text').eq(5).text() == '18' && $('text').eq(5).attr('y') == '43', 'The sixth <code>text</code> element should have a label of 18 and a <code>y</code> value of 43.');
   - text: The seventh <code>text</code> element should have a label of 29 and a <code>y</code> value of 10.
-    testString: 'assert($("text").eq(6).text() == "29" && $("text").eq(6).attr("y") == "10", "The seventh <code>text</code> element should have a label of 29 and a <code>y</code> value of 10.");'
+    testString: assert($('text').eq(6).text() == '29' && $('text').eq(6).attr('y') == '10', 'The seventh <code>text</code> element should have a label of 29 and a <code>y</code> value of 10.');
   - text: The eighth <code>text</code> element should have a label of 14 and a <code>y</code> value of 55.
-    testString: 'assert($("text").eq(7).text() == "14" && $("text").eq(7).attr("y") == "55", "The eighth <code>text</code> element should have a label of 14 and a <code>y</code> value of 55.");'
+    testString: assert($('text').eq(7).text() == '14' && $('text').eq(7).attr('y') == '55', 'The eighth <code>text</code> element should have a label of 14 and a <code>y</code> value of 55.');
   - text: The ninth <code>text</code> element should have a label of 9 and a <code>y</code> value of 70.
-    testString: 'assert($("text").eq(8).text() == "9" && $("text").eq(8).attr("y") == "70", "The ninth <code>text</code> element should have a label of 9 and a <code>y</code> value of 70.");'
+    testString: assert($('text').eq(8).text() == '9' && $('text').eq(8).attr('y') == '70', 'The ninth <code>text</code> element should have a label of 9 and a <code>y</code> value of 70.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.english.md
index 3aad4c598a..f0a0fdc518 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/add-labels-to-scatter-plot-circles.english.md
@@ -24,27 +24,27 @@ Label each point on the scatter plot using the <code>text</code> elements. The t
 ```yml
 tests:
   - text: Your code should have 10 <code>text</code> elements.
-    testString: 'assert($("text").length == 10, "Your code should have 10 <code>text</code> elements.");'
-  - text: 'The first label should have text of "34, 78", an <code>x</code> value of 39, and a <code>y</code> value of 422.'
-    testString: 'assert($("text").eq(0).text() == "34, 78" && $("text").eq(0).attr("x") == "39" && $("text").eq(0).attr("y") == "422", "The first label should have text of "34, 78", an <code>x</code> value of 39, and a <code>y</code> value of 422.");'
-  - text: 'The second label should have text of "109, 280", an <code>x</code> value of 114, and a <code>y</code> value of 220.'
-    testString: 'assert($("text").eq(1).text() == "109, 280" && $("text").eq(1).attr("x") == "114" && $("text").eq(1).attr("y") == "220", "The second label should have text of "109, 280", an <code>x</code> value of 114, and a <code>y</code> value of 220.");'
-  - text: 'The third label should have text of "310, 120", an <code>x</code> value of 315, and a <code>y</code> value of 380.'
-    testString: 'assert($("text").eq(2).text() == "310, 120" && $("text").eq(2).attr("x") == "315" && $("text").eq(2).attr("y") == "380", "The third label should have text of "310, 120", an <code>x</code> value of 315, and a <code>y</code> value of 380.");'
-  - text: 'The fourth label should have text of "79, 411", an <code>x</code> value of 84, and a <code>y</code> value of 89.'
-    testString: 'assert($("text").eq(3).text() == "79, 411" && $("text").eq(3).attr("x") == "84" && $("text").eq(3).attr("y") == "89", "The fourth label should have text of "79, 411", an <code>x</code> value of 84, and a <code>y</code> value of 89.");'
-  - text: 'The fifth label should have text of "420, 220", an <code>x</code> value of 425, and a <code>y</code> value of 280.'
-    testString: 'assert($("text").eq(4).text() == "420, 220" && $("text").eq(4).attr("x") == "425" && $("text").eq(4).attr("y") == "280", "The fifth label should have text of "420, 220", an <code>x</code> value of 425, and a <code>y</code> value of 280.");'
-  - text: 'The sixth label should have text of "233, 145", an <code>x</code> value of 238, and a <code>y</code> value of 355.'
-    testString: 'assert($("text").eq(5).text() == "233, 145" && $("text").eq(5).attr("x") == "238" && $("text").eq(5).attr("y") == "355", "The sixth label should have text of "233, 145", an <code>x</code> value of 238, and a <code>y</code> value of 355.");'
-  - text: 'The seventh label should have text of "333, 96", an <code>x</code> value of 338, and a <code>y</code> value of 404.'
-    testString: 'assert($("text").eq(6).text() == "333, 96" && $("text").eq(6).attr("x") == "338" && $("text").eq(6).attr("y") == "404", "The seventh label should have text of "333, 96", an <code>x</code> value of 338, and a <code>y</code> value of 404.");'
-  - text: 'The eighth label should have text of "222, 333", an <code>x</code> value of 227, and a <code>y</code> value of 167.'
-    testString: 'assert($("text").eq(7).text() == "222, 333" && $("text").eq(7).attr("x") == "227" && $("text").eq(7).attr("y") == "167", "The eighth label should have text of "222, 333", an <code>x</code> value of 227, and a <code>y</code> value of 167.");'
-  - text: 'The ninth label should have text of "78, 320", an <code>x</code> value of 83, and a <code>y</code> value of 180.'
-    testString: 'assert($("text").eq(8).text() == "78, 320" && $("text").eq(8).attr("x") == "83" && $("text").eq(8).attr("y") == "180", "The ninth label should have text of "78, 320", an <code>x</code> value of 83, and a <code>y</code> value of 180.");'
-  - text: 'The tenth label should have text of "21, 123", an <code>x</code> value of 26, and a <code>y</code> value of 377.'
-    testString: 'assert($("text").eq(9).text() == "21, 123" && $("text").eq(9).attr("x") == "26" && $("text").eq(9).attr("y") == "377", "The tenth label should have text of "21, 123", an <code>x</code> value of 26, and a <code>y</code> value of 377.");'
+    testString: assert($('text').length == 10, 'Your code should have 10 <code>text</code> elements.');
+  - text: The first label should have text of "34, 78", an <code>x</code> value of 39, and a <code>y</code> value of 422.
+    testString: assert($('text').eq(0).text() == '34, 78' && $('text').eq(0).attr('x') == '39' && $('text').eq(0).attr('y') == '422', 'The first label should have text of "34, 78", an <code>x</code> value of 39, and a <code>y</code> value of 422.');
+  - text: The second label should have text of "109, 280", an <code>x</code> value of 114, and a <code>y</code> value of 220.
+    testString: assert($('text').eq(1).text() == '109, 280' && $('text').eq(1).attr('x') == '114' && $('text').eq(1).attr('y') == '220', 'The second label should have text of "109, 280", an <code>x</code> value of 114, and a <code>y</code> value of 220.');
+  - text: The third label should have text of "310, 120", an <code>x</code> value of 315, and a <code>y</code> value of 380.
+    testString: assert($('text').eq(2).text() == '310, 120' && $('text').eq(2).attr('x') == '315' && $('text').eq(2).attr('y') == '380', 'The third label should have text of "310, 120", an <code>x</code> value of 315, and a <code>y</code> value of 380.');
+  - text: The fourth label should have text of "79, 411", an <code>x</code> value of 84, and a <code>y</code> value of 89.
+    testString: assert($('text').eq(3).text() == '79, 411' && $('text').eq(3).attr('x') == '84' && $('text').eq(3).attr('y') == '89', 'The fourth label should have text of "79, 411", an <code>x</code> value of 84, and a <code>y</code> value of 89.');
+  - text: The fifth label should have text of "420, 220", an <code>x</code> value of 425, and a <code>y</code> value of 280.
+    testString: assert($('text').eq(4).text() == '420, 220' && $('text').eq(4).attr('x') == '425' && $('text').eq(4).attr('y') == '280', 'The fifth label should have text of "420, 220", an <code>x</code> value of 425, and a <code>y</code> value of 280.');
+  - text: The sixth label should have text of "233, 145", an <code>x</code> value of 238, and a <code>y</code> value of 355.
+    testString: assert($('text').eq(5).text() == '233, 145' && $('text').eq(5).attr('x') == '238' && $('text').eq(5).attr('y') == '355', 'The sixth label should have text of "233, 145", an <code>x</code> value of 238, and a <code>y</code> value of 355.');
+  - text: The seventh label should have text of "333, 96", an <code>x</code> value of 338, and a <code>y</code> value of 404.
+    testString: assert($('text').eq(6).text() == '333, 96' && $('text').eq(6).attr('x') == '338' && $('text').eq(6).attr('y') == '404', 'The seventh label should have text of "333, 96", an <code>x</code> value of 338, and a <code>y</code> value of 404.');
+  - text: The eighth label should have text of "222, 333", an <code>x</code> value of 227, and a <code>y</code> value of 167.
+    testString: assert($('text').eq(7).text() == '222, 333' && $('text').eq(7).attr('x') == '227' && $('text').eq(7).attr('y') == '167', 'The eighth label should have text of "222, 333", an <code>x</code> value of 227, and a <code>y</code> value of 167.');
+  - text: The ninth label should have text of "78, 320", an <code>x</code> value of 83, and a <code>y</code> value of 180.
+    testString: assert($('text').eq(8).text() == '78, 320' && $('text').eq(8).attr('x') == '83' && $('text').eq(8).attr('y') == '180', 'The ninth label should have text of "78, 320", an <code>x</code> value of 83, and a <code>y</code> value of 180.');
+  - text: The tenth label should have text of "21, 123", an <code>x</code> value of 26, and a <code>y</code> value of 377.
+    testString: assert($('text').eq(9).text() == '21, 123' && $('text').eq(9).attr('x') == '26' && $('text').eq(9).attr('y') == '377', 'The tenth label should have text of "21, 123", an <code>x</code> value of 26, and a <code>y</code> value of 377.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-styles-based-on-data.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-styles-based-on-data.english.md
index e752d3cfdc..1ca6f9d4ff 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-styles-based-on-data.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-styles-based-on-data.english.md
@@ -26,23 +26,23 @@ Add the <code>style()</code> method to the code in the editor to set the <code>c
 ```yml
 tests:
   - text: The first <code>h2</code> should have a <code>color</code> of red.
-    testString: 'assert($("h2").eq(0).css("color") == "rgb(255, 0, 0)", "The first <code>h2</code> should have a <code>color</code> of red.");'
+    testString: assert($('h2').eq(0).css('color') == "rgb(255, 0, 0)", 'The first <code>h2</code> should have a <code>color</code> of red.');
   - text: The second <code>h2</code> should have a <code>color</code> of green.
-    testString: 'assert($("h2").eq(1).css("color") == "rgb(0, 128, 0)", "The second <code>h2</code> should have a <code>color</code> of green.");'
+    testString: assert($('h2').eq(1).css('color') == "rgb(0, 128, 0)", 'The second <code>h2</code> should have a <code>color</code> of green.');
   - text: The third <code>h2</code> should have a <code>color</code> of green.
-    testString: 'assert($("h2").eq(2).css("color") == "rgb(0, 128, 0)", "The third <code>h2</code> should have a <code>color</code> of green.");'
+    testString: assert($('h2').eq(2).css('color') == "rgb(0, 128, 0)", 'The third <code>h2</code> should have a <code>color</code> of green.');
   - text: The fourth <code>h2</code> should have a <code>color</code> of red.
-    testString: 'assert($("h2").eq(3).css("color") == "rgb(255, 0, 0)", "The fourth <code>h2</code> should have a <code>color</code> of red.");'
+    testString: assert($('h2').eq(3).css('color') == "rgb(255, 0, 0)", 'The fourth <code>h2</code> should have a <code>color</code> of red.');
   - text: The fifth <code>h2</code> should have a <code>color</code> of green.
-    testString: 'assert($("h2").eq(4).css("color") == "rgb(0, 128, 0)", "The fifth <code>h2</code> should have a <code>color</code> of green.");'
+    testString: assert($('h2').eq(4).css('color') == "rgb(0, 128, 0)", 'The fifth <code>h2</code> should have a <code>color</code> of green.');
   - text: The sixth <code>h2</code> should have a <code>color</code> of red.
-    testString: 'assert($("h2").eq(5).css("color") == "rgb(255, 0, 0)", "The sixth <code>h2</code> should have a <code>color</code> of red.");'
+    testString: assert($('h2').eq(5).css('color') == "rgb(255, 0, 0)", 'The sixth <code>h2</code> should have a <code>color</code> of red.');
   - text: The seventh <code>h2</code> should have a <code>color</code> of green.
-    testString: 'assert($("h2").eq(6).css("color") == "rgb(0, 128, 0)", "The seventh <code>h2</code> should have a <code>color</code> of green.");'
+    testString: assert($('h2').eq(6).css('color') == "rgb(0, 128, 0)", 'The seventh <code>h2</code> should have a <code>color</code> of green.');
   - text: The eighth <code>h2</code> should have a <code>color</code> of red.
-    testString: 'assert($("h2").eq(7).css("color") == "rgb(255, 0, 0)", "The eighth <code>h2</code> should have a <code>color</code> of red.");'
+    testString: assert($('h2').eq(7).css('color') == "rgb(255, 0, 0)", 'The eighth <code>h2</code> should have a <code>color</code> of red.');
   - text: The ninth <code>h2</code> should have a <code>color</code> of red.
-    testString: 'assert($("h2").eq(8).css("color") == "rgb(255, 0, 0)", "The ninth <code>h2</code> should have a <code>color</code> of red.");'
+    testString: assert($('h2').eq(8).css('color') == "rgb(255, 0, 0)", 'The ninth <code>h2</code> should have a <code>color</code> of red.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-color-of-an-svg-element.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-color-of-an-svg-element.english.md
index 6452fd7e14..77d8f48a59 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-color-of-an-svg-element.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-color-of-an-svg-element.english.md
@@ -23,7 +23,7 @@ Add an <code>attr()</code> method to set the "fill" of all the bars to the color
 ```yml
 tests:
   - text: The bars should all have a <code>fill</code> color of navy.
-    testString: 'assert($("rect").css("fill") == "rgb(0, 0, 128)", "The bars should all have a <code>fill</code> color of navy.");'
+    testString: assert($('rect').css('fill') == "rgb(0, 0, 128)", 'The bars should all have a <code>fill</code> color of navy.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-presentation-of-a-bar-chart.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-presentation-of-a-bar-chart.english.md
index a8e3ae058e..4edc4f1135 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-presentation-of-a-bar-chart.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/change-the-presentation-of-a-bar-chart.english.md
@@ -25,23 +25,23 @@ First, add a <code>margin</code> of 2px to the <code>bar</code> class in the <co
 ```yml
 tests:
   - text: The first <code>div</code> should have a <code>height</code> of 120 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(0).css("height") == "120px" && $("div").eq(0).css("margin-right") == "2px", "The first <code>div</code> should have a <code>height</code> of 120 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(0).css('height') == '120px' && $('div').eq(0).css('margin-right') == '2px', 'The first <code>div</code> should have a <code>height</code> of 120 pixels and a <code>margin</code> of 2 pixels.');
   - text: The second <code>div</code> should have a <code>height</code> of 310 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(1).css("height") == "310px" && $("div").eq(1).css("margin-right") == "2px", "The second <code>div</code> should have a <code>height</code> of 310 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(1).css('height') == '310px' && $('div').eq(1).css('margin-right') == '2px', 'The second <code>div</code> should have a <code>height</code> of 310 pixels and a <code>margin</code> of 2 pixels.');
   - text: The third <code>div</code> should have a <code>height</code> of 220 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(2).css("height") == "220px" && $("div").eq(2).css("margin-right") == "2px", "The third <code>div</code> should have a <code>height</code> of 220 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(2).css('height') == '220px' && $('div').eq(2).css('margin-right') == '2px', 'The third <code>div</code> should have a <code>height</code> of 220 pixels and a <code>margin</code> of 2 pixels.');
   - text: The fourth <code>div</code> should have a <code>height</code> of 170 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(3).css("height") == "170px" && $("div").eq(3).css("margin-right") == "2px", "The fourth <code>div</code> should have a <code>height</code> of 170 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(3).css('height') == '170px' && $('div').eq(3).css('margin-right') == '2px', 'The fourth <code>div</code> should have a <code>height</code> of 170 pixels and a <code>margin</code> of 2 pixels.');
   - text: The fifth <code>div</code> should have a <code>height</code> of 250 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(4).css("height") == "250px" && $("div").eq(4).css("margin-right") == "2px", "The fifth <code>div</code> should have a <code>height</code> of 250 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(4).css('height') == '250px' && $('div').eq(4).css('margin-right') == '2px', 'The fifth <code>div</code> should have a <code>height</code> of 250 pixels and a <code>margin</code> of 2 pixels.');
   - text: The sixth <code>div</code> should have a <code>height</code> of 180 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(5).css("height") == "180px" && $("div").eq(5).css("margin-right") == "2px", "The sixth <code>div</code> should have a <code>height</code> of 180 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(5).css('height') == '180px' && $('div').eq(5).css('margin-right') == '2px', 'The sixth <code>div</code> should have a <code>height</code> of 180 pixels and a <code>margin</code> of 2 pixels.');
   - text: The seventh <code>div</code> should have a <code>height</code> of 290 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(6).css("height") == "290px" && $("div").eq(6).css("margin-right") == "2px", "The seventh <code>div</code> should have a <code>height</code> of 290 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(6).css('height') == '290px' && $('div').eq(6).css('margin-right') == '2px', 'The seventh <code>div</code> should have a <code>height</code> of 290 pixels and a <code>margin</code> of 2 pixels.');
   - text: The eighth <code>div</code> should have a <code>height</code> of 140 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(7).css("height") == "140px" && $("div").eq(7).css("margin-right") == "2px", "The eighth <code>div</code> should have a <code>height</code> of 140 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(7).css('height') == '140px' && $('div').eq(7).css('margin-right') == '2px', 'The eighth <code>div</code> should have a <code>height</code> of 140 pixels and a <code>margin</code> of 2 pixels.');
   - text: The ninth <code>div</code> should have a <code>height</code> of 90 pixels and a <code>margin</code> of 2 pixels.
-    testString: 'assert($("div").eq(8).css("height") == "90px" && $("div").eq(8).css("margin-right") == "2px", "The ninth <code>div</code> should have a <code>height</code> of 90 pixels and a <code>margin</code> of 2 pixels.");'
+    testString: assert($('div').eq(8).css('height') == '90px' && $('div').eq(8).css('margin-right') == '2px', 'The ninth <code>div</code> should have a <code>height</code> of 90 pixels and a <code>margin</code> of 2 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-bar-for-each-data-point-in-the-set.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-bar-for-each-data-point-in-the-set.english.md
index 744c4d799b..26f6cb586c 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-bar-for-each-data-point-in-the-set.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-bar-for-each-data-point-in-the-set.english.md
@@ -25,13 +25,13 @@ Use the <code>data()</code>, <code>enter()</code>, and <code>append()</code> met
 ```yml
 tests:
   - text: Your document should have 9 <code>rect</code> elements.
-    testString: 'assert($("rect").length == 9, "Your document should have 9 <code>rect</code> elements.");'
+    testString: assert($('rect').length == 9, 'Your document should have 9 <code>rect</code> elements.');
   - text: Your code should use the <code>data()</code> method.
-    testString: 'assert(code.match(/\.data/g), "Your code should use the <code>data()</code> method.");'
+    testString: assert(code.match(/\.data/g), 'Your code should use the <code>data()</code> method.');
   - text: Your code should use the <code>enter()</code> method.
-    testString: 'assert(code.match(/\.enter/g), "Your code should use the <code>enter()</code> method.");'
+    testString: assert(code.match(/\.enter/g), 'Your code should use the <code>enter()</code> method.');
   - text: Your code should use the <code>append()</code> method.
-    testString: 'assert(code.match(/\.append/g), "Your code should use the <code>append()</code> method.");'
+    testString: assert(code.match(/\.append/g), 'Your code should use the <code>append()</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.english.md
index 6302ff5d31..432a538273 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3.english.md
@@ -28,11 +28,11 @@ Change the <code>scale</code> variable to create a linear scale. Then set the <c
 ```yml
 tests:
   - text: The text in the <code>h2</code> should be 50.
-    testString: 'assert($("h2").text() == "50", "The text in the <code>h2</code> should be 50.");'
+    testString: assert($('h2').text() == '50', 'The text in the <code>h2</code> should be 50.');
   - text: Your code should use the <code>scaleLinear()</code> method.
-    testString: 'assert(code.match(/\.scaleLinear/g), "Your code should use the <code>scaleLinear()</code> method.");'
+    testString: assert(code.match(/\.scaleLinear/g), 'Your code should use the <code>scaleLinear()</code> method.');
   - text: The <code>output</code> variable should call <code>scale</code> with an argument of 50.
-    testString: 'assert(output == 50 && code.match(/scale\(\s*?50\s*?\)/g), "The <code>output</code> variable should call <code>scale</code> with an argument of 50.");'
+    testString: assert(output == 50 && code.match(/scale\(\s*?50\s*?\)/g), 'The <code>output</code> variable should call <code>scale</code> with an argument of 50.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.english.md
index 3106f88477..193af7f4a1 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/create-a-scatterplot-with-svg-circles.english.md
@@ -24,7 +24,7 @@ Use the <code>data()</code>, <code>enter()</code>, and <code>append()</code> met
 ```yml
 tests:
   - text: Your code should have 10 <code>circle</code> elements.
-    testString: 'assert($("circle").length == 10, "Your code should have 10 <code>circle</code> elements.");'
+    testString: assert($('circle').length == 10, 'Your code should have 10 <code>circle</code> elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/display-shapes-with-svg.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/display-shapes-with-svg.english.md
index 2b01925a03..98f442a9e8 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/display-shapes-with-svg.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/display-shapes-with-svg.english.md
@@ -26,15 +26,15 @@ Add a <code>rect</code> shape to the <code>svg</code> using <code>append()</code
 ```yml
 tests:
   - text: Your document should have 1 <code>rect</code> element.
-    testString: 'assert($("rect").length == 1, "Your document should have 1 <code>rect</code> element.");'
+    testString: assert($('rect').length == 1, 'Your document should have 1 <code>rect</code> element.');
   - text: The <code>rect</code> element should have a <code>width</code> attribute set to 25.
-    testString: 'assert($("rect").attr("width") == "25", "The <code>rect</code> element should have a <code>width</code> attribute set to 25.");'
+    testString: assert($('rect').attr('width') == '25', 'The <code>rect</code> element should have a <code>width</code> attribute set to 25.');
   - text: The <code>rect</code> element should have a <code>height</code> attribute set to 100.
-    testString: 'assert($("rect").attr("height") == "100", "The <code>rect</code> element should have a <code>height</code> attribute set to 100.");'
+    testString: assert($('rect').attr('height') == '100', 'The <code>rect</code> element should have a <code>height</code> attribute set to 100.');
   - text: The <code>rect</code> element should have an <code>x</code> attribute set to 0.
-    testString: 'assert($("rect").attr("x") == "0", "The <code>rect</code> element should have an <code>x</code> attribute set to 0.");'
+    testString: assert($('rect').attr('x') == '0', 'The <code>rect</code> element should have an <code>x</code> attribute set to 0.');
   - text: The <code>rect</code> element should have a <code>y</code> attribute set to 0.
-    testString: 'assert($("rect").attr("y") == "0", "The <code>rect</code> element should have a <code>y</code> attribute set to 0.");'
+    testString: assert($('rect').attr('y') == '0', 'The <code>rect</code> element should have a <code>y</code> attribute set to 0.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-change-the-height-of-each-bar.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-change-the-height-of-each-bar.english.md
index 95528e1ced..d6374d7156 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-change-the-height-of-each-bar.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-change-the-height-of-each-bar.english.md
@@ -24,23 +24,23 @@ Change the callback function for the <code>height</code> attribute to return the
 ```yml
 tests:
   - text: The first <code>rect</code> should have a <code>height</code> of 36.
-    testString: 'assert($("rect").eq(0).attr("height") == "36", "The first <code>rect</code> should have a <code>height</code> of 36.");'
+    testString: assert($('rect').eq(0).attr('height') == '36', 'The first <code>rect</code> should have a <code>height</code> of 36.');
   - text: The second <code>rect</code> should have a <code>height</code> of 93.
-    testString: 'assert($("rect").eq(1).attr("height") == "93", "The second <code>rect</code> should have a <code>height</code> of 93.");'
+    testString: assert($('rect').eq(1).attr('height') == '93', 'The second <code>rect</code> should have a <code>height</code> of 93.');
   - text: The third <code>rect</code> should have a <code>height</code> of 66.
-    testString: 'assert($("rect").eq(2).attr("height") == "66", "The third <code>rect</code> should have a <code>height</code> of 66.");'
+    testString: assert($('rect').eq(2).attr('height') == '66', 'The third <code>rect</code> should have a <code>height</code> of 66.');
   - text: The fourth <code>rect</code> should have a <code>height</code> of 51.
-    testString: 'assert($("rect").eq(3).attr("height") == "51", "The fourth <code>rect</code> should have a <code>height</code> of 51.");'
+    testString: assert($('rect').eq(3).attr('height') == '51', 'The fourth <code>rect</code> should have a <code>height</code> of 51.');
   - text: The fifth <code>rect</code> should have a <code>height</code> of 75.
-    testString: 'assert($("rect").eq(4).attr("height") == "75", "The fifth <code>rect</code> should have a <code>height</code> of 75.");'
+    testString: assert($('rect').eq(4).attr('height') == '75', 'The fifth <code>rect</code> should have a <code>height</code> of 75.');
   - text: The sixth <code>rect</code> should have a <code>height</code> of 54.
-    testString: 'assert($("rect").eq(5).attr("height") == "54", "The sixth <code>rect</code> should have a <code>height</code> of 54.");'
+    testString: assert($('rect').eq(5).attr('height') == '54', 'The sixth <code>rect</code> should have a <code>height</code> of 54.');
   - text: The seventh <code>rect</code> should have a <code>height</code> of 87.
-    testString: 'assert($("rect").eq(6).attr("height") == "87", "The seventh <code>rect</code> should have a <code>height</code> of 87.");'
+    testString: assert($('rect').eq(6).attr('height') == '87', 'The seventh <code>rect</code> should have a <code>height</code> of 87.');
   - text: The eighth <code>rect</code> should have a <code>height</code> of 42.
-    testString: 'assert($("rect").eq(7).attr("height") == "42", "The eighth <code>rect</code> should have a <code>height</code> of 42.");'
+    testString: assert($('rect').eq(7).attr('height') == '42', 'The eighth <code>rect</code> should have a <code>height</code> of 42.');
   - text: The ninth <code>rect</code> should have a <code>height</code> of 27.
-    testString: 'assert($("rect").eq(8).attr("height") == "27", "The ninth <code>rect</code> should have a <code>height</code> of 27.");'
+    testString: assert($('rect').eq(8).attr('height') == '27', 'The ninth <code>rect</code> should have a <code>height</code> of 27.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-set-the-coordinates-for-each-bar.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-set-the-coordinates-for-each-bar.english.md
index 3cd34df78f..218aee9f0c 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-set-the-coordinates-for-each-bar.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/dynamically-set-the-coordinates-for-each-bar.english.md
@@ -28,23 +28,23 @@ Change the <code>x</code> attribute callback function so it returns the index ti
 ```yml
 tests:
   - text: The first <code>rect</code> should have an <code>x</code> value of 0.
-    testString: 'assert($("rect").eq(0).attr("x") == "0", "The first <code>rect</code> should have an <code>x</code> value of 0.");'
+    testString: assert($('rect').eq(0).attr('x') == '0', 'The first <code>rect</code> should have an <code>x</code> value of 0.');
   - text: The second <code>rect</code> should have an <code>x</code> value of 30.
-    testString: 'assert($("rect").eq(1).attr("x") == "30", "The second <code>rect</code> should have an <code>x</code> value of 30.");'
+    testString: assert($('rect').eq(1).attr('x') == '30', 'The second <code>rect</code> should have an <code>x</code> value of 30.');
   - text: The third <code>rect</code> should have an <code>x</code> value of 60.
-    testString: 'assert($("rect").eq(2).attr("x") == "60", "The third <code>rect</code> should have an <code>x</code> value of 60.");'
+    testString: assert($('rect').eq(2).attr('x') == '60', 'The third <code>rect</code> should have an <code>x</code> value of 60.');
   - text: The fourth <code>rect</code> should have an <code>x</code> value of 90.
-    testString: 'assert($("rect").eq(3).attr("x") == "90", "The fourth <code>rect</code> should have an <code>x</code> value of 90.");'
+    testString: assert($('rect').eq(3).attr('x') == '90', 'The fourth <code>rect</code> should have an <code>x</code> value of 90.');
   - text: The fifth <code>rect</code> should have an <code>x</code> value of 120.
-    testString: 'assert($("rect").eq(4).attr("x") == "120", "The fifth <code>rect</code> should have an <code>x</code> value of 120.");'
+    testString: assert($('rect').eq(4).attr('x') == '120', 'The fifth <code>rect</code> should have an <code>x</code> value of 120.');
   - text: The sixth <code>rect</code> should have an <code>x</code> value of 150.
-    testString: 'assert($("rect").eq(5).attr("x") == "150", "The sixth <code>rect</code> should have an <code>x</code> value of 150.");'
+    testString: assert($('rect').eq(5).attr('x') == '150', 'The sixth <code>rect</code> should have an <code>x</code> value of 150.');
   - text: The seventh <code>rect</code> should have an <code>x</code> value of 180.
-    testString: 'assert($("rect").eq(6).attr("x") == "180", "The seventh <code>rect</code> should have an <code>x</code> value of 180.");'
+    testString: assert($('rect').eq(6).attr('x') == '180', 'The seventh <code>rect</code> should have an <code>x</code> value of 180.');
   - text: The eighth <code>rect</code> should have an <code>x</code> value of 210.
-    testString: 'assert($("rect").eq(7).attr("x") == "210", "The eighth <code>rect</code> should have an <code>x</code> value of 210.");'
+    testString: assert($('rect').eq(7).attr('x') == '210', 'The eighth <code>rect</code> should have an <code>x</code> value of 210.');
   - text: The ninth <code>rect</code> should have an <code>x</code> value of 240.
-    testString: 'assert($("rect").eq(8).attr("x") == "240", "The ninth <code>rect</code> should have an <code>x</code> value of 240.");'
+    testString: assert($('rect').eq(8).attr('x') == '240', 'The ninth <code>rect</code> should have an <code>x</code> value of 240.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/invert-svg-elements.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/invert-svg-elements.english.md
index 3f534283ed..30d1731c2f 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/invert-svg-elements.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/invert-svg-elements.english.md
@@ -27,23 +27,23 @@ Change the callback function for the <code>y</code> attribute to set the bars ri
 ```yml
 tests:
   - text: The first <code>rect</code> should have a <code>y</code> value of 64.
-    testString: 'assert($("rect").eq(0).attr("y") == h - (dataset[0] * 3), "The first <code>rect</code> should have a <code>y</code> value of 64.");'
+    testString: assert($('rect').eq(0).attr('y') == h - (dataset[0] * 3), 'The first <code>rect</code> should have a <code>y</code> value of 64.');
   - text: The second <code>rect</code> should have a <code>y</code> value of 7.
-    testString: 'assert($("rect").eq(1).attr("y") == h - (dataset[1] * 3), "The second <code>rect</code> should have a <code>y</code> value of 7.");'
+    testString: assert($('rect').eq(1).attr('y') == h - (dataset[1] * 3), 'The second <code>rect</code> should have a <code>y</code> value of 7.');
   - text: The third <code>rect</code> should have a <code>y</code> value of 34.
-    testString: 'assert($("rect").eq(2).attr("y") == h - (dataset[2] * 3), "The third <code>rect</code> should have a <code>y</code> value of 34.");'
+    testString: assert($('rect').eq(2).attr('y') == h - (dataset[2] * 3), 'The third <code>rect</code> should have a <code>y</code> value of 34.');
   - text: The fourth <code>rect</code> should have a <code>y</code> value of 49.
-    testString: 'assert($("rect").eq(3).attr("y") == h - (dataset[3] * 3), "The fourth <code>rect</code> should have a <code>y</code> value of 49.");'
+    testString: assert($('rect').eq(3).attr('y') == h - (dataset[3] * 3), 'The fourth <code>rect</code> should have a <code>y</code> value of 49.');
   - text: The fifth <code>rect</code> should have a <code>y</code> value of 25.
-    testString: 'assert($("rect").eq(4).attr("y") == h - (dataset[4] * 3), "The fifth <code>rect</code> should have a <code>y</code> value of 25.");'
+    testString: assert($('rect').eq(4).attr('y') == h - (dataset[4] * 3), 'The fifth <code>rect</code> should have a <code>y</code> value of 25.');
   - text: The sixth <code>rect</code> should have a <code>y</code> value of 46.
-    testString: 'assert($("rect").eq(5).attr("y") == h - (dataset[5] * 3), "The sixth <code>rect</code> should have a <code>y</code> value of 46.");'
+    testString: assert($('rect').eq(5).attr('y') == h - (dataset[5] * 3), 'The sixth <code>rect</code> should have a <code>y</code> value of 46.');
   - text: The seventh <code>rect</code> should have a <code>y</code> value of 13.
-    testString: 'assert($("rect").eq(6).attr("y") == h - (dataset[6] * 3), "The seventh <code>rect</code> should have a <code>y</code> value of 13.");'
+    testString: assert($('rect').eq(6).attr('y') == h - (dataset[6] * 3), 'The seventh <code>rect</code> should have a <code>y</code> value of 13.');
   - text: The eighth <code>rect</code> should have a <code>y</code> value of 58.
-    testString: 'assert($("rect").eq(7).attr("y") == h - (dataset[7] * 3), "The eighth <code>rect</code> should have a <code>y</code> value of 58.");'
+    testString: assert($('rect').eq(7).attr('y') == h - (dataset[7] * 3), 'The eighth <code>rect</code> should have a <code>y</code> value of 58.');
   - text: The ninth <code>rect</code> should have a <code>y</code> value of 73.
-    testString: 'assert($("rect").eq(8).attr("y") == h - (dataset[8] * 3), "The ninth <code>rect</code> should have a <code>y</code> value of 73.");'
+    testString: assert($('rect').eq(8).attr('y') == h - (dataset[8] * 3), 'The ninth <code>rect</code> should have a <code>y</code> value of 73.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/learn-about-svg-in-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/learn-about-svg-in-d3.english.md
index abeea02f25..65dd78320f 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/learn-about-svg-in-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/learn-about-svg-in-d3.english.md
@@ -26,11 +26,11 @@ Add an <code>svg</code> node to the <code>body</code> using <code>append()</code
 ```yml
 tests:
   - text: Your document should have 1 <code>svg</code> element.
-    testString: 'assert($("svg").length == 1, "Your document should have 1 <code>svg</code> element.");'
+    testString: assert($('svg').length == 1, 'Your document should have 1 <code>svg</code> element.');
   - text: The <code>svg</code> element should have a <code>width</code> attribute set to 500.
-    testString: 'assert($("svg").attr("width") == "500", "The <code>svg</code> element should have a <code>width</code> attribute set to 500.");'
+    testString: assert($('svg').attr('width') == '500', 'The <code>svg</code> element should have a <code>width</code> attribute set to 500.');
   - text: The <code>svg</code> element should have a <code>height</code> attribute set to 100.
-    testString: 'assert($("svg").attr("height") == "100", "The <code>svg</code> element should have a <code>height</code> attribute set to 100.");'
+    testString: assert($('svg').attr('height') == '100', 'The <code>svg</code> element should have a <code>height</code> attribute set to 100.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/select-a-group-of-elements-with-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/select-a-group-of-elements-with-d3.english.md
index 6630416fce..82b5244f91 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/select-a-group-of-elements-with-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/select-a-group-of-elements-with-d3.english.md
@@ -23,12 +23,12 @@ Select all of the <code>li</code> tags in the document, and change their text to
 
 ```yml
 tests:
-  - text: 'There should be 3 <code>li</code> elements on the page, and the text in each one should say "list item". Capitalization and spacing should match exactly.'
-    testString: 'assert($("li").text().match(/list item/g).length == 3, "There should be 3 <code>li</code> elements on the page, and the text in each one should say "list item". Capitalization and spacing should match exactly.");'
+  - text: There should be 3 <code>li</code> elements on the page, and the text in each one should say "list item". Capitalization and spacing should match exactly.
+    testString: assert($('li').text().match(/list item/g).length == 3, 'There should be 3 <code>li</code> elements on the page, and the text in each one should say "list item". Capitalization and spacing should match exactly.');
   - text: Your code should access the <code>d3</code> object.
-    testString: 'assert(code.match(/d3/g), "Your code should access the <code>d3</code> object.");'
+    testString: assert(code.match(/d3/g), 'Your code should access the <code>d3</code> object.');
   - text: Your code should use the <code>selectAll</code> method.
-    testString: 'assert(code.match(/\.selectAll/g), "Your code should use the <code>selectAll</code> method.");'
+    testString: assert(code.match(/\.selectAll/g), 'Your code should use the <code>selectAll</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.english.md
index 5da66e8234..96df8032d1 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.english.md
@@ -28,15 +28,15 @@ Create a scale and set its domain to <code>[250, 500]</code> and range to <code>
 ```yml
 tests:
   - text: Your code should use the <code>domain()</code> method.
-    testString: 'assert(code.match(/\.domain/g), "Your code should use the <code>domain()</code> method.");'
-  - text: 'The <code>domain()</code> of the scale should be set to <code>[250, 500]</code>.'
-    testString: 'assert(JSON.stringify(scale.domain()) == JSON.stringify([250, 500]), "The <code>domain()</code> of the scale should be set to <code>[250, 500]</code>.");'
+    testString: assert(code.match(/\.domain/g), 'Your code should use the <code>domain()</code> method.');
+  - text: The <code>domain()</code> of the scale should be set to <code>[250, 500]</code>.
+    testString: assert(JSON.stringify(scale.domain()) == JSON.stringify([250, 500]), 'The <code>domain()</code> of the scale should be set to <code>[250, 500]</code>.');
   - text: Your code should use the <code>range()</code> method.
-    testString: 'assert(code.match(/\.range/g), "Your code should use the <code>range()</code> method.");'
-  - text: 'The <code>range()</code> of the scale should be set to <code>[10, 150]</code>.'
-    testString: 'assert(JSON.stringify(scale.range()) == JSON.stringify([10, 150]), "The <code>range()</code> of the scale should be set to <code>[10, 150]</code>.");'
+    testString: assert(code.match(/\.range/g), 'Your code should use the <code>range()</code> method.');
+  - text: The <code>range()</code> of the scale should be set to <code>[10, 150]</code>.
+    testString: assert(JSON.stringify(scale.range()) == JSON.stringify([10, 150]), 'The <code>range()</code> of the scale should be set to <code>[10, 150]</code>.');
   - text: The text in the <code>h2</code> should be -102.
-    testString: 'assert($("h2").text() == "-102", "The text in the <code>h2</code> should be -102.");'
+    testString: assert($('h2').text() == '-102', 'The text in the <code>h2</code> should be -102.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/style-d3-labels.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/style-d3-labels.english.md
index e38fa91576..bf7bf27a85 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/style-d3-labels.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/style-d3-labels.english.md
@@ -22,9 +22,9 @@ Set the <code>font-size</code> of the <code>text</code> elements to 25px, and th
 ```yml
 tests:
   - text: The labels should all have a <code>fill</code> color of red.
-    testString: 'assert($("text").css("fill") == "rgb(255, 0, 0)", "The labels should all have a <code>fill</code> color of red.");'
+    testString: assert($('text').css('fill') == 'rgb(255, 0, 0)', 'The labels should all have a <code>fill</code> color of red.');
   - text: The labels should all have a <code>font-size</code> of 25 pixels.
-    testString: 'assert($("text").css("font-size") == "25px", "The labels should all have a <code>font-size</code> of 25 pixels.");'
+    testString: assert($('text').css('font-size') == '25px', 'The labels should all have a <code>font-size</code> of 25 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/update-the-height-of-an-element-dynamically.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/update-the-height-of-an-element-dynamically.english.md
index e95197e56a..20168f71c3 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/update-the-height-of-an-element-dynamically.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/update-the-height-of-an-element-dynamically.english.md
@@ -26,23 +26,23 @@ Add the <code>style()</code> method to the code in the editor to set the <code>h
 ```yml
 tests:
   - text: The first <code>div</code> should have a <code>height</code> of 12 pixels.
-    testString: 'assert($("div").eq(0).css("height") == "12px", "The first <code>div</code> should have a <code>height</code> of 12 pixels.");'
+    testString: assert($('div').eq(0).css('height') == '12px', 'The first <code>div</code> should have a <code>height</code> of 12 pixels.');
   - text: The second <code>div</code> should have a <code>height</code> of 31 pixels.
-    testString: 'assert($("div").eq(1).css("height") == "31px", "The second <code>div</code> should have a <code>height</code> of 31 pixels.");'
+    testString: assert($('div').eq(1).css('height') == '31px', 'The second <code>div</code> should have a <code>height</code> of 31 pixels.');
   - text: The third <code>div</code> should have a <code>height</code> of 22 pixels.
-    testString: 'assert($("div").eq(2).css("height") == "22px", "The third <code>div</code> should have a <code>height</code> of 22 pixels.");'
+    testString: assert($('div').eq(2).css('height') == '22px', 'The third <code>div</code> should have a <code>height</code> of 22 pixels.');
   - text: The fourth <code>div</code> should have a <code>height</code> of 17 pixels.
-    testString: 'assert($("div").eq(3).css("height") == "17px", "The fourth <code>div</code> should have a <code>height</code> of 17 pixels.");'
+    testString: assert($('div').eq(3).css('height') == '17px', 'The fourth <code>div</code> should have a <code>height</code> of 17 pixels.');
   - text: The fifth <code>div</code> should have a <code>height</code> of 25 pixels.
-    testString: 'assert($("div").eq(4).css("height") == "25px", "The fifth <code>div</code> should have a <code>height</code> of 25 pixels.");'
+    testString: assert($('div').eq(4).css('height') == '25px', 'The fifth <code>div</code> should have a <code>height</code> of 25 pixels.');
   - text: The sixth <code>div</code> should have a <code>height</code> of 18 pixels.
-    testString: 'assert($("div").eq(5).css("height") == "18px", "The sixth <code>div</code> should have a <code>height</code> of 18 pixels.");'
+    testString: assert($('div').eq(5).css('height') == '18px', 'The sixth <code>div</code> should have a <code>height</code> of 18 pixels.');
   - text: The seventh <code>div</code> should have a <code>height</code> of 29 pixels.
-    testString: 'assert($("div").eq(6).css("height") == "29px", "The seventh <code>div</code> should have a <code>height</code> of 29 pixels.");'
+    testString: assert($('div').eq(6).css('height') == '29px', 'The seventh <code>div</code> should have a <code>height</code> of 29 pixels.');
   - text: The eighth <code>div</code> should have a <code>height</code> of 14 pixels.
-    testString: 'assert($("div").eq(7).css("height") == "14px", "The eighth <code>div</code> should have a <code>height</code> of 14 pixels.");'
+    testString: assert($('div').eq(7).css('height') == '14px', 'The eighth <code>div</code> should have a <code>height</code> of 14 pixels.');
   - text: The ninth <code>div</code> should have a <code>height</code> of 9 pixels.
-    testString: 'assert($("div").eq(8).css("height") == "9px", "The ninth <code>div</code> should have a <code>height</code> of 9 pixels.");'
+    testString: assert($('div').eq(8).css('height') == '9px', 'The ninth <code>div</code> should have a <code>height</code> of 9 pixels.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.english.md
index 703c873afb..61ddc8e029 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements.english.md
@@ -26,49 +26,49 @@ For the <code>text</code> elements, apply the scales to set the <code>x</code> a
 ```yml
 tests:
   - text: Your code should have 10 <code>circle</code> elements.
-    testString: 'assert($("circle").length == 10, "Your code should have 10 <code>circle</code> elements.");'
+    testString: assert($('circle').length == 10, 'Your code should have 10 <code>circle</code> elements.');
   - text: The first <code>circle</code> element should have a <code>cx</code> value of approximately 91 and a <code>cy</code> value of approximately 368 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(0).attr("cx")) == "91" && Math.round($("circle").eq(0).attr("cy")) == "368" && $("circle").eq(0).attr("r") == "5", "The first <code>circle</code> element should have a <code>cx</code> value of approximately 91 and a <code>cy</code> value of approximately 368 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(0).attr('cx')) == '91' && Math.round($('circle').eq(0).attr('cy')) == '368' && $('circle').eq(0).attr('r') == '5', 'The first <code>circle</code> element should have a <code>cx</code> value of approximately 91 and a <code>cy</code> value of approximately 368 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The second <code>circle</code> element should have a <code>cx</code> value of approximately 159 and a <code>cy</code> value of approximately 181 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(1).attr("cx")) == "159" && Math.round($("circle").eq(1).attr("cy")) == "181" && $("circle").eq(1).attr("r") == "5", "The second <code>circle</code> element should have a <code>cx</code> value of approximately 159 and a <code>cy</code> value of approximately 181 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(1).attr('cx')) == '159' && Math.round($('circle').eq(1).attr('cy')) == '181' && $('circle').eq(1).attr('r') == '5', 'The second <code>circle</code> element should have a <code>cx</code> value of approximately 159 and a <code>cy</code> value of approximately 181 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The third <code>circle</code> element should have a <code>cx</code> value of approximately 340 and a <code>cy</code> value of approximately 329 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(2).attr("cx")) == "340" && Math.round($("circle").eq(2).attr("cy")) == "329" && $("circle").eq(2).attr("r") == "5", "The third <code>circle</code> element should have a <code>cx</code> value of approximately 340 and a <code>cy</code> value of approximately 329 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(2).attr('cx')) == '340' && Math.round($('circle').eq(2).attr('cy')) == '329' && $('circle').eq(2).attr('r') == '5', 'The third <code>circle</code> element should have a <code>cx</code> value of approximately 340 and a <code>cy</code> value of approximately 329 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The fourth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 60 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(3).attr("cx")) == "131" && Math.round($("circle").eq(3).attr("cy")) == "60" && $("circle").eq(3).attr("r") == "5", "The fourth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 60 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(3).attr('cx')) == '131' && Math.round($('circle').eq(3).attr('cy')) == '60' && $('circle').eq(3).attr('r') == '5', 'The fourth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 60 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The fifth <code>circle</code> element should have a <code>cx</code> value of approximately 440 and a <code>cy</code> value of approximately 237 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(4).attr("cx")) == "440" && Math.round($("circle").eq(4).attr("cy")) == "237" && $("circle").eq(4).attr("r") == "5", "The fifth <code>circle</code> element should have a <code>cx</code> value of approximately 440 and a <code>cy</code> value of approximately 237 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(4).attr('cx')) == '440' && Math.round($('circle').eq(4).attr('cy')) == '237' && $('circle').eq(4).attr('r') == '5', 'The fifth <code>circle</code> element should have a <code>cx</code> value of approximately 440 and a <code>cy</code> value of approximately 237 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The sixth <code>circle</code> element should have a <code>cx</code> value of approximately 271 and a <code>cy</code> value of approximately 306 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(5).attr("cx")) == "271" && Math.round($("circle").eq(5).attr("cy")) == "306" && $("circle").eq(5).attr("r") == "5", "The sixth <code>circle</code> element should have a <code>cx</code> value of approximately 271 and a <code>cy</code> value of approximately 306 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(5).attr('cx')) == '271' && Math.round($('circle').eq(5).attr('cy')) == '306' && $('circle').eq(5).attr('r') == '5', 'The sixth <code>circle</code> element should have a <code>cx</code> value of approximately 271 and a <code>cy</code> value of approximately 306 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The seventh <code>circle</code> element should have a <code>cx</code> value of approximately 361 and a <code>cy</code> value of approximately 351 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(6).attr("cx")) == "361" && Math.round($("circle").eq(6).attr("cy")) == "351" && $("circle").eq(6).attr("r") == "5", "The seventh <code>circle</code> element should have a <code>cx</code> value of approximately 361 and a <code>cy</code> value of approximately 351 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(6).attr('cx')) == '361' && Math.round($('circle').eq(6).attr('cy')) == '351' && $('circle').eq(6).attr('r') == '5', 'The seventh <code>circle</code> element should have a <code>cx</code> value of approximately 361 and a <code>cy</code> value of approximately 351 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The eighth <code>circle</code> element should have a <code>cx</code> value of approximately 261 and a <code>cy</code> value of approximately 132 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(7).attr("cx")) == "261" && Math.round($("circle").eq(7).attr("cy")) == "132" && $("circle").eq(7).attr("r") == "5", "The eighth <code>circle</code> element should have a <code>cx</code> value of approximately 261 and a <code>cy</code> value of approximately 132 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(7).attr('cx')) == '261' && Math.round($('circle').eq(7).attr('cy')) == '132' && $('circle').eq(7).attr('r') == '5', 'The eighth <code>circle</code> element should have a <code>cx</code> value of approximately 261 and a <code>cy</code> value of approximately 132 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The ninth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 144 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(8).attr("cx")) == "131" && Math.round($("circle").eq(8).attr("cy")) == "144" && $("circle").eq(8).attr("r") == "5", "The ninth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 144 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(8).attr('cx')) == '131' && Math.round($('circle').eq(8).attr('cy')) == '144' && $('circle').eq(8).attr('r') == '5', 'The ninth <code>circle</code> element should have a <code>cx</code> value of approximately 131 and a <code>cy</code> value of approximately 144 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: The tenth <code>circle</code> element should have a <code>cx</code> value of approximately 79 and a <code>cy</code> value of approximately 326 after applying the scales. It should also have an <code>r</code> value of 5.
-    testString: 'assert(Math.round($("circle").eq(9).attr("cx")) == "79" && Math.round($("circle").eq(9).attr("cy")) == "326" && $("circle").eq(9).attr("r") == "5", "The tenth <code>circle</code> element should have a <code>cx</code> value of approximately 79 and a <code>cy</code> value of approximately 326 after applying the scales. It should also have an <code>r</code> value of 5.");'
+    testString: assert(Math.round($('circle').eq(9).attr('cx')) == '79' && Math.round($('circle').eq(9).attr('cy')) == '326' && $('circle').eq(9).attr('r') == '5', 'The tenth <code>circle</code> element should have a <code>cx</code> value of approximately 79 and a <code>cy</code> value of approximately 326 after applying the scales. It should also have an <code>r</code> value of 5.');
   - text: Your code should have 10 <code>text</code> elements.
-    testString: 'assert($("text").length == 10, "Your code should have 10 <code>text</code> elements.");'
+    testString: assert($('text').length == 10, 'Your code should have 10 <code>text</code> elements.');
   - text: The first label should have an <code>x</code> value of approximately 100 and a <code>y</code> value of approximately 368 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(0).attr("x")) == "100" && Math.round($("text").eq(0).attr("y")) == "368", "The first label should have an <code>x</code> value of approximately 100 and a <code>y</code> value of approximately 368 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(0).attr('x')) == '100' && Math.round($('text').eq(0).attr('y')) == '368', 'The first label should have an <code>x</code> value of approximately 100 and a <code>y</code> value of approximately 368 after applying the scales.');
   - text: The second label should have an <code>x</code> value of approximately 168 and a <code>y</code> value of approximately 181 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(1).attr("x")) == "168" && Math.round($("text").eq(1).attr("y")) == "181", "The second label should have an <code>x</code> value of approximately 168 and a <code>y</code> value of approximately 181 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(1).attr('x')) == '168' && Math.round($('text').eq(1).attr('y')) == '181', 'The second label should have an <code>x</code> value of approximately 168 and a <code>y</code> value of approximately 181 after applying the scales.');
   - text: The third label should have an <code>x</code> value of approximately 350 and a <code>y</code> value of approximately 329 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(2).attr("x")) == "350" && Math.round($("text").eq(2).attr("y")) == "329", "The third label should have an <code>x</code> value of approximately 350 and a <code>y</code> value of approximately 329 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(2).attr('x')) == '350' && Math.round($('text').eq(2).attr('y')) == '329', 'The third label should have an <code>x</code> value of approximately 350 and a <code>y</code> value of approximately 329 after applying the scales.');
   - text: The fourth label should have an <code>x</code> value of approximately 141 and a <code>y</code> value of approximately 60 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(3).attr("x")) == "141" && Math.round($("text").eq(3).attr("y")) == "60", "The fourth label should have an <code>x</code> value of approximately 141 and a <code>y</code> value of approximately 60 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(3).attr('x')) == '141' && Math.round($('text').eq(3).attr('y')) == '60', 'The fourth label should have an <code>x</code> value of approximately 141 and a <code>y</code> value of approximately 60 after applying the scales.');
   - text: The fifth label should have an <code>x</code> value of approximately 449 and a <code>y</code> value of approximately 237 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(4).attr("x")) == "449" && Math.round($("text").eq(4).attr("y")) == "237", "The fifth label should have an <code>x</code> value of approximately 449 and a <code>y</code> value of approximately 237 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(4).attr('x')) == '449' && Math.round($('text').eq(4).attr('y')) == '237', 'The fifth label should have an <code>x</code> value of approximately 449 and a <code>y</code> value of approximately 237 after applying the scales.');
   - text: The sixth label should have an <code>x</code> value of approximately 280 and a <code>y</code> value of approximately 306 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(5).attr("x")) == "280" && Math.round($("text").eq(5).attr("y")) == "306", "The sixth label should have an <code>x</code> value of approximately 280 and a <code>y</code> value of approximately 306 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(5).attr('x')) == '280' && Math.round($('text').eq(5).attr('y')) == '306', 'The sixth label should have an <code>x</code> value of approximately 280 and a <code>y</code> value of approximately 306 after applying the scales.');
   - text: The seventh label should have an <code>x</code> value of approximately 370 and a <code>y</code> value of approximately 351 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(6).attr("x")) == "370" && Math.round($("text").eq(6).attr("y")) == "351", "The seventh label should have an <code>x</code> value of approximately 370 and a <code>y</code> value of approximately 351 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(6).attr('x')) == '370' && Math.round($('text').eq(6).attr('y')) == '351', 'The seventh label should have an <code>x</code> value of approximately 370 and a <code>y</code> value of approximately 351 after applying the scales.');
   - text: The eighth label should have an <code>x</code> value of approximately 270 and a <code>y</code> value of approximately 132 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(7).attr("x")) == "270" && Math.round($("text").eq(7).attr("y")) == "132", "The eighth label should have an <code>x</code> value of approximately 270 and a <code>y</code> value of approximately 132 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(7).attr('x')) == '270' && Math.round($('text').eq(7).attr('y')) == '132', 'The eighth label should have an <code>x</code> value of approximately 270 and a <code>y</code> value of approximately 132 after applying the scales.');
   - text: The ninth label should have an <code>x</code> value of approximately 140 and a <code>y</code> value of approximately 144 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(8).attr("x")) == "140" && Math.round($("text").eq(8).attr("y")) == "144", "The ninth label should have an <code>x</code> value of approximately 140 and a <code>y</code> value of approximately 144 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(8).attr('x')) == '140' && Math.round($('text').eq(8).attr('y')) == '144', 'The ninth label should have an <code>x</code> value of approximately 140 and a <code>y</code> value of approximately 144 after applying the scales.');
   - text: The tenth label should have an <code>x</code> value of approximately 88 and a <code>y</code> value of approximately 326 after applying the scales.
-    testString: 'assert(Math.round($("text").eq(9).attr("x")) == "88" && Math.round($("text").eq(9).attr("y")) == "326", "The tenth label should have an <code>x</code> value of approximately 88 and a <code>y</code> value of approximately 326 after applying the scales.");'
+    testString: assert(Math.round($('text').eq(9).attr('x')) == '88' && Math.round($('text').eq(9).attr('y')) == '326', 'The tenth label should have an <code>x</code> value of approximately 88 and a <code>y</code> value of approximately 326 after applying the scales.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.english.md
index b766abdf52..9c3a833eaa 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-dynamic-scales.english.md
@@ -28,11 +28,11 @@ Use the <code>yScale</code> variable to create a linear y-axis scale. The domain
 ```yml
 tests:
   - text: The text in the <code>h2</code> should be 30.
-    testString: 'assert(output == 30 && $("h2").text() == "30", "The text in the <code>h2</code> should be 30.");'
-  - text: 'The <code>domain()</code> of yScale should be equivalent to <code>[0, 411]</code>.'
-    testString: 'assert(JSON.stringify(yScale.domain()) == JSON.stringify([0, 411]), "The <code>domain()</code> of yScale should be equivalent to <code>[0, 411]</code>.");'
-  - text: 'The <code>range()</code> of yScale should be equivalent to <code>[470, 30]</code>.'
-    testString: 'assert(JSON.stringify(yScale.range()) == JSON.stringify([470, 30]), "The <code>range()</code> of yScale should be equivalent to <code>[470, 30]</code>.");'
+    testString: assert(output == 30 && $('h2').text() == '30', 'The text in the <code>h2</code> should be 30.');
+  - text: The <code>domain()</code> of yScale should be equivalent to <code>[0, 411]</code>.
+    testString: assert(JSON.stringify(yScale.domain()) == JSON.stringify([0, 411]), 'The <code>domain()</code> of yScale should be equivalent to <code>[0, 411]</code>.');
+  - text: The <code>range()</code> of yScale should be equivalent to <code>[470, 30]</code>.
+    testString: assert(JSON.stringify(yScale.range()) == JSON.stringify([470, 30]), 'The <code>range()</code> of yScale should be equivalent to <code>[470, 30]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-the-d3.max-and-d3.min-functions-to-find-minimum-and-maximum-values-in-a-dataset.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-the-d3.max-and-d3.min-functions-to-find-minimum-and-maximum-values-in-a-dataset.english.md
index 4e98c7c52a..30985bc96d 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-the-d3.max-and-d3.min-functions-to-find-minimum-and-maximum-values-in-a-dataset.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/use-the-d3.max-and-d3.min-functions-to-find-minimum-and-maximum-values-in-a-dataset.english.md
@@ -30,9 +30,9 @@ The <code>positionData</code> variable holds a 3-dimensional (3D) array. Use a D
 ```yml
 tests:
   - text: The text in the <code>h2</code> should be 8.
-    testString: 'assert(output == 8 && $("h2").text() == "8", "The text in the <code>h2</code> should be 8.");'
+    testString: assert(output == 8 && $('h2').text() == '8', 'The text in the <code>h2</code> should be 8.');
   - text: Your code should use the <code>max()</code> method.
-    testString: 'assert(code.match(/\.max/g), "Your code should use the <code>max()</code> method.")'
+    testString: assert(code.match(/\.max/g), 'Your code should use the <code>max()</code> method.')
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-data-in-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-data-in-d3.english.md
index 55abb4b9b9..0941e842af 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-data-in-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-data-in-d3.english.md
@@ -28,13 +28,13 @@ Select the <code>body</code> node, then select all <code>h2</code> elements. Hav
 ```yml
 tests:
   - text: Your document should have 9 <code>h2</code> elements.
-    testString: 'assert($("h2").length == 9, "Your document should have 9 <code>h2</code> elements.");'
+    testString: assert($('h2').length == 9, 'Your document should have 9 <code>h2</code> elements.');
   - text: The text in the <code>h2</code> elements should say "New Title". The capitalization and spacing should match exactly.
-    testString: 'assert($("h2").text().match(/New Title/g).length == 9, "The text in the <code>h2</code> elements should say "New Title". The capitalization and spacing should match exactly.");'
+    testString: assert($('h2').text().match(/New Title/g).length == 9, 'The text in the <code>h2</code> elements should say "New Title". The capitalization and spacing should match exactly.');
   - text: Your code should use the <code>data()</code> method.
-    testString: 'assert(code.match(/\.data/g), "Your code should use the <code>data()</code> method.");'
+    testString: assert(code.match(/\.data/g), 'Your code should use the <code>data()</code> method.');
   - text: Your code should use the <code>enter()</code> method.
-    testString: 'assert(code.match(/\.enter/g), "Your code should use the <code>enter()</code> method.");'
+    testString: assert(code.match(/\.enter/g), 'Your code should use the <code>enter()</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-dynamic-data-in-d3.english.md b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-dynamic-data-in-d3.english.md
index a404b3f0da..139a4800bc 100644
--- a/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-dynamic-data-in-d3.english.md
+++ b/curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/work-with-dynamic-data-in-d3.english.md
@@ -27,23 +27,23 @@ Change the <code>text()</code> method so that each <code>h2</code> element displ
 ```yml
 tests:
   - text: The first <code>h2</code> should have the text "12 USD".
-    testString: 'assert($("h2").eq(0).text() == "12 USD", "The first <code>h2</code> should have the text "12 USD".");'
+    testString: assert($('h2').eq(0).text() == "12 USD", 'The first <code>h2</code> should have the text "12 USD".');
   - text: The second <code>h2</code> should have the text "31 USD".
-    testString: 'assert($("h2").eq(1).text() == "31 USD", "The second <code>h2</code> should have the text "31 USD".");'
+    testString: assert($('h2').eq(1).text() == "31 USD", 'The second <code>h2</code> should have the text "31 USD".');
   - text: The third <code>h2</code> should have the text "22 USD".
-    testString: 'assert($("h2").eq(2).text() == "22 USD", "The third <code>h2</code> should have the text "22 USD".");'
+    testString: assert($('h2').eq(2).text() == "22 USD", 'The third <code>h2</code> should have the text "22 USD".');
   - text: The fourth <code>h2</code> should have the text "17 USD".
-    testString: 'assert($("h2").eq(3).text() == "17 USD", "The fourth <code>h2</code> should have the text "17 USD".");'
+    testString: assert($('h2').eq(3).text() == "17 USD", 'The fourth <code>h2</code> should have the text "17 USD".');
   - text: The fifth <code>h2</code> should have the text "25 USD".
-    testString: 'assert($("h2").eq(4).text() == "25 USD", "The fifth <code>h2</code> should have the text "25 USD".");'
+    testString: assert($('h2').eq(4).text() == "25 USD", 'The fifth <code>h2</code> should have the text "25 USD".');
   - text: The sixth <code>h2</code> should have the text "18 USD".
-    testString: 'assert($("h2").eq(5).text() == "18 USD", "The sixth <code>h2</code> should have the text "18 USD".");'
+    testString: assert($('h2').eq(5).text() == "18 USD", 'The sixth <code>h2</code> should have the text "18 USD".');
   - text: The seventh <code>h2</code> should have the text "29 USD".
-    testString: 'assert($("h2").eq(6).text() == "29 USD", "The seventh <code>h2</code> should have the text "29 USD".");'
+    testString: assert($('h2').eq(6).text() == "29 USD", 'The seventh <code>h2</code> should have the text "29 USD".');
   - text: The eighth <code>h2</code> should have the text "14 USD".
-    testString: 'assert($("h2").eq(7).text() == "14 USD", "The eighth <code>h2</code> should have the text "14 USD".");'
+    testString: assert($('h2').eq(7).text() == "14 USD", 'The eighth <code>h2</code> should have the text "14 USD".');
   - text: The ninth <code>h2</code> should have the text "9 USD".
-    testString: 'assert($("h2").eq(8).text() == "9 USD", "The ninth <code>h2</code> should have the text "9 USD".");'
+    testString: assert($('h2').eq(8).text() == "9 USD", 'The ninth <code>h2</code> should have the text "9 USD".');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/access-the-json-data-from-an-api.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/access-the-json-data-from-an-api.english.md
index 034635120d..2808590de1 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/access-the-json-data-from-an-api.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/access-the-json-data-from-an-api.english.md
@@ -28,8 +28,8 @@ For the cat with the "id" of 2, print to the console the second value in the <co
 
 ```yml
 tests:
-  - text: 'Your code should use bracket and dot notation to access the proper code name, and print "Loki" to the console.'
-    testString: 'assert(code.match(/(?:json\[2\]\.codeNames\[1\]|json\[2\]\[("|")codeNames\1\]\[1\])/g), "Your code should use bracket and dot notation to access the proper code name, and print "Loki" to the console.");'
+  - text: Your code should use bracket and dot notation to access the proper code name, and print "Loki" to the console.
+    testString: assert(code.match(/(?:json\[2\]\.codeNames\[1\]|json\[2\]\[('|")codeNames\1\]\[1\])/g), 'Your code should use bracket and dot notation to access the proper code name, and print "Loki" to the console.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/change-text-with-click-events.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/change-text-with-click-events.english.md
index 756d21b25c..a42d581814 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/change-text-with-click-events.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/change-text-with-click-events.english.md
@@ -23,7 +23,7 @@ Add code inside the <code>onclick</code> event handler to change the text inside
 ```yml
 tests:
   - text: Your code should use the <code>document.getElementsByClassName</code> method to select the element with class <code>message</code> and set its <code>textContent</code> to the given string.
-    testString: 'assert(code.match(/document\.getElementsByClassName\(\s*?("|")message\1\s*?\)\[0\]\.textContent\s*?=\s*?("|")Here is the message\2/g), "Your code should use the <code>document.getElementsByClassName</code> method to select the element with class <code>message</code> and set its <code>textContent</code> to the given string.");'
+    testString: assert(code.match(/document\.getElementsByClassName\(\s*?('|")message\1\s*?\)\[0\]\.textContent\s*?=\s*?('|")Here is the message\2/g), 'Your code should use the <code>document.getElementsByClassName</code> method to select the element with class <code>message</code> and set its <code>textContent</code> to the given string.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/convert-json-data-to-html.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/convert-json-data-to-html.english.md
index c28a848d86..218078847f 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/convert-json-data-to-html.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/convert-json-data-to-html.english.md
@@ -27,11 +27,11 @@ Here is some example JSON
 ```yml
 tests:
   - text: Your code should store the data in the <code>html</code> variable
-    testString: 'assert(code.match(/html\s+?(\+=|=\shtml\s\+)/g), "Your code should store the data in the <code>html</code> variable");'
+    testString: assert(code.match(/html\s+?(\+=|=\shtml\s\+)/g), 'Your code should store the data in the <code>html</code> variable');
   - text: Your code should use a <code>forEach</code> method to loop over the JSON data from the API.
-    testString: 'assert(code.match(/json\.forEach/g), "Your code should use a <code>forEach</code> method to loop over the JSON data from the API.");'
+    testString: assert(code.match(/json\.forEach/g), 'Your code should use a <code>forEach</code> method to loop over the JSON data from the API.');
   - text: Your code should wrap the key names in <code>strong</code> tags.
-    testString: 'assert(code.match(/<strong>.+<\/strong>/g), "Your code should wrap the key names in <code>strong</code> tags.");'
+    testString: assert(code.match(/<strong>.+<\/strong>/g), 'Your code should wrap the key names in <code>strong</code> tags.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-geolocation-data-to-find-a-users-gps-coordinates.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-geolocation-data-to-find-a-users-gps-coordinates.english.md
index 217d2b96e3..7b33b5d2e7 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-geolocation-data-to-find-a-users-gps-coordinates.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-geolocation-data-to-find-a-users-gps-coordinates.english.md
@@ -25,14 +25,14 @@ Add the example code inside the <code>script</code> tags to check a user's curre
 
 ```yml
 tests:
-  - text: 'Your code should use <code>navigator.geolocation</code> to access the user&#39;s current location.'
-    testString: 'assert(code.match(/navigator\.geolocation\.getCurrentPosition/g), "Your code should use <code>navigator.geolocation</code> to access the user&#39;s current location.");'
-  - text: 'Your code should use <code>position.coords.latitude</code> to display the user&#39;s latitudinal location.'
-    testString: 'assert(code.match(/position\.coords\.latitude/g), "Your code should use <code>position.coords.latitude</code> to display the user&#39;s latitudinal location.");'
-  - text: 'Your code should use <code>position.coords.longitude</code> to display the user&#39;s longitudinal location.'
-    testString: 'assert(code.match(/position\.coords\.longitude/g), "Your code should use <code>position.coords.longitude</code> to display the user&#39;s longitudinal location.");'
-  - text: 'You should display the user&#39;s position within the <code>data</code> div element.'
-    testString: 'assert(code.match(/document\.getElementById\(\s*?("|")data\1\s*?\)\.innerHTML/g), "You should display the user&#39;s position within the <code>data</code> div element.");'
+  - text: Your code should use <code>navigator.geolocation</code> to access the user&#39;s current location.
+    testString: assert(code.match(/navigator\.geolocation\.getCurrentPosition/g), 'Your code should use <code>navigator.geolocation</code> to access the user&#39;s current location.');
+  - text: Your code should use <code>position.coords.latitude</code> to display the user&#39;s latitudinal location.
+    testString: assert(code.match(/position\.coords\.latitude/g), 'Your code should use <code>position.coords.latitude</code> to display the user&#39;s latitudinal location.');
+  - text: Your code should use <code>position.coords.longitude</code> to display the user&#39;s longitudinal location.
+    testString: assert(code.match(/position\.coords\.longitude/g), 'Your code should use <code>position.coords.longitude</code> to display the user&#39;s longitudinal location.');
+  - text: You should display the user&#39;s position within the <code>data</code> div element.
+    testString: assert(code.match(/document\.getElementById\(\s*?('|")data\1\s*?\)\.innerHTML/g), 'You should display the user&#39;s position within the <code>data</code> div element.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-json-with-the-javascript-xmlhttprequest-method.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-json-with-the-javascript-xmlhttprequest-method.english.md
index 7ca2026d9e..20c348080b 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-json-with-the-javascript-xmlhttprequest-method.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-json-with-the-javascript-xmlhttprequest-method.english.md
@@ -30,17 +30,17 @@ Update the code to create and send a "GET" request to the freeCodeCamp Cat Photo
 ```yml
 tests:
   - text: Your code should create a new <code>XMLHttpRequest</code>.
-    testString: 'assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g), "Your code should create a new <code>XMLHttpRequest</code>.");'
+    testString: assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g), 'Your code should create a new <code>XMLHttpRequest</code>.');
   - text: Your code should use the <code>open</code> method to initialize a "GET" request to the freeCodeCamp Cat Photo API.
-    testString: 'assert(code.match(/\.open\(\s*?("|")GET\1\s*?,\s*?("|")\/json\/cats\.json\2\s*?,\s*?true\s*?\)/g), "Your code should use the <code>open</code> method to initialize a "GET" request to the freeCodeCamp Cat Photo API.");'
+    testString: assert(code.match(/\.open\(\s*?('|")GET\1\s*?,\s*?('|")\/json\/cats\.json\2\s*?,\s*?true\s*?\)/g), 'Your code should use the <code>open</code> method to initialize a "GET" request to the freeCodeCamp Cat Photo API.');
   - text: Your code should use the <code>send</code> method to send the request.
-    testString: 'assert(code.match(/\.send\(\s*\)/g), "Your code should use the <code>send</code> method to send the request.");'
+    testString: assert(code.match(/\.send\(\s*\)/g), 'Your code should use the <code>send</code> method to send the request.');
   - text: Your code should have an <code>onload</code> event handler set to a function.
-    testString: 'assert(code.match(/\.onload\s*=\s*function\(\s*?\)\s*?{/g), "Your code should have an <code>onload</code> event handler set to a function.");'
+    testString: assert(code.match(/\.onload\s*=\s*function\(\s*?\)\s*?{/g), 'Your code should have an <code>onload</code> event handler set to a function.');
   - text: Your code should use the <code>JSON.parse</code> method to parse the <code>responseText</code>.
-    testString: 'assert(code.match(/JSON\.parse\(.*\.responseText\)/g), "Your code should use the <code>JSON.parse</code> method to parse the <code>responseText</code>.");'
+    testString: assert(code.match(/JSON\.parse\(.*\.responseText\)/g), 'Your code should use the <code>JSON.parse</code> method to parse the <code>responseText</code>.');
   - text: Your code should get the element with class <code>message</code> and change its inner HTML to the string of JSON data.
-    testString: 'assert(code.match(/document\.getElementsByClassName\(\s*?("|")message\1\s*?\)\[0\]\.innerHTML\s*?=\s*?JSON\.stringify\(.+?\)/g), "Your code should get the element with class <code>message</code> and change its inner HTML to the string of JSON data.");'
+    testString: assert(code.match(/document\.getElementsByClassName\(\s*?('|")message\1\s*?\)\[0\]\.innerHTML\s*?=\s*?JSON\.stringify\(.+?\)/g), 'Your code should get the element with class <code>message</code> and change its inner HTML to the string of JSON data.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/handle-click-events-with-javascript-using-the-onclick-property.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/handle-click-events-with-javascript-using-the-onclick-property.english.md
index 4c189dedc4..8e9299e6f6 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/handle-click-events-with-javascript-using-the-onclick-property.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/handle-click-events-with-javascript-using-the-onclick-property.english.md
@@ -23,9 +23,9 @@ Add a click event handler inside of the <code>DOMContentLoaded</code> function f
 ```yml
 tests:
   - text: Your code should use the <code>document.getElementById</code> method to select the <code>getMessage</code> element.
-    testString: 'assert(code.match(/document\.getElementById\(\s*?("|")getMessage\1\s*?\)/g), "Your code should use the <code>document.getElementById</code> method to select the <code>getMessage</code> element.");'
+    testString: assert(code.match(/document\.getElementById\(\s*?('|")getMessage\1\s*?\)/g), 'Your code should use the <code>document.getElementById</code> method to select the <code>getMessage</code> element.');
   - text: Your code should add an <code>onclick</code> event handler.
-    testString: 'assert(typeof document.getElementById("getMessage").onclick === "function", "Your code should add an <code>onclick</code> event handler.");'
+    testString: assert(typeof document.getElementById('getMessage').onclick === 'function', 'Your code should add an <code>onclick</code> event handler.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.english.md
index a34b039d2d..f232f8974b 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method.english.md
@@ -26,17 +26,17 @@ Update the code to create and send a "POST" request. Then enter your name in inp
 ```yml
 tests:
   - text: Your code should create a new <code>XMLHttpRequest</code>.
-    testString: 'assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g), "Your code should create a new <code>XMLHttpRequest</code>.");'
+    testString: assert(code.match(/new\s+?XMLHttpRequest\(\s*?\)/g), 'Your code should create a new <code>XMLHttpRequest</code>.');
   - text: Your code should use the <code>open</code> method to initialize a "POST" request to the server.
-    testString: 'assert(code.match(/\.open\(\s*?("|")POST\1\s*?,\s*?url\s*?,\s*?true\s*?\)/g), "Your code should use the <code>open</code> method to initialize a "POST" request to the server.");'
+    testString: assert(code.match(/\.open\(\s*?('|")POST\1\s*?,\s*?url\s*?,\s*?true\s*?\)/g), 'Your code should use the <code>open</code> method to initialize a "POST" request to the server.');
   - text: Your code should use the <code>setRequestHeader</code> method.
-    testString: 'assert(code.match(/\.setRequestHeader\(\s*?("|")Content-Type\1\s*?,\s*?("|")text\/plain\2\s*?\)/g), "Your code should use the <code>setRequestHeader</code> method.");'
+    testString: assert(code.match(/\.setRequestHeader\(\s*?('|")Content-Type\1\s*?,\s*?('|")text\/plain\2\s*?\)/g), 'Your code should use the <code>setRequestHeader</code> method.');
   - text: Your code should have an <code>onreadystatechange</code> event handler set to a function.
-    testString: 'assert(code.match(/\.onreadystatechange\s*?=/g), "Your code should have an <code>onreadystatechange</code> event handler set to a function.");'
+    testString: assert(code.match(/\.onreadystatechange\s*?=/g), 'Your code should have an <code>onreadystatechange</code> event handler set to a function.');
   - text: Your code should get the element with class <code>message</code> and change its inner HTML to the <code>responseText</code>.
-    testString: 'assert(code.match(/document\.getElementsByClassName\(\s*?("|")message\1\s*?\)\[0\]\.innerHTML\s*?=\s*?.+?\.responseText/g), "Your code should get the element with class <code>message</code> and change its inner HTML to the <code>responseText</code>.");'
+    testString: assert(code.match(/document\.getElementsByClassName\(\s*?('|")message\1\s*?\)\[0\]\.innerHTML\s*?=\s*?.+?\.responseText/g), 'Your code should get the element with class <code>message</code> and change its inner HTML to the <code>responseText</code>.');
   - text: Your code should use the <code>send</code> method.
-    testString: 'assert(code.match(/\.send\(\s*?userName\s*?\)/g), "Your code should use the <code>send</code> method.");'
+    testString: assert(code.match(/\.send\(\s*?userName\s*?\)/g), 'Your code should use the <code>send</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/pre-filter-json-to-get-the-data-you-need.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/pre-filter-json-to-get-the-data-you-need.english.md
index 07c61768f3..9ef3ff3344 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/pre-filter-json-to-get-the-data-you-need.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/pre-filter-json-to-get-the-data-you-need.english.md
@@ -23,7 +23,7 @@ Add code to <code>filter</code> the json data to remove the cat with the "id" va
 ```yml
 tests:
   - text: Your code should use the <code>filter</code> method.
-    testString: 'assert(code.match(/json\.filter/g), "Your code should use the <code>filter</code> method.");'
+    testString: assert(code.match(/json\.filter/g), 'Your code should use the <code>filter</code> method.');
 
 ```
 
diff --git a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/render-images-from-data-sources.english.md b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/render-images-from-data-sources.english.md
index 7acf523e92..12b7f59979 100644
--- a/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/render-images-from-data-sources.english.md
+++ b/curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/render-images-from-data-sources.english.md
@@ -23,7 +23,7 @@ Add code to use the <code>imageLink</code> and <code>altText</code> properties i
 ```yml
 tests:
   - text: You should use the <code>imageLink</code> property to display the images.
-    testString: 'assert(code.match(/val\.imageLink/g), "You should use the <code>imageLink</code> property to display the images.");'
+    testString: assert(code.match(/val\.imageLink/g), 'You should use the <code>imageLink</code> property to display the images.');
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md
index 0ad2b23cd9..8e434b46e1 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/announce-new-users.english.md
@@ -33,10 +33,10 @@ Submit your page when you think you've got it right.
 
 ```yml
 tests:
-  - text: 'Event "user" is emitted with name, currentUsers, and connected'
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /io.emit.*("|")user("|").*name.*currentUsers.*connected/gi, "You should have an event emitted named user sending name, currentUsers, and connected"); }, xhr => { throw new Error(xhr.statusText); })'
+  - text: Event 'user' is emitted with name, currentUsers, and connected
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /io.emit.*('|")user('|").*name.*currentUsers.*connected/gi, 'You should have an event emitted named user sending name, currentUsers, and connected'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Client properly handling and displaying the new data from event 'user'
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/public/client.js") .then(data => { assert.match(data, /socket.on.*("|")user("|")[^]*num-users/gi, "You should change the text of #num-users within on your client within the "user" even listener to show the current users connected"); assert.match(data, /socket.on.*("|")user("|")[^]*messages.*li/gi, "You should append a list item to #messages on your client within the "user" event listener to annouce a user came or went"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/public/client.js') .then(data => { assert.match(data, /socket.on.*('|")user('|")[^]*num-users/gi, 'You should change the text of #num-users within on your client within the "user" even listener to show the current users connected'); assert.match(data, /socket.on.*('|")user('|")[^]*messages.*li/gi, 'You should append a list item to #messages on your client within the "user" event listener to annouce a user came or went'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md
index 924583b386..95ed192999 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-strategies.english.md
@@ -35,9 +35,9 @@ In the next step we will set up how to actually call the authentication strategy
 ```yml
 tests:
   - text: Passport-local is a dependency
-    testString: ' getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "passport-local", "Your project should list "passport-local " as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString:  getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'passport-local', 'Your project should list "passport-local " as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Passport-local correctly required and setup
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /require.*("|")passport-local("|")/gi, "You should have required passport-local"); assert.match(data, /new LocalStrategy/gi, "You should have told passport to use a new strategy"); assert.match(data, /findOne/gi, "Your new local strategy should use the findOne query to find a username based on the inputs"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /require.*("|')passport-local("|')/gi, 'You should have required passport-local'); assert.match(data, /new LocalStrategy/gi, 'You should have told passport to use a new strategy'); assert.match(data, /findOne/gi, 'Your new local strategy should use the findOne query to find a username based on the inputs'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md
index f47469d3b3..882237e5fa 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/authentication-with-socket.io.english.md
@@ -30,11 +30,11 @@ Submit your page when you think you've got it right. If you're running into erro
 ```yml
 tests:
   - text: passportSocketIo is a dependency
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "passport.socketio", "Your project should list "passport.socketio" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'passport.socketio', 'Your project should list "passport.socketio" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: passportSocketIo is properly required
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js").then(data => { assert.match(data, /require\(([""])passport\.socketio\1\)/gi, "You should correctly require and instantiate "passport.socketio"");}, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js').then(data => { assert.match(data, /require\((['"])passport\.socketio\1\)/gi, 'You should correctly require and instantiate "passport.socketio"');}, xhr => { throw new Error(xhr.statusText); })
   - text: passportSocketIo is properly setup
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /io\.use\(.+\.authorize\(/gi, "You should register "passport.socketio" as socket.io middleware and provide it correct options"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /io\.use\(.+\.authorize\(/gi, 'You should register "passport.socketio" as socket.io middleware and provide it correct options'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md
index 6e75f5f637..f66be2cce4 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/clean-up-your-project-with-modules.english.md
@@ -32,7 +32,7 @@ Congratulations- you're at the end of this section of Advanced Node and Express
 ```yml
 tests:
   - text: Modules present
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /require.*("|").\/routes.js("|")/gi, "You should have required your new files"); assert.match(data, /mongo.connect[^]*routes/gi, "Your new modules should be called after your connection to the database"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /require.*("|').\/routes.js("|')/gi, 'You should have required your new files'); assert.match(data, /mongo.connect[^]*routes/gi, 'Your new modules should be called after your connection to the database'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md
index 1044f5e31f..4bc91d8781 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/communicate-by-emitting.english.md
@@ -29,11 +29,11 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: currentUsers is defined
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js").then(data => {assert.match(data, /currentUsers/gi, "You should have variable currentUsers defined");}, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js').then(data => {assert.match(data, /currentUsers/gi, 'You should have variable currentUsers defined');}, xhr => { throw new Error(xhr.statusText); })
   - text: Server emits the current user count at each new connection
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /io.emit.*("|")user count("|").*currentUsers/gi, "You should emit "user count" with data currentUsers"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /io.emit.*('|")user count('|").*currentUsers/gi, 'You should emit "user count" with data currentUsers'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Your client is listening for 'user count' event
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/public/client.js") .then(data => { assert.match(data, /socket.on.*("|")user count("|")/gi, "Your client should be connection to server with the connection defined as socket"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/public/client.js') .then(data => { assert.match(data, /socket.on.*('|")user count('|")/gi, 'Your client should be connection to server with the connection defined as socket'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md
index b5f6ea648f..205aa5efa2 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/create-new-middleware.english.md
@@ -34,9 +34,9 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Middleware ensureAuthenticated should be implemented and on our /profile route
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /ensureAuthenticated[^]*req.isAuthenticated/gi, "Your ensureAuthenticated middleware should be defined and utilize the req.isAuthenticated function"); assert.match(data, /profile[^]*get[^]*ensureAuthenticated/gi, "Your ensureAuthenticated middleware should be attached to the /profile route"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /ensureAuthenticated[^]*req.isAuthenticated/gi, 'Your ensureAuthenticated middleware should be defined and utilize the req.isAuthenticated function'); assert.match(data, /profile[^]*get[^]*ensureAuthenticated/gi, 'Your ensureAuthenticated middleware should be attached to the /profile route'); }, xhr => { throw new Error(xhr.statusText); })
   - text: A Get request to /profile correctly redirects to / since we are not authenticated
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/profile") .then(data => { assert.match(data, /Home page/gi, "An attempt to go to the profile at this point should redirect to the homepage since we are not logged in"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/profile') .then(data => { assert.match(data, /Home page/gi, 'An attempt to go to the profile at this point should redirect to the homepage since we are not logged in'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md
index 6a76628418..899f321d72 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/handle-a-disconnect.english.md
@@ -25,9 +25,9 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Server handles the event disconnect from a socket
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /socket.on.*("|")disconnect("|")/gi, ""); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /socket.on.*('|")disconnect('|")/gi, ''); }, xhr => { throw new Error(xhr.statusText); })
   - text: Your client is listening for 'user count' event
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/public/client.js") .then(data => { assert.match(data, /socket.on.*("|")user count("|")/gi, "Your client should be connection to server with the connection defined as socket"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/public/client.js') .then(data => { assert.match(data, /socket.on.*('|")user count('|")/gi, 'Your client should be connection to server with the connection defined as socket'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md
index 11f893e4b6..c059640837 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/hashing-your-passwords.english.md
@@ -25,9 +25,9 @@ That is all it takes to implement one of the most important security features wh
 ```yml
 tests:
   - text: BCrypt is a dependency
-    testString: ' getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "bcrypt", "Your project should list "bcrypt" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString:  getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'bcrypt', 'Your project should list "bcrypt" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: BCrypt correctly required and implemented
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /require.*("|")bcrypt("|")/gi, "You should have required bcrypt"); assert.match(data, /bcrypt.hashSync/gi, "You should use hash the password in the registration"); assert.match(data, /bcrypt.compareSync/gi, "You should compare the password to the hash in your strategy"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /require.*("|')bcrypt("|')/gi, 'You should have required bcrypt'); assert.match(data, /bcrypt.hashSync/gi, 'You should use hash the password in the registration'); assert.match(data, /bcrypt.compareSync/gi, 'You should compare the password to the hash in your strategy'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md
index 4341c035e6..474fa0f6b9 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-put-a-profile-together.english.md
@@ -24,7 +24,7 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Correctly added a Pug render variable to /profile
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /\/views\/pug\/profile[^]*username:( |)req.user.username/gi, "You should be passing the variable username with req.user.username into the render function of the profile page"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /\/views\/pug\/profile[^]*username:( |)req.user.username/gi, 'You should be passing the variable username with req.user.username into the render function of the profile page'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md
index 11bd05692b..908395dcb8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/how-to-use-passport-strategies.english.md
@@ -26,9 +26,9 @@ Submit your page when you think you've got it right. If you're running into erro
 ```yml
 tests:
   - text: All steps correctly implemented in the server.js
-    testString: ' getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /showLogin:( |)true/gi, "You should be passing the variable "showLogin" as true to your render function for the homepage"); assert.match(data, /failureRedirect:( |)("|")\/("|")/gi, "Your code should include a failureRedirect to the "/" route"); assert.match(data, /login[^]*post[^]*local/gi, "You should have a route for login which accepts a POST and passport.authenticates local"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString:  getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /showLogin:( |)true/gi, 'You should be passing the variable "showLogin" as true to your render function for the homepage'); assert.match(data, /failureRedirect:( |)('|")\/('|")/gi, 'Your code should include a failureRedirect to the "/" route'); assert.match(data, /login[^]*post[^]*local/gi, 'You should have a route for login which accepts a POST and passport.authenticates local'); }, xhr => { throw new Error(xhr.statusText); })
   - text: A POST request to /login correctly redirects to /
-    testString: 'getUserInput => $.post(getUserInput("url")+ "/login") .then(data => { assert.match(data, /Looks like this page is being rendered from Pug into HTML!/gi, "A login attempt at this point should redirect to the homepage since we do not have any registered users"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.post(getUserInput('url')+ '/login') .then(data => { assert.match(data, /Looks like this page is being rendered from Pug into HTML!/gi, 'A login attempt at this point should redirect to the homepage since we do not have any registered users'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md
index dbee9d7379..532015d601 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implement-the-serialization-of-a-passport-user.english.md
@@ -34,9 +34,9 @@ Submit your page when you think you've got it right. If you're running into erro
 ```yml
 tests:
   - text: Database connection is present
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /mongo.connect/gi, "You should have created a connection to your database"); assert.match(data, /mongo.connect[^]*app.listen[^]*}[^]*}/gi, "You should have your app.listen nested at within your database connection at the bottom"); }, xhr => { throw new Error(xhr.statusText); })'
-  - text: 'Deserialization is now correctly using the DB and <code>done(null, null)</code> is erased'
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.notMatch(data, /null,( |)null/gi, "The callback in deserializeUser of (null, null) should be completely removed for the db block uncommented out"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /mongo.connect/gi, 'You should have created a connection to your database'); assert.match(data, /mongo.connect[^]*app.listen[^]*}[^]*}/gi, 'You should have your app.listen nested at within your database connection at the bottom'); }, xhr => { throw new Error(xhr.statusText); })
+  - text: Deserialization is now correctly using the DB and <code>done(null, null)</code> is erased
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.notMatch(data, /null,( |)null/gi, 'The callback in deserializeUser of (null, null) should be completely removed for the db block uncommented out'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md
index c839d7e95d..ab9bf3e2e1 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-ii.english.md
@@ -34,11 +34,11 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Dependency added
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "passport-github", "Your project should list "passport-github" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'passport-github', 'Your project should list "passport-github" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Dependency required
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /require.*("|")passport-github("|")/gi, "You should have required passport-github"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /require.*("|')passport-github("|')/gi, 'You should have required passport-github'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Github strategy setup correctly thus far
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /passport.use.*new GitHubStrategy/gi, "Passport should use a new GitHubStrategy"); assert.match(data, /callbackURL:( |)("|").*("|")/gi, "You should have a callbackURL"); assert.match(data, /process.env.GITHUB_CLIENT_SECRET/g, "You should use process.env.GITHUB_CLIENT_SECRET"); assert.match(data, /process.env.GITHUB_CLIENT_ID/g, "You should use process.env.GITHUB_CLIENT_ID"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /passport.use.*new GitHubStrategy/gi, 'Passport should use a new GitHubStrategy'); assert.match(data, /callbackURL:( |)("|').*("|')/gi, 'You should have a callbackURL'); assert.match(data, /process.env.GITHUB_CLIENT_SECRET/g, 'You should use process.env.GITHUB_CLIENT_SECRET'); assert.match(data, /process.env.GITHUB_CLIENT_ID/g, 'You should use process.env.GITHUB_CLIENT_ID'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md
index 0c24a01729..af53b22710 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication-iii.english.md
@@ -14,10 +14,10 @@ The final part of the strategy is handling the profile returned from Github. We
     {$setOnInsert:{
         id: profile.id,
         name: profile.displayName || 'John Doe',
-        photo: profile.photos[0].value || ",
+        photo: profile.photos[0].value || '',
         email: profile.emails[0].value || 'No public email',
         created_on: new Date(),
-        provider: profile.provider || "
+        provider: profile.provider || ''
     },$set:{
         last_login: new Date()
     },$inc:{
@@ -43,7 +43,7 @@ You should be able to login to your app now- try it! Submit your page when you t
 ```yml
 tests:
   - text: Github strategy setup complete
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /GitHubStrategy[^]*db.collection/gi, "Strategy should use now use the database to search for the user"); assert.match(data, /GitHubStrategy[^]*socialusers/gi, "Strategy should use "socialusers" as db collection"); assert.match(data, /GitHubStrategy[^]*return cb/gi, "Strategy should return the callback function "cb""); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /GitHubStrategy[^]*db.collection/gi, 'Strategy should use now use the database to search for the user'); assert.match(data, /GitHubStrategy[^]*socialusers/gi, 'Strategy should use "socialusers" as db collection'); assert.match(data, /GitHubStrategy[^]*return cb/gi, 'Strategy should return the callback function "cb"'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md
index acadd0e3da..f76687bd7d 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/implementation-of-social-authentication.english.md
@@ -29,9 +29,9 @@ Submit your page when you think you've got it right. If you're running into erro
 ```yml
 tests:
   - text: Route /auth/github correct
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /("|")\/auth\/github("|")[^]*get.*passport.authenticate.*github/gi, "Route auth/github should only call passport.authenticate with github"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /('|")\/auth\/github('|")[^]*get.*passport.authenticate.*github/gi, 'Route auth/github should only call passport.authenticate with github'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Route /auth/github/callback correct
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /("|")\/auth\/github\/callback("|")[^]*get.*passport.authenticate.*github.*failureRedirect:( |)("|")\/("|")/gi, "Route auth/github/callback should accept a get request and call passport.authenticate for github with a failure redirect to home"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /('|")\/auth\/github\/callback('|")[^]*get.*passport.authenticate.*github.*failureRedirect:( |)("|')\/("|')/gi, 'Route auth/github/callback should accept a get request and call passport.authenticate for github with a failure redirect to home'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md
index c78cbc1533..9010a2eb2e 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/logging-a-user-out.english.md
@@ -34,9 +34,9 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Logout route
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /req.logout/gi, "You should be call req.logout() in youre /logout route"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /req.logout/gi, 'You should be call req.logout() in youre /logout route'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Logout should redirect to the home page /
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/logout") .then(data => { assert.match(data, /Home page/gi, "When a user logs out they should be redirected to the homepage"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/logout') .then(data => { assert.match(data, /Home page/gi, 'When a user logs out they should be redirected to the homepage'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md
index 87f6211219..df765161bf 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/registration-of-new-users.english.md
@@ -50,15 +50,15 @@ Submit your page when you think you've got it right. If you're running into erro
 ```yml
 tests:
   - text: Register route and display on home
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /showRegistration:( |)true/gi, "You should be passing the variable "showRegistration" as true to your render function for the homepage"); assert.match(data, /register[^]*post[^]*findOne[^]*username:( |)req.body.username/gi, "You should have a route accepted a post request on register that querys the db with findone and the query being "username: req.body.username""); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: 'getUserInput => $.get(getUserInput(''url'')+ ''/_api/server.js'') .then(data => { assert.match(data, /showRegistration:( |)true/gi, ''You should be passing the variable "showRegistration" as true to your render function for the homepage''); assert.match(data, /register[^]*post[^]*findOne[^]*username:( |)req.body.username/gi, ''You should have a route accepted a post request on register that querys the db with findone and the query being "username: req.body.username"''); }, xhr => { throw new Error(xhr.statusText); })'
   - text: Registering should work
-    testString: 'getUserInput => $.ajax({url: getUserInput("url")+ "/register",data: {username: "freeCodeCampTester", password: "freeCodeCampTester"},crossDomain: true, type: "POST", xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Profile/gi, "I should be able to register and it direct me to my profile. CLEAR YOUR DATABASE if this test fails (each time until its right!)"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: 'getUserInput => $.ajax({url: getUserInput(''url'')+ ''/register'',data: {username: ''freeCodeCampTester'', password: ''freeCodeCampTester''},crossDomain: true, type: ''POST'', xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Profile/gi, ''I should be able to register and it direct me to my profile. CLEAR YOUR DATABASE if this test fails (each time until its right!)''); }, xhr => { throw new Error(xhr.statusText); })'
   - text: Login should work
-    testString: 'getUserInput => $.ajax({url: getUserInput("url")+ "/login",data: {username: "freeCodeCampTester", password: "freeCodeCampTester"}, type: "POST", xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Profile/gi, "Login should work if previous test was done successfully and redirect successfully to the profile. Check your work and clear your DB"); assert.match(data, /freeCodeCampTester/gi, "The profile should properly display the welcome to the user logged in"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: 'getUserInput => $.ajax({url: getUserInput(''url'')+ ''/login'',data: {username: ''freeCodeCampTester'', password: ''freeCodeCampTester''}, type: ''POST'', xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Profile/gi, ''Login should work if previous test was done successfully and redirect successfully to the profile. Check your work and clear your DB''); assert.match(data, /freeCodeCampTester/gi, ''The profile should properly display the welcome to the user logged in''); }, xhr => { throw new Error(xhr.statusText); })'
   - text: Logout should work
-    testString: 'getUserInput => $.ajax({url: getUserInput("url")+ "/logout", type: "GET", xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Home/gi, "Logout should redirect to home"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: 'getUserInput => $.ajax({url: getUserInput(''url'')+ ''/logout'', type: ''GET'', xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Home/gi, ''Logout should redirect to home''); }, xhr => { throw new Error(xhr.statusText); })'
   - text: Profile should no longer work after logout
-    testString: 'getUserInput => $.ajax({url: getUserInput("url")+ "/profile", type: "GET", crossDomain: true, xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Home/gi, "Profile should redirect to home when we are logged out now again"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: 'getUserInput => $.ajax({url: getUserInput(''url'')+ ''/profile'', type: ''GET'', crossDomain: true, xhrFields: { withCredentials: true }}) .then(data => { assert.match(data, /Home/gi, ''Profile should redirect to home when we are logged out now again''); }, xhr => { throw new Error(xhr.statusText); })'
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md
index 2593af1892..f23017b443 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/send-and-display-chat-messages.english.md
@@ -25,9 +25,9 @@ At this point the chat should be fully functional and sending messages across al
 ```yml
 tests:
   - text: Server listens for 'chat message' then emits it properly
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /socket.on.*("|")chat message("|")[^]*io.emit.*("|")chat message("|").*name.*message/gi, "Your server should listen to the socket for "chat message" then emit to all users "chat message" with name and message in the data object"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /socket.on.*('|")chat message('|")[^]*io.emit.*('|")chat message('|").*name.*message/gi, 'Your server should listen to the socket for "chat message" then emit to all users "chat message" with name and message in the data object'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Client properly handling and displaying the new data from event 'chat message'
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/public/client.js") .then(data => { assert.match(data, /socket.on.*("|")chat message("|")[^]*messages.*li/gi, "You should append a list item to #messages on your client within the "chat message" event listener to display the new message"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/public/client.js') .then(data => { assert.match(data, /socket.on.*('|")chat message('|")[^]*messages.*li/gi, 'You should append a list item to #messages on your client within the "chat message" event listener to display the new message'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md
index 7346062464..9764ce0386 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/serialization-of-a-user-object.english.md
@@ -35,13 +35,13 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Serialize user function correct
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /passport.serializeUser/gi, "You should have created your passport.serializeUser function"); assert.match(data, /null, user._id/gi, "There should be a callback in your serializeUser with (null, user._id)"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /passport.serializeUser/gi, 'You should have created your passport.serializeUser function'); assert.match(data, /null, user._id/gi, 'There should be a callback in your serializeUser with (null, user._id)'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Deserialize user function correct
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /passport.deserializeUser/gi, "You should have created your passport.deserializeUser function"); assert.match(data, /null,( |)null/gi, "There should be a callback in your deserializeUser with (null, null) for now"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /passport.deserializeUser/gi, 'You should have created your passport.deserializeUser function'); assert.match(data, /null,( |)null/gi, 'There should be a callback in your deserializeUser with (null, null) for now'); }, xhr => { throw new Error(xhr.statusText); })
   - text: MongoDB is a dependency
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "mongodb", "Your project should list "mongodb" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'mongodb', 'Your project should list "mongodb" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Mongodb properly required including the ObjectId
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /require.*("|")mongodb("|")/gi, "You should have required mongodb"); assert.match(data, /new ObjectID.*id/gi, "Even though the block is commented out, you should use new ObjectID(id) for when we add the database"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /require.*("|')mongodb("|')/gi, 'You should have required mongodb'); assert.match(data, /new ObjectID.*id/gi, 'Even though the block is commented out, you should use new ObjectID(id) for when we add the database'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md
index 6d7a524a6a..183a16d52f 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-a-template-engine.english.md
@@ -25,11 +25,11 @@ If all went as planned, you should refresh your apps home page and see a small m
 ```yml
 tests:
   - text: Pug is a dependency
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "pug", "Your project should list "pug" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'pug', 'Your project should list "pug" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: View engine is Pug
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /("|")view engine("|"),( |)("|")pug("|")/gi, "Your project should set Pug as a view engine"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /('|")view engine('|"),( |)('|")pug('|")/gi, 'Your project should set Pug as a view engine'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Pug is working
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/") .then(data => { assert.match(data, /pug-success-message/gi, "Your projects home page should now be rendered by pug with the projects .pug file unaltered"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/') .then(data => { assert.match(data, /pug-success-message/gi, 'Your projects home page should now be rendered by pug with the projects .pug file unaltered'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md
index fe82a287ba..b6bc153fd8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-passport.english.md
@@ -32,13 +32,13 @@ Submit your page when you think you've got it right. If you're running into erro
 ```yml
 tests:
   - text: Passort and Express-session are dependencies
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "passport", "Your project should list "passport" as a dependency"); assert.property(packJson.dependencies, "express-session", "Your project should list "express-session" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'passport', 'Your project should list "passport" as a dependency'); assert.property(packJson.dependencies, 'express-session', 'Your project should list "express-session" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Dependencies correctly required
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /require.*("|")passport("|")/gi, "You should have required passport"); assert.match(data, /require.*("|")express-session("|")/gi, "You should have required express-session"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /require.*("|')passport("|')/gi, 'You should have required passport'); assert.match(data, /require.*("|')express-session("|')/gi, 'You should have required express-session'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Express app uses new dependencies
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /passport.initialize/gi, "Your express app should use "passport.initialize()""); assert.match(data, /passport.session/gi, "Your express app should use "passport.session()""); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /passport.initialize/gi, 'Your express app should use "passport.initialize()"'); assert.match(data, /passport.session/gi, 'Your express app should use "passport.session()"'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Session and session secret correctly set up
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /secret:( |)process.env.SESSION_SECRET/gi, "Your express app should have express-session set up with your secret as process.env.SESSION_SECRET"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /secret:( |)process.env.SESSION_SECRET/gi, 'Your express app should have express-session set up with your secret as process.env.SESSION_SECRET'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md
index 68d33390ee..3bb762e261 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/set-up-the-environment.english.md
@@ -30,13 +30,13 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Socket.IO is a dependency
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "socket.io", "Your project should list "socket.io" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'socket.io', 'Your project should list "socket.io" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Socket.IO has been properly required and instanciated
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js").then(data => {assert.match(data, /io.*=.*require.*("|")socket.io("|").*http/gi, "You should correctly require and instantiate socket.io as io.");}, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js').then(data => {assert.match(data, /io.*=.*require.*('|")socket.io('|").*http/gi, 'You should correctly require and instantiate socket.io as io.');}, xhr => { throw new Error(xhr.statusText); })
   - text: Socket.IO should be listening for connections
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /io.on.*("|")connection("|").*socket/gi, "io should listen for "connection" and socket should be the 2nd arguments variable"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /io.on.*('|")connection('|").*socket/gi, 'io should listen for "connection" and socket should be the 2nd arguments variable'); }, xhr => { throw new Error(xhr.statusText); })
   - text: Your client should connect to your server
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/public/client.js") .then(data => { assert.match(data, /socket.*=.*io/gi, "Your client should be connection to server with the connection defined as socket"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/public/client.js') .then(data => { assert.match(data, /socket.*=.*io/gi, 'Your client should be connection to server with the connection defined as socket'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md
index 3fee4c4d4a..1b0a887f82 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/advanced-node-and-express/use-a-template-engines-powers.english.md
@@ -27,7 +27,7 @@ Now refresh your page and you should see those values rendered in your view in t
 ```yml
 tests:
   - text: Pug render variables correct
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/") .then(data => { assert.match(data, /pug-variable("|")>Please login/gi, "Your projects home page should now be rendered by pug with the projects .pug file unaltered"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/') .then(data => { assert.match(data, /pug-variable("|')>Please login/gi, 'Your projects home page should now be rendered by pug with the projects .pug file unaltered'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md
index 749556b737..2a43ae4b50 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/anonymous-message-board.english.md
@@ -28,21 +28,21 @@ tests:
     testString: ''
   - text: Only allow your site to send the referrer for your own pages.
     testString: ''
-  - text: 'I can POST a thread to a specific message board by passing form data text and deletepassword_ to /api/threads/{board}.(Recommend res.redirect to board page /b/{board}) Saved will be at least _id, text, createdon_(date&time), bumpedon_(date&time, starts same as created_on), reported(boolean), deletepassword_, & replies(array).'
+  - text: I can POST a thread to a specific message board by passing form data text and deletepassword_ to /api/threads/{board}.(Recommend res.redirect to board page /b/{board}) Saved will be at least _id, text, createdon_(date&time), bumpedon_(date&time, starts same as created_on), reported(boolean), deletepassword_, & replies(array).
     testString: ''
-  - text: 'I can POST a reply to a thread on a specific board by passing form data text, deletepassword_, & threadid_ to /api/replies/{board} and it will also update the bumped_on date to the comments date.(Recommend res.redirect to thread page /b/{board}/{thread_id}) In the thread"s replies array will be saved _id, text, createdon_, deletepassword_, & reported.'
+  - text: I can POST a reply to a thread on a specific board by passing form data text, deletepassword_, & threadid_ to /api/replies/{board} and it will also update the bumped_on date to the comments date.(Recommend res.redirect to thread page /b/{board}/{thread_id}) In the thread's replies array will be saved _id, text, createdon_, deletepassword_, & reported.
     testString: ''
-  - text: 'I can GET an array of the most recent 10 bumped threads on the board with only the most recent 3 replies each from /api/threads/{board}. The reported and deletepasswords_ fields will not be sent to the client.'
+  - text: I can GET an array of the most recent 10 bumped threads on the board with only the most recent 3 replies each from /api/threads/{board}. The reported and deletepasswords_ fields will not be sent to the client.
     testString: ''
-  - text: 'I can GET an entire thread with all its replies from /api/replies/{board}?thread_id={thread_id}. Also hiding the same fields the client should be see.'
+  - text: I can GET an entire thread with all its replies from /api/replies/{board}?thread_id={thread_id}. Also hiding the same fields the client should be see.
     testString: ''
-  - text: 'I can delete a thread completely if I send a DELETE request to /api/threads/{board} and pass along the threadid_ & deletepassword_. (Text response will be "incorrect password" or "success")'
+  - text: I can delete a thread completely if I send a DELETE request to /api/threads/{board} and pass along the threadid_ & deletepassword_. (Text response will be 'incorrect password' or 'success')
     testString: ''
-  - text: 'I can delete a post(just changing the text to "[deleted]" instead of removing completely like a thread) if I send a DELETE request to /api/replies/{board} and pass along the threadid_, replyid_, & deletepassword_. (Text response will be "incorrect password" or "success")'
+  - text: I can delete a post(just changing the text to '[deleted]' instead of removing completely like a thread) if I send a DELETE request to /api/replies/{board} and pass along the threadid_, replyid_, & deletepassword_. (Text response will be 'incorrect password' or 'success')
     testString: ''
-  - text: 'I can report a thread and change its reported value to true by sending a PUT request to /api/threads/{board} and pass along the threadid_. (Text response will be "success")'
+  - text: I can report a thread and change its reported value to true by sending a PUT request to /api/threads/{board} and pass along the threadid_. (Text response will be 'success')
     testString: ''
-  - text: 'I can report a reply and change its reported value to true by sending a PUT request to /api/replies/{board} and pass along the threadid_ & replyid_. (Text response will be "success")'
+  - text: I can report a reply and change its reported value to true by sending a PUT request to /api/replies/{board} and pass along the threadid_ & replyid_. (Text response will be 'success')
     testString: ''
   - text: Complete functional tests that wholly test routes and pass.
     testString: ''
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md
index 8d8aa822ac..9c3bb38253 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/issue-tracker.english.md
@@ -24,17 +24,17 @@ Start this project on Glitch using <a href='https://glitch.com/#!/import/github/
 tests:
   - text: Prevent cross site scripting (XSS) attacks.
     testString: ''
-  - text: 'I can POST /api/issues/{projectname} with form data containing required issue_title, issue_text, created_by, and optional assigned_to and status_text.'
+  - text: I can POST /api/issues/{projectname} with form data containing required issue_title, issue_text, created_by, and optional assigned_to and status_text.
     testString: ''
-  - text: 'The object saved (and returned) will include all of those fields (blank for optional no input) and also include created_on(date/time), updated_on(date/time), open(boolean, true for open, false for closed), and _id.'
+  - text: The object saved (and returned) will include all of those fields (blank for optional no input) and also include created_on(date/time), updated_on(date/time), open(boolean, true for open, false for closed), and _id.
     testString: ''
-  - text: 'I can PUT /api/issues/{projectname} with a id and any fields in the object with a value to object said object. Returned will be "successfully updated" or "could not update "+id. This should always update updated_on. If no fields are sent return "no updated field sent".'
+  - text: I can PUT /api/issues/{projectname} with a id and any fields in the object with a value to object said object. Returned will be 'successfully updated' or 'could not update '+id. This should always update updated_on. If no fields are sent return 'no updated field sent'.
     testString: ''
-  - text: 'I can DELETE /api/issues/{projectname} with a id to completely delete an issue. If no _id is sent return "id error", success: "deleted "+id, failed: "could not delete "+id.'
+  - text: 'I can DELETE /api/issues/{projectname} with a id to completely delete an issue. If no _id is sent return ''id error'', success: ''deleted ''+id, failed: ''could not delete ''+id.'
     testString: ''
-  - text: 'I can GET /api/issues/{projectname} for an array of all issues on that specific project with all the information for each issue as was returned when posted.'
+  - text: I can GET /api/issues/{projectname} for an array of all issues on that specific project with all the information for each issue as was returned when posted.
     testString: ''
-  - text: 'I can filter my get request by also passing along any field and value in the query(ie. /api/issues/{project}?open=false). I can pass along as many fields/values as I want.'
+  - text: I can filter my get request by also passing along any field and value in the query(ie. /api/issues/{project}?open=false). I can pass along as many fields/values as I want.
     testString: ''
   - text: All 11 functional tests are complete and passing.
     testString: ''
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md
index 15b8cfc187..58ceff0d0a 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/metric-imperial-converter.english.md
@@ -34,15 +34,15 @@ tests:
     testString: ''
   - text: I can convert 'mi' to 'km' and vice versa. (1 mi to 1.60934 km)
     testString: ''
-  - text: 'If my unit of measurement is invalid, returned will be "invalid unit".'
+  - text: If my unit of measurement is invalid, returned will be 'invalid unit'.
     testString: ''
-  - text: 'If my number is invalid, returned with will "invalid number".'
+  - text: If my number is invalid, returned with will 'invalid number'.
     testString: ''
-  - text: 'If both are invalid, return will be "invalid number and unit".'
+  - text: If both are invalid, return will be 'invalid number and unit'.
     testString: ''
-  - text: 'I can use fractions, decimals or both in my parameter(ie. 5, 1/2, 2.5/6), but if nothing is provided it will default to 1.'
+  - text: I can use fractions, decimals or both in my parameter(ie. 5, 1/2, 2.5/6), but if nothing is provided it will default to 1.
     testString: ''
-  - text: 'My return will consist of the initNum, initUnit, returnNum, returnUnit, and string spelling out units in format "{initNum} {initial_Units} converts to {returnNum} {return_Units}" with the result rounded to 5 decimals in the string.'
+  - text: My return will consist of the initNum, initUnit, returnNum, returnUnit, and string spelling out units in format '{initNum} {initial_Units} converts to {returnNum} {return_Units}' with the result rounded to 5 decimals in the string.
     testString: ''
   - text: All 16 unit tests are complete and passing.
     testString: ''
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md
index 56cc7bfb57..bcb140e6ba 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/personal-library.english.md
@@ -28,13 +28,13 @@ tests:
     testString: ''
   - text: I can post a title to /api/books to add a book and returned will be the object with the title and a unique _id.
     testString: ''
-  - text: 'I can get /api/books to retrieve an array of all books containing title, _id, and commentcount.'
+  - text: I can get /api/books to retrieve an array of all books containing title, _id, and commentcount.
     testString: ''
-  - text: 'I can get /api/books/{id} to retrieve a single object of a book containing _title, _id, & an array of comments (empty array if no comments present).'
+  - text: I can get /api/books/{id} to retrieve a single object of a book containing _title, _id, & an array of comments (empty array if no comments present).
     testString: ''
-  - text: 'I can post a comment to /api/books/{id} to add a comment to a book and returned will be the books object similar to get /api/books/{id} including the new comment.'
+  - text: I can post a comment to /api/books/{id} to add a comment to a book and returned will be the books object similar to get /api/books/{id} including the new comment.
     testString: ''
-  - text: 'I can delete /api/books/{_id} to delete a book from the collection. Returned will be "delete successful" if successful.'
+  - text: I can delete /api/books/{_id} to delete a book from the collection. Returned will be 'delete successful' if successful.
     testString: ''
   - text: If I try to request a book that doesn't exist I will be returned 'no book exists'.
     testString: ''
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md
index 1c75566ad8..52c1059b21 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-and-quality-assurance-projects/stock-price-checker.english.md
@@ -26,13 +26,13 @@ tests:
     testString: ''
   - text: I can GET /api/stock-prices with form data containing a Nasdaq stock ticker and receive back an object stockData.
     testString: ''
-  - text: 'In stockData, I can see the stock(string, the ticker), price(decimal in string format), and likes(int).'
+  - text: In stockData, I can see the stock(string, the ticker), price(decimal in string format), and likes(int).
     testString: ''
   - text: I can also pass along field like as true(boolean) to have my like added to the stock(s). Only 1 like per ip should be accepted.
     testString: ''
-  - text: 'If I pass along 2 stocks, the return object will be an array with both stock"s info. Instead of likes, it will display rel_likes(the difference between the likes on both stocks) on both.'
+  - text: If I pass along 2 stocks, the return object will be an array with both stock's info. Instead of likes, it will display rel_likes(the difference between the likes on both stocks) on both.
     testString: ''
-  - text: 'A good way to receive current price is the following external API(replacing "GOOG" with your stock): https://finance.google.com/finance/info?q=NASDAQ%3aGOOG'
+  - text: 'A good way to receive current price is the following external API(replacing ''GOOG'' with your stock): https://finance.google.com/finance/info?q=NASDAQ%3aGOOG'
     testString: ''
   - text: All 5 functional tests are complete and passing.
     testString: ''
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md
index b8afe598c0..bcba43fcde 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/ask-browsers-to-access-your-site-via-https-only-with-helmet.hsts.english.md
@@ -23,9 +23,9 @@ Note: Configuring HTTPS on a custom website requires the acquisition of a domain
 ```yml
 tests:
   - text: helmet.hsts() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "hsts"); assert.property(data.headers, "strict-transport-security"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'hsts'); assert.property(data.headers, 'strict-transport-security'); }, xhr => { throw new Error(xhr.responseText); })
   - text: maxAge should be equal to 7776000 ms (90 days)
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.match(data.headers["strict-transport-security"], /^max-age=777600000;?/); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.match(data.headers['strict-transport-security'], /^max-age=777600000;?/); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md
index d004b97c26..333ebd795a 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/avoid-inferring-the-response-mime-type-with-helmet.nosniff.english.md
@@ -21,7 +21,7 @@ Browsers can use content or MIME sniffing to adapt to different datatypes coming
 ```yml
 tests:
   - text: helmet.noSniff() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "nosniff"); assert.equal(data.headers["x-content-type-options"], "nosniff"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'nosniff'); assert.equal(data.headers['x-content-type-options'], 'nosniff'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md
index 7fab1b1785..d5612d2a8d 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.english.md
@@ -21,7 +21,7 @@ If you are releasing an update for your website, and you want the users to alway
 ```yml
 tests:
   - text: helmet.noCache() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "nocache"); assert.equal(data.headers["cache-control"], "no-store, no-cache, must-revalidate, proxy-revalidate"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'nocache'); assert.equal(data.headers['cache-control'], 'no-store, no-cache, must-revalidate, proxy-revalidate'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md
index 03c6627124..906170b649 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/disable-dns-prefetching-with-helmet.dnsprefetchcontrol.english.md
@@ -21,7 +21,7 @@ To improve performance, most browsers prefetch DNS records for the links in a pa
 ```yml
 tests:
   - text: helmet.dnsPrefetchControl() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "dnsPrefetchControl"); assert.equal(data.headers["x-dns-prefetch-control"], "off"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'dnsPrefetchControl'); assert.equal(data.headers['x-dns-prefetch-control'], 'off'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md
index f0da866583..152e75cab7 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-asynchronously.english.md
@@ -30,7 +30,7 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: Async hash generated and correctly compared
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /START_ASYNC[^]*bcrypt.hash.*myPlaintextPassword( |),( |)saltRounds( |),( |).*err( |),( |)hash[^]*END_ASYNC/gi, "You should call bcrypt.hash on myPlaintextPassword and saltRounds and handle err and hash as a result in the callback"); assert.match(data, /START_ASYNC[^]*bcrypt.hash[^]*bcrypt.compare.*myPlaintextPassword( |),( |)hash( |),( |).*err( |),( |)res[^]*}[^]*}[^]*END_ASYNC/gi, "Nested within the hash function should be the compare function comparing myPlaintextPassword to hash"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /START_ASYNC[^]*bcrypt.hash.*myPlaintextPassword( |),( |)saltRounds( |),( |).*err( |),( |)hash[^]*END_ASYNC/gi, 'You should call bcrypt.hash on myPlaintextPassword and saltRounds and handle err and hash as a result in the callback'); assert.match(data, /START_ASYNC[^]*bcrypt.hash[^]*bcrypt.compare.*myPlaintextPassword( |),( |)hash( |),( |).*err( |),( |)res[^]*}[^]*}[^]*END_ASYNC/gi, 'Nested within the hash function should be the compare function comparing myPlaintextPassword to hash'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md
index ff2908992c..0a4ea6f101 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hash-and-compare-passwords-synchronously.english.md
@@ -24,7 +24,7 @@ Submit your page when you think you've got it right. If you ran into errors duri
 ```yml
 tests:
   - text: Sync hash generated and correctly compared
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js") .then(data => { assert.match(data, /START_SYNC[^]*hash.*=.*bcrypt.hashSync.*myPlaintextPassword( |),( |)saltRounds[^]*END_SYNC/gi, "You should call bcrypt.hashSync on myPlaintextPassword with saltRounds"); assert.match(data, /START_SYNC[^]*result.*=.*bcrypt.compareSync.*myPlaintextPassword( |),( |)hash[^]*END_SYNC/gi, "You should call bcrypt.compareSync on myPlaintextPassword with the hash generated in the last line"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js') .then(data => { assert.match(data, /START_SYNC[^]*hash.*=.*bcrypt.hashSync.*myPlaintextPassword( |),( |)saltRounds[^]*END_SYNC/gi, 'You should call bcrypt.hashSync on myPlaintextPassword with saltRounds'); assert.match(data, /START_SYNC[^]*result.*=.*bcrypt.compareSync.*myPlaintextPassword( |),( |)hash[^]*END_SYNC/gi, 'You should call bcrypt.compareSync on myPlaintextPassword with the hash generated in the last line'); }, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md
index b5f54bec67..eed35828d8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.english.md
@@ -21,7 +21,7 @@ Hackers can exploit known vulnerabilities in Express/Node if they see that your
 ```yml
 tests:
   - text: helmet.hidePoweredBy() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "hidePoweredBy"); assert.notEqual(data.headers["x-powered-by"], "Express")}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'hidePoweredBy'); assert.notEqual(data.headers['x-powered-by'], 'Express')}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md
index 4e9ccc60b1..2fada32457 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/install-and-require-helmet.english.md
@@ -21,7 +21,7 @@ Helmet helps you secure your Express apps by setting various HTTP headers. Insta
 ```yml
 tests:
   - text: '"helmet" dependency should be in package.json'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/package.json").then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "helmet"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/package.json').then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'helmet'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md
index 362138ee9b..89bf952ba8 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-clickjacking-with-helmet.frameguard.english.md
@@ -22,9 +22,9 @@ We don’t need our app to be framed. You should use <code>helmet.frameguard()</
 ```yml
 tests:
   - text: helmet.frameguard() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "frameguard", "helmet.frameguard() middleware is not mounted correctly"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'frameguard', 'helmet.frameguard() middleware is not mounted correctly'); }, xhr => { throw new Error(xhr.responseText); })
   - text: helmet.frameguard() 'action' should be set to 'DENY'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.property(data.headers, "x-frame-options"); assert.equal(data.headers["x-frame-options"], "DENY");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.property(data.headers, 'x-frame-options'); assert.equal(data.headers['x-frame-options'], 'DENY');}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md
index f1c7b600e8..c90b253dba 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/mitigate-the-risk-of-cross-site-scripting-xss-attacks-with-helmet.xssfilter.english.md
@@ -25,7 +25,7 @@ It still has limited support.
 ```yml
 tests:
   - text: helmet.xssFilter() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "xXssProtection"); assert.property(data.headers, "x-xss-protection"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'xXssProtection'); assert.property(data.headers, 'x-xss-protection'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md
index 8369bd5b53..eff742c378 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/prevent-ie-from-opening-untrusted-html-with-helmet.ienoopen.english.md
@@ -21,7 +21,7 @@ Some web applications will serve untrusted HTML for download. Some versions of I
 ```yml
 tests:
   - text: helmet.ieNoOpen() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "ienoopen"); assert.equal(data.headers["x-download-options"], "noopen"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'ienoopen'); assert.equal(data.headers['x-download-options'], 'noopen'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md
index e1a57230b8..347fa9584b 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/set-a-content-security-policy-with-helmet.contentsecuritypolicy.english.md
@@ -23,9 +23,9 @@ Hint: in the "'self'" keyword, the single quotes are part of the keyword itself,
 ```yml
 tests:
   - text: helmet.csp() middleware should be mounted correctly
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "csp"); }, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'Your csp config is not correct. defaultSrc should be [""self""] and scriptSrc should be [""self"", "trusted-cdn.com"]'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { var cspHeader = Object.keys(data.headers).filter(function(k){ return k === "content-security-policy" || k === "x-webkit-csp" || k === "x-content-security-policy" })[0]; assert.equal(data.headers[cspHeader], "default-src "self"; script-src "self" trusted-cdn.com"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'csp'); }, xhr => { throw new Error(xhr.responseText); })
+  - text: Your csp config is not correct. defaultSrc should be ["'self'"] and scriptSrc should be ["'self'", 'trusted-cdn.com']
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { var cspHeader = Object.keys(data.headers).filter(function(k){ return k === 'content-security-policy' || k === 'x-webkit-csp' || k === 'x-content-security-policy' })[0]; assert.equal(data.headers[cspHeader], "default-src 'self'; script-src 'self' trusted-cdn.com"); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md
index afcf6398e5..d7060c7290 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/information-security-with-helmetjs/understand-bcrypt-hashes.english.md
@@ -24,9 +24,9 @@ Submit your page when you think you've got it right.
 ```yml
 tests:
   - text: BCyrpt is a dependency
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/package.json") .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, "bcrypt", "Your project should list "bcrypt" as a dependency"); }, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/package.json') .then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, 'bcrypt', 'Your project should list "bcrypt" as a dependency'); }, xhr => { throw new Error(xhr.statusText); })
   - text: BCrypt has been properly required
-    testString: 'getUserInput => $.get(getUserInput("url")+ "/_api/server.js").then(data => {assert.match(data, /bcrypt.*=.*require.*("|")bcrypt("|")/gi, "You should correctly require and instantiate socket.io as io.");}, xhr => { throw new Error(xhr.statusText); })'
+    testString: getUserInput => $.get(getUserInput('url')+ '/_api/server.js').then(data => {assert.match(data, /bcrypt.*=.*require.*('|")bcrypt('|")/gi, 'You should correctly require and instantiate socket.io as io.');}, xhr => { throw new Error(xhr.statusText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md
index 0ab874ed53..91bac46fac 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/assert-deep-equality-with-.deepequal-and-.notdeepequal.english.md
@@ -22,11 +22,11 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=6").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=6').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - deepEqual vs. notDeepEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=6").then(data => {  assert.equal(data.assertions[0].method, "deepEqual", "The order of the keys does not matter"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=6').then(data => {  assert.equal(data.assertions[0].method, 'deepEqual', 'The order of the keys does not matter'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - deepEqual vs. notDeepEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=6").then(data => {  assert.equal(data.assertions[1].method, "notDeepEqual", "The position of elements within an array does matter"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=6').then(data => {  assert.equal(data.assertions[1].method, 'notDeepEqual', 'The position of elements within an array does matter'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md
index b424780a56..6a896dc285 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/compare-the-properties-of-two-elements.english.md
@@ -21,15 +21,15 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=7").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=7').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isAbove vs. isAtMost
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=7").then(data => {  assert.equal(data.assertions[0].method, "isAtMost", "5 is at most (<=) 5"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=7').then(data => {  assert.equal(data.assertions[0].method, 'isAtMost', '5 is at most (<=) 5'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isAbove vs. isAtMost
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=7").then(data => {  assert.equal(data.assertions[1].method, "isAbove", "1 is greater than 0"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=7').then(data => {  assert.equal(data.assertions[1].method, 'isAbove', '1 is greater than 0'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isAbove vs. isAtMost
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=7").then(data => {  assert.equal(data.assertions[2].method, "isAbove", "Math.PI = 3.14159265 is greater than 3"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=7').then(data => {  assert.equal(data.assertions[2].method, 'isAbove', 'Math.PI = 3.14159265 is greater than 3'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isAbove vs. isAtMost
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=7").then(data => {  assert.equal(data.assertions[3].method, "isAtMost", "1 - Math.random() is > 0 and <= 1. It is atMost 1 !"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=7').then(data => {  assert.equal(data.assertions[3].method, 'isAtMost', '1 - Math.random() is > 0 and <= 1. It is atMost 1 !'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md
index 611b4063da..75ce6930d5 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/learn-how-javascript-assertions-work.english.md
@@ -21,11 +21,11 @@ Use assert.isNull() or assert.isNotNull() to make the tests pass.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=0").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isNull vs. isNotNull
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=0").then(data => {  assert.equal(data.assertions[0].method, "isNull", "Null is null"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(data => {  assert.equal(data.assertions[0].method, 'isNull', 'Null is null'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isNull vs. isNotNull
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=0").then(data => {  assert.equal(data.assertions[1].method, "isNotNull", "1 is not null"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=0').then(data => {  assert.equal(data.assertions[1].method, 'isNotNull', '1 is not null'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md
index 55cb3bc675..c072bbaccd 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iii---put-method.english.md
@@ -30,15 +30,15 @@ Follow the assertion order above, We rely on it.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=2").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=2').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.status' to be 200
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=2").then(data => { assert.equal(data.assertions[0].method, "equal"); assert.equal(data.assertions[0].args[0], "res.status"); assert.equal(data.assertions[0].args[1], "200");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=2').then(data => { assert.equal(data.assertions[0].method, 'equal'); assert.equal(data.assertions[0].args[0], 'res.status'); assert.equal(data.assertions[0].args[1], '200');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.type' to be 'application/json'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=2").then(data => { assert.equal(data.assertions[1].method, "equal"); assert.equal(data.assertions[1].args[0], "res.type"); assert.equal(data.assertions[1].args[1], "\"application/json\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=2').then(data => { assert.equal(data.assertions[1].method, 'equal'); assert.equal(data.assertions[1].args[0], 'res.type'); assert.equal(data.assertions[1].args[1], '\'application/json\'');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.body.name' to be 'Cristoforo'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=2").then(data => { assert.equal(data.assertions[2].method, "equal"); assert.equal(data.assertions[2].args[0], "res.body.name"); assert.equal(data.assertions[2].args[1], "\"Cristoforo\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=2').then(data => { assert.equal(data.assertions[2].method, 'equal'); assert.equal(data.assertions[2].args[0], 'res.body.name'); assert.equal(data.assertions[2].args[1], '\'Cristoforo\'');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.body.surname' to be 'Colombo'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=2").then(data => { assert.equal(data.assertions[3].method, "equal"); assert.equal(data.assertions[3].args[0], "res.body.surname"); assert.equal(data.assertions[3].args[1], "\"Colombo\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=2').then(data => { assert.equal(data.assertions[3].method, 'equal'); assert.equal(data.assertions[3].args[0], 'res.body.surname'); assert.equal(data.assertions[3].args[1], '\'Colombo\'');}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md
index 60942fc3f3..1a45c74087 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-an-api-response-using-chai-http-iv---put-method.english.md
@@ -24,15 +24,15 @@ Follow the assertion order above, We rely on it.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=3").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=3').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.status' to be 200
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=3").then(data => { assert.equal(data.assertions[0].method, "equal"); assert.equal(data.assertions[0].args[0], "res.status"); assert.equal(data.assertions[0].args[1], "200");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=3').then(data => { assert.equal(data.assertions[0].method, 'equal'); assert.equal(data.assertions[0].args[0], 'res.status'); assert.equal(data.assertions[0].args[1], '200');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.type' to be 'application/json'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=3").then(data => { assert.equal(data.assertions[1].method, "equal"); assert.equal(data.assertions[1].args[0], "res.type"); assert.equal(data.assertions[1].args[1], "\"application/json\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=3').then(data => { assert.equal(data.assertions[1].method, 'equal'); assert.equal(data.assertions[1].args[0], 'res.type'); assert.equal(data.assertions[1].args[1], '\'application/json\'');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.body.name' to be 'Giovanni'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=3").then(data => { assert.equal(data.assertions[2].method, "equal"); assert.equal(data.assertions[2].args[0], "res.body.name"); assert.equal(data.assertions[2].args[1], "\"Giovanni\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=3').then(data => { assert.equal(data.assertions[2].method, 'equal'); assert.equal(data.assertions[2].args[0], 'res.body.name'); assert.equal(data.assertions[2].args[1], '\'Giovanni\'');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.body.surname' to be 'da Verrazzano'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=3").then(data => { assert.equal(data.assertions[3].method, "equal"); assert.equal(data.assertions[3].args[0], "res.body.surname"); assert.equal(data.assertions[3].args[1], "\"da Verrazzano\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=3').then(data => { assert.equal(data.assertions[3].method, 'equal'); assert.equal(data.assertions[3].args[0], 'res.body.surname'); assert.equal(data.assertions[3].args[1], '\'da Verrazzano\'');}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md
index 3efdb1da55..33157d3bee 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http-ii.english.md
@@ -22,11 +22,11 @@ Send you name in the query appending ?name=<your_name>, the endpoint with respon
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=1").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=1').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.status' == 200
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=1").then(data => { assert.equal(data.assertions[0].method, "equal"); assert.equal(data.assertions[0].args[0], "res.status"); assert.equal(data.assertions[0].args[1], "200");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=1').then(data => { assert.equal(data.assertions[0].method, 'equal'); assert.equal(data.assertions[0].args[0], 'res.status'); assert.equal(data.assertions[0].args[1], '200');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.text' == 'hello Guest'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=1").then(data => { assert.equal(data.assertions[1].method, "equal"); assert.equal(data.assertions[1].args[0], "res.text"); assert.match(data.assertions[1].args[1], /hello [\w\d_-]/);}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=1').then(data => { assert.equal(data.assertions[1].method, 'equal'); assert.equal(data.assertions[1].args[0], 'res.text'); assert.match(data.assertions[1].args[1], /hello [\w\d_-]/);}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md
index df63f8bc26..87301ecd62 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-on-api-endpoints-using-chai-http.english.md
@@ -22,11 +22,11 @@ Don't send a name in the query, the endpoint with responds with 'hello Guest'.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=0").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=0').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.status' == 200
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=0").then(data => { assert.equal(data.assertions[0].method, "equal"); assert.equal(data.assertions[0].args[0], "res.status"); assert.equal(data.assertions[0].args[1], "200");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=0').then(data => { assert.equal(data.assertions[0].method, 'equal'); assert.equal(data.assertions[0].args[0], 'res.status'); assert.equal(data.assertions[0].args[1], '200');}, xhr => { throw new Error(xhr.responseText); })
   - text: You should test for 'res.text' == 'hello Guest'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=0").then(data => { assert.equal(data.assertions[1].method, "equal"); assert.equal(data.assertions[1].args[0], "res.text"); assert.equal(data.assertions[1].args[1], "\"hello Guest\"");}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=0').then(data => { assert.equal(data.assertions[1].method, 'equal'); assert.equal(data.assertions[1].args[0], 'res.text'); assert.equal(data.assertions[1].args[1], '\'hello Guest\'');}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md
index 0a55d40623..ac94d5c220 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser-ii.english.md
@@ -22,15 +22,15 @@ Look at  the code for directions. Follow the assertions order, We rely on it.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=5").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
-  - text: ' assert that the headless browser request succeeded'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=5").then(data => { assert.equal(data.assertions[0].method, "browser.success"); }, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'assert that the text inside the element "span#name" is "Amerigo"'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=5").then(data => { assert.equal(data.assertions[1].method, "browser.text"); assert.equal(data.assertions[1].args[0], "\"span#name\""); assert.equal(data.assertions[1].args[1], "\"Amerigo\"");}, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'assert that the text inside the element "span#surname" is "Vespucci"'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=5").then(data => { assert.equal(data.assertions[2].method, "browser.text"); assert.equal(data.assertions[2].args[0], "\"span#surname\""); assert.equal(data.assertions[2].args[1], "\"Vespucci\"");}, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'assert that the element "span#dates" exist and its count is 1'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=5").then(data => { assert.equal(data.assertions[3].method, "browser.element"); assert.equal(data.assertions[3].args[0], "\"span#dates\""); assert.equal(data.assertions[3].args[1], 1);}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=5').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
+  - text:  assert that the headless browser request succeeded
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=5').then(data => { assert.equal(data.assertions[0].method, 'browser.success'); }, xhr => { throw new Error(xhr.responseText); })
+  - text: assert that the text inside the element 'span#name' is 'Amerigo'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=5').then(data => { assert.equal(data.assertions[1].method, 'browser.text'); assert.equal(data.assertions[1].args[0], '\'span#name\''); assert.equal(data.assertions[1].args[1], '\'Amerigo\'');}, xhr => { throw new Error(xhr.responseText); })
+  - text: assert that the text inside the element 'span#surname' is 'Vespucci'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=5').then(data => { assert.equal(data.assertions[2].method, 'browser.text'); assert.equal(data.assertions[2].args[0], '\'span#surname\''); assert.equal(data.assertions[2].args[1], '\'Vespucci\'');}, xhr => { throw new Error(xhr.responseText); })
+  - text: assert that the element 'span#dates' exist and its count is 1
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=5').then(data => { assert.equal(data.assertions[3].method, 'browser.element'); assert.equal(data.assertions[3].args[0], '\'span#dates\''); assert.equal(data.assertions[3].args[1], 1);}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md
index 32c345dbdd..1959ce2513 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/run-functional-tests-using-a-headless-browser.english.md
@@ -24,15 +24,15 @@ Look at the examples in the code for the exercise directions Follow the assertio
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=4").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=4').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: assert that the headless browser request succeeded
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=4").then(data => { assert.equal(data.assertions[0].method, "browser.success"); }, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'assert that the text inside the element "span#name" is "Cristoforo"'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=4").then(data => { assert.equal(data.assertions[1].method, "browser.text"); assert.equal(data.assertions[1].args[0], "\"span#name\""); assert.equal(data.assertions[1].args[1], "\"Cristoforo\"");}, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'assert that the text inside the element "span#surname" is "Colombo"'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=4").then(data => { assert.equal(data.assertions[2].method, "browser.text"); assert.equal(data.assertions[2].args[0], "\"span#surname\""); assert.equal(data.assertions[2].args[1], "\"Colombo\"");}, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'assert that the element "span#dates" exist and its count is 1'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=functional&n=4").then(data => { assert.equal(data.assertions[3].method, "browser.element"); assert.equal(data.assertions[3].args[0], "\"span#dates\""); assert.equal(data.assertions[3].args[1], 1);}, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=4').then(data => { assert.equal(data.assertions[0].method, 'browser.success'); }, xhr => { throw new Error(xhr.responseText); })
+  - text: assert that the text inside the element 'span#name' is 'Cristoforo'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=4').then(data => { assert.equal(data.assertions[1].method, 'browser.text'); assert.equal(data.assertions[1].args[0], '\'span#name\''); assert.equal(data.assertions[1].args[1], '\'Cristoforo\'');}, xhr => { throw new Error(xhr.responseText); })
+  - text: assert that the text inside the element 'span#surname' is 'Colombo'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=4').then(data => { assert.equal(data.assertions[2].method, 'browser.text'); assert.equal(data.assertions[2].args[0], '\'span#surname\''); assert.equal(data.assertions[2].args[1], '\'Colombo\'');}, xhr => { throw new Error(xhr.responseText); })
+  - text: assert that the element 'span#dates' exist and its count is 1
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=functional&n=4').then(data => { assert.equal(data.assertions[3].method, 'browser.element'); assert.equal(data.assertions[3].args[0], '\'span#dates\''); assert.equal(data.assertions[3].args[1], 1);}, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md
index fca04e169c..c6fddca831 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-for-truthiness.english.md
@@ -23,13 +23,13 @@ Use assert.isTrue() or assert.isNotTrue() to make the tests pass.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=3").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isTrue vs. isNotTrue
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=3").then(data => {  assert.equal(data.assertions[0].method, "isTrue", "True is true"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(data => {  assert.equal(data.assertions[0].method, 'isTrue', 'True is true'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isTrue vs. isNotTrue
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=3").then(data => {  assert.equal(data.assertions[1].method, "isTrue", "Double negation of a truthy value is true"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(data => {  assert.equal(data.assertions[1].method, 'isTrue', 'Double negation of a truthy value is true'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isTrue vs. isNotTrue
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=3").then(data => {  assert.equal(data.assertions[2].method, "isNotTrue", "A truthy object is not true - neither is a false one"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=3').then(data => {  assert.equal(data.assertions[2].method, 'isNotTrue', 'A truthy object is not true - neither is a false one'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md
index d4ac586fc8..43c0988814 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-string-contains-a-substring.english.md
@@ -22,11 +22,11 @@ It asserts that the actual string contains the expected substring
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=13").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=13').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - include vs. notInclude
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=13").then(data => {  assert.equal(data.assertions[0].method, "include", "\"Arrow\" contains \"row\"..."); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=13').then(data => {  assert.equal(data.assertions[0].method, 'include', '\'Arrow\' contains \'row\'...'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - include vs. notInclude
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=13").then(data => {  assert.equal(data.assertions[1].method, "notInclude", "... a \"dart\" doesn\"t contain a \"queue\""); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=13').then(data => {  assert.equal(data.assertions[1].method, 'notInclude', '... a \'dart\' doesn\'t contain a \'queue\''); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md
index 65cbf49510..11df2fcda9 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-falls-within-a-specific-range.english.md
@@ -25,11 +25,11 @@ it should be less than 1
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=9").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'Use approximately(actual, expected, range) - Chose the correct range'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=9").then(data => {  assert.equal(data.assertions[0].method, "approximately");  assert.equal(data.assertions[0].args[2], 0.5, "weirdNumbers(0.5) is in the range (0.5, 1.5]. It\"s within 1 +/- 0.5"); }, xhr => { throw new Error(xhr.responseText); })'
-  - text: 'Use approximately(actual, expected, range) - Chose the correct range'
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=9").then(data => {  assert.equal(data.assertions[1].method, "approximately");  assert.equal(data.assertions[1].args[2], 0.8, "weirdNumbers(0.2) is in the range (0.2, 1.2]. It\"s within 1 +/- 0.8"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
+  - text: Use approximately(actual, expected, range) - Chose the correct range
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(data => {  assert.equal(data.assertions[0].method, 'approximately');  assert.equal(data.assertions[0].args[2], 0.5, 'weirdNumbers(0.5) is in the range (0.5, 1.5]. It\'s within 1 +/- 0.5'); }, xhr => { throw new Error(xhr.responseText); })
+  - text: Use approximately(actual, expected, range) - Chose the correct range
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=9').then(data => {  assert.equal(data.assertions[1].method, 'approximately');  assert.equal(data.assertions[1].args[2], 0.8, 'weirdNumbers(0.2) is in the range (0.2, 1.2]. It\'s within 1 +/- 0.8'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md
index 54490b3961..31b72b8bee 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-a-string.english.md
@@ -21,13 +21,13 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=12").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isString vs. isNotString
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=12").then(data => {  assert.equal(data.assertions[0].method, "isNotString", "A float number is not a string"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(data => {  assert.equal(data.assertions[0].method, 'isNotString', 'A float number is not a string'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isString vs. isNotString
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=12").then(data => {  assert.equal(data.assertions[1].method, "isString", "environment vars are strings (or undefined)"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(data => {  assert.equal(data.assertions[1].method, 'isString', 'environment vars are strings (or undefined)'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isString vs. isNotString
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=12").then(data => {  assert.equal(data.assertions[2].method, "isString", "A JSON is a string"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=12').then(data => {  assert.equal(data.assertions[2].method, 'isString', 'A JSON is a string'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md
index 2b477d91dd..4413e0799f 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-an-array.english.md
@@ -20,11 +20,11 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=10").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=10').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isArray vs. isNotArray
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=10").then(data => {  assert.equal(data.assertions[0].method, "isArray", "String.prototype.split() returns an Array"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=10').then(data => {  assert.equal(data.assertions[0].method, 'isArray', 'String.prototype.split() returns an Array'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isArray vs. isNotArray
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=10").then(data => {  assert.equal(data.assertions[1].method, "isNotArray", "Array.prototype.indexOf() returns a number"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=10').then(data => {  assert.equal(data.assertions[1].method, 'isNotArray', 'Array.prototype.indexOf() returns a number'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md
index 25417a7f10..73288a07e2 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-value-is-of-a-specific-data-structure-type.english.md
@@ -22,17 +22,17 @@ Use #typeOf or #notTypeOf where appropriate
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=16").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=16').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - typeOf vs. notTypeOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=16").then(data => { assert.equal(data.assertions[0].method, "typeOf", "myCar is typeOf Object"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=16').then(data => { assert.equal(data.assertions[0].method, 'typeOf', 'myCar is typeOf Object'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - typeOf vs. notTypeOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=16").then(data => { assert.equal(data.assertions[1].method, "typeOf", "Car.model is a String"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=16').then(data => { assert.equal(data.assertions[1].method, 'typeOf', 'Car.model is a String'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - typeOf vs. notTypeOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=16").then(data => { assert.equal(data.assertions[2].method, "notTypeOf", "Plane.wings is a Number (not a String)"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=16').then(data => { assert.equal(data.assertions[2].method, 'notTypeOf', 'Plane.wings is a Number (not a String)'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - typeOf vs. notTypeOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=16").then(data => { assert.equal(data.assertions[3].method, "typeOf", "Plane.engines is an Array"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=16').then(data => { assert.equal(data.assertions[3].method, 'typeOf', 'Plane.engines is an Array'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - typeOf vs. notTypeOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=16").then(data => { assert.equal(data.assertions[4].method, "typeOf", "Car.wheels is a Number"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=16').then(data => { assert.equal(data.assertions[4].method, 'typeOf', 'Car.wheels is a Number'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md
index 51c4d3b3aa..d61615b710 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-a-variable-or-function-is-defined.english.md
@@ -21,13 +21,13 @@ Use assert.isDefined() or assert.isUndefined() to make the tests pass
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=1").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isDefined vs. isUndefined
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=1").then(data => {  assert.equal(data.assertions[0].method, "isDefined", "Null is not undefined"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {  assert.equal(data.assertions[0].method, 'isDefined', 'Null is not undefined'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isDefined vs. isUndefined
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=1").then(data => {  assert.equal(data.assertions[1].method, "isUndefined", "Undefined is undefined"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {  assert.equal(data.assertions[1].method, 'isUndefined', 'Undefined is undefined'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isDefined vs. isUndefined
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=1").then(data => {  assert.equal(data.assertions[2].method, "isDefined", "A string is not undefined"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=1').then(data => {  assert.equal(data.assertions[2].method, 'isDefined', 'A string is not undefined'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md
index 7a56623306..215e99f3e0 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-array-contains-an-item.english.md
@@ -20,11 +20,11 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=11").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=11').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - include vs. notInclude
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=11").then(data => {  assert.equal(data.assertions[0].method, "notInclude", "It\"s summer in july..."); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=11').then(data => {  assert.equal(data.assertions[0].method, 'notInclude', 'It\'s summer in july...'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - include vs. notInclude
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=11").then(data => {  assert.equal(data.assertions[1].method, "include", "JavaScript is a backend language !!"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=11').then(data => {  assert.equal(data.assertions[1].method, 'include', 'JavaScript is a backend language !!'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md
index 89f662bca4..9c300aeb97 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-has-a-property.english.md
@@ -22,13 +22,13 @@ Use #property or #notProperty where appropriate
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=15").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - property vs. notProperty
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=15").then(data => { assert.equal(data.assertions[0].method, "notProperty", "A car has not wings"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(data => { assert.equal(data.assertions[0].method, 'notProperty', 'A car has not wings'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - property vs. notProperty
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=15").then(data => { assert.equal(data.assertions[1].method, "property", "planes have engines"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(data => { assert.equal(data.assertions[1].method, 'property', 'planes have engines'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - property vs. notProperty
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=15").then(data => { assert.equal(data.assertions[2].method, "property", "Cars have wheels"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=15').then(data => { assert.equal(data.assertions[2].method, 'property', 'Cars have wheels'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md
index a2f8f4cf7a..e7c5ade19a 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor.english.md
@@ -22,15 +22,15 @@ Use #instanceOf or #notInstanceOf where appropriate
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=17").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - instanceOf vs. notInstanceOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=17").then(data => { assert.equal(data.assertions[0].method, "notInstanceOf", "myCar is not an instance of Plane"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(data => { assert.equal(data.assertions[0].method, 'notInstanceOf', 'myCar is not an instance of Plane'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - instanceOf vs. notInstanceOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=17").then(data => { assert.equal(data.assertions[1].method, "instanceOf", "airlinePlane is an instance of Plane"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(data => { assert.equal(data.assertions[1].method, 'instanceOf', 'airlinePlane is an instance of Plane'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - instanceOf vs. notInstanceOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=17").then(data => { assert.equal(data.assertions[2].method, "instanceOf", "everything is an Object in JavaScript..."); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(data => { assert.equal(data.assertions[2].method, 'instanceOf', 'everything is an Object in JavaScript...'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - instanceOf vs. notInstanceOf
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=17").then(data => { assert.equal(data.assertions[3].method, "notInstanceOf", "myCar.wheels is not an instance of String"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(data => { assert.equal(data.assertions[3].method, 'notInstanceOf', 'myCar.wheels is not an instance of String'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md
index ccaad37ebd..744d37c498 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/test-if-one-value-is-below-or-at-least-as-large-as-another.english.md
@@ -21,15 +21,15 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=8").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=8').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isBelow vs. isAtLeast
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=8").then(data => {  assert.equal(data.assertions[0].method, "isAtLeast", "5 is at least (>=) 5"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=8').then(data => {  assert.equal(data.assertions[0].method, 'isAtLeast', '5 is at least (>=) 5'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isBelow vs. isAtLeast
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=8").then(data => {  assert.equal(data.assertions[1].method, "isAtLeast", "2 * Math.random() is at least 0"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=8').then(data => {  assert.equal(data.assertions[1].method, 'isAtLeast', '2 * Math.random() is at least 0'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isBelow vs. isAtLeast
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=8").then(data => {  assert.equal(data.assertions[2].method, "isBelow", "1 is smaller than 2"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=8').then(data => {  assert.equal(data.assertions[2].method, 'isBelow', '1 is smaller than 2'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isBelow vs. isAtLeast
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=8").then(data => {  assert.equal(data.assertions[3].method, "isBelow", "2/3 (0.6666) is smaller than 1"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=8').then(data => {  assert.equal(data.assertions[3].method, 'isBelow', '2/3 (0.6666) is smaller than 1'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md
index 0454ce87b4..fcfd590670 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-assert.isok-and-assert.isnotok.english.md
@@ -22,13 +22,13 @@ Use assert.isOk() or assert.isNotOk() to make the tests pass.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=2").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isOk vs. isNotOk
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=2").then(data => {  assert.equal(data.assertions[0].method, "isNotOk", "Null is falsey"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => {  assert.equal(data.assertions[0].method, 'isNotOk', 'Null is falsey'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isOk vs. isNotOk
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=2").then(data => {  assert.equal(data.assertions[1].method, "isOk","A string is truthy"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => {  assert.equal(data.assertions[1].method, 'isOk','A string is truthy'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - isOk vs. isNotOk
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=2").then(data => {  assert.equal(data.assertions[2].method, "isOk", "true is truthy"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=2').then(data => {  assert.equal(data.assertions[2].method, 'isOk', 'true is truthy'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md
index 88ab1e8baa..971fe1c5c5 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-regular-expressions-to-test-a-string.english.md
@@ -22,11 +22,11 @@ matches the second argument regular expression.
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=14").then(data => { assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=14').then(data => { assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - match vs. notMatch
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=14").then(data => {  assert.equal(data.assertions[0].method, "match", "\"# name: John Doe, age: 35\" matches the regex"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: 'getUserInput => $.get(getUserInput(''url'') + ''/_api/get-tests?type=unit&n=14'').then(data => {  assert.equal(data.assertions[0].method, ''match'', ''\''# name: John Doe, age: 35\'' matches the regex''); }, xhr => { throw new Error(xhr.responseText); })'
   - text: Choose the right assertion - match vs. notMatch
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=14").then(data => {  assert.equal(data.assertions[1].method, "notMatch", "\"# name: Paul Smith III, age: twenty-four\" does not match the regex (the age must be numeric)"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: 'getUserInput => $.get(getUserInput(''url'') + ''/_api/get-tests?type=unit&n=14'').then(data => {  assert.equal(data.assertions[1].method, ''notMatch'', ''\''# name: Paul Smith III, age: twenty-four\'' does not match the regex (the age must be numeric)''); }, xhr => { throw new Error(xhr.responseText); })'
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md
index ec39146030..a10ec0071c 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-double-equals-to-assert-equality.english.md
@@ -22,15 +22,15 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=4").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=4').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - equal vs. notEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=4").then(data => {  assert.equal(data.assertions[0].method, "equal", "Numbers are coerced into strings with == "); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=4').then(data => {  assert.equal(data.assertions[0].method, 'equal', 'Numbers are coerced into strings with == '); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - equal vs. notEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=4").then(data => {  assert.equal(data.assertions[1].method, "notEqual", " == compares object references"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=4').then(data => {  assert.equal(data.assertions[1].method, 'notEqual', ' == compares object references'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - equal vs. notEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=4").then(data => {  assert.equal(data.assertions[2].method, "equal", "6 * \"2\" is 12 ! It should be equal to \"12\""); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=4').then(data => {  assert.equal(data.assertions[2].method, 'equal', '6 * \'2\' is 12 ! It should be equal to \'12\''); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - equal vs. notEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=4").then(data => {  assert.equal(data.assertions[3].method, "notEqual", "6 + \"2\" is \"62\"..."); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=4').then(data => {  assert.equal(data.assertions[3].method, 'notEqual', '6 + \'2\' is \'62\'...'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md
index ca48cbdf26..9624de94a6 100644
--- a/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md
+++ b/curriculum/challenges/english/06-information-security-and-quality-assurance/quality-assurance-and-testing-with-chai/use-the-triple-equals-to-assert-strict-equality.english.md
@@ -22,15 +22,15 @@ As a reminder, this project is being built upon the following starter project on
 ```yml
 tests:
   - text: All tests should pass
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=5").then(data => {assert.equal(data.state,"passed"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=5').then(data => {assert.equal(data.state,'passed'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - strictEqual vs. notStrictEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=5").then(data => {  assert.equal(data.assertions[0].method, "notStrictEqual", "with strictEqual the type must match"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=5').then(data => {  assert.equal(data.assertions[0].method, 'notStrictEqual', 'with strictEqual the type must match'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - strictEqual vs. notStrictEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=5").then(data => {  assert.equal(data.assertions[1].method, "strictEqual", "3*2 = 6..."); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=5').then(data => {  assert.equal(data.assertions[1].method, 'strictEqual', '3*2 = 6...'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - strictEqual vs. notStrictEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=5").then(data => {  assert.equal(data.assertions[2].method, "strictEqual", "6 * \"2\" is 12. Types match !"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=5').then(data => {  assert.equal(data.assertions[2].method, 'strictEqual', '6 * \'2\' is 12. Types match !'); }, xhr => { throw new Error(xhr.responseText); })
   - text: Choose the right assertion - strictEqual vs. notStrictEqual
-    testString: 'getUserInput => $.get(getUserInput("url") + "/_api/get-tests?type=unit&n=5").then(data => {  assert.equal(data.assertions[3].method, "notStrictEqual", "Even if they have the same elements, the Arrays are notStrictEqual"); }, xhr => { throw new Error(xhr.responseText); })'
+    testString: getUserInput => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=5').then(data => {  assert.equal(data.assertions[3].method, 'notStrictEqual', 'Even if they have the same elements, the Arrays are notStrictEqual'); }, xhr => { throw new Error(xhr.responseText); })
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/find-the-symmetric-difference.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/find-the-symmetric-difference.english.md
index feb416b80b..577d042600 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/find-the-symmetric-difference.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/find-the-symmetric-difference.english.md
@@ -21,34 +21,34 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>sym([1, 2, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.'
-    testString: 'assert.sameMembers(sym([1, 2, 3], [5, 2, 1, 4]), [3, 4, 5], "<code>sym([1, 2, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.");'
-  - text: '<code>sym([1, 2, 3], [5, 2, 1, 4])</code> should contain only three elements.'
-    testString: 'assert.equal(sym([1, 2, 3], [5, 2, 1, 4]).length, 3, "<code>sym([1, 2, 3], [5, 2, 1, 4])</code> should contain only three elements.");'
-  - text: '<code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.'
-    testString: 'assert.sameMembers(sym([1, 2, 3, 3], [5, 2, 1, 4]), [3, 4, 5], "<code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.");'
-  - text: '<code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should contain only three elements.'
-    testString: 'assert.equal(sym([1, 2, 3, 3], [5, 2, 1, 4]).length, 3, "<code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should contain only three elements.");'
-  - text: '<code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should return <code>[3, 4, 5]</code>.'
-    testString: 'assert.sameMembers(sym([1, 2, 3], [5, 2, 1, 4, 5]), [3, 4, 5], "<code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should return <code>[3, 4, 5]</code>.");'
-  - text: '<code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should contain only three elements.'
-    testString: 'assert.equal(sym([1, 2, 3], [5, 2, 1, 4, 5]).length, 3, "<code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should contain only three elements.");'
-  - text: '<code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should return <code>[1, 4, 5]</code>'
-    testString: 'assert.sameMembers(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]), [1, 4, 5], "<code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should return <code>[1, 4, 5]</code>");'
-  - text: '<code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should contain only three elements.'
-    testString: 'assert.equal(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]).length, 3, "<code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should contain only three elements.");'
-  - text: '<code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should return <code>[1, 4, 5]</code>.'
-    testString: 'assert.sameMembers(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]), [1, 4, 5], "<code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should return <code>[1, 4, 5]</code>.");'
-  - text: '<code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should contain only three elements.'
-    testString: 'assert.equal(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]).length, 3, "<code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should contain only three elements.");'
-  - text: '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should return <code>[2, 3, 4, 6, 7]</code>.'
-    testString: 'assert.sameMembers(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3]), [2, 3, 4, 6, 7], "<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should return <code>[2, 3, 4, 6, 7]</code>.");'
-  - text: '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should contain only five elements.'
-    testString: 'assert.equal(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3]).length, 5, "<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should contain only five elements.");'
-  - text: '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should return <code>[1, 2, 4, 5, 6, 7, 8, 9]</code>.'
-    testString: 'assert.sameMembers(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1]), [1, 2, 4, 5, 6, 7, 8, 9], "<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should return <code>[1, 2, 4, 5, 6, 7, 8, 9]</code>.");'
-  - text: '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should contain only eight elements.'
-    testString: 'assert.equal(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1]).length, 8, "<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should contain only eight elements.");'
+  - text: <code>sym([1, 2, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.
+    testString: assert.sameMembers(sym([1, 2, 3], [5, 2, 1, 4]), [3, 4, 5], '<code>sym([1, 2, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.');
+  - text: <code>sym([1, 2, 3], [5, 2, 1, 4])</code> should contain only three elements.
+    testString: assert.equal(sym([1, 2, 3], [5, 2, 1, 4]).length, 3, '<code>sym([1, 2, 3], [5, 2, 1, 4])</code> should contain only three elements.');
+  - text: <code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.
+    testString: assert.sameMembers(sym([1, 2, 3, 3], [5, 2, 1, 4]), [3, 4, 5], '<code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should return <code>[3, 4, 5]</code>.');
+  - text: <code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should contain only three elements.
+    testString: assert.equal(sym([1, 2, 3, 3], [5, 2, 1, 4]).length, 3, '<code>sym([1, 2, 3, 3], [5, 2, 1, 4])</code> should contain only three elements.');
+  - text: <code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should return <code>[3, 4, 5]</code>.
+    testString: assert.sameMembers(sym([1, 2, 3], [5, 2, 1, 4, 5]), [3, 4, 5], '<code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should return <code>[3, 4, 5]</code>.');
+  - text: <code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should contain only three elements.
+    testString: assert.equal(sym([1, 2, 3], [5, 2, 1, 4, 5]).length, 3, '<code>sym([1, 2, 3], [5, 2, 1, 4, 5])</code> should contain only three elements.');
+  - text: <code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should return <code>[1, 4, 5]</code>
+    testString: assert.sameMembers(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]), [1, 4, 5], '<code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should return <code>[1, 4, 5]</code>');
+  - text: <code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should contain only three elements.
+    testString: assert.equal(sym([1, 2, 5], [2, 3, 5], [3, 4, 5]).length, 3, '<code>sym([1, 2, 5], [2, 3, 5], [3, 4, 5])</code> should contain only three elements.');
+  - text: <code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should return <code>[1, 4, 5]</code>.
+    testString: assert.sameMembers(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]), [1, 4, 5], '<code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should return <code>[1, 4, 5]</code>.');
+  - text: <code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should contain only three elements.
+    testString: assert.equal(sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]).length, 3, '<code>sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5])</code> should contain only three elements.');
+  - text: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should return <code>[2, 3, 4, 6, 7]</code>.
+    testString: assert.sameMembers(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3]), [2, 3, 4, 6, 7], '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should return <code>[2, 3, 4, 6, 7]</code>.');
+  - text: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should contain only five elements.
+    testString: assert.equal(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3]).length, 5, '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3])</code> should contain only five elements.');
+  - text: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should return <code>[1, 2, 4, 5, 6, 7, 8, 9]</code>.
+    testString: assert.sameMembers(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1]), [1, 2, 4, 5, 6, 7, 8, 9], '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should return <code>[1, 2, 4, 5, 6, 7, 8, 9]</code>.');
+  - text: <code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should contain only eight elements.
+    testString: assert.equal(sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1]).length, 8, '<code>sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1])</code> should contain only eight elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-bubble-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-bubble-sort.english.md
index 16ff19f30d..c136106729 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-bubble-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-bubble-sort.english.md
@@ -24,13 +24,13 @@ This method requires multiple iterations through the array and for average and w
 ```yml
 tests:
   - text: <code>bubbleSort</code> is a function.
-    testString: 'assert(typeof bubbleSort == "function", "<code>bubbleSort</code> is a function.");'
+    testString: assert(typeof bubbleSort == 'function', '<code>bubbleSort</code> is a function.');
   - text: <code>bubbleSort</code> returns a sorted array (least to greatest).
-    testString: 'assert(isSorted(bubbleSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), "<code>bubbleSort</code> returns a sorted array (least to greatest).");'
+    testString: assert(isSorted(bubbleSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), '<code>bubbleSort</code> returns a sorted array (least to greatest).');
   - text: <code>bubbleSort</code> returns an array that is unchanged except for order.
-    testString: 'assert.sameMembers(bubbleSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], "<code>bubbleSort</code> returns an array that is unchanged except for order.");'
+    testString: assert.sameMembers(bubbleSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], '<code>bubbleSort</code> returns an array that is unchanged except for order.');
   - text: <code>bubbleSort</code> should not use the built-in <code>.sort()</code> method.
-    testString: 'assert.strictEqual(code.search(/\.sort\(/), -1, "<code>bubbleSort</code> should not use the built-in <code>.sort()</code> method.");'
+    testString: assert.strictEqual(code.search(/\.sort\(/), -1, '<code>bubbleSort</code> should not use the built-in <code>.sort()</code> method.');
 
 ```
 
@@ -60,7 +60,10 @@ function bubbleSort(array) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+function isSorted(arr) {
+  var check = (i) => (i == arr.length - 1) ? true : (arr[i] > arr[i + 1]) ? false : check(i + 1);
+  return check(0);
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-insertion-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-insertion-sort.english.md
index 9e92810cf8..8a9af18c6c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-insertion-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-insertion-sort.english.md
@@ -22,13 +22,13 @@ The next sorting method we'll look at is insertion sort. This method works by bu
 ```yml
 tests:
   - text: <code>insertionSort</code> is a function.
-    testString: 'assert(typeof insertionSort == "function", "<code>insertionSort</code> is a function.");'
+    testString: assert(typeof insertionSort == 'function', '<code>insertionSort</code> is a function.');
   - text: <code>insertionSort</code> returns a sorted array (least to greatest).
-    testString: 'assert(isSorted(insertionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), "<code>insertionSort</code> returns a sorted array (least to greatest).");'
+    testString: assert(isSorted(insertionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), '<code>insertionSort</code> returns a sorted array (least to greatest).');
   - text: <code>insertionSort</code> returns an array that is unchanged except for order.
-    testString: 'assert.sameMembers(insertionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], "<code>insertionSort</code> returns an array that is unchanged except for order.");'
+    testString: assert.sameMembers(insertionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], '<code>insertionSort</code> returns an array that is unchanged except for order.');
   - text: <code>insertionSort</code> should not use the built-in <code>.sort()</code> method.
-    testString: 'assert.strictEqual(code.search(/\.sort\(/), -1, "<code>insertionSort</code> should not use the built-in <code>.sort()</code> method.");'
+    testString: assert.strictEqual(code.search(/\.sort\(/), -1, '<code>insertionSort</code> should not use the built-in <code>.sort()</code> method.');
 
 ```
 
@@ -58,7 +58,10 @@ function insertionSort(array) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+function isSorted(arr) {
+  var check = (i) => (i == arr.length - 1) ? true : (arr[i] > arr[i + 1]) ? false : check(i + 1);
+  return check(0);
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-merge-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-merge-sort.english.md
index cd1246df60..214c87059b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-merge-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-merge-sort.english.md
@@ -26,13 +26,13 @@ As an aside, this will be the last sorting algorithm we cover here. However, lat
 ```yml
 tests:
   - text: <code>mergeSort</code> is a function.
-    testString: 'assert(typeof mergeSort == "function", "<code>mergeSort</code> is a function.");'
+    testString: assert(typeof mergeSort == 'function', '<code>mergeSort</code> is a function.');
   - text: <code>mergeSort</code> returns a sorted array (least to greatest).
-    testString: 'assert(isSorted(mergeSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), "<code>mergeSort</code> returns a sorted array (least to greatest).");'
+    testString: assert(isSorted(mergeSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), '<code>mergeSort</code> returns a sorted array (least to greatest).');
   - text: <code>mergeSort</code> returns an array that is unchanged except for order.
-    testString: 'assert.sameMembers(mergeSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], "<code>mergeSort</code> returns an array that is unchanged except for order.");'
+    testString: assert.sameMembers(mergeSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], '<code>mergeSort</code> returns an array that is unchanged except for order.');
   - text: <code>mergeSort</code> should not use the built-in <code>.sort()</code> method.
-    testString: 'assert.strictEqual(code.search(/\.sort\(/), -1, "<code>mergeSort</code> should not use the built-in <code>.sort()</code> method.");'
+    testString: assert.strictEqual(code.search(/\.sort\(/), -1, '<code>mergeSort</code> should not use the built-in <code>.sort()</code> method.');
 
 ```
 
@@ -62,7 +62,10 @@ function mergeSort(array) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+function isSorted(arr) {
+  var check = (i) => (i == arr.length - 1) ? true : (arr[i] > arr[i + 1]) ? false : check(i + 1);
+  return check(0);
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-quick-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-quick-sort.english.md
index cd143db34c..e8dd14c08b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-quick-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-quick-sort.english.md
@@ -23,13 +23,13 @@ Quick sort is a very efficient sorting method, providing <i>O(nlog(n))</i> perfo
 ```yml
 tests:
   - text: <code>quickSort</code> is a function.
-    testString: 'assert(typeof quickSort == "function", "<code>quickSort</code> is a function.");'
+    testString: assert(typeof quickSort == 'function', '<code>quickSort</code> is a function.');
   - text: <code>quickSort</code> returns a sorted array (least to greatest).
-    testString: 'assert(isSorted(quickSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), "<code>quickSort</code> returns a sorted array (least to greatest).");'
+    testString: assert(isSorted(quickSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), '<code>quickSort</code> returns a sorted array (least to greatest).');
   - text: <code>quickSort</code> returns an array that is unchanged except for order.
-    testString: 'assert.sameMembers(quickSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], "<code>quickSort</code> returns an array that is unchanged except for order.");'
+    testString: assert.sameMembers(quickSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], '<code>quickSort</code> returns an array that is unchanged except for order.');
   - text: <code>quickSort</code> should not use the built-in <code>.sort()</code> method.
-    testString: 'assert.strictEqual(code.search(/\.sort\(/), -1, "<code>quickSort</code> should not use the built-in <code>.sort()</code> method.");'
+    testString: assert.strictEqual(code.search(/\.sort\(/), -1, '<code>quickSort</code> should not use the built-in <code>.sort()</code> method.');
 
 ```
 
@@ -59,7 +59,10 @@ function quickSort(array) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+function isSorted(arr) {
+  var check = (i) => (i == arr.length - 1) ? true : (arr[i] > arr[i + 1]) ? false : check(i + 1);
+  return check(0);
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-selection-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-selection-sort.english.md
index 5db8e11ad0..1b7df4cfb8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-selection-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/implement-selection-sort.english.md
@@ -22,13 +22,13 @@ Here we will implement selection sort. Selection sort works by selecting the min
 ```yml
 tests:
   - text: <code>selectionSort</code> is a function.
-    testString: 'assert(typeof selectionSort == "function", "<code>selectionSort</code> is a function.");'
+    testString: assert(typeof selectionSort == 'function', '<code>selectionSort</code> is a function.');
   - text: <code>selectionSort</code> returns a sorted array (least to greatest).
-    testString: 'assert(isSorted(selectionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), "<code>selectionSort</code> returns a sorted array (least to greatest).");'
+    testString: assert(isSorted(selectionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92])), '<code>selectionSort</code> returns a sorted array (least to greatest).');
   - text: <code>selectionSort</code> returns an array that is unchanged except for order.
-    testString: 'assert.sameMembers(selectionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], "<code>selectionSort</code> returns an array that is unchanged except for order.");'
+    testString: assert.sameMembers(selectionSort([1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92]), [1,4,2,8,345,123,43,32,5643,63,123,43,2,55,1,234,92], '<code>selectionSort</code> returns an array that is unchanged except for order.');
   - text: <code>selectionSort</code> should not use the built-in <code>.sort()</code> method.
-    testString: 'assert.strictEqual(code.search(/\.sort\(/), -1, "<code>selectionSort</code> should not use the built-in <code>.sort()</code> method.");'
+    testString: assert.strictEqual(code.search(/\.sort\(/), -1, '<code>selectionSort</code> should not use the built-in <code>.sort()</code> method.');
 
 ```
 
@@ -58,7 +58,10 @@ function selectionSort(array) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+function isSorted(arr) {
+  var check = (i) => (i == arr.length - 1) ? true : (arr[i] > arr[i + 1]) ? false : check(i + 1);
+  return check(0);
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/inventory-update.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/inventory-update.english.md
index 0f23a1e25c..ce410e5ae4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/inventory-update.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/inventory-update.english.md
@@ -21,17 +21,17 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: The function <code>updateInventory</code> should return an array.
-    testString: 'assert.isArray(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]), "The function <code>updateInventory</code> should return an array.");'
-  - text: '<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return an array with a length of 6.'
-    testString: 'assert.equal(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]).length, 6, "<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return an array with a length of 6.");'
-  - text: '<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]]</code>.'
-    testString: 'assert.deepEqual(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]), [[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]], "<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]]</code>.");'
-  - text: '<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [])</code> should return <code>[[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]]</code>.'
-    testString: 'assert.deepEqual(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], []), [[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], "<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [])</code> should return <code>[[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]]</code>.");'
-  - text: '<code>updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]]</code>.'
-    testString: 'assert.deepEqual(updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]), [[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]], "<code>updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]]</code>.");'
-  - text: '<code>updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]])</code> should return <code>[[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]]</code>.'
-    testString: 'assert.deepEqual(updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]]), [[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]], "<code>updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]])</code> should return <code>[[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]]</code>.");'
+    testString: assert.isArray(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]), 'The function <code>updateInventory</code> should return an array.');
+  - text: <code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return an array with a length of 6.
+    testString: assert.equal(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]).length, 6, '<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return an array with a length of 6.');
+  - text: <code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]]</code>.
+    testString: assert.deepEqual(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]), [[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]], '<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[88, "Bowling Ball"], [2, "Dirty Sock"], [3, "Hair Pin"], [3, "Half-Eaten Apple"], [5, "Microphone"], [7, "Toothpaste"]]</code>.');
+  - text: <code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [])</code> should return <code>[[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]]</code>.
+    testString: assert.deepEqual(updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], []), [[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], '<code>updateInventory([[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]], [])</code> should return <code>[[21, "Bowling Ball"], [2, "Dirty Sock"], [1, "Hair Pin"], [5, "Microphone"]]</code>.');
+  - text: <code>updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]]</code>.
+    testString: assert.deepEqual(updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]]), [[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]], '<code>updateInventory([], [[2, "Hair Pin"], [3, "Half-Eaten Apple"], [67, "Bowling Ball"], [7, "Toothpaste"]])</code> should return <code>[[67, "Bowling Ball"], [2, "Hair Pin"], [3, "Half-Eaten Apple"], [7, "Toothpaste"]]</code>.');
+  - text: <code>updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]])</code> should return <code>[[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]]</code>.
+    testString: assert.deepEqual(updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]]), [[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]], '<code>updateInventory([[0, "Bowling Ball"], [0, "Dirty Sock"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]])</code> should return <code>[[1, "Bowling Ball"], [0, "Dirty Sock"], [1, "Hair Pin"], [1, "Half-Eaten Apple"], [0, "Microphone"], [1, "Toothpaste"]]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/no-repeats-please.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/no-repeats-please.english.md
index 15b3d33343..a23d712b20 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/no-repeats-please.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/no-repeats-please.english.md
@@ -22,25 +22,25 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 ```yml
 tests:
   - text: <code>permAlone("aab")</code> should return a number.
-    testString: 'assert.isNumber(permAlone("aab"), "<code>permAlone("aab")</code> should return a number.");'
+    testString: assert.isNumber(permAlone('aab'), '<code>permAlone("aab")</code> should return a number.');
   - text: <code>permAlone("aab")</code> should return 2.
-    testString: 'assert.strictEqual(permAlone("aab"), 2, "<code>permAlone("aab")</code> should return 2.");'
+    testString: assert.strictEqual(permAlone('aab'), 2, '<code>permAlone("aab")</code> should return 2.');
   - text: <code>permAlone("aaa")</code> should return 0.
-    testString: 'assert.strictEqual(permAlone("aaa"), 0, "<code>permAlone("aaa")</code> should return 0.");'
+    testString: assert.strictEqual(permAlone('aaa'), 0, '<code>permAlone("aaa")</code> should return 0.');
   - text: <code>permAlone("aabb")</code> should return 8.
-    testString: 'assert.strictEqual(permAlone("aabb"), 8, "<code>permAlone("aabb")</code> should return 8.");'
+    testString: assert.strictEqual(permAlone('aabb'), 8, '<code>permAlone("aabb")</code> should return 8.');
   - text: <code>permAlone("abcdefa")</code> should return 3600.
-    testString: 'assert.strictEqual(permAlone("abcdefa"), 3600, "<code>permAlone("abcdefa")</code> should return 3600.");'
+    testString: assert.strictEqual(permAlone('abcdefa'), 3600, '<code>permAlone("abcdefa")</code> should return 3600.');
   - text: <code>permAlone("abfdefa")</code> should return 2640.
-    testString: 'assert.strictEqual(permAlone("abfdefa"), 2640, "<code>permAlone("abfdefa")</code> should return 2640.");'
+    testString: assert.strictEqual(permAlone('abfdefa'), 2640, '<code>permAlone("abfdefa")</code> should return 2640.');
   - text: <code>permAlone("zzzzzzzz")</code> should return 0.
-    testString: 'assert.strictEqual(permAlone("zzzzzzzz"), 0, "<code>permAlone("zzzzzzzz")</code> should return 0.");'
+    testString: assert.strictEqual(permAlone('zzzzzzzz'), 0, '<code>permAlone("zzzzzzzz")</code> should return 0.');
   - text: <code>permAlone("a")</code> should return 1.
-    testString: 'assert.strictEqual(permAlone("a"), 1, "<code>permAlone("a")</code> should return 1.");'
+    testString: assert.strictEqual(permAlone('a'), 1, '<code>permAlone("a")</code> should return 1.');
   - text: <code>permAlone("aaab")</code> should return 0.
-    testString: 'assert.strictEqual(permAlone("aaab"), 0, "<code>permAlone("aaab")</code> should return 0.");'
+    testString: assert.strictEqual(permAlone('aaab'), 0, '<code>permAlone("aaab")</code> should return 0.');
   - text: <code>permAlone("aaabb")</code> should return 12.
-    testString: 'assert.strictEqual(permAlone("aaabb"), 12, "<code>permAlone("aaabb")</code> should return 12.");'
+    testString: assert.strictEqual(permAlone('aaabb'), 12, '<code>permAlone("aaabb")</code> should return 12.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/algorithms/pairwise.english.md b/curriculum/challenges/english/08-coding-interview-prep/algorithms/pairwise.english.md
index a8ce616dad..eaca070054 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/algorithms/pairwise.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/algorithms/pairwise.english.md
@@ -25,16 +25,16 @@ Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-yo
 
 ```yml
 tests:
-  - text: '<code>pairwise([1, 4, 2, 3, 0, 5], 7)</code> should return 11.'
-    testString: 'assert.deepEqual(pairwise([1, 4, 2, 3, 0, 5], 7), 11, "<code>pairwise([1, 4, 2, 3, 0, 5], 7)</code> should return 11.");'
-  - text: '<code>pairwise([1, 3, 2, 4], 4)</code> should return 1.'
-    testString: 'assert.deepEqual(pairwise([1, 3, 2, 4], 4), 1, "<code>pairwise([1, 3, 2, 4], 4)</code> should return 1.");'
-  - text: '<code>pairwise([1, 1, 1], 2)</code> should return 1.'
-    testString: 'assert.deepEqual(pairwise([1, 1, 1], 2), 1, "<code>pairwise([1, 1, 1], 2)</code> should return 1.");'
-  - text: '<code>pairwise([0, 0, 0, 0, 1, 1], 1)</code> should return 10.'
-    testString: 'assert.deepEqual(pairwise([0, 0, 0, 0, 1, 1], 1), 10, "<code>pairwise([0, 0, 0, 0, 1, 1], 1)</code> should return 10.");'
-  - text: '<code>pairwise([], 100)</code> should return 0.'
-    testString: 'assert.deepEqual(pairwise([], 100), 0, "<code>pairwise([], 100)</code> should return 0.");'
+  - text: <code>pairwise([1, 4, 2, 3, 0, 5], 7)</code> should return 11.
+    testString: assert.deepEqual(pairwise([1, 4, 2, 3, 0, 5], 7), 11, '<code>pairwise([1, 4, 2, 3, 0, 5], 7)</code> should return 11.');
+  - text: <code>pairwise([1, 3, 2, 4], 4)</code> should return 1.
+    testString: assert.deepEqual(pairwise([1, 3, 2, 4], 4), 1, '<code>pairwise([1, 3, 2, 4], 4)</code> should return 1.');
+  - text: <code>pairwise([1, 1, 1], 2)</code> should return 1.
+    testString: assert.deepEqual(pairwise([1, 1, 1], 2), 1, '<code>pairwise([1, 1, 1], 2)</code> should return 1.');
+  - text: <code>pairwise([0, 0, 0, 0, 1, 1], 1)</code> should return 10.
+    testString: assert.deepEqual(pairwise([0, 0, 0, 0, 1, 1], 1), 10, '<code>pairwise([0, 0, 0, 0, 1, 1], 1)</code> should return 10.');
+  - text: <code>pairwise([], 100)</code> should return 0.
+    testString: assert.deepEqual(pairwise([], 100), 0, '<code>pairwise([], 100)</code> should return 0.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-a-new-element-to-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-a-new-element-to-a-binary-search-tree.english.md
index e52367d99a..9e03b049b3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-a-new-element-to-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-a-new-element-to-a-binary-search-tree.english.md
@@ -22,13 +22,13 @@ Hint: trees are naturally recursive data structures!
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>add</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.add == "function")})(), "The binary search tree has a method called <code>add</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.add == 'function')})(), 'The binary search tree has a method called <code>add</code>.');
   - text: The add method adds elements according to the binary search tree rules.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.add !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); const expectedResult = [ 1, 4, 7, 8, 34, 45, 73, 87 ]; const result = test.inOrder(); return (expectedResult.toString() === result.toString()); })(), "The add method adds elements according to the binary search tree rules.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.add !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); const expectedResult = [ 1, 4, 7, 8, 34, 45, 73, 87 ]; const result = test.inOrder(); return (expectedResult.toString() === result.toString()); })(), 'The add method adds elements according to the binary search tree rules.');
   - text: Adding an element that already exists returns <code>null</code>
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.add !== "function") { return false; }; test.add(4); return test.add(4) == null; })(), "Adding an element that already exists returns <code>null</code>");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.add !== 'function') { return false; }; test.add(4); return test.add(4) == null; })(), 'Adding an element that already exists returns <code>null</code>');
 
 ```
 
@@ -60,7 +60,48 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    isBinarySearchTree() {
+        if (this.root == null) {
+            return null;
+        } else {
+            var check = true;
+            function checkTree(node) {
+                if (node.left != null) {
+                    var left = node.left;
+                    if (left.value > node.value) {
+                        check = false;
+                    } else {
+                        checkTree(left);
+                    }
+                }
+                if (node.right != null) {
+                    var right = node.right;
+                    if (right.value < node.value) {
+                        check = false;
+                    } else {
+                        checkTree(right);
+                    };
+                };
+            };
+            checkTree(this.root);
+            return check;
+        };
+    }
+};
+BinarySearchTree.prototype = {
+    inOrder() {
+        if (!this.root) { return null; }
+        var result = new Array();
+        function traverseInOrder(node) {
+             node.left && traverseInOrder(node.left);
+             result.push(node.value);
+             node.right && traverseInOrder(node.right);
+        }
+        traverseInOrder(this.root);
+        return result;
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-elements-at-a-specific-index-in-a-linked-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-elements-at-a-specific-index-in-a-linked-list.english.md
index 950352b101..ab7224ac9c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-elements-at-a-specific-index-in-a-linked-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/add-elements-at-a-specific-index-in-a-linked-list.english.md
@@ -26,11 +26,11 @@ Remember to check if the given index is a negative or is longer than the length
 ```yml
 tests:
   - text: Your <code>addAt</code> method should reassign <code>head</code> to the new node when the given index is 0.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.addAt(0,"cat"); return test.head().element === "cat"}()), "Your <code>addAt</code> method should reassign <code>head</code> to the new node when the given index is 0.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.addAt(0,'cat'); return test.head().element === 'cat'}()), 'Your <code>addAt</code> method should reassign <code>head</code> to the new node when the given index is 0.');
   - text: Your <code>addAt</code> method should increase the length of the linked list by one for each new node added to the linked list.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.addAt(0,"cat"); return test.size() === 3}()), "Your <code>addAt</code> method should increase the length of the linked list by one for each new node added to the linked list.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.addAt(0,'cat'); return test.size() === 3}()), 'Your <code>addAt</code> method should increase the length of the linked list by one for each new node added to the linked list.');
   - text: Your <code>addAt</code> method should return <code>false</code> if a node was unable to be added.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); return (test.addAt(4,"cat") === false); }()), "Your <code>addAt</code> method should return <code>false</code> if a node was unable to be added.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); return (test.addAt(4,'cat') === false); }()), 'Your <code>addAt</code> method should return <code>false</code> if a node was unable to be added.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-list.english.md
index 516892b549..cdee4ae307 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-list.english.md
@@ -27,13 +27,13 @@ Create a social network as an undirected graph with 4 nodes/people named <code>J
 ```yml
 tests:
   - text: <code>undirectedAdjList</code> should only contain four nodes.
-    testString: 'assert(Object.keys(undirectedAdjList).length === 4, "<code>undirectedAdjList</code> should only contain four nodes.");'
+    testString: assert(Object.keys(undirectedAdjList).length === 4, '<code>undirectedAdjList</code> should only contain four nodes.');
   - text: There should be an edge between <code>Jeff</code> and <code>James</code>.
-    testString: 'assert(undirectedAdjList.James.indexOf("Jeff") !== -1 && undirectedAdjList.Jeff.indexOf("James") !== -1, "There should be an edge between <code>Jeff</code> and <code>James</code>.");'
+    testString: assert(undirectedAdjList.James.indexOf("Jeff") !== -1 && undirectedAdjList.Jeff.indexOf("James") !== -1, 'There should be an edge between <code>Jeff</code> and <code>James</code>.');
   - text: There should be an edge between <code>Jill</code> and <code>Jenny</code>.
-    testString: 'assert(undirectedAdjList.Jill.indexOf("Jenny") !== -1 && undirectedAdjList.Jill.indexOf("Jenny") !== -1, "There should be an edge between <code>Jill</code> and <code>Jenny</code>.");'
+    testString: assert(undirectedAdjList.Jill.indexOf("Jenny") !== -1 && undirectedAdjList.Jill.indexOf("Jenny") !== -1, 'There should be an edge between <code>Jill</code> and <code>Jenny</code>.');
   - text: There should be an edge between <code>Jeff</code> and <code>Jenny</code>.
-    testString: 'assert(undirectedAdjList.Jeff.indexOf("Jenny") !== -1 && undirectedAdjList.Jenny.indexOf("Jeff") !== -1, "There should be an edge between <code>Jeff</code> and <code>Jenny</code>.");'
+    testString: assert(undirectedAdjList.Jeff.indexOf("Jenny") !== -1 && undirectedAdjList.Jenny.indexOf("Jeff") !== -1, 'There should be an edge between <code>Jeff</code> and <code>Jenny</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-matrix.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-matrix.english.md
index 9d841c7a44..b2a83b75c5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-matrix.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/adjacency-matrix.english.md
@@ -29,15 +29,15 @@ Create an adjacency matrix of an undirected graph with five nodes. This matrix s
 ```yml
 tests:
   - text: <code>undirectedAdjList</code> should only contain five nodes.
-    testString: 'assert((adjMatUndirected.length === 5) && adjMatUndirected.map(function(x) { return x.length === 5 }).reduce(function(a, b) { return a && b }) , "<code>undirectedAdjList</code> should only contain five nodes.");'
+    testString: assert((adjMatUndirected.length === 5) && adjMatUndirected.map(function(x) { return x.length === 5 }).reduce(function(a, b) { return a && b }) , '<code>undirectedAdjList</code> should only contain five nodes.');
   - text: There should be an edge between the first and fourth node.
-    testString: 'assert((adjMatUndirected[0][3] === 1) && (adjMatUndirected[3][0] === 1), "There should be an edge between the first and fourth node.");'
+    testString: assert((adjMatUndirected[0][3] === 1) && (adjMatUndirected[3][0] === 1), 'There should be an edge between the first and fourth node.');
   - text: There should be an edge between the first and third node.
-    testString: 'assert((adjMatUndirected[0][2] === 1) && (adjMatUndirected[2][0] === 1), "There should be an edge between the first and third node.");'
+    testString: assert((adjMatUndirected[0][2] === 1) && (adjMatUndirected[2][0] === 1), 'There should be an edge between the first and third node.');
   - text: There should be an edge between the third and fifth node.
-    testString: 'assert((adjMatUndirected[2][4] === 1) && (adjMatUndirected[4][2] === 1), "There should be an edge between the third and fifth node.");'
+    testString: assert((adjMatUndirected[2][4] === 1) && (adjMatUndirected[4][2] === 1), 'There should be an edge between the third and fifth node.');
   - text: There should be an edge between the fourth and fifth node.
-    testString: 'assert((adjMatUndirected[3][4] === 1) && (adjMatUndirected[4][3] === 1), "There should be an edge between the fourth and fifth node.");'
+    testString: assert((adjMatUndirected[3][4] === 1) && (adjMatUndirected[4][3] === 1), 'There should be an edge between the fourth and fifth node.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/breadth-first-search.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/breadth-first-search.english.md
index fda39b1140..f762e5f1fe 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/breadth-first-search.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/breadth-first-search.english.md
@@ -29,13 +29,13 @@ Your function will output a JavaScript object key-value pairs with the node and
 ```yml
 tests:
   - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return <code>{0: 1, 1: 0, 2: 1, 3: 2}</code>'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; var results = bfs(graph, 1); return isEquivalent(results, {0: 1, 1: 0, 2: 1, 3: 2})})(), "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return <code>{0: 1, 1: 0, 2: 1, 3: 2}</code>");'
+    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; var results = bfs(graph, 1); return isEquivalent(results, {0: 1, 1: 0, 2: 1, 3: 2})})(), ''The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return <code>{0: 1, 1: 0, 2: 1, 3: 2}</code>'');'
   - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>1</code> should return <code>{0: 1, 1: 0, 2: 1, 3: Infinity}</code>'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]; var results = bfs(graph, 1); return isEquivalent(results, {0: 1, 1: 0, 2: 1, 3: Infinity})})(), "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>1</code> should return <code>{0: 1, 1: 0, 2: 1, 3: Infinity}</code>");'
+    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]; var results = bfs(graph, 1); return isEquivalent(results, {0: 1, 1: 0, 2: 1, 3: Infinity})})(), ''The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>1</code> should return <code>{0: 1, 1: 0, 2: 1, 3: Infinity}</code>'');'
   - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return <code>{0: 0, 1: 1, 2: 2, 3: 3}</code>'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; var results = bfs(graph, 0); return isEquivalent(results, {0: 0, 1: 1, 2: 2, 3: 3})})(), "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return <code>{0: 0, 1: 1, 2: 2, 3: 3}</code>");'
+    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; var results = bfs(graph, 0); return isEquivalent(results, {0: 0, 1: 1, 2: 2, 3: 3})})(), ''The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return <code>{0: 0, 1: 1, 2: 2, 3: 3}</code>'');'
   - text: 'The input graph <code>[[0, 1], [1, 0]]</code> with a start node of <code>0</code> should return <code>{0: 0, 1: 1}</code>'
-    testString: 'assert((function() { var graph = [[0, 1], [1, 0]]; var results = bfs(graph, 0); return isEquivalent(results, {0: 0, 1: 1})})(), "The input graph <code>[[0, 1], [1, 0]]</code> with a start node of <code>0</code> should return <code>{0: 0, 1: 1}</code>");'
+    testString: 'assert((function() { var graph = [[0, 1], [1, 0]]; var results = bfs(graph, 0); return isEquivalent(results, {0: 0, 1: 1})})(), ''The input graph <code>[[0, 1], [1, 0]]</code> with a start node of <code>0</code> should return <code>{0: 0, 1: 1}</code>'');'
 
 ```
 
@@ -70,7 +70,28 @@ console.log(bfs(exBFSGraph, 3));
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+// Source: http://adripofjavascript.com/blog/drips/object-equality-in-javascript.html
+function isEquivalent(a, b) {
+    // Create arrays of property names
+    var aProps = Object.getOwnPropertyNames(a);
+    var bProps = Object.getOwnPropertyNames(b);
+    // If number of properties is different,
+    // objects are not equivalent
+    if (aProps.length != bProps.length) {
+        return false;
+    }
+    for (var i = 0; i < aProps.length; i++) {
+        var propName = aProps[i];
+        // If values of same property are not equal,
+        // objects are not equivalent
+        if (a[propName] !== b[propName]) {
+            return false;
+        }
+    }
+    // If we made it this far, objects
+    // are considered equivalent
+    return true;
+}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/check-if-an-element-is-present-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/check-if-an-element-is-present-in-a-binary-search-tree.english.md
index 966b20ebb7..1a304f7eda 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/check-if-an-element-is-present-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/check-if-an-element-is-present-in-a-binary-search-tree.english.md
@@ -22,13 +22,13 @@ Instructions: In this challenge, we will create a utility for our tree. Write a
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>isPresent</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.isPresent == "function")})(), "The binary search tree has a method called <code>isPresent</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.isPresent == 'function')})(), 'The binary search tree has a method called <code>isPresent</code>.');
   - text: The <code>isPresent</code> method correctly checks for the presence or absence of elements added to the tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.isPresent !== "function") { return false; }; test.add(4); test.add(7); test.add(411); test.add(452); return ( test.isPresent(452) && test.isPresent(411) && test.isPresent(7) && !test.isPresent(100) ); })(), "The <code>isPresent</code> method correctly checks for the presence or absence of elements added to the tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.isPresent !== 'function') { return false; }; test.add(4); test.add(7); test.add(411); test.add(452); return ( test.isPresent(452) && test.isPresent(411) && test.isPresent(7) && !test.isPresent(100) ); })(), 'The <code>isPresent</code> method correctly checks for the presence or absence of elements added to the tree.');
   - text: <code>isPresent</code> handles cases where the tree is empty.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.isPresent !== "function") { return false; }; return test.isPresent(5) == false; })(), "<code>isPresent</code> handles cases where the tree is empty.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.isPresent !== 'function') { return false; }; return test.isPresent(5) == false; })(), '<code>isPresent</code> handles cases where the tree is empty.');
 
 ```
 
@@ -60,7 +60,36 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-circular-queue.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-circular-queue.english.md
index b01561d3d2..2e8c8b6a77 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-circular-queue.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-circular-queue.english.md
@@ -32,15 +32,15 @@ In addition, the <code>enqueue</code> method should return the item you enqueued
 ```yml
 tests:
   - text: The <code>enqueue</code> method adds items to the circular queue.
-    testString: 'assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); var print = test.print(); return print[0] === 17 && print[1] === 32 && print[2] === 591; })(), "The <code>enqueue</code> method adds items to the circular queue.");'
+    testString: assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); var print = test.print(); return print[0] === 17 && print[1] === 32 && print[2] === 591; })(), 'The <code>enqueue</code> method adds items to the circular queue.');
   - text: You cannot enqueue items past the read pointer.
-    testString: 'assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); test.enqueue(13); test.enqueue(25); test.enqueue(59); var print = test.print(); return print[0] === 17 && print[1] === 32 && print[2] === 591; })(), "You cannot enqueue items past the read pointer.");'
+    testString: assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); test.enqueue(13); test.enqueue(25); test.enqueue(59); var print = test.print(); return print[0] === 17 && print[1] === 32 && print[2] === 591; })(), 'You cannot enqueue items past the read pointer.');
   - text: The <code>dequeue</code> method dequeues items from the queue.
-    testString: 'assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); return test.dequeue() === 17 && test.dequeue() === 32 && test.dequeue() === 591; })(), "The <code>dequeue</code> method dequeues items from the queue.");'
+    testString: assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); return test.dequeue() === 17 && test.dequeue() === 32 && test.dequeue() === 591; })(), 'The <code>dequeue</code> method dequeues items from the queue.');
   - text: After an item is dequeued its position in the queue should be reset to <code>null</code>.
-    testString: 'assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(672); test.dequeue(); test.dequeue(); var print = test.print(); return print[0] === null && print[1] === null && print[2] === 672; })(), "After an item is dequeued its position in the queue should be reset to <code>null</code>.");'
+    testString: assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(672); test.dequeue(); test.dequeue(); var print = test.print(); return print[0] === null && print[1] === null && print[2] === 672; })(), 'After an item is dequeued its position in the queue should be reset to <code>null</code>.');
   - text: Trying to dequeue past the write pointer returns <code>null</code> and does not advance the write pointer.
-    testString: 'assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); return test.dequeue() === 17 && test.dequeue() === 32 && test.dequeue() === 591 && test.dequeue() === null && test.dequeue() === null && test.dequeue() === null && test.dequeue() === null && test.enqueue(100) === 100 && test.dequeue() === 100; })(), "Trying to dequeue past the write pointer returns <code>null</code> and does not advance the write pointer.");'
+    testString: assert((function(){ var test = new CircularQueue(3); test.enqueue(17); test.enqueue(32); test.enqueue(591); return test.dequeue() === 17 && test.dequeue() === 32 && test.dequeue() === 591 && test.dequeue() === null && test.dequeue() === null && test.dequeue() === null && test.dequeue() === null && test.enqueue(100) === 100 && test.dequeue() === 100; })(), 'Trying to dequeue past the write pointer returns <code>null</code> and does not advance the write pointer.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-doubly-linked-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-doubly-linked-list.english.md
index c9605cb467..c7cc3fca5e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-doubly-linked-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-doubly-linked-list.english.md
@@ -22,21 +22,21 @@ Be careful to handle any possible edge cases when writing these methods, such as
 ```yml
 tests:
   - text: The DoublyLinkedList data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; return (typeof test == "object")})(), "The DoublyLinkedList data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; return (typeof test == 'object')})(), 'The DoublyLinkedList data structure exists.');
   - text: The DoublyLinkedList has a method called add.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; if (test.add == undefined) { return false; }; return (typeof test.add == "function")})(), "The DoublyLinkedList has a method called add.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; if (test.add == undefined) { return false; }; return (typeof test.add == 'function')})(), 'The DoublyLinkedList has a method called add.');
   - text: The DoublyLinkedList has a method called remove.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; if (test.remove == undefined) { return false; }; return (typeof test.remove == "function")})(), "The DoublyLinkedList has a method called remove.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; if (test.remove == undefined) { return false; }; return (typeof test.remove == 'function')})(), 'The DoublyLinkedList has a method called remove.');
   - text: Removing an item from an empty list returns null.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; return (test.remove(100) == null); })(), "Removing an item from an empty list returns null.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; return (test.remove(100) == null); })(), 'Removing an item from an empty list returns null.');
   - text: The add method adds items to the list.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(5); test.add(6); test.add(723); return (test.print().join("") == "56723"); })(), "The add method adds items to the list.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; test.add(5); test.add(6); test.add(723); return (test.print().join('') == '56723'); })(), 'The add method adds items to the list.');
   - text: Each node keeps track of the previous node.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(50); test.add(68); test.add(73); return (test.printReverse().join("") == "736850"); })(), "Each node keeps track of the previous node.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; test.add(50); test.add(68); test.add(73); return (test.printReverse().join('') == '736850'); })(), 'Each node keeps track of the previous node.');
   - text: The first item can be removed from the list.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(25); test.add(35); test.add(60); test.remove(25); return ( test.print().join("") == "3560" ) })(), "The first item can be removed from the list.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; test.add(25); test.add(35); test.add(60); test.remove(25); return ( test.print().join('') == '3560' ) })(), 'The first item can be removed from the list.');
   - text: The last item can be removed from the list.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(25); test.add(35); test.add(60); test.remove(60); return ( test.print().join("") == "2535" ) })(), "The last item can be removed from the list.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; test.add(25); test.add(35); test.add(60); test.remove(60); return ( test.print().join('') == '2535' ) })(), 'The last item can be removed from the list.');
 
 ```
 
@@ -68,7 +68,36 @@ var DoublyLinkedList = function() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+DoublyLinkedList.prototype = {
+  print() {
+    if (this.head == null) {
+      return null;
+    } else {
+      var result = new Array();
+      var node = this.head;
+      while (node.next != null) {
+        result.push(node.data);
+        node = node.next;
+      };
+      result.push(node.data);
+      return result;
+    };
+  },
+  printReverse() {
+    if (this.tail == null) {
+      return null;
+    } else {
+      var result = new Array();
+      var node = this.tail;
+      while (node.prev != null) {
+        result.push(node.data);
+        node = node.prev;
+      };
+      result.push(node.data);
+      return result;
+    };
+  } 
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-hash-table.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-hash-table.english.md
index f63e28c9d6..4cc279cfa2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-hash-table.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-hash-table.english.md
@@ -24,21 +24,21 @@ Be sure to write your code to account for collisions!
 ```yml
 tests:
   - text: The HashTable data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; return (typeof test === "object")})(), "The HashTable data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; return (typeof test === 'object')})(), 'The HashTable data structure exists.');
   - text: The HashTable has an add method.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; return ((typeof test.add) === "function")})(), "The HashTable has an add method.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; return ((typeof test.add) === 'function')})(), 'The HashTable has an add method.');
   - text: The HashTable has an remove method.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; return ((typeof test.remove) === "function")})(), "The HashTable has an remove method.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; return ((typeof test.remove) === 'function')})(), 'The HashTable has an remove method.');
   - text: The HashTable has an lookup method.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; return ((typeof test.lookup) === "function")})(), "The HashTable has an lookup method.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; return ((typeof test.lookup) === 'function')})(), 'The HashTable has an lookup method.');
   - text: The add method adds key value pairs and the lookup method returns the values associated with a given key.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; test.add("key", "value"); return (test.lookup("key") === "value")})(), "The add method adds key value pairs and the lookup method returns the values associated with a given key.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; test.add('key', 'value'); return (test.lookup('key') === 'value')})(), 'The add method adds key value pairs and the lookup method returns the values associated with a given key.');
   - text: The remove method accepts a key as input and removes the associated key value pair.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; test.add("key", "value"); test.remove("key"); return (test.lookup("key") === null)})(), "The remove method accepts a key as input and removes the associated key value pair.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; test.add('key', 'value'); test.remove('key'); return (test.lookup('key') === null)})(), 'The remove method accepts a key as input and removes the associated key value pair.');
   - text: Items are added using the hash function.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; called = 0; test.add("key1","value1"); test.add("key2","value2"); test.add("key3","value3"); return (called === 3)})(), "Items are added using the hash function.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; called = 0; test.add('key1','value1'); test.add('key2','value2'); test.add('key3','value3'); return (called === 3)})(), 'Items are added using the hash function.');
   - text: The hash table handles collisions.
-    testString: 'assert((function() { var test = false; if (typeof HashTable !== "undefined") { test = new HashTable() }; called = 0; test.add("key1","value1"); test.add("1key","value2"); test.add("ke1y","value3"); return (test.lookup("key1") === "value1" && test.lookup("1key") == "value2" && test.lookup("ke1y") == "value3")})(), "The hash table handles collisions.");'
+    testString: assert((function() { var test = false; if (typeof HashTable !== 'undefined') { test = new HashTable() }; called = 0; test.add('key1','value1'); test.add('1key','value2'); test.add('ke1y','value3'); return (test.lookup('key1') === 'value1' && test.lookup('1key') == 'value2' && test.lookup('ke1y') == 'value3')})(), 'The hash table handles collisions.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-linked-list-class.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-linked-list-class.english.md
index 868144b7da..a8ad4be129 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-linked-list-class.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-linked-list-class.english.md
@@ -25,13 +25,13 @@ Your list's <code>length</code> should increase by one every time an element is
 ```yml
 tests:
   - text: Your <code>LinkedList</code> class should have a <code>add</code> method.
-    testString: 'assert((function(){var test = new LinkedList(); return (typeof test.add === "function")}()), "Your <code>LinkedList</code> class should have a <code>add</code> method.");'
+    testString: assert((function(){var test = new LinkedList(); return (typeof test.add === 'function')}()), 'Your <code>LinkedList</code> class should have a <code>add</code> method.');
   - text: Your <code>LinkedList</code> class should assign <code>head</code> to the first node added.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); return test.head().element === "cat"}()), "Your <code>LinkedList</code> class should assign <code>head</code> to the first node added.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); return test.head().element === 'cat'}()), 'Your <code>LinkedList</code> class should assign <code>head</code> to the first node added.');
   - text: The previous <code>node</code> in your <code>LinkedList</code> class should have reference to the newest node created.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); return test.head().next.element === "dog"}()), "The previous <code>node</code> in your <code>LinkedList</code> class should have reference to the newest node created.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); return test.head().next.element === 'dog'}()), 'The previous <code>node</code> in your <code>LinkedList</code> class should have reference to the newest node created.');
   - text: The  <code>size</code> of your <code>LinkedList</code> class should equal the amount of nodes in the linked list.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); return test.size() === 2}()), "The  <code>size</code> of your <code>LinkedList</code> class should equal the amount of nodes in the linked list.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); return test.size() === 2}()), 'The  <code>size</code> of your <code>LinkedList</code> class should equal the amount of nodes in the linked list.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-map-data-structure.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-map-data-structure.english.md
index 100beb8ff3..a8fc415e88 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-map-data-structure.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-map-data-structure.english.md
@@ -31,19 +31,19 @@ Use the <code>Map</code> object provided here as a wrapper around a JavaScript <
 ```yml
 tests:
   - text: The Map data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; return (typeof test == "object")})(), "The Map data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; return (typeof test == 'object')})(), 'The Map data structure exists.');
   - text: 'The Map object has the following methods: add, remove, get, has, values, clear, and size.'
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; return (typeof test.add == "function" && typeof test.remove == "function" && typeof test.get == "function" && typeof test.has == "function" && typeof test.values == "function" && typeof test.clear == "function" && typeof test.size == "function")})(), "The Map object has the following methods: add, remove, get, has, values, clear, and size.");'
+    testString: 'assert((function() { var test = false; if (typeof Map !== ''undefined'') { test = new Map() }; return (typeof test.add == ''function'' && typeof test.remove == ''function'' && typeof test.get == ''function'' && typeof test.has == ''function'' && typeof test.values == ''function'' && typeof test.clear == ''function'' && typeof test.size == ''function'')})(), ''The Map object has the following methods: add, remove, get, has, values, clear, and size.'');'
   - text: The add method adds items to the map.
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; test.add(5,6); test.add(2,3); test.add(2,5); return (test.size() == 2)})(), "The add method adds items to the map.");'
+    testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add(5,6); test.add(2,3); test.add(2,5); return (test.size() == 2)})(), 'The add method adds items to the map.');
   - text: The has method returns true for added items and false for absent items.
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; test.add("test","value"); return (test.has("test") && !test.has("false"))})(), "The has method returns true for added items and false for absent items.");'
+    testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('test','value'); return (test.has('test') && !test.has('false'))})(), 'The has method returns true for added items and false for absent items.');
   - text: The get method accepts keys as input and returns the associated values.
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; test.add("abc","def"); return (test.get("abc") == "def")})(), "The get method accepts keys as input and returns the associated values.");'
+    testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('abc','def'); return (test.get('abc') == 'def')})(), 'The get method accepts keys as input and returns the associated values.');
   - text: The values method returns all the values stored in the map as strings in an array.
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; test.add("a","b"); test.add("c","d"); test.add("e","f"); var vals = test.values(); return (vals.indexOf("b") != -1 && vals.indexOf("d") != -1 && vals.indexOf("f") != -1)})(), "The values method returns all the values stored in the map as strings in an array.");'
+    testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('a','b'); test.add('c','d'); test.add('e','f'); var vals = test.values(); return (vals.indexOf('b') != -1 && vals.indexOf('d') != -1 && vals.indexOf('f') != -1)})(), 'The values method returns all the values stored in the map as strings in an array.');
   - text: The clear method empties the map and the size method returns the number of items present in the map.
-    testString: 'assert((function() { var test = false; if (typeof Map !== "undefined") { test = new Map() }; test.add("b","b"); test.add("c","d"); test.remove("asdfas"); var init = test.size(); test.clear(); return (init == 2 && test.size() == 0)})(), "The clear method empties the map and the size method returns the number of items present in the map.");'
+    testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('b','b'); test.add('c','d'); test.remove('asdfas'); var init = test.size(); test.clear(); return (init == 2 && test.size() == 0)})(), 'The clear method empties the map and the size method returns the number of items present in the map.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-priority-queue-class.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-priority-queue-class.english.md
index e4a91b3ee3..d8be2af6d3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-priority-queue-class.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-priority-queue-class.english.md
@@ -26,19 +26,19 @@ The <code>enqueue</code> should accept items with the format shown above (<code>
 ```yml
 tests:
   - text: Your <code>Queue</code> class should have a <code>enqueue</code> method.
-    testString: 'assert((function(){var test = new PriorityQueue();  return (typeof test.enqueue === "function")}()), "Your <code>Queue</code> class should have a <code>enqueue</code> method.");'
+    testString: assert((function(){var test = new PriorityQueue();  return (typeof test.enqueue === 'function')}()), 'Your <code>Queue</code> class should have a <code>enqueue</code> method.');
   - text: Your <code>Queue</code> class should have a <code>dequeue</code> method.
-    testString: 'assert((function(){var test = new PriorityQueue();  return (typeof test.dequeue === "function")}()), "Your <code>Queue</code> class should have a <code>dequeue</code> method.");'
+    testString: assert((function(){var test = new PriorityQueue();  return (typeof test.dequeue === 'function')}()), 'Your <code>Queue</code> class should have a <code>dequeue</code> method.');
   - text: Your <code>Queue</code> class should have a <code>size</code> method.
-    testString: 'assert((function(){var test = new PriorityQueue();  return (typeof test.size === "function")}()), "Your <code>Queue</code> class should have a <code>size</code> method.");'
+    testString: assert((function(){var test = new PriorityQueue();  return (typeof test.size === 'function')}()), 'Your <code>Queue</code> class should have a <code>size</code> method.');
   - text: Your <code>Queue</code> class should have an <code>isEmpty</code> method.
-    testString: 'assert((function(){var test = new PriorityQueue();  return (typeof test.isEmpty === "function")}()), "Your <code>Queue</code> class should have an <code>isEmpty</code> method.");'
+    testString: assert((function(){var test = new PriorityQueue();  return (typeof test.isEmpty === 'function')}()), 'Your <code>Queue</code> class should have an <code>isEmpty</code> method.');
   - text: Your PriorityQueue should correctly keep track of the current number of items using the <code>size</code> method as items are enqueued and dequeued.
-    testString: 'assert((function(){var test = new PriorityQueue(); test.enqueue(["David Brown", 2]); test.enqueue(["Jon Snow", 1]); var size1 = test.size(); test.dequeue(); var size2 = test.size(); test.enqueue(["A", 3]); test.enqueue(["B", 3]); test.enqueue(["C", 3]); return (size1 === 2 && size2 === 1 && test.size() === 4)}()), "Your PriorityQueue should correctly keep track of the current number of items using the <code>size</code> method as items are enqueued and dequeued.");'
+    testString: assert((function(){var test = new PriorityQueue(); test.enqueue(['David Brown', 2]); test.enqueue(['Jon Snow', 1]); var size1 = test.size(); test.dequeue(); var size2 = test.size(); test.enqueue(['A', 3]); test.enqueue(['B', 3]); test.enqueue(['C', 3]); return (size1 === 2 && size2 === 1 && test.size() === 4)}()), 'Your PriorityQueue should correctly keep track of the current number of items using the <code>size</code> method as items are enqueued and dequeued.');
   - text: The <code>isEmpty</code> method should return <code>true</code> when the queue is empty.
-    testString: 'assert((function(){var test = new PriorityQueue(); test.enqueue(["A", 1]); test.enqueue(["B", 1]); test.dequeue(); var first = test.isEmpty(); test.dequeue(); return (!first && test.isEmpty()); }()), "The <code>isEmpty</code> method should return <code>true</code> when the queue is empty.");'
+    testString: assert((function(){var test = new PriorityQueue(); test.enqueue(['A', 1]); test.enqueue(['B', 1]); test.dequeue(); var first = test.isEmpty(); test.dequeue(); return (!first && test.isEmpty()); }()), 'The <code>isEmpty</code> method should return <code>true</code> when the queue is empty.');
   - text: The priority queue should return items with a higher priority before items with a lower priority and return items in first-in-first-out order otherwise.
-    testString: 'assert((function(){var test = new PriorityQueue(); test.enqueue(["A", 5]); test.enqueue(["B", 5]); test.enqueue(["C", 5]); test.enqueue(["D", 3]); test.enqueue(["E", 1]); test.enqueue(["F", 7]); var result = []; result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); return result.join("") === "EDABCF";}()), "The priority queue should return items with a higher priority before items with a lower priority and return items in first-in-first-out order otherwise.");'
+    testString: assert((function(){var test = new PriorityQueue(); test.enqueue(['A', 5]); test.enqueue(['B', 5]); test.enqueue(['C', 5]); test.enqueue(['D', 3]); test.enqueue(['E', 1]); test.enqueue(['F', 7]); var result = []; result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); result.push(test.dequeue()); return result.join('') === 'EDABCF';}()), 'The priority queue should return items with a higher priority before items with a lower priority and return items in first-in-first-out order otherwise.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-queue-class.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-queue-class.english.md
index 342eba99fe..e4a9b2c531 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-queue-class.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-queue-class.english.md
@@ -24,23 +24,23 @@ Write an enqueue method that pushes an element to the tail of the queue, a deque
 ```yml
 tests:
   - text: Your <code>Queue</code> class should have a <code>enqueue</code> method.
-    testString: 'assert((function(){var test = new Queue();  return (typeof test.enqueue === "function")}()), "Your <code>Queue</code> class should have a <code>enqueue</code> method.");'
+    testString: assert((function(){var test = new Queue();  return (typeof test.enqueue === 'function')}()), 'Your <code>Queue</code> class should have a <code>enqueue</code> method.');
   - text: Your <code>Queue</code> class should have a <code>dequeue</code> method.
-    testString: 'assert((function(){var test = new Queue();  return (typeof test.dequeue === "function")}()), "Your <code>Queue</code> class should have a <code>dequeue</code> method.");'
+    testString: assert((function(){var test = new Queue();  return (typeof test.dequeue === 'function')}()), 'Your <code>Queue</code> class should have a <code>dequeue</code> method.');
   - text: Your <code>Queue</code> class should have a <code>front</code> method.
-    testString: 'assert((function(){var test = new Queue();  return (typeof test.front === "function")}()), "Your <code>Queue</code> class should have a <code>front</code> method.");'
+    testString: assert((function(){var test = new Queue();  return (typeof test.front === 'function')}()), 'Your <code>Queue</code> class should have a <code>front</code> method.');
   - text: Your <code>Queue</code> class should have a <code>size</code> method.
-    testString: 'assert((function(){var test = new Queue();  return (typeof test.size === "function")}()), "Your <code>Queue</code> class should have a <code>size</code> method.");'
+    testString: assert((function(){var test = new Queue();  return (typeof test.size === 'function')}()), 'Your <code>Queue</code> class should have a <code>size</code> method.');
   - text: Your <code>Queue</code> class should have an <code>isEmpty</code> method.
-    testString: 'assert((function(){var test = new Queue();  return (typeof test.isEmpty === "function")}()), "Your <code>Queue</code> class should have an <code>isEmpty</code> method.");'
+    testString: assert((function(){var test = new Queue();  return (typeof test.isEmpty === 'function')}()), 'Your <code>Queue</code> class should have an <code>isEmpty</code> method.');
   - text: The <code>dequeue</code> method should remove and return the front element of the queue
-    testString: 'assert((function(){var test = new Queue();  test.enqueue("Smith"); return (test.dequeue() === "Smith")}()), "The <code>dequeue</code> method should remove and return the front element of the queue");'
+    testString: assert((function(){var test = new Queue();  test.enqueue('Smith'); return (test.dequeue() === 'Smith')}()), 'The <code>dequeue</code> method should remove and return the front element of the queue');
   - text: The <code>front</code> method should return value of the front element of the queue
-    testString: 'assert((function(){var test = new Queue();  test.enqueue("Smith"); test.enqueue("John"); return (test.front() === "Smith")}()), "The <code>front</code> method should return value of the front element of the queue");'
+    testString: assert((function(){var test = new Queue();  test.enqueue('Smith'); test.enqueue('John'); return (test.front() === 'Smith')}()), 'The <code>front</code> method should return value of the front element of the queue');
   - text: The <code>size</code> method should return the length of the queue
-    testString: 'assert((function(){var test = new Queue();  test.enqueue("Smith"); return (test.size() === 1)}()), "The <code>size</code> method should return the length of the queue");'
+    testString: assert((function(){var test = new Queue();  test.enqueue('Smith'); return (test.size() === 1)}()), 'The <code>size</code> method should return the length of the queue');
   - text: The <code>isEmpty</code> method should return <code>false</code> if there are elements in the queue
-    testString: 'assert((function(){var test = new Queue();  test.enqueue("Smith"); return !(test.isEmpty())}()), "The <code>isEmpty</code> method should return <code>false</code> if there are elements in the queue");'
+    testString: assert((function(){var test = new Queue();  test.enqueue('Smith'); return !(test.isEmpty())}()), 'The <code>isEmpty</code> method should return <code>false</code> if there are elements in the queue');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-set-class.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-set-class.english.md
index 53c718568e..4a1bf3324d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-set-class.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-set-class.english.md
@@ -25,13 +25,13 @@ The function should return <code>true</code> if the value is successfully added
 ```yml
 tests:
   - text: Your <code>Set</code> class should have an <code>add</code> method.
-    testString: 'assert((function(){var test = new Set(); return (typeof test.add === "function")}()), "Your <code>Set</code> class should have an <code>add</code> method.");'
+    testString: assert((function(){var test = new Set(); return (typeof test.add === 'function')}()), 'Your <code>Set</code> class should have an <code>add</code> method.');
   - text: Your <code>add</code> method should not add duplicate values.
-    testString: 'assert((function(){var test = new Set(); test.add("a"); test.add("b"); test.add("a"); var vals = test.values(); return (vals[0] === "a" && vals[1] === "b" && vals.length === 2)}()), "Your <code>add</code> method should not add duplicate values.");'
+    testString: assert((function(){var test = new Set(); test.add('a'); test.add('b'); test.add('a'); var vals = test.values(); return (vals[0] === 'a' && vals[1] === 'b' && vals.length === 2)}()), 'Your <code>add</code> method should not add duplicate values.');
   - text: Your <code>add</code> method should return <code>true</code> when a value has been successfully added.
-    testString: 'assert((function(){var test = new Set(); var result = test.add("a"); return (result != undefined) && (result === true);}()), "Your <code>add</code> method should return <code>true</code> when a value has been successfully added.");'
+    testString: assert((function(){var test = new Set(); var result = test.add('a'); return (result != undefined) && (result === true);}()), 'Your <code>add</code> method should return <code>true</code> when a value has been successfully added.');
   - text: Your <code>add</code> method should return <code>false</code> when a duplicate value is added.
-    testString: 'assert((function(){var test = new Set(); test.add("a"); var result = test.add("a"); return (result != undefined) && (result === false);}()), "Your <code>add</code> method should return <code>false</code> when a duplicate value is added.");'
+    testString: assert((function(){var test = new Set(); test.add('a'); var result = test.add('a'); return (result != undefined) && (result === false);}()), 'Your <code>add</code> method should return <code>false</code> when a duplicate value is added.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-stack-class.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-stack-class.english.md
index 16351be102..f595c9421e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-stack-class.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-stack-class.english.md
@@ -25,23 +25,23 @@ Normally stacks don't have this, but we've added a <code>print</code> helper met
 ```yml
 tests:
   - text: Your <code>Stack</code> class should have a <code>push</code> method.
-    testString: 'assert((function(){var test = new Stack(); return (typeof test.push === "function")}()), "Your <code>Stack</code> class should have a <code>push</code> method.");'
+    testString: assert((function(){var test = new Stack(); return (typeof test.push === 'function')}()), 'Your <code>Stack</code> class should have a <code>push</code> method.');
   - text: Your <code>Stack</code> class should have a <code>pop</code> method.
-    testString: 'assert((function(){var test = new Stack(); return (typeof test.pop === "function")}()), "Your <code>Stack</code> class should have a <code>pop</code> method.");'
+    testString: assert((function(){var test = new Stack(); return (typeof test.pop === 'function')}()), 'Your <code>Stack</code> class should have a <code>pop</code> method.');
   - text: Your <code>Stack</code> class should have a <code>peek</code> method.
-    testString: 'assert((function(){var test = new Stack(); return (typeof test.peek === "function")}()), "Your <code>Stack</code> class should have a <code>peek</code> method.");'
+    testString: assert((function(){var test = new Stack(); return (typeof test.peek === 'function')}()), 'Your <code>Stack</code> class should have a <code>peek</code> method.');
   - text: Your <code>Stack</code> class should have a <code>isEmpty</code> method.
-    testString: 'assert((function(){var test = new Stack(); return (typeof test.isEmpty === "function")}()), "Your <code>Stack</code> class should have a <code>isEmpty</code> method.");'
+    testString: assert((function(){var test = new Stack(); return (typeof test.isEmpty === 'function')}()), 'Your <code>Stack</code> class should have a <code>isEmpty</code> method.');
   - text: Your <code>Stack</code> class should have a <code>clear</code> method.
-    testString: 'assert((function(){var test = new Stack(); return (typeof test.clear === "function")}()), "Your <code>Stack</code> class should have a <code>clear</code> method.");'
+    testString: assert((function(){var test = new Stack(); return (typeof test.clear === 'function')}()), 'Your <code>Stack</code> class should have a <code>clear</code> method.');
   - text: The <code>peek</code> method should return the top element of the stack
-    testString: 'assert((function(){var test = new Stack();  test.push("CS50"); return (test.peek() === "CS50")}()), "The <code>peek</code> method should return the top element of the stack");'
+    testString: assert((function(){var test = new Stack();  test.push('CS50'); return (test.peek() === 'CS50')}()), 'The <code>peek</code> method should return the top element of the stack');
   - text: The <code>pop</code> method should remove and return the top element of the stack
-    testString: 'assert((function(){var test = new Stack(); test.push("CS50"); return (test.pop() === "CS50");}()), "The <code>pop</code> method should remove and return the top element of the stack");'
+    testString: assert((function(){var test = new Stack(); test.push('CS50'); return (test.pop() === 'CS50');}()), 'The <code>pop</code> method should remove and return the top element of the stack');
   - text: The <code>isEmpty</code> method should return true if a stack does not contain any elements
-    testString: 'assert((function(){var test = new Stack(); return test.isEmpty()}()), "The <code>isEmpty</code> method should return true if a stack does not contain any elements");'
+    testString: assert((function(){var test = new Stack(); return test.isEmpty()}()), 'The <code>isEmpty</code> method should return true if a stack does not contain any elements');
   - text: The <code>clear</code> method should remove all element from the stack
-    testString: 'assert((function(){var test = new Stack();  test.push("CS50"); test.clear(); return (test.isEmpty())}()), "The <code>clear</code> method should remove all element from the stack");'
+    testString: assert((function(){var test = new Stack();  test.push('CS50'); test.clear(); return (test.isEmpty())}()), 'The <code>clear</code> method should remove all element from the stack');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-trie-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-trie-search-tree.english.md
index 70fd302881..ff00f87952 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-trie-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-trie-search-tree.english.md
@@ -24,15 +24,15 @@ In order for us to verify that this data structure is implemented correctly, we'
 ```yml
 tests:
   - text: The Trie has an add method.
-    testString: 'assert((function testTrie() { var test = false; if (typeof Trie !== "undefined") { test = new Trie() } else { return false; }; return (typeof test.add == "function") }()), "The Trie has an add method.");'
+    testString: assert((function testTrie() { var test = false; if (typeof Trie !== 'undefined') { test = new Trie() } else { return false; }; return (typeof test.add == 'function') }()), 'The Trie has an add method.');
   - text: The Trie has a print method.
-    testString: 'assert((function testTrie() { var test = false; if (typeof Trie !== "undefined") { test = new Trie() } else { return false; }; return (typeof test.print == "function") }()), "The Trie has a print method.");'
+    testString: assert((function testTrie() { var test = false; if (typeof Trie !== 'undefined') { test = new Trie() } else { return false; }; return (typeof test.print == 'function') }()), 'The Trie has a print method.');
   - text: The Trie has an isWord method.
-    testString: 'assert((function testTrie() { var test = false; if (typeof Trie !== "undefined") { test = new Trie() } else { return false; }; return (typeof test.isWord == "function") }()), "The Trie has an isWord method.");'
+    testString: assert((function testTrie() { var test = false; if (typeof Trie !== 'undefined') { test = new Trie() } else { return false; }; return (typeof test.isWord == 'function') }()), 'The Trie has an isWord method.');
   - text: The print method returns all items added to the trie as strings in an array.
-    testString: 'assert((function testTrie() { var test = false; if (typeof Trie !== "undefined") { test = new Trie() } else { return false; }; test.add("jump"); test.add("jumps"); test.add("jumped"); test.add("house"); test.add("mouse"); var added = test.print(); return (added.indexOf("jump") != -1 && added.indexOf("jumps") != -1 && added.indexOf("jumped") != -1 && added.indexOf("house") != -1 && added.indexOf("mouse") != -1 && added.length == 5); }()), "The print method returns all items added to the trie as strings in an array.");'
+    testString: assert((function testTrie() { var test = false; if (typeof Trie !== 'undefined') { test = new Trie() } else { return false; }; test.add('jump'); test.add('jumps'); test.add('jumped'); test.add('house'); test.add('mouse'); var added = test.print(); return (added.indexOf('jump') != -1 && added.indexOf('jumps') != -1 && added.indexOf('jumped') != -1 && added.indexOf('house') != -1 && added.indexOf('mouse') != -1 && added.length == 5); }()), 'The print method returns all items added to the trie as strings in an array.');
   - text: The isWord method returns true only for words added to the trie and false for all other words.
-    testString: 'assert((function testTrie() { var test = false; if (typeof Trie !== "undefined") { test = new Trie() } else { return false; }; test.add("hop"); test.add("hops"); test.add("hopped"); test.add("hoppy"); test.add("hope"); return (test.isWord("hop") && !test.isWord("ho") && test.isWord("hopped") && !test.isWord("hopp") && test.isWord("hoppy") && !test.isWord("hoping")); }()), "The isWord method returns true only for words added to the trie and false for all other words.");'
+    testString: assert((function testTrie() { var test = false; if (typeof Trie !== 'undefined') { test = new Trie() } else { return false; }; test.add('hop'); test.add('hops'); test.add('hopped'); test.add('hoppy'); test.add('hope'); return (test.isWord('hop') && !test.isWord('ho') && test.isWord('hopped') && !test.isWord('hopp') && test.isWord('hoppy') && !test.isWord('hoping')); }()), 'The isWord method returns true only for words added to the trie and false for all other words.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-an-es6-javascript-map.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-an-es6-javascript-map.english.md
index 76edddece0..5b61a0b70c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-an-es6-javascript-map.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-an-es6-javascript-map.english.md
@@ -28,9 +28,9 @@ Instructions: Define a JavaScript Map object and assign to it a variable called
 ```yml
 tests:
   - text: The myMap object exists.
-    testString: 'assert(typeof myMap === "object", "The myMap object exists.");'
-  - text: 'myMap contains the key value pair <code>freeCodeCamp</code>, <code>Awesome!</code>.'
-    testString: 'assert(myMap.get("freeCodeCamp") === "Awesome!", "myMap contains the key value pair <code>freeCodeCamp</code>, <code>Awesome!</code>.");'
+    testString: assert(typeof myMap === 'object', 'The myMap object exists.');
+  - text: myMap contains the key value pair <code>freeCodeCamp</code>, <code>Awesome!</code>.
+    testString: assert(myMap.get('freeCodeCamp') === 'Awesome!', 'myMap contains the key value pair <code>freeCodeCamp</code>, <code>Awesome!</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-and-add-to-sets-in-es6.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-and-add-to-sets-in-es6.english.md
index a3dc147fb9..e63c79373a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-and-add-to-sets-in-es6.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/create-and-add-to-sets-in-es6.english.md
@@ -29,8 +29,8 @@ For this exercise, return a set with the following values: <code>1, 2, 3, 'Taco'
 
 ```yml
 tests:
-  - text: 'Your <code>Set</code> should only contain the values <code>1, 2, 3, Taco, Cat, Awesome</code>.'
-    testString: 'assert(function(){var test = checkSet(); return (test.size == 6) && test.has(1) && test.has(2) && test.has(3) && test.has("Taco") && test.has("Cat") && test.has("Awesome");}, "Your <code>Set</code> should only contain the values <code>1, 2, 3, Taco, Cat, Awesome</code>.");'
+  - text: Your <code>Set</code> should only contain the values <code>1, 2, 3, Taco, Cat, Awesome</code>.
+    testString: assert(function(){var test = checkSet(); return (test.size == 6) && test.has(1) && test.has(2) && test.has(3) && test.has('Taco') && test.has('Cat') && test.has('Awesome');}, 'Your <code>Set</code> should only contain the values <code>1, 2, 3, Taco, Cat, Awesome</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-leaf-node-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-leaf-node-in-a-binary-search-tree.english.md
index 87ea60e868..f92bd9bc4b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-leaf-node-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-leaf-node-in-a-binary-search-tree.english.md
@@ -26,15 +26,15 @@ We will handle the second and third cases in the next challenges. Good luck!
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>remove</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == "function")})(), "The binary search tree has a method called <code>remove</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == 'function')})(), 'The binary search tree has a method called <code>remove</code>.');
   - text: Trying to remove an element that does not exist returns <code>null</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; return (test.remove(100) == null); })(), "Trying to remove an element that does not exist returns <code>null</code>.");'
-  - text: 'If the root node has no children, deleting it sets the root to <code>null</code>.'
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(500); test.remove(500); return (test.inorder() == null); })(), "If the root node has no children, deleting it sets the root to <code>null</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; return (test.remove(100) == null); })(), 'Trying to remove an element that does not exist returns <code>null</code>.');
+  - text: If the root node has no children, deleting it sets the root to <code>null</code>.
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(500); test.remove(500); return (test.inorder() == null); })(), 'If the root node has no children, deleting it sets the root to <code>null</code>.');
   - text: The <code>remove</code> method removes leaf nodes from the tree
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(5); test.add(3); test.add(7); test.add(6); test.add(10); test.add(12); test.remove(3); test.remove(12); test.remove(10); return (test.inorder().join("") == "567"); })(), "The <code>remove</code> method removes leaf nodes from the tree");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(5); test.add(3); test.add(7); test.add(6); test.add(10); test.add(12); test.remove(3); test.remove(12); test.remove(10); return (test.inorder().join('') == '567'); })(), 'The <code>remove</code> method removes leaf nodes from the tree');
 
 ```
 
@@ -66,7 +66,81 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    },
+    inorder: function() {
+        if (this.root == null) {
+          return null;
+        } else {
+          var result = new Array();
+          function traverseInOrder(node) {
+              if (node.left != null) {
+                  traverseInOrder(node.left);
+              };
+              result.push(node.value);
+              if (node.right != null) {
+                  traverseInOrder(node.right);
+              };
+          }
+          traverseInOrder(this.root);
+          return result;
+        };
+    },    
+    isBinarySearchTree() {
+        if (this.root == null) {
+            return null;
+        } else {
+            var check = true;
+            function checkTree(node) {
+                if (node.left != null) {
+                    var left = node.left;
+                    if (left.value > node.value) {
+                        check = false;
+                    } else {
+                        checkTree(left);
+                    }
+                }
+                if (node.right != null) {
+                    var right = node.right;
+                    if (right.value < node.value) {
+                        check = false;
+                    } else {
+                        checkTree(right);
+                    };
+                };
+            };
+            checkTree(this.root);
+            return check;
+        }
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-one-child-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-one-child-in-a-binary-search-tree.english.md
index 266066034f..94df686519 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-one-child-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-one-child-in-a-binary-search-tree.english.md
@@ -21,19 +21,19 @@ Instructions: We've provided some code in our <code>remove</code> method that ac
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>remove</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == "function")})(), "The binary search tree has a method called <code>remove</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == 'function')})(), 'The binary search tree has a method called <code>remove</code>.');
   - text: Trying to remove an element that does not exist returns <code>null</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; return (test.remove(100) == null); })(), "Trying to remove an element that does not exist returns <code>null</code>.");'
-  - text: 'If the root node has no children, deleting it sets the root to <code>null</code>.'
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(500); test.remove(500); return (test.inorder() == null); })(), "If the root node has no children, deleting it sets the root to <code>null</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; return (test.remove(100) == null); })(), 'Trying to remove an element that does not exist returns <code>null</code>.');
+  - text: If the root node has no children, deleting it sets the root to <code>null</code>.
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(500); test.remove(500); return (test.inorder() == null); })(), 'If the root node has no children, deleting it sets the root to <code>null</code>.');
   - text: The <code>remove</code> method removes leaf nodes from the tree
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(5); test.add(3); test.add(7); test.add(6); test.add(10); test.add(12); test.remove(3); test.remove(12); test.remove(10); return (test.inorder().join("") == "567"); })(), "The <code>remove</code> method removes leaf nodes from the tree");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(5); test.add(3); test.add(7); test.add(6); test.add(10); test.add(12); test.remove(3); test.remove(12); test.remove(10); return (test.inorder().join('') == '567'); })(), 'The <code>remove</code> method removes leaf nodes from the tree');
   - text: The <code>remove</code> method removes nodes with one child.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(-1); test.add(3); test.add(7); test.add(16); test.remove(16); test.remove(7); test.remove(3); return (test.inorder().join("") == "-1"); })(), "The <code>remove</code> method removes nodes with one child.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(-1); test.add(3); test.add(7); test.add(16); test.remove(16); test.remove(7); test.remove(3); return (test.inorder().join('') == '-1'); })(), 'The <code>remove</code> method removes nodes with one child.');
   - text: Removing the root in a tree with two nodes sets the second to be the root.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(15); test.add(27); test.remove(15); return (test.inorder().join("") == "27"); })(), "Removing the root in a tree with two nodes sets the second to be the root.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(15); test.add(27); test.remove(15); return (test.inorder().join('') == '27'); })(), 'Removing the root in a tree with two nodes sets the second to be the root.');
 
 ```
 
@@ -106,7 +106,81 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    },
+    inorder: function() {
+        if (this.root == null) {
+          return null;
+        } else {
+          var result = new Array();
+          function traverseInOrder(node) {
+              if (node.left != null) {
+                  traverseInOrder(node.left);
+              };
+              result.push(node.value);
+              if (node.right != null) {
+                  traverseInOrder(node.right);
+              };
+          }
+          traverseInOrder(this.root);
+          return result;
+        };
+    },    
+    isBinarySearchTree() {
+        if (this.root == null) {
+            return null;
+        } else {
+            var check = true;
+            function checkTree(node) {
+                if (node.left != null) {
+                    var left = node.left;
+                    if (left.value > node.value) {
+                        check = false;
+                    } else {
+                        checkTree(left);
+                    }
+                }
+                if (node.right != null) {
+                    var right = node.right;
+                    if (right.value < node.value) {
+                        check = false;
+                    } else {
+                        checkTree(right);
+                    };
+                };
+            };
+            checkTree(this.root);
+            return check;
+        }
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-two-children-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-two-children-in-a-binary-search-tree.english.md
index 5e72e2cf39..33bb315702 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-two-children-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/delete-a-node-with-two-children-in-a-binary-search-tree.english.md
@@ -22,23 +22,23 @@ Instructions: Let's finish our <code>remove</code> method by handling the third
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>remove</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == "function")})(), "The binary search tree has a method called <code>remove</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == 'function')})(), 'The binary search tree has a method called <code>remove</code>.');
   - text: Trying to remove an element that does not exist returns <code>null</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == "function") ? (test.remove(100) == null) : false})(), "Trying to remove an element that does not exist returns <code>null</code>.");'
-  - text: 'If the root node has no children, deleting it sets the root to <code>null</code>.'
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; test.add(500); test.remove(500); return (typeof test.remove == "function") ? (test.inorder() == null) : false})(), "If the root node has no children, deleting it sets the root to <code>null</code>.");'
+    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== ''undefined'') { test = new BinarySearchTree() } else { return false; }; return (typeof test.remove == ''function'') ? (test.remove(100) == null) : false})(), ''Trying to remove an element that does not exist returns <code>null</code>.'');'
+  - text: If the root node has no children, deleting it sets the root to <code>null</code>.
+    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== ''undefined'') { test = new BinarySearchTree() } else { return false; }; test.add(500); test.remove(500); return (typeof test.remove == ''function'') ? (test.inorder() == null) : false})(), ''If the root node has no children, deleting it sets the root to <code>null</code>.'');'
   - text: The <code>remove</code> method removes leaf nodes from the tree
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; test.add(5); test.add(3); test.add(7); test.add(6); test.add(10); test.add(12); test.remove(3); test.remove(12); test.remove(10); return (typeof test.remove == "function") ? (test.inorder().join("") == "567") : false})(), "The <code>remove</code> method removes leaf nodes from the tree");'
+    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== ''undefined'') { test = new BinarySearchTree() } else { return false; }; test.add(5); test.add(3); test.add(7); test.add(6); test.add(10); test.add(12); test.remove(3); test.remove(12); test.remove(10); return (typeof test.remove == ''function'') ? (test.inorder().join('''') == ''567'') : false})(), ''The <code>remove</code> method removes leaf nodes from the tree'');'
   - text: The <code>remove</code> method removes nodes with one child.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(-1); test.add(3); test.add(7); test.add(16); test.remove(16); test.remove(7); test.remove(3); return (test.inorder().join("") == "-1"); })(), "The <code>remove</code> method removes nodes with one child.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(-1); test.add(3); test.add(7); test.add(16); test.remove(16); test.remove(7); test.remove(3); return (test.inorder().join('') == '-1'); })(), 'The <code>remove</code> method removes nodes with one child.');
   - text: Removing the root in a tree with two nodes sets the second to be the root.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(15); test.add(27); test.remove(15); return (test.inorder().join("") == "27"); })(), "Removing the root in a tree with two nodes sets the second to be the root.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(15); test.add(27); test.remove(15); return (test.inorder().join('') == '27'); })(), 'Removing the root in a tree with two nodes sets the second to be the root.');
   - text: The <code>remove</code> method removes nodes with two children while maintaining the binary search tree structure.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(1); test.add(4); test.add(3); test.add(7); test.add(9); test.add(11); test.add(14); test.add(15); test.add(19); test.add(50); test.remove(9); if (!test.isBinarySearchTree()) { return false; }; test.remove(11); if (!test.isBinarySearchTree()) { return false; }; test.remove(14); if (!test.isBinarySearchTree()) { return false; }; test.remove(19); if (!test.isBinarySearchTree()) { return false; }; test.remove(3); if (!test.isBinarySearchTree()) { return false; }; test.remove(50); if (!test.isBinarySearchTree()) { return false; }; test.remove(15); if (!test.isBinarySearchTree()) { return false; }; return (test.inorder().join("") == "147"); })(), "The <code>remove</code> method removes nodes with two children while maintaining the binary search tree structure.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(1); test.add(4); test.add(3); test.add(7); test.add(9); test.add(11); test.add(14); test.add(15); test.add(19); test.add(50); test.remove(9); if (!test.isBinarySearchTree()) { return false; }; test.remove(11); if (!test.isBinarySearchTree()) { return false; }; test.remove(14); if (!test.isBinarySearchTree()) { return false; }; test.remove(19); if (!test.isBinarySearchTree()) { return false; }; test.remove(3); if (!test.isBinarySearchTree()) { return false; }; test.remove(50); if (!test.isBinarySearchTree()) { return false; }; test.remove(15); if (!test.isBinarySearchTree()) { return false; }; return (test.inorder().join('') == '147'); })(), 'The <code>remove</code> method removes nodes with two children while maintaining the binary search tree structure.');
   - text: The root can be removed on a tree of three nodes.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== "function") { return false; }; test.add(100); test.add(50); test.add(300); test.remove(100); return (test.inorder().join("") == 50300); })(), "The root can be removed on a tree of three nodes.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.remove !== 'function') { return false; }; test.add(100); test.add(50); test.add(300); test.remove(100); return (test.inorder().join('') == 50300); })(), 'The root can be removed on a tree of three nodes.');
 
 ```
 
@@ -125,7 +125,81 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    },
+    inorder: function() {
+        if (this.root == null) {
+          return null;
+        } else {
+          var result = new Array();
+          function traverseInOrder(node) {
+              if (node.left != null) {
+                  traverseInOrder(node.left);
+              };
+              result.push(node.value);
+              if (node.right != null) {
+                  traverseInOrder(node.right);
+              };
+          }
+          traverseInOrder(this.root);
+          return result;
+        };
+    },    
+    isBinarySearchTree() {
+        if (this.root == null) {
+            return null;
+        } else {
+            var check = true;
+            function checkTree(node) {
+                if (node.left != null) {
+                    var left = node.left;
+                    if (left.value > node.value) {
+                        check = false;
+                    } else {
+                        checkTree(left);
+                    }
+                }
+                if (node.right != null) {
+                    var right = node.right;
+                    if (right.value < node.value) {
+                        check = false;
+                    } else {
+                        checkTree(right);
+                    };
+                };
+            };
+            checkTree(this.root);
+            return check;
+        }
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/depth-first-search.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/depth-first-search.english.md
index 9b94483f61..15559e6db5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/depth-first-search.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/depth-first-search.english.md
@@ -25,22 +25,22 @@ Your function should output an array of all nodes reachable from <code>root</cod
 
 ```yml
 tests:
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with <code>0</code>, <code>1</code>, <code>2</code>, and <code>3</code>.'
-    testString: 'assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 1);})(), [0, 1, 2, 3], "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with <code>0</code>, <code>1</code>, <code>2</code>, and <code>3</code>.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with four elements.'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 1);})().length === 4, "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with four elements.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with <code>3</code>.'
-    testString: 'assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]; return dfs(graph, 3);})(), [3], "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with <code>3</code>.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with one element.'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]; return dfs(graph, 3);})().length === 1, "The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with one element.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with <code>2</code> and <code>3</code>.'
-    testString: 'assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 3);})(), [2, 3], "The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with <code>2</code> and <code>3</code>.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with two elements.'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 3);})().length === 2, "The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with two elements.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with <code>0</code> and <code>1</code>.'
-    testString: 'assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 0);})(), [0, 1], "The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with <code>0</code> and <code>1</code>.");'
-  - text: 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with two elements.'
-    testString: 'assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 0);})().length === 2, "The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with two elements.");'
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with <code>0</code>, <code>1</code>, <code>2</code>, and <code>3</code>.
+    testString: assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 1);})(), [0, 1, 2, 3], 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with <code>0</code>, <code>1</code>, <code>2</code>, and <code>3</code>.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with four elements.
+    testString: assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 1);})().length === 4, 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>1</code> should return an array with four elements.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with <code>3</code>.
+    testString: assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]; return dfs(graph, 3);})(), [3], 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with <code>3</code>.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with one element.
+    testString: assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]; return dfs(graph, 3);})().length === 1, 'The input graph <code>[[0, 1, 0, 0], [1, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 0]]</code> with a start node of <code>3</code> should return an array with one element.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with <code>2</code> and <code>3</code>.
+    testString: assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 3);})(), [2, 3], 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with <code>2</code> and <code>3</code>.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with two elements.
+    testString: assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 3);})().length === 2, 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>3</code> should return an array with two elements.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with <code>0</code> and <code>1</code>.
+    testString: assert.sameMembers((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 0);})(), [0, 1], 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with <code>0</code> and <code>1</code>.');
+  - text: The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with two elements.
+    testString: assert((function() { var graph = [[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]; return dfs(graph, 0);})().length === 2, 'The input graph <code>[[0, 1, 0, 0], [1, 0, 0, 0], [0, 0, 0, 1], [0, 0, 1, 0]]</code> with a start node of <code>0</code> should return an array with two elements.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-height-of-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-height-of-a-binary-search-tree.english.md
index e9cb2a4bc2..a5ec049c04 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-height-of-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-height-of-a-binary-search-tree.english.md
@@ -23,21 +23,21 @@ Instructions: Write two methods for our binary tree: <code>findMinHeight</code>
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>findMinHeight</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMinHeight == "function")})(), "The binary search tree has a method called <code>findMinHeight</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMinHeight == 'function')})(), 'The binary search tree has a method called <code>findMinHeight</code>.');
   - text: The binary search tree has a method called <code>findMaxHeight</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMaxHeight == "function")})(), "The binary search tree has a method called <code>findMaxHeight</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMaxHeight == 'function')})(), 'The binary search tree has a method called <code>findMaxHeight</code>.');
   - text: The binary search tree has a method called <code>isBalanced</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.isBalanced == "function")})(), "The binary search tree has a method called <code>isBalanced</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.isBalanced == 'function')})(), 'The binary search tree has a method called <code>isBalanced</code>.');
   - text: The <code>findMinHeight</code> method returns the minimum height of the tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMinHeight !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return (test.findMinHeight() == 1); })(), "The <code>findMinHeight</code> method returns the minimum height of the tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMinHeight !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return (test.findMinHeight() == 1); })(), 'The <code>findMinHeight</code> method returns the minimum height of the tree.');
   - text: The <code>findMaxHeight</code> method returns the maximum height of the tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMaxHeight !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return (test.findMaxHeight() == 5); })(), "The <code>findMaxHeight</code> method returns the maximum height of the tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMaxHeight !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return (test.findMaxHeight() == 5); })(), 'The <code>findMaxHeight</code> method returns the maximum height of the tree.');
   - text: An empty tree returns a height of <code>-1</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMaxHeight !== "function") { return false; }; return (test.findMaxHeight() == -1); })(), "An empty tree returns a height of <code>-1</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMaxHeight !== 'function') { return false; }; return (test.findMaxHeight() == -1); })(), 'An empty tree returns a height of <code>-1</code>.');
   - text: The <code>isBalanced</code> method returns true if the tree is a balanced binary search tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.isBalanced !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return test.isBalanced(); })(), "The <code>isBalanced</code> method returns true if the tree is a balanced binary search tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.isBalanced !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return test.isBalanced(); })(), 'The <code>isBalanced</code> method returns true if the tree is a balanced binary search tree.');
 
 ```
 
@@ -69,7 +69,36 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-value-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-value-in-a-binary-search-tree.english.md
index 04206d5f48..7810c971b2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-value-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/find-the-minimum-and-maximum-value-in-a-binary-search-tree.english.md
@@ -26,17 +26,17 @@ Instructions: We'll start simple. We've defined the skeleton of a binary search
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>findMin</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMin == "function")})(), "The binary search tree has a method called <code>findMin</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMin == 'function')})(), 'The binary search tree has a method called <code>findMin</code>.');
   - text: The binary search tree has a method called <code>findMax</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMax == "function")})(), "The binary search tree has a method called <code>findMax</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.findMax == 'function')})(), 'The binary search tree has a method called <code>findMax</code>.');
   - text: The <code>findMin</code> method returns the minimum value in the binary search tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMin !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return test.findMin() == 1; })(), "The <code>findMin</code> method returns the minimum value in the binary search tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMin !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return test.findMin() == 1; })(), 'The <code>findMin</code> method returns the minimum value in the binary search tree.');
   - text: The <code>findMax</code> method returns the maximum value in the binary search tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMax !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return test.findMax() == 87; })(), "The <code>findMax</code> method returns the maximum value in the binary search tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMax !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); return test.findMax() == 87; })(), 'The <code>findMax</code> method returns the maximum value in the binary search tree.');
   - text: The <code>findMin</code> and <code>findMax</code> methods return <code>null</code> for an empty tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMin !== "function") { return false; }; if (typeof test.findMax !== "function") { return false; }; return (test.findMin() == null && test.findMax() == null) })(), "The <code>findMin</code> and <code>findMax</code> methods return <code>null</code> for an empty tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.findMin !== 'function') { return false; }; if (typeof test.findMax !== 'function') { return false; }; return (test.findMin() == null && test.findMax() == null) })(), 'The <code>findMin</code> and <code>findMax</code> methods return <code>null</code> for an empty tree.');
 
 ```
 
@@ -68,7 +68,36 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/implement-heap-sort-with-a-min-heap.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/implement-heap-sort-with-a-min-heap.english.md
index eb69fe90c4..6b88755369 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/implement-heap-sort-with-a-min-heap.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/implement-heap-sort-with-a-min-heap.english.md
@@ -22,15 +22,15 @@ Instructions: Let's implement heap sort with a min heap. Feel free to adapt your
 ```yml
 tests:
   - text: The MinHeap data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof MinHeap !== "undefined") { test = new MinHeap() }; return (typeof test == "object")})(), "The MinHeap data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof MinHeap !== 'undefined') { test = new MinHeap() }; return (typeof test == 'object')})(), 'The MinHeap data structure exists.');
   - text: MinHeap has a method called insert.
-    testString: 'assert((function() { var test = false; if (typeof MinHeap !== "undefined") { test = new MinHeap() } else { return false; }; return (typeof test.insert == "function")})(), "MinHeap has a method called insert.");'
+    testString: assert((function() { var test = false; if (typeof MinHeap !== 'undefined') { test = new MinHeap() } else { return false; }; return (typeof test.insert == 'function')})(), 'MinHeap has a method called insert.');
   - text: MinHeap has a method called remove.
-    testString: 'assert((function() { var test = false; if (typeof MinHeap !== "undefined") { test = new MinHeap() } else { return false; }; return (typeof test.remove == "function")})(), "MinHeap has a method called remove.");'
+    testString: assert((function() { var test = false; if (typeof MinHeap !== 'undefined') { test = new MinHeap() } else { return false; }; return (typeof test.remove == 'function')})(), 'MinHeap has a method called remove.');
   - text: MinHeap has a method called sort.
-    testString: 'assert((function() { var test = false; if (typeof MinHeap !== "undefined") { test = new MinHeap() } else { return false; }; return (typeof test.sort == "function")})(), "MinHeap has a method called sort.");'
+    testString: assert((function() { var test = false; if (typeof MinHeap !== 'undefined') { test = new MinHeap() } else { return false; }; return (typeof test.sort == 'function')})(), 'MinHeap has a method called sort.');
   - text: The sort method returns an array containing all items added to the min heap in sorted order.
-    testString: 'assert((function() { var test = false; if (typeof MinHeap !== "undefined") { test = new MinHeap() } else { return false; }; test.insert(3); test.insert(12); test.insert(5); test.insert(10); test.insert(1); test.insert(27); test.insert(42); test.insert(57); test.insert(5); var result = test.sort(); return (isSorted(result)); })(), "The sort method returns an array containing all items added to the min heap in sorted order.");'
+    testString: assert((function() { var test = false; if (typeof MinHeap !== 'undefined') { test = new MinHeap() } else { return false; }; test.insert(3); test.insert(12); test.insert(5); test.insert(10); test.insert(1); test.insert(27); test.insert(42); test.insert(57); test.insert(5); var result = test.sort(); return (isSorted(result)); })(), 'The sort method returns an array containing all items added to the min heap in sorted order.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/incidence-matrix.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/incidence-matrix.english.md
index 4b3fb10c64..8cf310cec4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/incidence-matrix.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/incidence-matrix.english.md
@@ -32,15 +32,15 @@ These five nodes have relationships following relationships. The first edge is b
 ```yml
 tests:
   - text: <code>incMatUndirected</code> should only contain five nodes.
-    testString: 'assert((incMatUndirected.length === 5) && incMatUndirected.map(function(x) { return x.length === 4 }).reduce(function(a, b) { return a && b }) , "<code>incMatUndirected</code> should only contain five nodes.");'
+    testString: assert((incMatUndirected.length === 5) && incMatUndirected.map(function(x) { return x.length === 4 }).reduce(function(a, b) { return a && b }) , '<code>incMatUndirected</code> should only contain five nodes.');
   - text: There should be a first edge between the first and second node.
-    testString: 'assert((incMatUndirected[0][0] === 1) && (incMatUndirected[1][0] === 1), "There should be a first edge between the first and second node.");'
+    testString: assert((incMatUndirected[0][0] === 1) && (incMatUndirected[1][0] === 1), 'There should be a first edge between the first and second node.');
   - text: There should be a second edge between the second and third node.
-    testString: 'assert((incMatUndirected[1][1] === 1) && (incMatUndirected[2][1] === 1), "There should be a second edge between the second and third node.");'
+    testString: assert((incMatUndirected[1][1] === 1) && (incMatUndirected[2][1] === 1), 'There should be a second edge between the second and third node.');
   - text: There should be a third edge between the third and fifth node.
-    testString: 'assert((incMatUndirected[2][2] === 1) && (incMatUndirected[4][2] === 1), "There should be a third edge between the third and fifth node.");'
+    testString: assert((incMatUndirected[2][2] === 1) && (incMatUndirected[4][2] === 1), 'There should be a third edge between the third and fifth node.');
   - text: There should be a fourth edge between the second and fourth node.
-    testString: 'assert((incMatUndirected[1][3] === 1) && (incMatUndirected[3][3] === 1), "There should be a fourth edge between the second and fourth node.");'
+    testString: assert((incMatUndirected[1][3] === 1) && (incMatUndirected[3][3] === 1), 'There should be a fourth edge between the second and fourth node.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/insert-an-element-into-a-max-heap.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/insert-an-element-into-a-max-heap.english.md
index 5a8813b96d..80c1b5a319 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/insert-an-element-into-a-max-heap.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/insert-an-element-into-a-max-heap.english.md
@@ -35,13 +35,13 @@ Finally, add a print method which returns an array of all the items that have be
 ```yml
 tests:
   - text: The MaxHeap data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() }; return (typeof test == "object")})(), "The MaxHeap data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() }; return (typeof test == 'object')})(), 'The MaxHeap data structure exists.');
   - text: MaxHeap has a method called insert.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; return (typeof test.insert == "function")})(), "MaxHeap has a method called insert.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() } else { return false; }; return (typeof test.insert == 'function')})(), 'MaxHeap has a method called insert.');
   - text: MaxHeap has a method called print.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; return (typeof test.print == "function")})(), "MaxHeap has a method called print.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() } else { return false; }; return (typeof test.print == 'function')})(), 'MaxHeap has a method called print.');
   - text: The insert method adds elements according to the max heap property.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; test.insert(50); test.insert(100); test.insert(700); test.insert(32); test.insert(51); let result = test.print(); return ((result.length == 5) ? result[0] == 700 : result[1] == 700) })(), "The insert method adds elements according to the max heap property.");'
+    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== ''undefined'') { test = new MaxHeap() } else { return false; }; test.insert(50); test.insert(100); test.insert(700); test.insert(32); test.insert(51); let result = test.print(); return ((result.length == 5) ? result[0] == 700 : result[1] == 700) })(), ''The insert method adds elements according to the max heap property.'');'
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/invert-a-binary-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/invert-a-binary-tree.english.md
index ebc2f1284d..812c538d4d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/invert-a-binary-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/invert-a-binary-tree.english.md
@@ -20,13 +20,13 @@ Here will we create a function to invert a binary tree. Given a binary tree, we
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>invert</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.invert == "function")})(), "The binary search tree has a method called <code>invert</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.invert == 'function')})(), 'The binary search tree has a method called <code>invert</code>.');
   - text: The <code>invert</code> method correctly inverts the tree structure.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.invert !== "function") { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); test.invert(); return test.inorder().join("") == "877345348741"; })(), "The <code>invert</code> method correctly inverts the tree structure.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.invert !== 'function') { return false; }; test.add(4); test.add(1); test.add(7); test.add(87); test.add(34); test.add(45); test.add(73); test.add(8); test.invert(); return test.inorder().join('') == '877345348741'; })(), 'The <code>invert</code> method correctly inverts the tree structure.');
   - text: Inverting an empty tree returns <code>null</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.invert !== "function") { return false; }; return (test.invert() == null); })(), "Inverting an empty tree returns <code>null</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.invert !== 'function') { return false; }; return (test.invert() == null); })(), 'Inverting an empty tree returns <code>null</code>.');
 
 ```
 
@@ -58,7 +58,54 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    },
+    inorder: function() {
+        if (this.root == null) {
+          return null;
+        } else {
+          var result = new Array();
+          function traverseInOrder(node) {
+              if (node.left != null) {
+                  traverseInOrder(node.left);
+              };
+              result.push(node.value);
+              if (node.right != null) {
+                  traverseInOrder(node.right);
+              };
+          }
+          traverseInOrder(this.root);
+          return result;
+        };
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/learn-how-a-stack-works.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/learn-how-a-stack-works.english.md
index 092dfd78d0..9b634f9edc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/learn-how-a-stack-works.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/learn-how-a-stack-works.english.md
@@ -25,13 +25,13 @@ Modify the given array and treat it like a <code>stack</code> using the JavaScri
 ```yml
 tests:
   - text: <code>homeworkStack</code> should only contain 4 elements.
-    testString: 'assert(homeworkStack.length === 4, "<code>homeworkStack</code> should only contain 4 elements.");'
+    testString: assert(homeworkStack.length === 4, '<code>homeworkStack</code> should only contain 4 elements.');
   - text: The last element in <code>homeworkStack</code> should be <code>"CS50"</code>.
-    testString: 'assert(homeworkStack[3] === "CS50", "The last element in <code>homeworkStack</code> should be <code>"CS50"</code>.");'
+    testString: assert(homeworkStack[3] === 'CS50', 'The last element in <code>homeworkStack</code> should be <code>"CS50"</code>.');
   - text: <code>homeworkStack</code> should not contain <code>"PSY44"</code>.
-    testString: 'assert(homeworkStack.indexOf("PSY44") === -1, "<code>homeworkStack</code> should not contain <code>"PSY44"</code>.");'
+    testString: assert(homeworkStack.indexOf('PSY44') === -1, '<code>homeworkStack</code> should not contain <code>"PSY44"</code>.');
   - text: The initial declaration of the <code>homeworkStack</code> should not be changed.
-    testString: 'assert(code.match(/=/g).length === 1 && /homeworkStack\s*=\s*\["BIO12"\s*,\s*"HIS80"\s*,\s*"MAT122"\s*,\s*"PSY44"\]/.test(code), "The initial declaration of the <code>homeworkStack</code> should not be changed.");'
+    testString: assert(code.match(/=/g).length === 1 && /homeworkStack\s*=\s*\["BIO12"\s*,\s*"HIS80"\s*,\s*"MAT122"\s*,\s*"PSY44"\]/.test(code), 'The initial declaration of the <code>homeworkStack</code> should not be changed.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-difference-on-two-sets-of-data.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-difference-on-two-sets-of-data.english.md
index ab2ab46b51..fb3889b75a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-difference-on-two-sets-of-data.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-difference-on-two-sets-of-data.english.md
@@ -21,9 +21,9 @@ For example, if <code>setA = ['a','b','c']</code> and <code>setB = ['a','b','d',
 ```yml
 tests:
   - text: Your <code>Set</code> class should have a <code>difference</code> method.
-    testString: 'assert(function(){var test = new Set(); return (typeof test.difference === "function")}, "Your <code>Set</code> class should have a <code>difference</code> method.");'
+    testString: assert(function(){var test = new Set(); return (typeof test.difference === 'function')}, 'Your <code>Set</code> class should have a <code>difference</code> method.');
   - text: The proper collection was returned
-    testString: 'assert(function(){var setA = new Set(); var setB = new Set(); setA.add("a"); setA.add("b"); setA.add("c"); setB.add("c"); setB.add("d"); var differenceSetAB = setA.difference(setB); return (differenceSetAB.size() === 2) && (differenceSetAB.values() === [ "a", "b" ])}, "The proper collection was returned");'
+    testString: assert(function(){var setA = new Set(); var setB = new Set(); setA.add('a'); setA.add('b'); setA.add('c'); setB.add('c'); setB.add('d'); var differenceSetAB = setA.difference(setB); return (differenceSetAB.size() === 2) && (differenceSetAB.values() === [ 'a', 'b' ])}, 'The proper collection was returned');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-subset-check-on-two-sets-of-data.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-subset-check-on-two-sets-of-data.english.md
index bb67b764c6..19ff2d7f4e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-subset-check-on-two-sets-of-data.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-subset-check-on-two-sets-of-data.english.md
@@ -21,17 +21,17 @@ For example, if <code>setA = ['a','b']</code> and <code>setB = ['a','b','c','d']
 ```yml
 tests:
   - text: Your <code>Set</code> class should have a <code>union</code> method.
-    testString: 'assert(function(){var test = new Set(); return (typeof test.subset === "function")}, "Your <code>Set</code> class should have a <code>union</code> method.");'
+    testString: assert(function(){var test = new Set(); return (typeof test.subset === 'function')}, 'Your <code>Set</code> class should have a <code>union</code> method.');
   - text: The first Set() was contained in the second Set
-    testString: 'assert(function(){var setA = new Set(); var setB = new Set(); setA.add("a"); setB.add("b"); setB.add("c"); setB.add("a"); setB.add("d"); var subsetSetAB = setA.subset(setB);return (subsetSetAB === true)}, "The first Set() was contained in the second Set");'
-  - text: '<code>["a", "b"].subset(["a", "b", "c", "d"])</code> should return <code>true</code>")'
-    testString: 'assert(function(){var setA = new Set(); var setB = new Set(); setA.add("a"); setA.add("b"); setB.add("a"); setB.add("b"); setB.add("c"); setB.add("d"); var subsetSetAB = setA.subset(setB); return (subsetSetAB === true)}, "<code>["a", "b"].subset(["a", "b", "c", "d"])</code> should return <code>true</code>");'
-  - text: '<code>["a", "b", "c"].subset(["a", "b"])</code> should return <code>false</code>")'
-    testString: 'assert(function(){var setA = new Set(); var setB = new Set(); setA.add("a"); setA.add("b"); setA.add("c"); setB.add("a"); setB.add("b"); var subsetSetAB = setA.subset(setB); return (subsetSetAB === false)}, "<code>["a", "b", "c"].subset(["a", "b"])</code> should return <code>false</code>");'
-  - text: '<code>[].subset([])</code> should return <code>true</code>'
-    testString: 'assert(function(){var setA = new Set(); var setB = new Set(); var subsetSetAB = setA.subset(setB); return (subsetSetAB === true)}, "<code>[].subset([])</code> should return <code>true</code>");'
-  - text: '<code>["a", "b"].subset(["c", "d"])</code> should return <code>false</code>")'
-    testString: 'assert(function(){var setA = new Set(); var setB = new Set(); setA.add("a"); setA.add("b"); setB.add("c"); setB.add("d"); var subsetSetAB = setA.subset(setB); return (subsetSetAB === false)}, "<code>["a", "b"].subset(["c", "d"])</code> should return <code>false</code>");'
+    testString: assert(function(){var setA = new Set(); var setB = new Set(); setA.add('a'); setB.add('b'); setB.add('c'); setB.add('a'); setB.add('d'); var subsetSetAB = setA.subset(setB);return (subsetSetAB === true)}, 'The first Set() was contained in the second Set');
+  - text: <code>['a', 'b'].subset(['a', 'b', 'c', 'd'])</code> should return <code>true</code>")
+    testString: assert(function(){var setA = new Set(); var setB = new Set(); setA.add('a'); setA.add('b'); setB.add('a'); setB.add('b'); setB.add('c'); setB.add('d'); var subsetSetAB = setA.subset(setB); return (subsetSetAB === true)}, "<code>['a', 'b'].subset(['a', 'b', 'c', 'd'])</code> should return <code>true</code>");
+  - text: <code>['a', 'b', 'c'].subset(['a', 'b'])</code> should return <code>false</code>")
+    testString: assert(function(){var setA = new Set(); var setB = new Set(); setA.add('a'); setA.add('b'); setA.add('c'); setB.add('a'); setB.add('b'); var subsetSetAB = setA.subset(setB); return (subsetSetAB === false)}, "<code>['a', 'b', 'c'].subset(['a', 'b'])</code> should return <code>false</code>");
+  - text: <code>[].subset([])</code> should return <code>true</code>
+    testString: assert(function(){var setA = new Set(); var setB = new Set(); var subsetSetAB = setA.subset(setB); return (subsetSetAB === true)}, '<code>[].subset([])</code> should return <code>true</code>');
+  - text: <code>['a', 'b'].subset(['c', 'd'])</code> should return <code>false</code>")
+    testString: assert(function(){var setA = new Set(); var setB = new Set(); setA.add('a'); setA.add('b'); setB.add('c'); setB.add('d'); var subsetSetAB = setA.subset(setB); return (subsetSetAB === false)}, "<code>['a', 'b'].subset(['c', 'd'])</code> should return <code>false</code>");
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-union-on-two-sets.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-union-on-two-sets.english.md
index 232b96349f..bd906dbb54 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-union-on-two-sets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-a-union-on-two-sets.english.md
@@ -21,9 +21,9 @@ For example, if <code>setA = ['a','b','c']</code> and <code>setB = ['a','b','d',
 ```yml
 tests:
   - text: Your <code>Set</code> class should have a <code>union</code> method.
-    testString: 'assert((function(){var test = new Set(); return (typeof test.union === "function")})(), "Your <code>Set</code> class should have a <code>union</code> method.");'
+    testString: assert((function(){var test = new Set(); return (typeof test.union === 'function')})(), 'Your <code>Set</code> class should have a <code>union</code> method.');
   - text: The proper collection was returned
-    testString: 'assert((function(){var setA = new Set();  var setB = new Set();  setA.add("a");  setA.add("b");  setA.add("c");  setB.add("c");  setB.add("d");  var unionSetAB = setA.union(setB); var final = unionSetAB.values(); return (final.indexOf("a") !== -1 && final.indexOf("b") !== -1 && final.indexOf("c") !== -1 && final.indexOf("d") !== -1 && final.length === 4)})(), "The proper collection was returned");'
+    testString: assert((function(){var setA = new Set();  var setB = new Set();  setA.add('a');  setA.add('b');  setA.add('c');  setB.add('c');  setB.add('d');  var unionSetAB = setA.union(setB); var final = unionSetAB.values(); return (final.indexOf('a') !== -1 && final.indexOf('b') !== -1 && final.indexOf('c') !== -1 && final.indexOf('d') !== -1 && final.length === 4)})(), 'The proper collection was returned');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-an-intersection-on-two-sets-of-data.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-an-intersection-on-two-sets-of-data.english.md
index c2933543c2..8216b245ca 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-an-intersection-on-two-sets-of-data.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/perform-an-intersection-on-two-sets-of-data.english.md
@@ -21,9 +21,9 @@ For example, if <code>setA = ['a','b','c']</code> and <code>setB = ['a','b','d',
 ```yml
 tests:
   - text: Your <code>Set</code> class should have a <code>intersection</code> method.
-    testString: 'assert(function(){var test = new Set(); return (typeof test.intersection === "function")}, "Your <code>Set</code> class should have a <code>intersection</code> method.");'
+    testString: assert(function(){var test = new Set(); return (typeof test.intersection === 'function')}, 'Your <code>Set</code> class should have a <code>intersection</code> method.');
   - text: The proper collection was returned
-    testString: 'assert(function(){  var setA = new Set();  var setB = new Set();  setA.add("a");  setA.add("b");  setA.add("c");  setB.add("c");  setB.add("d");  var intersectionSetAB = setA.intersection(setB); return (intersectionSetAB.size() === 1 && intersectionSetAB.values()[0] === "c")}, "The proper collection was returned");'
+    testString: assert(function(){  var setA = new Set();  var setB = new Set();  setA.add('a');  setA.add('b');  setA.add('c');  setB.add('c');  setB.add('d');  var intersectionSetAB = setA.intersection(setB); return (intersectionSetAB.size() === 1 && intersectionSetAB.values()[0] === 'c')}, 'The proper collection was returned');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-an-element-from-a-max-heap.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-an-element-from-a-max-heap.english.md
index 1ad3263cfc..a9b58cad35 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-an-element-from-a-max-heap.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-an-element-from-a-max-heap.english.md
@@ -24,15 +24,15 @@ Instructions: Add a method to our max heap called remove. This method should ret
 ```yml
 tests:
   - text: The MaxHeap data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() }; return (typeof test == "object")})(), "The MaxHeap data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() }; return (typeof test == 'object')})(), 'The MaxHeap data structure exists.');
   - text: MaxHeap has a method called print.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; return (typeof test.print == "function")})(), "MaxHeap has a method called print.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() } else { return false; }; return (typeof test.print == 'function')})(), 'MaxHeap has a method called print.');
   - text: MaxHeap has a method called insert.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; return (typeof test.insert == "function")})(), "MaxHeap has a method called insert.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() } else { return false; }; return (typeof test.insert == 'function')})(), 'MaxHeap has a method called insert.');
   - text: MaxHeap has a method called remove.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; return (typeof test.remove == "function")})(), "MaxHeap has a method called remove.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() } else { return false; }; return (typeof test.remove == 'function')})(), 'MaxHeap has a method called remove.');
   - text: The remove method removes the greatest element from the max heap while maintaining the max heap property.
-    testString: 'assert((function() { var test = false; if (typeof MaxHeap !== "undefined") { test = new MaxHeap() } else { return false; }; test.insert(30); test.insert(300); test.insert(500); test.insert(10); let result = []; result.push(test.remove()); result.push(test.remove()); result.push(test.remove()); result.push(test.remove());  return (result.join("") == "5003003010") })(), "The remove method removes the greatest element from the max heap while maintaining the max heap property.");'
+    testString: assert((function() { var test = false; if (typeof MaxHeap !== 'undefined') { test = new MaxHeap() } else { return false; }; test.insert(30); test.insert(300); test.insert(500); test.insert(10); let result = []; result.push(test.remove()); result.push(test.remove()); result.push(test.remove()); result.push(test.remove());  return (result.join('') == '5003003010') })(), 'The remove method removes the greatest element from the max heap while maintaining the max heap property.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list-by-index.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list-by-index.english.md
index 646b441063..919d60bb3c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list-by-index.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list-by-index.english.md
@@ -25,15 +25,15 @@ Remember to keep count of the <code>currentIndex</code>.
 ```yml
 tests:
   - text: Your <code>LinkedList</code> class should have a <code>removeAt</code> method.
-    testString: 'assert((function(){var test = new LinkedList(); return (typeof test.removeAt === "function")}()), "Your <code>LinkedList</code> class should have a <code>removeAt</code> method.");'
+    testString: assert((function(){var test = new LinkedList(); return (typeof test.removeAt === 'function')}()), 'Your <code>LinkedList</code> class should have a <code>removeAt</code> method.');
   - text: Your <code>removeAt</code> method should reduce the <code>length</code> of the linked list
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten"); test.removeAt(1); return test.size() === 2}()), "Your <code>removeAt</code> method should reduce the <code>length</code> of the linked list");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten'); test.removeAt(1); return test.size() === 2}()), 'Your <code>removeAt</code> method should reduce the <code>length</code> of the linked list');
   - text: Your <code>removeAt</code> method should also return the element of the removed node.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten");  return test.removeAt(1) === "dog"}()), "Your <code>removeAt</code> method should also return the element of the removed node.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten');  return test.removeAt(1) === 'dog'}()), 'Your <code>removeAt</code> method should also return the element of the removed node.');
   - text: Your <code>removeAt</code> method should also return <code>null</code> if the given index is less than <code>0</code>
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten");  return (test.removeAt(-1) === null)}()), "Your <code>removeAt</code> method should also return <code>null</code> if the given index is less than <code>0</code>");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten');  return (test.removeAt(-1) === null)}()), 'Your <code>removeAt</code> method should also return <code>null</code> if the given index is less than <code>0</code>');
   - text: Your <code>removeAt</code> method should also return <code>null</code> if the given index is equal or more than the <code>length</code> of the linked list.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten");  return (test.removeAt(3) === null)}()), "Your <code>removeAt</code> method should also return <code>null</code> if the given index is equal or more than the <code>length</code> of the linked list.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten');  return (test.removeAt(3) === null)}()), 'Your <code>removeAt</code> method should also return <code>null</code> if the given index is equal or more than the <code>length</code> of the linked list.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list.english.md
index 68afd57186..a3cc765611 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-elements-from-a-linked-list.english.md
@@ -25,13 +25,13 @@ The <code>length</code> of the list should decrease by one every time an element
 ```yml
 tests:
   - text: Your <code>LinkedList</code> class should have a <code>remove</code> method.
-    testString: 'assert((function(){var test = new LinkedList(); return (typeof test.remove === "function")}()), "Your <code>LinkedList</code> class should have a <code>remove</code> method.");'
+    testString: assert((function(){var test = new LinkedList(); return (typeof test.remove === 'function')}()), 'Your <code>LinkedList</code> class should have a <code>remove</code> method.');
   - text: Your <code>remove</code> method should reassign <code>head</code> to the second node when the first node is removed.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.remove("cat"); return test.head().element === "dog"}()), "Your <code>remove</code> method should reassign <code>head</code> to the second node when the first node is removed.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.remove('cat'); return test.head().element === 'dog'}()), 'Your <code>remove</code> method should reassign <code>head</code> to the second node when the first node is removed.');
   - text: Your <code>remove</code> method should decrease the <code>length</code> of the linked list by one for every node removed.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.remove("cat"); return test.size() === 1})(), "Your <code>remove</code> method should decrease the <code>length</code> of the linked list by one for every node removed.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.remove('cat'); return test.size() === 1})(), 'Your <code>remove</code> method should decrease the <code>length</code> of the linked list by one for every node removed.');
   - text: Your <code>remove</code> method should reassign the reference of the previous node of the removed node to the removed node&apos;s <code>next</code> reference.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog");test.add("kitten"); test.remove("dog"); return test.head().next.element === "kitten"})(), "Your <code>remove</code> method should reassign the reference of the previous node of the removed node to the removed node&apos;s <code>next</code> reference.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog');test.add('kitten'); test.remove('dog'); return test.head().next.element === 'kitten'})(), 'Your <code>remove</code> method should reassign the reference of the previous node of the removed node to the removed node&apos;s <code>next</code> reference.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-from-a-set.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-from-a-set.english.md
index 76fc65ddde..5bba29e269 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-from-a-set.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-from-a-set.english.md
@@ -20,11 +20,11 @@ In this exercises we are going to create a delete function for our set. The func
 ```yml
 tests:
   - text: Your <code>Set</code> class should have a <code>remove</code> method.
-    testString: 'assert((function(){var test = new Set(); return (typeof test.remove === "function")}()), "Your <code>Set</code> class should have a <code>remove</code> method.");'
+    testString: assert((function(){var test = new Set(); return (typeof test.remove === 'function')}()), 'Your <code>Set</code> class should have a <code>remove</code> method.');
   - text: Your <code>remove</code> method should only remove items that are present in the set.
-    testString: 'assert.deepEqual((function(){var test = new Set(); test.add("a");test.add("b");test.remove("c"); return test.values(); })(), ["a", "b"], "Your <code>remove</code> method should only remove items that are present in the set.");'
+    testString: assert.deepEqual((function(){var test = new Set(); test.add('a');test.add('b');test.remove('c'); return test.values(); })(), ['a', 'b'], 'Your <code>remove</code> method should only remove items that are present in the set.');
   - text: Your <code>remove</code> method should remove the given item from the set.
-    testString: 'assert((function(){var test = new Set(); test.add("a");test.add("b");test.remove("a"); var vals = test.values(); return (vals[0] === "b" && vals.length === 1)}()), "Your <code>remove</code> method should remove the given item from the set.");'
+    testString: assert((function(){var test = new Set(); test.add('a');test.add('b');test.remove('a'); var vals = test.values(); return (vals[0] === 'b' && vals.length === 1)}()), 'Your <code>remove</code> method should remove the given item from the set.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-items-from-a-set-in-es6.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-items-from-a-set-in-es6.english.md
index 7cf03ac15d..ee96aa1756 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-items-from-a-set-in-es6.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/remove-items-from-a-set-in-es6.english.md
@@ -24,8 +24,8 @@ Now, create a set with the integers 1, 2, 3, 4, & 5.
 
 ```yml
 tests:
-  - text: 'Your Set should contain the values 1, 3, & 4'
-    testString: 'assert(function(){var test = checkSet(); return test.has(1) && test.has(3) && test.has(4) && test.size === 3}, "Your Set should contain the values 1, 3, & 4");'
+  - text: Your Set should contain the values 1, 3, & 4
+    testString: assert(function(){var test = checkSet(); return test.has(1) && test.has(3) && test.has(4) && test.size === 3}, 'Your Set should contain the values 1, 3, & 4');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/reverse-a-doubly-linked-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/reverse-a-doubly-linked-list.english.md
index 7403961299..7bbaf6ec69 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/reverse-a-doubly-linked-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/reverse-a-doubly-linked-list.english.md
@@ -20,17 +20,17 @@ Let's create one more method for our doubly linked list called reverse which rev
 ```yml
 tests:
   - text: The DoublyLinkedList data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; return (typeof test == "object")})(), "The DoublyLinkedList data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; return (typeof test == 'object')})(), 'The DoublyLinkedList data structure exists.');
   - text: The DoublyLinkedList has a method called add.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; if (test.add == undefined) { return false; }; return (typeof test.add == "function")})(), "The DoublyLinkedList has a method called add.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; if (test.add == undefined) { return false; }; return (typeof test.add == 'function')})(), 'The DoublyLinkedList has a method called add.');
   - text: The DoublyLinkedList has a method called reverse.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; if (test.reverse == undefined) { return false; }; return (typeof test.reverse == "function")})(), "The DoublyLinkedList has a method called reverse.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; if (test.reverse == undefined) { return false; }; return (typeof test.reverse == 'function')})(), 'The DoublyLinkedList has a method called reverse.');
   - text: Reversing an empty list returns null.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; return (test.reverse() == null); })(), "Reversing an empty list returns null.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; return (test.reverse() == null); })(), 'Reversing an empty list returns null.');
   - text: The reverse method reverses the list.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(58); test.add(61); test.add(32); test.reverse(); return (test.print().join("") == "326158"); })(), "The reverse method reverses the list.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; test.add(58); test.add(61); test.add(32); test.reverse(); return (test.print().join('') == '326158'); })(), 'The reverse method reverses the list.');
   - text: The next and previous references are correctly maintained when a list is reversed.
-    testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(11); test.add(22); test.add(33); test.reverse(); return (test.printReverse().join("") == "112233"); })(), "The next and previous references are correctly maintained when a list is reversed.");'
+    testString: assert((function() { var test = false; if (typeof DoublyLinkedList !== 'undefined') { test = new DoublyLinkedList() }; test.add(11); test.add(22); test.add(33); test.reverse(); return (test.printReverse().join('') == '112233'); })(), 'The next and previous references are correctly maintained when a list is reversed.');
 
 ```
 
@@ -62,7 +62,52 @@ var DoublyLinkedList = function() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+DoublyLinkedList.prototype = {
+  add(data) {
+    if (this.head == null) {
+      this.head = new Node(data, null);
+      this.tail = this.head;
+    } else {
+      var node = this.head;
+      var prev = null;
+      while (node.next != null) {
+        prev = node;
+        node = node.next;
+      };
+      var newNode = new Node(data, node);
+      node.next = newNode;
+      this.tail = newNode;
+    };
+  },
+  print() {
+    if (this.head == null) {
+      return null;
+    } else {
+      var result = new Array();
+      var node = this.head;
+      while (node.next != null) {
+        result.push(node.data);
+        node = node.next;
+      };
+      result.push(node.data);
+      return result;
+    };
+  },
+  printReverse() {
+    if (this.tail == null) {
+      return null;
+    } else {
+      var result = new Array();
+      var node = this.tail;
+      while (node.prev != null) {
+        result.push(node.data);
+        node = node.prev;
+      };
+      result.push(node.data);
+      return result;
+    };
+  }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/search-within-a-linked-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/search-within-a-linked-list.english.md
index e231c45917..a6e86d63d0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/search-within-a-linked-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/search-within-a-linked-list.english.md
@@ -22,15 +22,15 @@ Write an <code>isEmpty</code> method that checks if the linked list is empty, an
 ```yml
 tests:
   - text: Your <code>LinkedList</code> class should have a <code>indexOf</code> method.
-    testString: 'assert((function(){var test = new LinkedList(); return (typeof test.indexOf === "function")}()), "Your <code>LinkedList</code> class should have a <code>indexOf</code> method.");'
+    testString: assert((function(){var test = new LinkedList(); return (typeof test.indexOf === 'function')}()), 'Your <code>LinkedList</code> class should have a <code>indexOf</code> method.');
   - text: Your <code>LinkedList</code> class should have a <code>elementAt</code> method.
-    testString: 'assert((function(){var test = new LinkedList(); return (typeof test.elementAt === "function")}()), "Your <code>LinkedList</code> class should have a <code>elementAt</code> method.");'
+    testString: assert((function(){var test = new LinkedList(); return (typeof test.elementAt === 'function')}()), 'Your <code>LinkedList</code> class should have a <code>elementAt</code> method.');
   - text: Your <code>size</code> method should return the length of the linked list
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten"); return test.size() === 3}()), "Your <code>size</code> method should return the length of the linked list");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten'); return test.size() === 3}()), 'Your <code>size</code> method should return the length of the linked list');
   - text: Your <code>indexOf</code> method should return the index of the given element.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten"); return test.indexOf("kitten") === 2}()), "Your <code>indexOf</code> method should return the index of the given element.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten'); return test.indexOf('kitten') === 2}()), 'Your <code>indexOf</code> method should return the index of the given element.');
   - text: Your <code>elementAt</code> method should return at element at a given index.
-    testString: 'assert((function(){var test = new LinkedList(); test.add("cat"); test.add("dog"); test.add("kitten"); return test.elementAt(1) === "dog"}()), "Your <code>elementAt</code> method should return at element at a given index.");'
+    testString: assert((function(){var test = new LinkedList(); test.add('cat'); test.add('dog'); test.add('kitten'); return test.elementAt(1) === 'dog'}()), 'Your <code>elementAt</code> method should return at element at a given index.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/size-of-the-set.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/size-of-the-set.english.md
index 79ecfab72a..cfdeeba9e8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/size-of-the-set.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/size-of-the-set.english.md
@@ -20,9 +20,9 @@ In this exercise we are going to create a size function for our Set. This functi
 ```yml
 tests:
   - text: Your <code>Set</code> class should have a <code>size</code> method.
-    testString: 'assert((function(){var test = new Set(); return (typeof test.size === "function")}()), "Your <code>Set</code> class should have a <code>size</code> method.");'
+    testString: assert((function(){var test = new Set(); return (typeof test.size === 'function')}()), 'Your <code>Set</code> class should have a <code>size</code> method.');
   - text: The <code>size</code> method should return the number of elements in the collection.
-    testString: 'assert((function(){var test = new Set(); test.add("a");test.add("b");test.remove("a");return (test.size() === 1)}()), "The <code>size</code> method should return the number of elements in the collection.");'
+    testString: assert((function(){var test = new Set(); test.add('a');test.add('b');test.remove('a');return (test.size() === 1)}()), 'The <code>size</code> method should return the number of elements in the collection.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/typed-arrays.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/typed-arrays.english.md
index 7fc3eca4fc..98e59e9a27 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/typed-arrays.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/typed-arrays.english.md
@@ -33,11 +33,11 @@ First create a <code>buffer</code> that is 64-bytes. Then create a <code>Int32Ar
 ```yml
 tests:
   - text: Your <code>buffer</code> should be 64 bytes large.
-    testString: 'assert(buffer.byteLength === 64, "Your <code>buffer</code> should be 64 bytes large.");'
+    testString: assert(buffer.byteLength === 64, 'Your <code>buffer</code> should be 64 bytes large.');
   - text: Your <code>i32View</code> view of your buffer should be 64 bytes large.
-    testString: 'assert(i32View.byteLength === 64, "Your <code>i32View</code> view of your buffer should be 64 bytes large.");'
+    testString: assert(i32View.byteLength === 64, 'Your <code>i32View</code> view of your buffer should be 64 bytes large.');
   - text: Your <code>i32View</code> view of your buffer should be 16 elements long.
-    testString: 'assert(i32View.length === 16, "Your <code>i32View</code> view of your buffer should be 16 elements long.");'
+    testString: assert(i32View.length === 16, 'Your <code>i32View</code> view of your buffer should be 16 elements long.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-.has-and-.size-on-an-es6-set.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-.has-and-.size-on-an-es6-set.english.md
index e2949fac70..23b01941c0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-.has-and-.size-on-an-es6-set.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-.has-and-.size-on-an-es6-set.english.md
@@ -25,8 +25,8 @@ In this exercise we will pass an array and a value to the checkSet() function. Y
 
 ```yml
 tests:
-  - text: '<code>checkSet([4, 5, 6], 3)</code> should return [ false, 3 ]'
-    testString: 'assert(function(){var test = checkSet([4,5,6], 3); test === [ false, 3 ]}, "<code>checkSet([4, 5, 6], 3)</code> should return [ false, 3 ]");'
+  - text: <code>checkSet([4, 5, 6], 3)</code> should return [ false, 3 ]
+    testString: assert(function(){var test = checkSet([4,5,6], 3); test === [ false, 3 ]}, '<code>checkSet([4, 5, 6], 3)</code> should return [ false, 3 ]');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-breadth-first-search-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-breadth-first-search-in-a-binary-search-tree.english.md
index 70ee6ad89f..9460a5dc16 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-breadth-first-search-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-breadth-first-search-in-a-binary-search-tree.english.md
@@ -22,19 +22,19 @@ Instructions: Let's create a breadth-first search method in our tree called <cod
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>levelOrder</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.levelOrder == "function")})(), "The binary search tree has a method called <code>levelOrder</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.levelOrder == 'function')})(), 'The binary search tree has a method called <code>levelOrder</code>.');
   - text: The binary search tree has a method called <code>reverseLevelOrder</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.reverseLevelOrder == "function")})(), "The binary search tree has a method called <code>reverseLevelOrder</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.reverseLevelOrder == 'function')})(), 'The binary search tree has a method called <code>reverseLevelOrder</code>.');
   - text: The <code>levelOrder</code> method returns an array of the tree node values explored in level order.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.levelOrder !== "function") { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.levelOrder().join("") == "719038102546"); })(), "The <code>levelOrder</code> method returns an array of the tree node values explored in level order.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.levelOrder !== 'function') { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.levelOrder().join('') == '719038102546'); })(), 'The <code>levelOrder</code> method returns an array of the tree node values explored in level order.');
   - text: The <code>reverseLevelOrder</code> method returns an array of the tree node values explored in reverse level order.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.reverseLevelOrder !== "function") { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.reverseLevelOrder().join("") == "791108305264"); })(), "The <code>reverseLevelOrder</code> method returns an array of the tree node values explored in reverse level order.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.reverseLevelOrder !== 'function') { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.reverseLevelOrder().join('') == '791108305264'); })(), 'The <code>reverseLevelOrder</code> method returns an array of the tree node values explored in reverse level order.');
   - text: The <code>levelOrder</code> method returns <code>null</code> for an empty tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.levelOrder !== "function") { return false; }; return (test.levelOrder() == null); })(), "The <code>levelOrder</code> method returns <code>null</code> for an empty tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.levelOrder !== 'function') { return false; }; return (test.levelOrder() == null); })(), 'The <code>levelOrder</code> method returns <code>null</code> for an empty tree.');
   - text: The <code>reverseLevelOrder</code> method returns <code>null</code> for an empty tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.reverseLevelOrder !== "function") { return false; }; return (test.reverseLevelOrder() == null); })(), "The <code>reverseLevelOrder</code> method returns <code>null</code> for an empty tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.reverseLevelOrder !== 'function') { return false; }; return (test.reverseLevelOrder() == null); })(), 'The <code>reverseLevelOrder</code> method returns <code>null</code> for an empty tree.');
 
 ```
 
@@ -66,7 +66,36 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-depth-first-search-in-a-binary-search-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-depth-first-search-in-a-binary-search-tree.english.md
index d70480b03a..3fcf953054 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-depth-first-search-in-a-binary-search-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-depth-first-search-in-a-binary-search-tree.english.md
@@ -26,25 +26,25 @@ Define <code>inorder</code>, <code>preorder</code>, and <code>postorder</code> m
 ```yml
 tests:
   - text: The <code>BinarySearchTree</code> data structure exists.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() }; return (typeof test == "object")})(), "The <code>BinarySearchTree</code> data structure exists.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() }; return (typeof test == 'object')})(), 'The <code>BinarySearchTree</code> data structure exists.');
   - text: The binary search tree has a method called <code>inorder</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.inorder == "function")})(), "The binary search tree has a method called <code>inorder</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.inorder == 'function')})(), 'The binary search tree has a method called <code>inorder</code>.');
   - text: The binary search tree has a method called <code>preorder</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.preorder == "function")})(), "The binary search tree has a method called <code>preorder</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.preorder == 'function')})(), 'The binary search tree has a method called <code>preorder</code>.');
   - text: The binary search tree has a method called <code>postorder</code>.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; return (typeof test.postorder == "function")})(), "The binary search tree has a method called <code>postorder</code>.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; return (typeof test.postorder == 'function')})(), 'The binary search tree has a method called <code>postorder</code>.');
   - text: The <code>inorder</code> method returns an array of the node values that result from an inorder traversal.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.inorder !== "function") { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.inorder().join("") == "012345678910"); })(), "The <code>inorder</code> method returns an array of the node values that result from an inorder traversal.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.inorder !== 'function') { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.inorder().join('') == '012345678910'); })(), 'The <code>inorder</code> method returns an array of the node values that result from an inorder traversal.');
   - text: The <code>preorder</code> method returns an array of the node values that result from a preorder traversal.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.preorder !== "function") { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.preorder().join("") == "710325469810"); })(), "The <code>preorder</code> method returns an array of the node values that result from a preorder traversal.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.preorder !== 'function') { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.preorder().join('') == '710325469810'); })(), 'The <code>preorder</code> method returns an array of the node values that result from a preorder traversal.');
   - text: The <code>postorder</code> method returns an array of the node values that result from a postorder traversal.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.postorder !== "function") { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.postorder().join("") == "024653181097"); })(), "The <code>postorder</code> method returns an array of the node values that result from a postorder traversal.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.postorder !== 'function') { return false; }; test.add(7); test.add(1); test.add(9); test.add(0); test.add(3); test.add(8); test.add(10); test.add(2); test.add(5); test.add(4); test.add(6); return (test.postorder().join('') == '024653181097'); })(), 'The <code>postorder</code> method returns an array of the node values that result from a postorder traversal.');
   - text: The <code>inorder</code> method returns <code>null</code> for an empty tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.inorder !== "function") { return false; }; return (test.inorder() == null); })(), "The <code>inorder</code> method returns <code>null</code> for an empty tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.inorder !== 'function') { return false; }; return (test.inorder() == null); })(), 'The <code>inorder</code> method returns <code>null</code> for an empty tree.');
   - text: The <code>preorder</code> method returns <code>null</code> for an empty tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.preorder !== "function") { return false; }; return (test.preorder() == null); })(), "The <code>preorder</code> method returns <code>null</code> for an empty tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.preorder !== 'function') { return false; }; return (test.preorder() == null); })(), 'The <code>preorder</code> method returns <code>null</code> for an empty tree.');
   - text: The <code>postorder</code> method returns <code>null</code> for an empty tree.
-    testString: 'assert((function() { var test = false; if (typeof BinarySearchTree !== "undefined") { test = new BinarySearchTree() } else { return false; }; if (typeof test.postorder !== "function") { return false; }; return (test.postorder() == null); })(), "The <code>postorder</code> method returns <code>null</code> for an empty tree.");'
+    testString: assert((function() { var test = false; if (typeof BinarySearchTree !== 'undefined') { test = new BinarySearchTree() } else { return false; }; if (typeof test.postorder !== 'function') { return false; }; return (test.postorder() == null); })(), 'The <code>postorder</code> method returns <code>null</code> for an empty tree.');
 
 ```
 
@@ -76,7 +76,36 @@ function BinarySearchTree() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+BinarySearchTree.prototype = {
+    add: function(value) {
+        var node = this.root;
+        if (node == null) {
+          this.root = new Node(value);
+          return;
+        } else {
+            function searchTree(node) {
+                if (value < node.value) {
+                    if (node.left == null) {
+                        node.left = new Node(value);
+                        return;
+                    } else if (node.left != null) {
+                        return searchTree(node.left)
+                    };
+                } else if (value > node.value) {
+                    if (node.right == null) {
+                        node.right = new Node(value);
+                        return;
+                    } else if (node.right != null) {
+                        return searchTree(node.right);
+                    };
+                } else {
+                    return null;
+                };
+            };
+            return searchTree(node);
+        };
+    }
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-spread-and-notes-for-es5-set-integration.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-spread-and-notes-for-es5-set-integration.english.md
index 7060446cae..73fa774d84 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-spread-and-notes-for-es5-set-integration.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/use-spread-and-notes-for-es5-set-integration.english.md
@@ -24,7 +24,7 @@ Now you've successfully learned how to use the ES6 <code>Set()</code> object, go
 ```yml
 tests:
   - text: Your Set was returned correctly!
-    testString: 'assert(function(){var test = checkSet(new Set([1,2,3,4,5,6,7])); test === [ 1, 2, 3, 4, 5, 6, 7 ]}, "Your Set was returned correctly!");'
+    testString: assert(function(){var test = checkSet(new Set([1,2,3,4,5,6,7])); test === [ 1, 2, 3, 4, 5, 6, 7 ]}, 'Your Set was returned correctly!');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/data-structures/work-with-nodes-in-a-linked-list.english.md b/curriculum/challenges/english/08-coding-interview-prep/data-structures/work-with-nodes-in-a-linked-list.english.md
index d232f82731..b43aa51b0c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/data-structures/work-with-nodes-in-a-linked-list.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/data-structures/work-with-nodes-in-a-linked-list.english.md
@@ -22,9 +22,9 @@ Create a <code>Cat</code> and <code>Dog</code> node and manually add them to the
 ```yml
 tests:
   - text: Your <code>Puppy</code> node should have a reference to a <code>Cat</code> node.
-    testString: 'assert(Puppy.next.element === "Cat", "Your <code>Puppy</code> node should have a reference to a <code>Cat</code> node.");'
+    testString: assert(Puppy.next.element === "Cat", 'Your <code>Puppy</code> node should have a reference to a <code>Cat</code> node.');
   - text: Your <code>Cat</code> node should have a reference to a <code>Dog</code> node.
-    testString: 'assert(Cat.next.element === "Dog", "Your <code>Cat</code> node should have a reference to a <code>Dog</code> node.");'
+    testString: assert(Cat.next.element === "Dog", 'Your <code>Cat</code> node should have a reference to a <code>Dog</code> node.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-1-multiples-of-3-and-5.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-1-multiples-of-3-and-5.english.md
index 9fef3e1f60..9cff7c0e62 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-1-multiples-of-3-and-5.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-1-multiples-of-3-and-5.english.md
@@ -21,13 +21,13 @@ Find the sum of all the multiples of 3 or 5 below the provided parameter value <
 ```yml
 tests:
   - text: <code>multiplesOf3and5(1000)</code> should return 233168.
-    testString: 'assert.strictEqual(multiplesOf3and5(1000), 233168, "<code>multiplesOf3and5(1000)</code> should return 233168.");'
+    testString: assert.strictEqual(multiplesOf3and5(1000), 233168, '<code>multiplesOf3and5(1000)</code> should return 233168.');
   - text: <code>multiplesOf3and5(49)</code> should return 543.
-    testString: 'assert.strictEqual(multiplesOf3and5(49), 543, "<code>multiplesOf3and5(49)</code> should return 543.");'
+    testString: assert.strictEqual(multiplesOf3and5(49), 543, '<code>multiplesOf3and5(49)</code> should return 543.');
   - text: <code>multiplesOf3and5(19564)</code> should return 89301183.
-    testString: 'assert.strictEqual(multiplesOf3and5(19564), 89301183, "<code>multiplesOf3and5(19564)</code> should return 89301183.");'
+    testString: assert.strictEqual(multiplesOf3and5(19564), 89301183, '<code>multiplesOf3and5(19564)</code> should return 89301183.');
   - text: Your function is not returning the correct result using our tests values.
-    testString: 'assert.strictEqual(multiplesOf3and5(8456), 16687353, "Your function is not returning the correct result using our tests values.");'
+    testString: assert.strictEqual(multiplesOf3and5(8456), 16687353, 'Your function is not returning the correct result using our tests values.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-10-summation-of-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-10-summation-of-primes.english.md
index 48b3043d82..8317feedc9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-10-summation-of-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-10-summation-of-primes.english.md
@@ -21,13 +21,13 @@ Find the sum of all the primes below n.
 ```yml
 tests:
   - text: <code>primeSummation(17)</code> should return 41.
-    testString: 'assert.strictEqual(primeSummation(17), 41, "<code>primeSummation(17)</code> should return 41.");'
+    testString: assert.strictEqual(primeSummation(17), 41, '<code>primeSummation(17)</code> should return 41.');
   - text: <code>primeSummation(2001)</code> should return 277050.
-    testString: 'assert.strictEqual(primeSummation(2001), 277050, "<code>primeSummation(2001)</code> should return 277050.");'
+    testString: assert.strictEqual(primeSummation(2001), 277050, '<code>primeSummation(2001)</code> should return 277050.');
   - text: <code>primeSummation(140759)</code> should return 873608362.
-    testString: 'assert.strictEqual(primeSummation(140759), 873608362, "<code>primeSummation(140759)</code> should return 873608362.");'
+    testString: assert.strictEqual(primeSummation(140759), 873608362, '<code>primeSummation(140759)</code> should return 873608362.');
   - text: <code>primeSummation(2000000)</code> should return 142913828922.
-    testString: 'assert.strictEqual(primeSummation(2000000), 142913828922, "<code>primeSummation(2000000)</code> should return 142913828922.");'
+    testString: assert.strictEqual(primeSummation(2000000), 142913828922, '<code>primeSummation(2000000)</code> should return 142913828922.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-100-arranged-probability.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-100-arranged-probability.english.md
index 4efb3b48cb..6317482f01 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-100-arranged-probability.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-100-arranged-probability.english.md
@@ -22,7 +22,7 @@ By finding the first arrangement to contain over 1012 = 1,000,000,000,000 discs
 ```yml
 tests:
   - text: <code>euler100()</code> should return 756872327473.
-    testString: 'assert.strictEqual(euler100(), 756872327473, "<code>euler100()</code> should return 756872327473.");'
+    testString: assert.strictEqual(euler100(), 756872327473, '<code>euler100()</code> should return 756872327473.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-101-optimum-polynomial.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-101-optimum-polynomial.english.md
index f5c1db5b4b..d0092c0dd2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-101-optimum-polynomial.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-101-optimum-polynomial.english.md
@@ -40,7 +40,7 @@ Find the sum of FITs for the BOPs.
 ```yml
 tests:
   - text: <code>euler101()</code> should return 37076114526.
-    testString: 'assert.strictEqual(euler101(), 37076114526, "<code>euler101()</code> should return 37076114526.");'
+    testString: assert.strictEqual(euler101(), 37076114526, '<code>euler101()</code> should return 37076114526.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-102-triangle-containment.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-102-triangle-containment.english.md
index db5dd1fa34..f80d6239ff 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-102-triangle-containment.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-102-triangle-containment.english.md
@@ -26,7 +26,7 @@ NOTE: The first two examples in the file represent the triangles in the example
 ```yml
 tests:
   - text: <code>euler102()</code> should return 228.
-    testString: 'assert.strictEqual(euler102(), 228, "<code>euler102()</code> should return 228.");'
+    testString: assert.strictEqual(euler102(), 228, '<code>euler102()</code> should return 228.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-103-special-subset-sums-optimum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-103-special-subset-sums-optimum.english.md
index caf6f0ecd2..b38987bad9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-103-special-subset-sums-optimum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-103-special-subset-sums-optimum.english.md
@@ -28,7 +28,7 @@ NOTE: This problem is related to Problem 105 and Problem 106.
 ```yml
 tests:
   - text: <code>euler103()</code> should return 20313839404245.
-    testString: 'assert.strictEqual(euler103(), 20313839404245, "<code>euler103()</code> should return 20313839404245.");'
+    testString: assert.strictEqual(euler103(), 20313839404245, '<code>euler103()</code> should return 20313839404245.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-104-pandigital-fibonacci-ends.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-104-pandigital-fibonacci-ends.english.md
index cbe01a7e2a..0db6951734 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-104-pandigital-fibonacci-ends.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-104-pandigital-fibonacci-ends.english.md
@@ -23,7 +23,7 @@ Given that Fk is the first Fibonacci number for which the first nine digits AND
 ```yml
 tests:
   - text: <code>euler104()</code> should return 329468.
-    testString: 'assert.strictEqual(euler104(), 329468, "<code>euler104()</code> should return 329468.");'
+    testString: assert.strictEqual(euler104(), 329468, '<code>euler104()</code> should return 329468.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-105-special-subset-sums-testing.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-105-special-subset-sums-testing.english.md
index c9d3ba4096..796340ef7d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-105-special-subset-sums-testing.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-105-special-subset-sums-testing.english.md
@@ -25,7 +25,7 @@ NOTE: This problem is related to Problem 103 and Problem 106.
 ```yml
 tests:
   - text: <code>euler105()</code> should return 73702.
-    testString: 'assert.strictEqual(euler105(), 73702, "<code>euler105()</code> should return 73702.");'
+    testString: assert.strictEqual(euler105(), 73702, '<code>euler105()</code> should return 73702.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-106-special-subset-sums-meta-testing.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-106-special-subset-sums-meta-testing.english.md
index b5c5079546..1f3e1d207e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-106-special-subset-sums-meta-testing.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-106-special-subset-sums-meta-testing.english.md
@@ -26,7 +26,7 @@ NOTE: This problem is related to Problem 103 and Problem 105.
 ```yml
 tests:
   - text: <code>euler106()</code> should return 21384.
-    testString: 'assert.strictEqual(euler106(), 21384, "<code>euler106()</code> should return 21384.");'
+    testString: assert.strictEqual(euler106(), 21384, '<code>euler106()</code> should return 21384.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-107-minimal-network.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-107-minimal-network.english.md
index ded306953c..5e6f1c0be2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-107-minimal-network.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-107-minimal-network.english.md
@@ -35,7 +35,7 @@ Using network.txt (right click and 'Save Link/Target As...'), a 6K text file con
 ```yml
 tests:
   - text: <code>euler107()</code> should return 259679.
-    testString: 'assert.strictEqual(euler107(), 259679, "<code>euler107()</code> should return 259679.");'
+    testString: assert.strictEqual(euler107(), 259679, '<code>euler107()</code> should return 259679.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-108-diophantine-reciprocals-i.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-108-diophantine-reciprocals-i.english.md
index e26cbfc246..0dd1d44394 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-108-diophantine-reciprocals-i.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-108-diophantine-reciprocals-i.english.md
@@ -24,7 +24,7 @@ What is the least value of <var>n</var> for which the number of distinct solutio
 ```yml
 tests:
   - text: <code>diophantineOne()</code> should return 180180.
-    testString: 'assert.strictEqual(diophantineOne(), 180180, "<code>diophantineOne()</code> should return 180180.");'
+    testString: assert.strictEqual(diophantineOne(), 180180, '<code>diophantineOne()</code> should return 180180.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-109-darts.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-109-darts.english.md
index ac43195497..3204ea5d14 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-109-darts.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-109-darts.english.md
@@ -66,7 +66,7 @@ How many distinct ways can a player checkout with a score less than 100?
 ```yml
 tests:
   - text: <code>euler109()</code> should return 38182.
-    testString: 'assert.strictEqual(euler109(), 38182, "<code>euler109()</code> should return 38182.");'
+    testString: assert.strictEqual(euler109(), 38182, '<code>euler109()</code> should return 38182.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-11-largest-product-in-a-grid.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-11-largest-product-in-a-grid.english.md
index 1caf751f26..ef018a0d3c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-11-largest-product-in-a-grid.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-11-largest-product-in-a-grid.english.md
@@ -44,9 +44,9 @@ What is the greatest product of four adjacent numbers in the same direction (up,
 ```yml
 tests:
   - text: <code>largestGridProduct(grid)</code> should return 70600674.
-    testString: 'assert.strictEqual(largestGridProduct(grid), 70600674, "<code>largestGridProduct(grid)</code> should return 70600674.");'
+    testString: assert.strictEqual(largestGridProduct(grid), 70600674, '<code>largestGridProduct(grid)</code> should return 70600674.');
   - text: <code>largestGridProduct(testGrid)</code> should return 14169081.
-    testString: 'assert.strictEqual(largestGridProduct(testGrid), 14169081, "<code>largestGridProduct(testGrid)</code> should return 14169081.");'
+    testString: assert.strictEqual(largestGridProduct(testGrid), 14169081, '<code>largestGridProduct(testGrid)</code> should return 14169081.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-110-diophantine-reciprocals-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-110-diophantine-reciprocals-ii.english.md
index e3dfe83a41..47fe104688 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-110-diophantine-reciprocals-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-110-diophantine-reciprocals-ii.english.md
@@ -23,7 +23,7 @@ What is the least value of <var>n</var> for which the number of distinct solutio
 ```yml
 tests:
   - text: <code>diophantineTwo</code> should return 9350130049860600.
-    testString: 'assert.strictEqual(diophantineTwo(), 9350130049860600, "<code>diophantineTwo()</code> should return 9350130049860600.");'
+    testString: assert.strictEqual(diophantineTwo(), 9350130049860600, '<code>diophantineTwo()</code> should return 9350130049860600.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-111-primes-with-runs.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-111-primes-with-runs.english.md
index e162effe19..f9e1dab79a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-111-primes-with-runs.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-111-primes-with-runs.english.md
@@ -72,7 +72,7 @@ Find the sum of all S(10, d).
 ```yml
 tests:
   - text: <code>euler111()</code> should return 612407567715.
-    testString: 'assert.strictEqual(euler111(), 612407567715, "<code>euler111()</code> should return 612407567715.");'
+    testString: assert.strictEqual(euler111(), 612407567715, '<code>euler111()</code> should return 612407567715.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-112-bouncy-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-112-bouncy-numbers.english.md
index e1cb1c7165..6a98601d4b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-112-bouncy-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-112-bouncy-numbers.english.md
@@ -25,7 +25,7 @@ Find the least number for which the proportion of bouncy numbers is exactly 99%.
 ```yml
 tests:
   - text: <code>euler112()</code> should return 1587000.
-    testString: 'assert.strictEqual(euler112(), 1587000, "<code>euler112()</code> should return 1587000.");'
+    testString: assert.strictEqual(euler112(), 1587000, '<code>euler112()</code> should return 1587000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-113-non-bouncy-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-113-non-bouncy-numbers.english.md
index 75bd210bf1..b9c484d12f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-113-non-bouncy-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-113-non-bouncy-numbers.english.md
@@ -24,7 +24,7 @@ How many numbers below a googol (10100) are not bouncy?
 ```yml
 tests:
   - text: <code>euler113()</code> should return 51161058134250.
-    testString: 'assert.strictEqual(euler113(), 51161058134250, "<code>euler113()</code> should return 51161058134250.");'
+    testString: assert.strictEqual(euler113(), 51161058134250, '<code>euler113()</code> should return 51161058134250.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-114-counting-block-combinations-i.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-114-counting-block-combinations-i.english.md
index 38a47f4aba..12bc3dd9d5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-114-counting-block-combinations-i.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-114-counting-block-combinations-i.english.md
@@ -123,7 +123,7 @@ NOTE: Although the example above does not lend itself to the possibility, in gen
 ```yml
 tests:
   - text: <code>euler114()</code> should return 16475640049.
-    testString: 'assert.strictEqual(euler114(), 16475640049, "<code>euler114()</code> should return 16475640049.");'
+    testString: assert.strictEqual(euler114(), 16475640049, '<code>euler114()</code> should return 16475640049.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-115-counting-block-combinations-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-115-counting-block-combinations-ii.english.md
index 189059a775..50c971c634 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-115-counting-block-combinations-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-115-counting-block-combinations-ii.english.md
@@ -26,7 +26,7 @@ For m = 50, find the least value of n for which the fill-count function first ex
 ```yml
 tests:
   - text: <code>euler115()</code> should return 168.
-    testString: 'assert.strictEqual(euler115(), 168, "<code>euler115()</code> should return 168.");'
+    testString: assert.strictEqual(euler115(), 168, '<code>euler115()</code> should return 168.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-116-red-green-or-blue-tiles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-116-red-green-or-blue-tiles.english.md
index 075a22b2c9..4ac78a63e3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-116-red-green-or-blue-tiles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-116-red-green-or-blue-tiles.english.md
@@ -93,7 +93,7 @@ NOTE: This is related to Problem 117.
 ```yml
 tests:
   - text: <code>euler116()</code> should return 20492570929.
-    testString: 'assert.strictEqual(euler116(), 20492570929, "<code>euler116()</code> should return 20492570929.");'
+    testString: assert.strictEqual(euler116(), 20492570929, '<code>euler116()</code> should return 20492570929.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-117-red-green-and-blue-tiles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-117-red-green-and-blue-tiles.english.md
index cb87e8fd11..1b904b2d8e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-117-red-green-and-blue-tiles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-117-red-green-and-blue-tiles.english.md
@@ -101,7 +101,7 @@ NOTE: This is related to Problem 116.
 ```yml
 tests:
   - text: <code>euler117()</code> should return 100808458960497.
-    testString: 'assert.strictEqual(euler117(), 100808458960497, "<code>euler117()</code> should return 100808458960497.");'
+    testString: assert.strictEqual(euler117(), 100808458960497, '<code>euler117()</code> should return 100808458960497.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-118-pandigital-prime-sets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-118-pandigital-prime-sets.english.md
index ade9d2ea18..02438e494b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-118-pandigital-prime-sets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-118-pandigital-prime-sets.english.md
@@ -21,7 +21,7 @@ How many distinct sets containing each of the digits one through nine exactly on
 ```yml
 tests:
   - text: <code>euler118()</code> should return 44680.
-    testString: 'assert.strictEqual(euler118(), 44680, "<code>euler118()</code> should return 44680.");'
+    testString: assert.strictEqual(euler118(), 44680, '<code>euler118()</code> should return 44680.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-119-digit-power-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-119-digit-power-sum.english.md
index 1dd763477a..9be19399a5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-119-digit-power-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-119-digit-power-sum.english.md
@@ -23,7 +23,7 @@ Find a30.
 ```yml
 tests:
   - text: <code>euler119()</code> should return 248155780267521.
-    testString: 'assert.strictEqual(euler119(), 248155780267521, "<code>euler119()</code> should return 248155780267521.");'
+    testString: assert.strictEqual(euler119(), 248155780267521, '<code>euler119()</code> should return 248155780267521.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-12-highly-divisible-triangular-number.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-12-highly-divisible-triangular-number.english.md
index 38900c0865..ff1ee5a780 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-12-highly-divisible-triangular-number.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-12-highly-divisible-triangular-number.english.md
@@ -31,15 +31,15 @@ What is the value of the first triangle number to have over <code>n</code> divis
 ```yml
 tests:
   - text: <code>divisibleTriangleNumber(5)</code> should return 28.
-    testString: 'assert.strictEqual(divisibleTriangleNumber(5), 28, "<code>divisibleTriangleNumber(5)</code> should return 28.");'
+    testString: assert.strictEqual(divisibleTriangleNumber(5), 28, '<code>divisibleTriangleNumber(5)</code> should return 28.');
   - text: <code>divisibleTriangleNumber(23)</code> should return 630.
-    testString: 'assert.strictEqual(divisibleTriangleNumber(23), 630, "<code>divisibleTriangleNumber(23)</code> should return 630.");'
+    testString: assert.strictEqual(divisibleTriangleNumber(23), 630, '<code>divisibleTriangleNumber(23)</code> should return 630.');
   - text: <code>divisibleTriangleNumber(167)</code> should return 1385280.
-    testString: 'assert.strictEqual(divisibleTriangleNumber(167), 1385280, "<code>divisibleTriangleNumber(167)</code> should return 1385280.");'
+    testString: assert.strictEqual(divisibleTriangleNumber(167), 1385280, '<code>divisibleTriangleNumber(167)</code> should return 1385280.');
   - text: <code>divisibleTriangleNumber(374)</code> should return 17907120.
-    testString: 'assert.strictEqual(divisibleTriangleNumber(374), 17907120, "<code>divisibleTriangleNumber(374)</code> should return 17907120.");'
+    testString: assert.strictEqual(divisibleTriangleNumber(374), 17907120, '<code>divisibleTriangleNumber(374)</code> should return 17907120.');
   - text: <code>divisibleTriangleNumber(500)</code> should return 76576500.
-    testString: 'assert.strictEqual(divisibleTriangleNumber(500), 76576500, "<code>divisibleTriangleNumber(500)</code> should return 76576500.");'
+    testString: assert.strictEqual(divisibleTriangleNumber(500), 76576500, '<code>divisibleTriangleNumber(500)</code> should return 76576500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-120-square-remainders.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-120-square-remainders.english.md
index 346f00e288..c3db537dbd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-120-square-remainders.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-120-square-remainders.english.md
@@ -22,7 +22,7 @@ For 3 ≤ a ≤ 1000, find ∑ rmax.
 ```yml
 tests:
   - text: <code>euler120()</code> should return 333082500.
-    testString: 'assert.strictEqual(euler120(), 333082500, "<code>euler120()</code> should return 333082500.");'
+    testString: assert.strictEqual(euler120(), 333082500, '<code>euler120()</code> should return 333082500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-121-disc-game-prize-fund.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-121-disc-game-prize-fund.english.md
index 3efc3ff76a..9b25ab50c6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-121-disc-game-prize-fund.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-121-disc-game-prize-fund.english.md
@@ -23,7 +23,7 @@ Find the maximum prize fund that should be allocated to a single game in which f
 ```yml
 tests:
   - text: <code>euler121()</code> should return 2269.
-    testString: 'assert.strictEqual(euler121(), 2269, "<code>euler121()</code> should return 2269.");'
+    testString: assert.strictEqual(euler121(), 2269, '<code>euler121()</code> should return 2269.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-122-efficient-exponentiation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-122-efficient-exponentiation.english.md
index 61cd1a0fd7..3cd50dc1b3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-122-efficient-exponentiation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-122-efficient-exponentiation.english.md
@@ -27,7 +27,7 @@ For 1 ≤ k ≤ 200, find ∑ m(k).
 ```yml
 tests:
   - text: <code>euler122()</code> should return 1582.
-    testString: 'assert.strictEqual(euler122(), 1582, "<code>euler122()</code> should return 1582.");'
+    testString: assert.strictEqual(euler122(), 1582, '<code>euler122()</code> should return 1582.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-123-prime-square-remainders.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-123-prime-square-remainders.english.md
index f4cf777b4e..93fadf7454 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-123-prime-square-remainders.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-123-prime-square-remainders.english.md
@@ -23,7 +23,7 @@ Find the least value of n for which the remainder first exceeds 1010.
 ```yml
 tests:
   - text: <code>euler123()</code> should return 21035.
-    testString: 'assert.strictEqual(euler123(), 21035, "<code>euler123()</code> should return 21035.");'
+    testString: assert.strictEqual(euler123(), 21035, '<code>euler123()</code> should return 21035.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-124-ordered-radicals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-124-ordered-radicals.english.md
index c38000a191..1c1586b574 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-124-ordered-radicals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-124-ordered-radicals.english.md
@@ -62,7 +62,7 @@ If rad(n) is sorted for 1 ≤ n ≤ 100000, find E(10000).
 ```yml
 tests:
   - text: <code>euler124()</code> should return 21417.
-    testString: 'assert.strictEqual(euler124(), 21417, "<code>euler124()</code> should return 21417.");'
+    testString: assert.strictEqual(euler124(), 21417, '<code>euler124()</code> should return 21417.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-125-palindromic-sums.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-125-palindromic-sums.english.md
index 16ff57d45b..06bf8d9a87 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-125-palindromic-sums.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-125-palindromic-sums.english.md
@@ -22,7 +22,7 @@ Find the sum of all the numbers less than 108 that are both palindromic and can
 ```yml
 tests:
   - text: <code>euler125()</code> should return 2906969179.
-    testString: 'assert.strictEqual(euler125(), 2906969179, "<code>euler125()</code> should return 2906969179.");'
+    testString: assert.strictEqual(euler125(), 2906969179, '<code>euler125()</code> should return 2906969179.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-126-cuboid-layers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-126-cuboid-layers.english.md
index 8b1588f553..145e67bad4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-126-cuboid-layers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-126-cuboid-layers.english.md
@@ -27,7 +27,7 @@ Find the least value of n for which C(n) = 1000.
 ```yml
 tests:
   - text: <code>euler126()</code> should return 18522.
-    testString: 'assert.strictEqual(euler126(), 18522, "<code>euler126()</code> should return 18522.");'
+    testString: assert.strictEqual(euler126(), 18522, '<code>euler126()</code> should return 18522.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-127-abc-hits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-127-abc-hits.english.md
index c44437ff4f..8dca49b5d3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-127-abc-hits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-127-abc-hits.english.md
@@ -32,7 +32,7 @@ Find ∑c for c < 120000.
 ```yml
 tests:
   - text: <code>euler127()</code> should return 18407904.
-    testString: 'assert.strictEqual(euler127(), 18407904, "<code>euler127()</code> should return 18407904.");'
+    testString: assert.strictEqual(euler127(), 18407904, '<code>euler127()</code> should return 18407904.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-128-hexagonal-tile-differences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-128-hexagonal-tile-differences.english.md
index 1e7a1d3339..b21983e0f6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-128-hexagonal-tile-differences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-128-hexagonal-tile-differences.english.md
@@ -29,7 +29,7 @@ Find the 2000th tile in this sequence.
 ```yml
 tests:
   - text: <code>euler128()</code> should return 14516824220.
-    testString: 'assert.strictEqual(euler128(), 14516824220, "<code>euler128()</code> should return 14516824220.");'
+    testString: assert.strictEqual(euler128(), 14516824220, '<code>euler128()</code> should return 14516824220.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-129-repunit-divisibility.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-129-repunit-divisibility.english.md
index eef8890445..9e34fd7570 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-129-repunit-divisibility.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-129-repunit-divisibility.english.md
@@ -23,7 +23,7 @@ Find the least value of n for which A(n) first exceeds one-million.
 ```yml
 tests:
   - text: <code>euler129()</code> should return 1000023.
-    testString: 'assert.strictEqual(euler129(), 1000023, "<code>euler129()</code> should return 1000023.");'
+    testString: assert.strictEqual(euler129(), 1000023, '<code>euler129()</code> should return 1000023.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-13-large-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-13-large-sum.english.md
index 04ed350f5c..1834b37932 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-13-large-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-13-large-sum.english.md
@@ -121,9 +121,9 @@ Work out the first ten digits of the sum of the following one-hundred 50-digit n
 ```yml
 tests:
   - text: <code>largeSum(testNums)</code> should return 8348422521.
-    testString: 'assert.strictEqual(largeSum(testNums), 8348422521, "<code>largeSum(testNums)</code> should return 8348422521.");'
+    testString: assert.strictEqual(largeSum(testNums), 8348422521, '<code>largeSum(testNums)</code> should return 8348422521.');
   - text: <code>largeSum(fiftyDigitNums)</code> should return 5537376230.
-    testString: 'assert.strictEqual(largeSum(fiftyDigitNums), 5537376230, "<code>largeSum(fiftyDigitNums)</code> should return 5537376230.");'
+    testString: assert.strictEqual(largeSum(fiftyDigitNums), 5537376230, '<code>largeSum(fiftyDigitNums)</code> should return 5537376230.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-130-composites-with-prime-repunit-property.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-130-composites-with-prime-repunit-property.english.md
index efdfc4887e..c50a108a4f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-130-composites-with-prime-repunit-property.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-130-composites-with-prime-repunit-property.english.md
@@ -24,7 +24,7 @@ Find the sum of the first twenty-five composite values of n for whichGCD(n, 10)
 ```yml
 tests:
   - text: <code>euler130()</code> should return 149253.
-    testString: 'assert.strictEqual(euler130(), 149253, "<code>euler130()</code> should return 149253.");'
+    testString: assert.strictEqual(euler130(), 149253, '<code>euler130()</code> should return 149253.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-131-prime-cube-partnership.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-131-prime-cube-partnership.english.md
index 5a1a0ed528..be1f738f15 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-131-prime-cube-partnership.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-131-prime-cube-partnership.english.md
@@ -23,7 +23,7 @@ How many primes below one million have this remarkable property?
 ```yml
 tests:
   - text: <code>euler131()</code> should return 173.
-    testString: 'assert.strictEqual(euler131(), 173, "<code>euler131()</code> should return 173.");'
+    testString: assert.strictEqual(euler131(), 173, '<code>euler131()</code> should return 173.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-132-large-repunit-factors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-132-large-repunit-factors.english.md
index f12fe11b28..9e48a7f1ce 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-132-large-repunit-factors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-132-large-repunit-factors.english.md
@@ -22,7 +22,7 @@ Find the sum of the first forty prime factors of R(109).
 ```yml
 tests:
   - text: <code>euler132()</code> should return 843296.
-    testString: 'assert.strictEqual(euler132(), 843296, "<code>euler132()</code> should return 843296.");'
+    testString: assert.strictEqual(euler132(), 843296, '<code>euler132()</code> should return 843296.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-133-repunit-nonfactors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-133-repunit-nonfactors.english.md
index 01f3f15441..747b2431cb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-133-repunit-nonfactors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-133-repunit-nonfactors.english.md
@@ -23,7 +23,7 @@ Find the sum of all the primes below one-hundred thousand that will never be a f
 ```yml
 tests:
   - text: <code>euler133()</code> should return 453647705.
-    testString: 'assert.strictEqual(euler133(), 453647705, "<code>euler133()</code> should return 453647705.");'
+    testString: assert.strictEqual(euler133(), 453647705, '<code>euler133()</code> should return 453647705.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-134-prime-pair-connection.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-134-prime-pair-connection.english.md
index a8165044aa..5ec01b676e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-134-prime-pair-connection.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-134-prime-pair-connection.english.md
@@ -22,7 +22,7 @@ Find ∑ S for every pair of consecutive primes with 5 ≤ p1 ≤ 1000000.
 ```yml
 tests:
   - text: <code>euler134()</code> should return 18613426663617120.
-    testString: 'assert.strictEqual(euler134(), 18613426663617120, "<code>euler134()</code> should return 18613426663617120.");'
+    testString: assert.strictEqual(euler134(), 18613426663617120, '<code>euler134()</code> should return 18613426663617120.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-135-same-differences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-135-same-differences.english.md
index dcf4b6aa1e..d3eb538514 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-135-same-differences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-135-same-differences.english.md
@@ -23,7 +23,7 @@ How many values of n less than one million have exactly ten distinct solutions?
 ```yml
 tests:
   - text: <code>euler135()</code> should return 4989.
-    testString: 'assert.strictEqual(euler135(), 4989, "<code>euler135()</code> should return 4989.");'
+    testString: assert.strictEqual(euler135(), 4989, '<code>euler135()</code> should return 4989.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-136-singleton-difference.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-136-singleton-difference.english.md
index cbbb6f12b4..7fb84f3749 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-136-singleton-difference.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-136-singleton-difference.english.md
@@ -23,7 +23,7 @@ How many values of n less than fifty million have exactly one solution?
 ```yml
 tests:
   - text: <code>euler136()</code> should return 2544559.
-    testString: 'assert.strictEqual(euler136(), 2544559, "<code>euler136()</code> should return 2544559.");'
+    testString: assert.strictEqual(euler136(), 2544559, '<code>euler136()</code> should return 2544559.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-137-fibonacci-golden-nuggets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-137-fibonacci-golden-nuggets.english.md
index a20f540c41..f0ed25673e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-137-fibonacci-golden-nuggets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-137-fibonacci-golden-nuggets.english.md
@@ -41,7 +41,7 @@ Find the 15th golden nugget.
 ```yml
 tests:
   - text: <code>euler137()</code> should return 1120149658760.
-    testString: 'assert.strictEqual(euler137(), 1120149658760, "<code>euler137()</code> should return 1120149658760.");'
+    testString: assert.strictEqual(euler137(), 1120149658760, '<code>euler137()</code> should return 1120149658760.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-138-special-isosceles-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-138-special-isosceles-triangles.english.md
index cb10b7d3ea..0c54a59879 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-138-special-isosceles-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-138-special-isosceles-triangles.english.md
@@ -25,7 +25,7 @@ Find ∑ L for the twelve smallest isosceles triangles for which h = b ± 1 and
 ```yml
 tests:
   - text: <code>euler138()</code> should return 1118049290473932.
-    testString: 'assert.strictEqual(euler138(), 1118049290473932, "<code>euler138()</code> should return 1118049290473932.");'
+    testString: assert.strictEqual(euler138(), 1118049290473932, '<code>euler138()</code> should return 1118049290473932.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-139-pythagorean-tiles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-139-pythagorean-tiles.english.md
index 98a1c91ca6..bffe1d9afa 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-139-pythagorean-tiles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-139-pythagorean-tiles.english.md
@@ -25,7 +25,7 @@ Given that the perimeter of the right triangle is less than one-hundred million,
 ```yml
 tests:
   - text: <code>euler139()</code> should return 10057761.
-    testString: 'assert.strictEqual(euler139(), 10057761, "<code>euler139()</code> should return 10057761.");'
+    testString: assert.strictEqual(euler139(), 10057761, '<code>euler139()</code> should return 10057761.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-14-longest-collatz-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-14-longest-collatz-sequence.english.md
index 71e9c5d934..4e3916ebd7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-14-longest-collatz-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-14-longest-collatz-sequence.english.md
@@ -27,15 +27,15 @@ NOTE: Once the chain starts the terms are allowed to go above one million.
 ```yml
 tests:
   - text: <code>longestCollatzSequence(14)</code> should return 9.
-    testString: 'assert.strictEqual(longestCollatzSequence(14), 9, "<code>longestCollatzSequence(14)</code> should return 9.");'
+    testString: assert.strictEqual(longestCollatzSequence(14), 9, '<code>longestCollatzSequence(14)</code> should return 9.');
   - text: <code>longestCollatzSequence(5847)</code> should return 3711.
-    testString: 'assert.strictEqual(longestCollatzSequence(5847), 3711, "<code>longestCollatzSequence(5847)</code> should return 3711.");'
+    testString: assert.strictEqual(longestCollatzSequence(5847), 3711, '<code>longestCollatzSequence(5847)</code> should return 3711.');
   - text: <code>longestCollatzSequence(46500)</code> should return 35655.
-    testString: 'assert.strictEqual(longestCollatzSequence(46500), 35655, "<code>longestCollatzSequence(46500)</code> should return 35655.");'
+    testString: assert.strictEqual(longestCollatzSequence(46500), 35655, '<code>longestCollatzSequence(46500)</code> should return 35655.');
   - text: <code>longestCollatzSequence(54512)</code> should return 52527.
-    testString: 'assert.strictEqual(longestCollatzSequence(54512), 52527, "<code>longestCollatzSequence(54512)</code> should return 52527.");'
+    testString: assert.strictEqual(longestCollatzSequence(54512), 52527, '<code>longestCollatzSequence(54512)</code> should return 52527.');
   - text: <code>longestCollatzSequence(1000000)</code> should return 837799.
-    testString: 'assert.strictEqual(longestCollatzSequence(1000000), 837799, "<code>longestCollatzSequence(1000000)</code> should return 837799.");'
+    testString: assert.strictEqual(longestCollatzSequence(1000000), 837799, '<code>longestCollatzSequence(1000000)</code> should return 837799.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-140-modified-fibonacci-golden-nuggets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-140-modified-fibonacci-golden-nuggets.english.md
index 3c00cfd31f..47c1e0d306 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-140-modified-fibonacci-golden-nuggets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-140-modified-fibonacci-golden-nuggets.english.md
@@ -32,7 +32,7 @@ Find the sum of the first thirty golden nuggets.
 ```yml
 tests:
   - text: <code>euler140()</code> should return 5673835352990.
-    testString: 'assert.strictEqual(euler140(), 5673835352990, "<code>euler140()</code> should return 5673835352990.");'
+    testString: assert.strictEqual(euler140(), 5673835352990, '<code>euler140()</code> should return 5673835352990.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-141-investigating-progressive-numbers-n-which-are-also-square.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-141-investigating-progressive-numbers-n-which-are-also-square.english.md
index 6657a4eeda..ecc2a2085e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-141-investigating-progressive-numbers-n-which-are-also-square.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-141-investigating-progressive-numbers-n-which-are-also-square.english.md
@@ -24,7 +24,7 @@ Find the sum of all progressive perfect squares below one trillion (1012).
 ```yml
 tests:
   - text: <code>euler141()</code> should return 878454337159.
-    testString: 'assert.strictEqual(euler141(), 878454337159, "<code>euler141()</code> should return 878454337159.");'
+    testString: assert.strictEqual(euler141(), 878454337159, '<code>euler141()</code> should return 878454337159.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-142-perfect-square-collection.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-142-perfect-square-collection.english.md
index cdd317ed68..12f28d6a74 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-142-perfect-square-collection.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-142-perfect-square-collection.english.md
@@ -20,7 +20,7 @@ Find the smallest x + y + z with integers x > y > z > 0 such that x + y, x − y
 ```yml
 tests:
   - text: <code>euler142()</code> should return 1006193.
-    testString: 'assert.strictEqual(euler142(), 1006193, "<code>euler142()</code> should return 1006193.");'
+    testString: assert.strictEqual(euler142(), 1006193, '<code>euler142()</code> should return 1006193.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-143-investigating-the-torricelli-point-of-a-triangle.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-143-investigating-the-torricelli-point-of-a-triangle.english.md
index 3a49430b12..0cf9146ed5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-143-investigating-the-torricelli-point-of-a-triangle.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-143-investigating-the-torricelli-point-of-a-triangle.english.md
@@ -25,7 +25,7 @@ Find the sum of all distinct values of p + q + r ≤ 120000 for Torricelli trian
 ```yml
 tests:
   - text: <code>euler143()</code> should return 30758397.
-    testString: 'assert.strictEqual(euler143(), 30758397, "<code>euler143()</code> should return 30758397.");'
+    testString: assert.strictEqual(euler143(), 30758397, '<code>euler143()</code> should return 30758397.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-144-investigating-multiple-reflections-of-a-laser-beam.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-144-investigating-multiple-reflections-of-a-laser-beam.english.md
index 7e47d72ff9..99e8184813 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-144-investigating-multiple-reflections-of-a-laser-beam.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-144-investigating-multiple-reflections-of-a-laser-beam.english.md
@@ -29,7 +29,7 @@ How many times does the beam hit the internal surface of the white cell before e
 ```yml
 tests:
   - text: <code>euler144()</code> should return 354.
-    testString: 'assert.strictEqual(euler144(), 354, "<code>euler144()</code> should return 354.");'
+    testString: assert.strictEqual(euler144(), 354, '<code>euler144()</code> should return 354.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-145-how-many-reversible-numbers-are-there-below-one-billion.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-145-how-many-reversible-numbers-are-there-below-one-billion.english.md
index ca1e838a77..dd0f58d681 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-145-how-many-reversible-numbers-are-there-below-one-billion.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-145-how-many-reversible-numbers-are-there-below-one-billion.english.md
@@ -24,7 +24,7 @@ How many reversible numbers are there below one-billion (109)?
 ```yml
 tests:
   - text: <code>euler145()</code> should return 608720.
-    testString: 'assert.strictEqual(euler145(), 608720, "<code>euler145()</code> should return 608720.");'
+    testString: assert.strictEqual(euler145(), 608720, '<code>euler145()</code> should return 608720.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-146-investigating-a-prime-pattern.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-146-investigating-a-prime-pattern.english.md
index 1919672471..fa81096640 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-146-investigating-a-prime-pattern.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-146-investigating-a-prime-pattern.english.md
@@ -22,7 +22,7 @@ What is the sum of all such integers n below 150 million?
 ```yml
 tests:
   - text: <code>euler146()</code> should return 676333270.
-    testString: 'assert.strictEqual(euler146(), 676333270, "<code>euler146()</code> should return 676333270.");'
+    testString: assert.strictEqual(euler146(), 676333270, '<code>euler146()</code> should return 676333270.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-147-rectangles-in-cross-hatched-grids.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-147-rectangles-in-cross-hatched-grids.english.md
index ed983ef00a..0bfd070095 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-147-rectangles-in-cross-hatched-grids.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-147-rectangles-in-cross-hatched-grids.english.md
@@ -31,7 +31,7 @@ How many different rectangles could be situated within 47x43 and smaller grids?
 ```yml
 tests:
   - text: <code>euler147()</code> should return 846910284.
-    testString: 'assert.strictEqual(euler147(), 846910284, "<code>euler147()</code> should return 846910284.");'
+    testString: assert.strictEqual(euler147(), 846910284, '<code>euler147()</code> should return 846910284.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-148-exploring-pascals-triangle.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-148-exploring-pascals-triangle.english.md
index dac2ed8450..e6b5592e67 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-148-exploring-pascals-triangle.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-148-exploring-pascals-triangle.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4021000cf542c50ff14
 challengeType: 5
-title: 'Problem 148: Exploring Pascal"s triangle'
+title: 'Problem 148: Exploring Pascal''s triangle'
 ---
 
 ## Description
@@ -93,7 +93,7 @@ Find the number of entries which are not divisible by 7 in the first one billion
 ```yml
 tests:
   - text: <code>euler148()</code> should return 2129970655314432.
-    testString: 'assert.strictEqual(euler148(), 2129970655314432, "<code>euler148()</code> should return 2129970655314432.");'
+    testString: assert.strictEqual(euler148(), 2129970655314432, '<code>euler148()</code> should return 2129970655314432.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-149-searching-for-a-maximum-sum-subsequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-149-searching-for-a-maximum-sum-subsequence.english.md
index ed9724566d..498a0a1b8c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-149-searching-for-a-maximum-sum-subsequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-149-searching-for-a-maximum-sum-subsequence.english.md
@@ -36,7 +36,7 @@ Finally, find the greatest sum of (any number of) adjacent entries in any direct
 ```yml
 tests:
   - text: <code>euler149()</code> should return 52852124.
-    testString: 'assert.strictEqual(euler149(), 52852124, "<code>euler149()</code> should return 52852124.");'
+    testString: assert.strictEqual(euler149(), 52852124, '<code>euler149()</code> should return 52852124.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-15-lattice-paths.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-15-lattice-paths.english.md
index 8f5e0af317..bb2dc15469 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-15-lattice-paths.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-15-lattice-paths.english.md
@@ -24,11 +24,11 @@ How many such routes are there through a given <code>gridSize</code>?
 ```yml
 tests:
   - text: <code>latticePaths(4)</code> should return 70.
-    testString: 'assert.strictEqual(latticePaths(4), 70, "<code>latticePaths(4)</code> should return 70.");'
+    testString: assert.strictEqual(latticePaths(4), 70, '<code>latticePaths(4)</code> should return 70.');
   - text: <code>latticePaths(9)</code> should return 48620.
-    testString: 'assert.strictEqual(latticePaths(9), 48620, "<code>latticePaths(9)</code> should return 48620.");'
+    testString: assert.strictEqual(latticePaths(9), 48620, '<code>latticePaths(9)</code> should return 48620.');
   - text: <code>latticePaths(20)</code> should return 137846528820.
-    testString: 'assert.strictEqual(latticePaths(20), 137846528820, "<code>latticePaths(20)</code> should return 137846528820.");'
+    testString: assert.strictEqual(latticePaths(20), 137846528820, '<code>latticePaths(20)</code> should return 137846528820.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-150-searching-a-triangular-array-for-a-sub-triangle-having-minimum-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-150-searching-a-triangular-array-for-a-sub-triangle-having-minimum-sum.english.md
index f1b223dc3e..7893ecb2dd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-150-searching-a-triangular-array-for-a-sub-triangle-having-minimum-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-150-searching-a-triangular-array-for-a-sub-triangle-having-minimum-sum.english.md
@@ -45,7 +45,7 @@ Find the smallest possible sub-triangle sum.
 ```yml
 tests:
   - text: <code>euler150()</code> should return -271248680.
-    testString: 'assert.strictEqual(euler150(), -271248680, "<code>euler150()</code> should return -271248680.");'
+    testString: assert.strictEqual(euler150(), -271248680, '<code>euler150()</code> should return -271248680.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-151-paper-sheets-of-standard-sizes-an-expected-value-problem.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-151-paper-sheets-of-standard-sizes-an-expected-value-problem.english.md
index a9ebd87ed9..6aacd14d5b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-151-paper-sheets-of-standard-sizes-an-expected-value-problem.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-151-paper-sheets-of-standard-sizes-an-expected-value-problem.english.md
@@ -27,7 +27,7 @@ Give your answer rounded to six decimal places using the format x.xxxxxx .
 ```yml
 tests:
   - text: <code>euler151()</code> should return 0.464399.
-    testString: 'assert.strictEqual(euler151(), 0.464399, "<code>euler151()</code> should return 0.464399.");'
+    testString: assert.strictEqual(euler151(), 0.464399, '<code>euler151()</code> should return 0.464399.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-152-writing-one-half-as-a-sum-of-inverse-squares.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-152-writing-one-half-as-a-sum-of-inverse-squares.english.md
index b20c6ca1b1..53c8e36563 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-152-writing-one-half-as-a-sum-of-inverse-squares.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-152-writing-one-half-as-a-sum-of-inverse-squares.english.md
@@ -24,7 +24,7 @@ How many ways are there to write the number 1/2 as a sum of inverse squares usin
 ```yml
 tests:
   - text: <code>euler152()</code> should return 301.
-    testString: 'assert.strictEqual(euler152(), 301, "<code>euler152()</code> should return 301.");'
+    testString: assert.strictEqual(euler152(), 301, '<code>euler152()</code> should return 301.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-153-investigating-gaussian-integers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-153-investigating-gaussian-integers.english.md
index fa77f7518d..7a654ba871 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-153-investigating-gaussian-integers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-153-investigating-gaussian-integers.english.md
@@ -64,7 +64,7 @@ What is ∑ s(n) for 1 ≤ n ≤ 108?
 ```yml
 tests:
   - text: <code>euler153()</code> should return 17971254122360636.
-    testString: 'assert.strictEqual(euler153(), 17971254122360636, "<code>euler153()</code> should return 17971254122360636.");'
+    testString: assert.strictEqual(euler153(), 17971254122360636, '<code>euler153()</code> should return 17971254122360636.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-154-exploring-pascals-pyramid.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-154-exploring-pascals-pyramid.english.md
index 21c650c10a..3da3780015 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-154-exploring-pascals-pyramid.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-154-exploring-pascals-pyramid.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4071000cf542c50ff19
 challengeType: 5
-title: 'Problem 154: Exploring Pascal"s pyramid'
+title: 'Problem 154: Exploring Pascal''s pyramid'
 ---
 
 ## Description
@@ -27,7 +27,7 @@ How many coefficients in the expansion of (x + y + z)200000 are multiples of 101
 ```yml
 tests:
   - text: <code>euler154()</code> should return 479742450.
-    testString: 'assert.strictEqual(euler154(), 479742450, "<code>euler154()</code> should return 479742450.");'
+    testString: assert.strictEqual(euler154(), 479742450, '<code>euler154()</code> should return 479742450.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-155-counting-capacitor-circuits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-155-counting-capacitor-circuits.english.md
index bb2532cbf2..9e33843d24 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-155-counting-capacitor-circuits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-155-counting-capacitor-circuits.english.md
@@ -29,7 +29,7 @@ whereas when connecting them in series, the overall capacitance is given by:
 ```yml
 tests:
   - text: <code>euler155()</code> should return 3857447.
-    testString: 'assert.strictEqual(euler155(), 3857447, "<code>euler155()</code> should return 3857447.");'
+    testString: assert.strictEqual(euler155(), 3857447, '<code>euler155()</code> should return 3857447.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-156-counting-digits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-156-counting-digits.english.md
index 97a92b3cb8..ce0f8f84d0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-156-counting-digits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-156-counting-digits.english.md
@@ -52,7 +52,7 @@ Note: if, for some n, f(n,d)=n
 ```yml
 tests:
   - text: <code>euler156()</code> should return 21295121502550.
-    testString: 'assert.strictEqual(euler156(), 21295121502550, "<code>euler156()</code> should return 21295121502550.");'
+    testString: assert.strictEqual(euler156(), 21295121502550, '<code>euler156()</code> should return 21295121502550.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-157-solving-the-diophantine-equation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-157-solving-the-diophantine-equation.english.md
index b869d20f0e..f10e075ab4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-157-solving-the-diophantine-equation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-157-solving-the-diophantine-equation.english.md
@@ -42,7 +42,7 @@ How many solutions has this equation for 1 ≤ n ≤ 9?
 ```yml
 tests:
   - text: <code>euler157()</code> should return 53490.
-    testString: 'assert.strictEqual(euler157(), 53490, "<code>euler157()</code> should return 53490.");'
+    testString: assert.strictEqual(euler157(), 53490, '<code>euler157()</code> should return 53490.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-158-exploring-strings-for-which-only-one-character-comes-lexicographically-after-its-neighbour-to-the-left.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-158-exploring-strings-for-which-only-one-character-comes-lexicographically-after-its-neighbour-to-the-left.english.md
index da42075ee5..2cfd97e61d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-158-exploring-strings-for-which-only-one-character-comes-lexicographically-after-its-neighbour-to-the-left.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-158-exploring-strings-for-which-only-one-character-comes-lexicographically-after-its-neighbour-to-the-left.english.md
@@ -27,7 +27,7 @@ What is the maximum value of p(n)?
 ```yml
 tests:
   - text: <code>euler158()</code> should return 409511334375.
-    testString: 'assert.strictEqual(euler158(), 409511334375, "<code>euler158()</code> should return 409511334375.");'
+    testString: assert.strictEqual(euler158(), 409511334375, '<code>euler158()</code> should return 409511334375.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-159-digital-root-sums-of-factorisations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-159-digital-root-sums-of-factorisations.english.md
index d697b65a07..cf9b0be408 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-159-digital-root-sums-of-factorisations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-159-digital-root-sums-of-factorisations.english.md
@@ -45,7 +45,7 @@ Find ∑mdrs(n) for 1 < n < 1,000,000.
 ```yml
 tests:
   - text: <code>euler159()</code> should return 14489159.
-    testString: 'assert.strictEqual(euler159(), 14489159, "<code>euler159()</code> should return 14489159.");'
+    testString: assert.strictEqual(euler159(), 14489159, '<code>euler159()</code> should return 14489159.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-16-power-digit-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-16-power-digit-sum.english.md
index 0d85e5e797..8ed7a0d48a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-16-power-digit-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-16-power-digit-sum.english.md
@@ -21,11 +21,11 @@ What is the sum of the digits of the number 2<sup><code>exponent</code></sup>?
 ```yml
 tests:
   - text: <code>powerDigitSum(15)</code> should return 26.
-    testString: 'assert.strictEqual(powerDigitSum(15), 26, "<code>powerDigitSum(15)</code> should return 26.");'
+    testString: assert.strictEqual(powerDigitSum(15), 26, '<code>powerDigitSum(15)</code> should return 26.');
   - text: <code>powerDigitSum(128)</code> should return 166.
-    testString: 'assert.strictEqual(powerDigitSum(128), 166, "<code>powerDigitSum(128)</code> should return 166.");'
+    testString: assert.strictEqual(powerDigitSum(128), 166, '<code>powerDigitSum(128)</code> should return 166.');
   - text: <code>powerDigitSum(1000)</code> should return 1366.
-    testString: 'assert.strictEqual(powerDigitSum(1000), 1366, "<code>powerDigitSum(1000)</code> should return 1366.");'
+    testString: assert.strictEqual(powerDigitSum(1000), 1366, '<code>powerDigitSum(1000)</code> should return 1366.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-160-factorial-trailing-digits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-160-factorial-trailing-digits.english.md
index f5791b84ba..3e95107690 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-160-factorial-trailing-digits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-160-factorial-trailing-digits.english.md
@@ -25,7 +25,7 @@ Find f(1,000,000,000,000)
 ```yml
 tests:
   - text: <code>euler160()</code> should return 16576.
-    testString: 'assert.strictEqual(euler160(), 16576, "<code>euler160()</code> should return 16576.");'
+    testString: assert.strictEqual(euler160(), 16576, '<code>euler160()</code> should return 16576.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-161-triominoes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-161-triominoes.english.md
index 7a5d9ffa8f..fa3f2af792 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-161-triominoes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-161-triominoes.english.md
@@ -34,7 +34,7 @@ In how many ways can a 9 by 12 grid be tiled in this way by triominoes?
 ```yml
 tests:
   - text: <code>euler161()</code> should return 20574308184277972.
-    testString: 'assert.strictEqual(euler161(), 20574308184277972, "<code>euler161()</code> should return 20574308184277972.");'
+    testString: assert.strictEqual(euler161(), 20574308184277972, '<code>euler161()</code> should return 20574308184277972.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-162-hexadecimal-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-162-hexadecimal-numbers.english.md
index 1b3c35a21c..bd2e9c751a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-162-hexadecimal-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-162-hexadecimal-numbers.english.md
@@ -27,7 +27,7 @@ Give your answer as a hexadecimal number.
 ```yml
 tests:
   - text: <code>euler162()</code> should return 3D58725572C62302.
-    testString: 'assert.strictEqual(euler162(), 3D58725572C62302, "<code>euler162()</code> should return 3D58725572C62302.");'
+    testString: assert.strictEqual(euler162(), 3D58725572C62302, '<code>euler162()</code> should return 3D58725572C62302.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-163-cross-hatched-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-163-cross-hatched-triangles.english.md
index e109766d4c..47eb4e958f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-163-cross-hatched-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-163-cross-hatched-triangles.english.md
@@ -27,7 +27,7 @@ Find T(36).
 ```yml
 tests:
   - text: <code>euler163()</code> should return 343047.
-    testString: 'assert.strictEqual(euler163(), 343047, "<code>euler163()</code> should return 343047.");'
+    testString: assert.strictEqual(euler163(), 343047, '<code>euler163()</code> should return 343047.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-164-numbers-for-which-no-three-consecutive-digits-have-a-sum-greater-than-a-given-value.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-164-numbers-for-which-no-three-consecutive-digits-have-a-sum-greater-than-a-given-value.english.md
index 6cb9cfa4c6..1de0af9aa6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-164-numbers-for-which-no-three-consecutive-digits-have-a-sum-greater-than-a-given-value.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-164-numbers-for-which-no-three-consecutive-digits-have-a-sum-greater-than-a-given-value.english.md
@@ -20,7 +20,7 @@ How many 20 digit numbers n (without any leading zero) exist such that no three
 ```yml
 tests:
   - text: <code>euler164()</code> should return 378158756814587.
-    testString: 'assert.strictEqual(euler164(), 378158756814587, "<code>euler164()</code> should return 378158756814587.");'
+    testString: assert.strictEqual(euler164(), 378158756814587, '<code>euler164()</code> should return 378158756814587.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-165-intersections.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-165-intersections.english.md
index 2cd11be6a7..02e76ddb31 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-165-intersections.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-165-intersections.english.md
@@ -37,7 +37,7 @@ How many distinct true intersection points are found among the 5000 line segment
 ```yml
 tests:
   - text: <code>euler165()</code> should return 2868868.
-    testString: 'assert.strictEqual(euler165(), 2868868, "<code>euler165()</code> should return 2868868.");'
+    testString: assert.strictEqual(euler165(), 2868868, '<code>euler165()</code> should return 2868868.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-166-criss-cross.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-166-criss-cross.english.md
index f2794cb156..e6600c422b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-166-criss-cross.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-166-criss-cross.english.md
@@ -32,7 +32,7 @@ In how many ways can you fill a 4x4 grid with the digits d, 0 ≤ d ≤ 9 so tha
 ```yml
 tests:
   - text: <code>euler166()</code> should return 7130034.
-    testString: 'assert.strictEqual(euler166(), 7130034, "<code>euler166()</code> should return 7130034.");'
+    testString: assert.strictEqual(euler166(), 7130034, '<code>euler166()</code> should return 7130034.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-167-investigating-ulam-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-167-investigating-ulam-sequences.english.md
index 123559f6f0..30621a833b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-167-investigating-ulam-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-167-investigating-ulam-sequences.english.md
@@ -25,7 +25,7 @@ Find ∑U(2,2n+1)k for 2 ≤ n ≤10, where k = 1011.
 ```yml
 tests:
   - text: <code>euler167()</code> should return 3916160068885.
-    testString: 'assert.strictEqual(euler167(), 3916160068885, "<code>euler167()</code> should return 3916160068885.");'
+    testString: assert.strictEqual(euler167(), 3916160068885, '<code>euler167()</code> should return 3916160068885.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-168-number-rotations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-168-number-rotations.english.md
index 560bf9a111..439e1766e1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-168-number-rotations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-168-number-rotations.english.md
@@ -23,7 +23,7 @@ Find the last 5 digits of the sum of all integers n, 10 < n < 10100, that have t
 ```yml
 tests:
   - text: <code>euler168()</code> should return 59206.
-    testString: 'assert.strictEqual(euler168(), 59206, "<code>euler168()</code> should return 59206.");'
+    testString: assert.strictEqual(euler168(), 59206, '<code>euler168()</code> should return 59206.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-169-exploring-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-169-exploring-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md
index 94ef78fdb8..7af7e03d95 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-169-exploring-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-169-exploring-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md
@@ -26,7 +26,7 @@ What is f(1025)?
 ```yml
 tests:
   - text: <code>euler169()</code> should return 178653872807.
-    testString: 'assert.strictEqual(euler169(), 178653872807, "<code>euler169()</code> should return 178653872807.");'
+    testString: assert.strictEqual(euler169(), 178653872807, '<code>euler169()</code> should return 178653872807.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-17-number-letter-counts.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-17-number-letter-counts.english.md
index fde34f8b5c..875e8c8f7d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-17-number-letter-counts.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-17-number-letter-counts.english.md
@@ -22,11 +22,11 @@ If all the numbers from 1 to given <code>limit</code> inclusive were written out
 ```yml
 tests:
   - text: <code>numberLetterCounts(5)</code> should return 19.
-    testString: 'assert.strictEqual(numberLetterCounts(5), 19, "<code>numberLetterCounts(5)</code> should return 19.");'
+    testString: assert.strictEqual(numberLetterCounts(5), 19, '<code>numberLetterCounts(5)</code> should return 19.');
   - text: <code>numberLetterCounts(150)</code> should return 1903.
-    testString: 'assert.strictEqual(numberLetterCounts(150), 1903, "<code>numberLetterCounts(150)</code> should return 1903.");'
+    testString: assert.strictEqual(numberLetterCounts(150), 1903, '<code>numberLetterCounts(150)</code> should return 1903.');
   - text: <code>numberLetterCounts(1000)</code> should return 21124.
-    testString: 'assert.strictEqual(numberLetterCounts(1000), 21124, "<code>numberLetterCounts(1000)</code> should return 21124.");'
+    testString: assert.strictEqual(numberLetterCounts(1000), 21124, '<code>numberLetterCounts(1000)</code> should return 21124.');
 
 ```
 
@@ -59,7 +59,7 @@ numberLetterCounts(5);
 ```js
 function numberLetterCounts(limit) {
   const dictionary = {
-    0: ",
+    0: '',
     1: 'one',
     2: 'two',
     3: 'three',
@@ -90,7 +90,7 @@ function numberLetterCounts(limit) {
     1000: 'onethousand'
   };
 
-  let numString = ";
+  let numString = '';
 
   function convertToString(num) {
     // check dictionary for number
@@ -101,7 +101,7 @@ function numberLetterCounts(limit) {
       const tens =  Math.floor((num / 10) % 10) * 10;
       const remainder = num % 10;
 
-      let tempStr = ";
+      let tempStr = '';
 
       if (hundreds === 0) {
         tempStr += dictionary[tens] + dictionary[remainder];
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-170-find-the-largest-0-to-9-pandigital-that-can-be-formed-by-concatenating-products.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-170-find-the-largest-0-to-9-pandigital-that-can-be-formed-by-concatenating-products.english.md
index 9eb94e2a2d..0d61f4e784 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-170-find-the-largest-0-to-9-pandigital-that-can-be-formed-by-concatenating-products.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-170-find-the-largest-0-to-9-pandigital-that-can-be-formed-by-concatenating-products.english.md
@@ -29,7 +29,7 @@ What is the largest 0 to 9 pandigital 10-digit concatenated product of an intege
 ```yml
 tests:
   - text: <code>euler170()</code> should return 9857164023.
-    testString: 'assert.strictEqual(euler170(), 9857164023, "<code>euler170()</code> should return 9857164023.");'
+    testString: assert.strictEqual(euler170(), 9857164023, '<code>euler170()</code> should return 9857164023.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-171-finding-numbers-for-which-the-sum-of-the-squares-of-the-digits-is-a-square.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-171-finding-numbers-for-which-the-sum-of-the-squares-of-the-digits-is-a-square.english.md
index a372624d2c..9b271a790d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-171-finding-numbers-for-which-the-sum-of-the-squares-of-the-digits-is-a-square.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-171-finding-numbers-for-which-the-sum-of-the-squares-of-the-digits-is-a-square.english.md
@@ -24,7 +24,7 @@ Find the last nine digits of the sum of all n, 0 < n < 1020, such that f(n) is a
 ```yml
 tests:
   - text: <code>euler171()</code> should return 142989277.
-    testString: 'assert.strictEqual(euler171(), 142989277, "<code>euler171()</code> should return 142989277.");'
+    testString: assert.strictEqual(euler171(), 142989277, '<code>euler171()</code> should return 142989277.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-172-investigating-numbers-with-few-repeated-digits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-172-investigating-numbers-with-few-repeated-digits.english.md
index 3fe21a22ef..aa4e08fe85 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-172-investigating-numbers-with-few-repeated-digits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-172-investigating-numbers-with-few-repeated-digits.english.md
@@ -20,7 +20,7 @@ How many 18-digit numbers n (without leading zeros) are there such that no digit
 ```yml
 tests:
   - text: <code>euler172()</code> should return 227485267000992000.
-    testString: 'assert.strictEqual(euler172(), 227485267000992000, "<code>euler172()</code> should return 227485267000992000.");'
+    testString: assert.strictEqual(euler172(), 227485267000992000, '<code>euler172()</code> should return 227485267000992000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-173-using-up-to-one-million-tiles-how-many-different-hollow-square-laminae-can-be-formed.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-173-using-up-to-one-million-tiles-how-many-different-hollow-square-laminae-can-be-formed.english.md
index 11e22ef769..10a06a250c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-173-using-up-to-one-million-tiles-how-many-different-hollow-square-laminae-can-be-formed.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-173-using-up-to-one-million-tiles-how-many-different-hollow-square-laminae-can-be-formed.english.md
@@ -24,7 +24,7 @@ Using up to one million tiles how many different square laminae can be formed?
 ```yml
 tests:
   - text: <code>euler173()</code> should return 1572729.
-    testString: 'assert.strictEqual(euler173(), 1572729, "<code>euler173()</code> should return 1572729.");'
+    testString: assert.strictEqual(euler173(), 1572729, '<code>euler173()</code> should return 1572729.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-174-counting-the-number-of-hollow-square-laminae-that-can-form-one-two-three-...-distinct-arrangements.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-174-counting-the-number-of-hollow-square-laminae-that-can-form-one-two-three-...-distinct-arrangements.english.md
index 5ef8aabac0..34d285dc08 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-174-counting-the-number-of-hollow-square-laminae-that-can-form-one-two-three-...-distinct-arrangements.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-174-counting-the-number-of-hollow-square-laminae-that-can-form-one-two-three-...-distinct-arrangements.english.md
@@ -26,7 +26,7 @@ What is ∑ N(n) for 1 ≤ n ≤ 10?
 ```yml
 tests:
   - text: <code>euler174()</code> should return 209566.
-    testString: 'assert.strictEqual(euler174(), 209566, "<code>euler174()</code> should return 209566.");'
+    testString: assert.strictEqual(euler174(), 209566, '<code>euler174()</code> should return 209566.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-175-fractions-involving-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-175-fractions-involving-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md
index c21d2e5eba..03d8899a36 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-175-fractions-involving-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-175-fractions-involving-the-number-of-different-ways-a-number-can-be-expressed-as-a-sum-of-powers-of-2.english.md
@@ -28,8 +28,8 @@ Give your answer as comma separated integers, without any whitespaces.
 
 ```yml
 tests:
-  - text: '<code>euler175()</code> should return 1, 13717420, 8.'
-    testString: 'assert.strictEqual(euler175(), 1, 13717420, 8, "<code>euler175()</code> should return 1, 13717420, 8.");'
+  - text: <code>euler175()</code> should return 1, 13717420, 8.
+    testString: assert.strictEqual(euler175(), 1, 13717420, 8, '<code>euler175()</code> should return 1, 13717420, 8.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-176-right-angled-triangles-that-share-a-cathetus.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-176-right-angled-triangles-that-share-a-cathetus.english.md
index 1756882f8d..64efbeadb6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-176-right-angled-triangles-that-share-a-cathetus.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-176-right-angled-triangles-that-share-a-cathetus.english.md
@@ -21,7 +21,7 @@ Find the smallest integer that can be the length of a cathetus of exactly 47547
 ```yml
 tests:
   - text: <code>euler176()</code> should return 96818198400000.
-    testString: 'assert.strictEqual(euler176(), 96818198400000, "<code>euler176()</code> should return 96818198400000.");'
+    testString: assert.strictEqual(euler176(), 96818198400000, '<code>euler176()</code> should return 96818198400000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-177-integer-angled-quadrilaterals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-177-integer-angled-quadrilaterals.english.md
index e014960b63..ff47e6873b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-177-integer-angled-quadrilaterals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-177-integer-angled-quadrilaterals.english.md
@@ -25,7 +25,7 @@ Note: In your calculations you may assume that a calculated angle is integral if
 ```yml
 tests:
   - text: <code>euler177()</code> should return 129325.
-    testString: 'assert.strictEqual(euler177(), 129325, "<code>euler177()</code> should return 129325.");'
+    testString: assert.strictEqual(euler177(), 129325, '<code>euler177()</code> should return 129325.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-178-step-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-178-step-numbers.english.md
index 4f4d61f2ee..81bcd1adf7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-178-step-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-178-step-numbers.english.md
@@ -25,7 +25,7 @@ How many pandigital step numbers less than 1040 are there?
 ```yml
 tests:
   - text: <code>euler178()</code> should return 126461847755.
-    testString: 'assert.strictEqual(euler178(), 126461847755, "<code>euler178()</code> should return 126461847755.");'
+    testString: assert.strictEqual(euler178(), 126461847755, '<code>euler178()</code> should return 126461847755.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-179-consecutive-positive-divisors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-179-consecutive-positive-divisors.english.md
index 2d58311ab4..dc73e90876 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-179-consecutive-positive-divisors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-179-consecutive-positive-divisors.english.md
@@ -20,7 +20,7 @@ Find the number of integers 1 < n < 107, for which n and n + 1 have the same num
 ```yml
 tests:
   - text: <code>euler179()</code> should return 986262.
-    testString: 'assert.strictEqual(euler179(), 986262, "<code>euler179()</code> should return 986262.");'
+    testString: assert.strictEqual(euler179(), 986262, '<code>euler179()</code> should return 986262.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-18-maximum-path-sum-i.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-18-maximum-path-sum-i.english.md
index b3ffd67a40..bcddda37e1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-18-maximum-path-sum-i.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-18-maximum-path-sum-i.english.md
@@ -25,9 +25,9 @@ Find the maximum total from top to bottom of the triangle below:
 ```yml
 tests:
   - text: <code>maximumPathSumI(testTriangle)</code> should return 23.
-    testString: 'assert.strictEqual(maximumPathSumI(testTriangle), 23, "<code>maximumPathSumI(testTriangle)</code> should return 23.");'
+    testString: assert.strictEqual(maximumPathSumI(testTriangle), 23, '<code>maximumPathSumI(testTriangle)</code> should return 23.');
   - text: <code>maximumPathSumI(numTriangle)</code> should return 1074.
-    testString: 'assert.strictEqual(maximumPathSumI(numTriangle), 1074, "<code>maximumPathSumI(numTriangle)</code> should return 1074.");'
+    testString: assert.strictEqual(maximumPathSumI(numTriangle), 1074, '<code>maximumPathSumI(numTriangle)</code> should return 1074.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-180-rational-zeros-of-a-function-of-three-variables.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-180-rational-zeros-of-a-function-of-three-variables.english.md
index 00be8a76a5..5b09aa5294 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-180-rational-zeros-of-a-function-of-three-variables.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-180-rational-zeros-of-a-function-of-three-variables.english.md
@@ -28,7 +28,7 @@ Find u + v.
 ```yml
 tests:
   - text: <code>euler180()</code> should return 285196020571078980.
-    testString: 'assert.strictEqual(euler180(), 285196020571078980, "<code>euler180()</code> should return 285196020571078980.");'
+    testString: assert.strictEqual(euler180(), 285196020571078980, '<code>euler180()</code> should return 285196020571078980.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-181-investigating-in-how-many-ways-objects-of-two-different-colours-can-be-grouped.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-181-investigating-in-how-many-ways-objects-of-two-different-colours-can-be-grouped.english.md
index 6ba48f1664..d549340e76 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-181-investigating-in-how-many-ways-objects-of-two-different-colours-can-be-grouped.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-181-investigating-in-how-many-ways-objects-of-two-different-colours-can-be-grouped.english.md
@@ -23,7 +23,7 @@ In how many ways can sixty black objects B and forty white objects W be  thus gr
 ```yml
 tests:
   - text: <code>euler181()</code> should return 83735848679360670.
-    testString: 'assert.strictEqual(euler181(), 83735848679360670, "<code>euler181()</code> should return 83735848679360670.");'
+    testString: assert.strictEqual(euler181(), 83735848679360670, '<code>euler181()</code> should return 83735848679360670.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-182-rsa-encryption.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-182-rsa-encryption.english.md
index b2cbff9b09..e28820836d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-182-rsa-encryption.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-182-rsa-encryption.english.md
@@ -34,7 +34,7 @@ Find the sum of all values of e, 1<e<φ(1009,3643) and gcd(e,φ)=1, so that the
 ```yml
 tests:
   - text: <code>euler182()</code> should return 399788195976.
-    testString: 'assert.strictEqual(euler182(), 399788195976, "<code>euler182()</code> should return 399788195976.");'
+    testString: assert.strictEqual(euler182(), 399788195976, '<code>euler182()</code> should return 399788195976.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-183-maximum-product-of-parts.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-183-maximum-product-of-parts.english.md
index be633ccb4e..56f12c04f4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-183-maximum-product-of-parts.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-183-maximum-product-of-parts.english.md
@@ -35,7 +35,7 @@ Find ΣD(N) for 5 ≤ N ≤ 10000.
 ```yml
 tests:
   - text: <code>euler183()</code> should return 48861552.
-    testString: 'assert.strictEqual(euler183(), 48861552, "<code>euler183()</code> should return 48861552.");'
+    testString: assert.strictEqual(euler183(), 48861552, '<code>euler183()</code> should return 48861552.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-184-triangles-containing-the-origin.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-184-triangles-containing-the-origin.english.md
index 3623fe39a0..924681e0ce 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-184-triangles-containing-the-origin.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-184-triangles-containing-the-origin.english.md
@@ -26,7 +26,7 @@ How many triangles are there containing the origin in the interior and having al
 ```yml
 tests:
   - text: <code>euler184()</code> should return 1725323624056.
-    testString: 'assert.strictEqual(euler184(), 1725323624056, "<code>euler184()</code> should return 1725323624056.");'
+    testString: assert.strictEqual(euler184(), 1725323624056, '<code>euler184()</code> should return 1725323624056.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-185-number-mind.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-185-number-mind.english.md
index 7ffc19ee77..080f284bba 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-185-number-mind.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-185-number-mind.english.md
@@ -57,7 +57,7 @@ Find the unique 16-digit secret sequence.
 ```yml
 tests:
   - text: <code>euler185()</code> should return 4640261571849533.
-    testString: 'assert.strictEqual(euler185(), 4640261571849533, "<code>euler185()</code> should return 4640261571849533.");'
+    testString: assert.strictEqual(euler185(), 4640261571849533, '<code>euler185()</code> should return 4640261571849533.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-186-connectedness-of-a-network.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-186-connectedness-of-a-network.english.md
index ef10979688..415794964f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-186-connectedness-of-a-network.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-186-connectedness-of-a-network.english.md
@@ -32,7 +32,7 @@ The Prime Minister's phone number is 524287. After how many successful calls, no
 ```yml
 tests:
   - text: <code>euler186()</code> should return 2325629.
-    testString: 'assert.strictEqual(euler186(), 2325629, "<code>euler186()</code> should return 2325629.");'
+    testString: assert.strictEqual(euler186(), 2325629, '<code>euler186()</code> should return 2325629.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-187-semiprimes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-187-semiprimes.english.md
index a683a03321..17bcdd29b0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-187-semiprimes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-187-semiprimes.english.md
@@ -25,7 +25,7 @@ How many composite integers, n < 108, have precisely two, not necessarily distin
 ```yml
 tests:
   - text: <code>euler187()</code> should return 17427258.
-    testString: 'assert.strictEqual(euler187(), 17427258, "<code>euler187()</code> should return 17427258.");'
+    testString: assert.strictEqual(euler187(), 17427258, '<code>euler187()</code> should return 17427258.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-188-the-hyperexponentiation-of-a-number.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-188-the-hyperexponentiation-of-a-number.english.md
index 644a667564..72b56cf9c4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-188-the-hyperexponentiation-of-a-number.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-188-the-hyperexponentiation-of-a-number.english.md
@@ -25,7 +25,7 @@ Find the last 8 digits of 1777↑↑1855.
 ```yml
 tests:
   - text: <code>euler188()</code> should return 95962097.
-    testString: 'assert.strictEqual(euler188(), 95962097, "<code>euler188()</code> should return 95962097.");'
+    testString: assert.strictEqual(euler188(), 95962097, '<code>euler188()</code> should return 95962097.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-189-tri-colouring-a-triangular-grid.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-189-tri-colouring-a-triangular-grid.english.md
index bd583f5544..f6a16e346b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-189-tri-colouring-a-triangular-grid.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-189-tri-colouring-a-triangular-grid.english.md
@@ -32,7 +32,7 @@ How many distinct valid colourings are there for the above configuration?
 ```yml
 tests:
   - text: <code>euler189()</code> should return 10834893628237824.
-    testString: 'assert.strictEqual(euler189(), 10834893628237824, "<code>euler189()</code> should return 10834893628237824.");'
+    testString: assert.strictEqual(euler189(), 10834893628237824, '<code>euler189()</code> should return 10834893628237824.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-19-counting-sundays.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-19-counting-sundays.english.md
index 54f0300cb3..8827f15a16 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-19-counting-sundays.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-19-counting-sundays.english.md
@@ -21,12 +21,12 @@ How many Sundays fell on the first of the month during the twentieth century (1
 
 ```yml
 tests:
-  - text: '<code>countingSundays(1943, 1946)</code> should return 6.'
-    testString: 'assert.strictEqual(countingSundays(1943, 1946), 6, "<code>countingSundays(1943, 1946)</code> should return 6.");'
-  - text: '<code>countingSundays(1995, 2000)</code> should return 10.'
-    testString: 'assert.strictEqual(countingSundays(1995, 2000), 10, "<code>countingSundays(1995, 2000)</code> should return 10.");'
-  - text: '<code>countingSundays(1901, 2000)</code> should return 171.'
-    testString: 'assert.strictEqual(countingSundays(1901, 2000), 171, "<code>countingSundays(1901, 2000)</code> should return 171.");'
+  - text: <code>countingSundays(1943, 1946)</code> should return 6.
+    testString: assert.strictEqual(countingSundays(1943, 1946), 6, '<code>countingSundays(1943, 1946)</code> should return 6.');
+  - text: <code>countingSundays(1995, 2000)</code> should return 10.
+    testString: assert.strictEqual(countingSundays(1995, 2000), 10, '<code>countingSundays(1995, 2000)</code> should return 10.');
+  - text: <code>countingSundays(1901, 2000)</code> should return 171.
+    testString: assert.strictEqual(countingSundays(1901, 2000), 171, '<code>countingSundays(1901, 2000)</code> should return 171.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-190-maximising-a-weighted-product.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-190-maximising-a-weighted-product.english.md
index 91c3c98b7b..31c551b504 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-190-maximising-a-weighted-product.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-190-maximising-a-weighted-product.english.md
@@ -24,7 +24,7 @@ Find Σ[Pm] for 2 ≤ m ≤ 15.
 ```yml
 tests:
   - text: <code>euler190()</code> should return 371048281.
-    testString: 'assert.strictEqual(euler190(), 371048281, "<code>euler190()</code> should return 371048281.");'
+    testString: assert.strictEqual(euler190(), 371048281, '<code>euler190()</code> should return 371048281.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-191-prize-strings.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-191-prize-strings.english.md
index 4c6ac01947..8a3c41e895 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-191-prize-strings.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-191-prize-strings.english.md
@@ -32,7 +32,7 @@ How many "prize" strings exist over a 30-day period?
 ```yml
 tests:
   - text: <code>euler191()</code> should return 1918080160.
-    testString: 'assert.strictEqual(euler191(), 1918080160, "<code>euler191()</code> should return 1918080160.");'
+    testString: assert.strictEqual(euler191(), 1918080160, '<code>euler191()</code> should return 1918080160.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-192-best-approximations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-192-best-approximations.english.md
index 867eb9d491..fa2af21267 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-192-best-approximations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-192-best-approximations.english.md
@@ -27,7 +27,7 @@ Find the sum of all denominators of the best approximations to √n for the deno
 ```yml
 tests:
   - text: <code>euler192()</code> should return 57060635927998344.
-    testString: 'assert.strictEqual(euler192(), 57060635927998344, "<code>euler192()</code> should return 57060635927998344.");'
+    testString: assert.strictEqual(euler192(), 57060635927998344, '<code>euler192()</code> should return 57060635927998344.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-193-squarefree-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-193-squarefree-numbers.english.md
index d1a2097b78..50d2745299 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-193-squarefree-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-193-squarefree-numbers.english.md
@@ -22,7 +22,7 @@ How many squarefree numbers are there below 250?
 ```yml
 tests:
   - text: <code>euler193()</code> should return 684465067343069.
-    testString: 'assert.strictEqual(euler193(), 684465067343069, "<code>euler193()</code> should return 684465067343069.");'
+    testString: assert.strictEqual(euler193(), 684465067343069, '<code>euler193()</code> should return 684465067343069.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-194-coloured-configurations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-194-coloured-configurations.english.md
index 72d447ab4c..0179aea07d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-194-coloured-configurations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-194-coloured-configurations.english.md
@@ -30,7 +30,7 @@ Find the last 8 digits of N(25,75,1984).
 ```yml
 tests:
   - text: <code>euler194()</code> should return 61190912.
-    testString: 'assert.strictEqual(euler194(), 61190912, "<code>euler194()</code> should return 61190912.");'
+    testString: assert.strictEqual(euler194(), 61190912, '<code>euler194()</code> should return 61190912.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-195-inscribed-circles-of-triangles-with-one-angle-of-60-degrees.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-195-inscribed-circles-of-triangles-with-one-angle-of-60-degrees.english.md
index c424438801..ca2c85de7a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-195-inscribed-circles-of-triangles-with-one-angle-of-60-degrees.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-195-inscribed-circles-of-triangles-with-one-angle-of-60-degrees.english.md
@@ -26,7 +26,7 @@ Find T(1053779).
 ```yml
 tests:
   - text: <code>euler195()</code> should return 75085391.
-    testString: 'assert.strictEqual(euler195(), 75085391, "<code>euler195()</code> should return 75085391.");'
+    testString: assert.strictEqual(euler195(), 75085391, '<code>euler195()</code> should return 75085391.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-196-prime-triplets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-196-prime-triplets.english.md
index 75816b247b..9a8534ae47 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-196-prime-triplets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-196-prime-triplets.english.md
@@ -46,7 +46,7 @@ Find  S(5678027) + S(7208785).
 ```yml
 tests:
   - text: <code>euler196()</code> should return 322303240771079940.
-    testString: 'assert.strictEqual(euler196(), 322303240771079940, "<code>euler196()</code> should return 322303240771079940.");'
+    testString: assert.strictEqual(euler196(), 322303240771079940, '<code>euler196()</code> should return 322303240771079940.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-197-investigating-the-behaviour-of-a-recursively-defined-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-197-investigating-the-behaviour-of-a-recursively-defined-sequence.english.md
index 54c5359f28..c385d043ac 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-197-investigating-the-behaviour-of-a-recursively-defined-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-197-investigating-the-behaviour-of-a-recursively-defined-sequence.english.md
@@ -24,7 +24,7 @@ Give your answer with 9 digits after the decimal point.
 ```yml
 tests:
   - text: <code>euler197()</code> should return 1.710637717.
-    testString: 'assert.strictEqual(euler197(), 1.710637717, "<code>euler197()</code> should return 1.710637717.");'
+    testString: assert.strictEqual(euler197(), 1.710637717, '<code>euler197()</code> should return 1.710637717.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-198-ambiguous-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-198-ambiguous-numbers.english.md
index 79f79926f6..e65910f744 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-198-ambiguous-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-198-ambiguous-numbers.english.md
@@ -26,7 +26,7 @@ How many ambiguous numbers x = p/q,
 ```yml
 tests:
   - text: <code>euler198()</code> should return 52374425.
-    testString: 'assert.strictEqual(euler198(), 52374425, "<code>euler198()</code> should return 52374425.");'
+    testString: assert.strictEqual(euler198(), 52374425, '<code>euler198()</code> should return 52374425.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-199-iterative-circle-packing.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-199-iterative-circle-packing.english.md
index 3aa1a2a3a4..d2fa28a6c1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-199-iterative-circle-packing.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-199-iterative-circle-packing.english.md
@@ -28,7 +28,7 @@ Give your answer rounded to eight decimal places using the format x.xxxxxxxx .
 ```yml
 tests:
   - text: <code>euler199()</code> should return 0.00396087.
-    testString: 'assert.strictEqual(euler199(), 0.00396087, "<code>euler199()</code> should return 0.00396087.");'
+    testString: assert.strictEqual(euler199(), 0.00396087, '<code>euler199()</code> should return 0.00396087.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-2-even-fibonacci-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-2-even-fibonacci-numbers.english.md
index 0bcecde951..d419108c59 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-2-even-fibonacci-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-2-even-fibonacci-numbers.english.md
@@ -22,15 +22,15 @@ By considering the terms in the Fibonacci sequence whose values do not exceed <c
 ```yml
 tests:
   - text: <code>fiboEvenSum(10)</code> should return 188.
-    testString: 'assert.strictEqual(fiboEvenSum(10), 188, "<code>fiboEvenSum(10)</code> should return 188.");'
+    testString: assert.strictEqual(fiboEvenSum(10), 188, '<code>fiboEvenSum(10)</code> should return 188.');
   - text: <code>fiboEvenSum(23)</code> should return 60696.
-    testString: 'assert.strictEqual(fiboEvenSum(23), 60696, "<code>fiboEvenSum(23)</code> should return 60696.");'
+    testString: assert.strictEqual(fiboEvenSum(23), 60696, '<code>fiboEvenSum(23)</code> should return 60696.');
   - text: <code>fiboEvenSum(43)</code> should return 1485607536.
-    testString: 'assert.strictEqual(fiboEvenSum(43), 1485607536, "<code>fiboEvenSum(43)</code> should return 1485607536.");'
+    testString: assert.strictEqual(fiboEvenSum(43), 1485607536, '<code>fiboEvenSum(43)</code> should return 1485607536.');
   - text: Your function is not returning the correct result using our tests values.
-    testString: 'assert.strictEqual(fiboEvenSum(18), 3382, "Your function is not returning the correct result using our tests values.");'
+    testString: assert.strictEqual(fiboEvenSum(18), 3382, 'Your function is not returning the correct result using our tests values.');
   - text: Your function should return an <code>even</code> value.
-    testString: 'assert.equal(fiboEvenSum(31) % 2 === 0, true, "Your function should return an <code>even</code> value.");'
+    testString: assert.equal(fiboEvenSum(31) % 2 === 0, true, 'Your function should return an <code>even</code> value.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
index 8402a6014e..aff2aa9c4b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-20-factorial-digit-sum.english.md
@@ -22,15 +22,15 @@ Find the sum of the digits <var>n</var>!
 ```yml
 tests:
   - text: <code>sumFactorialDigits(10)</code> should return 27.
-    testString: 'assert.strictEqual(sumFactorialDigits(10), 27, "<code>sumFactorialDigits(10)</code> should return 27.");'
+    testString: assert.strictEqual(sumFactorialDigits(10), 27, '<code>sumFactorialDigits(10)</code> should return 27.');
   - text: <code>sumFactorialDigits(25)</code> should return 72.
-    testString: 'assert.strictEqual(sumFactorialDigits(25), 72, "<code>sumFactorialDigits(25)</code> should return 72.");'
+    testString: assert.strictEqual(sumFactorialDigits(25), 72, '<code>sumFactorialDigits(25)</code> should return 72.');
   - text: <code>sumFactorialDigits(50)</code> should return 216.
-    testString: 'assert.strictEqual(sumFactorialDigits(50), 216, "<code>sumFactorialDigits(50)</code> should return 216.");'
+    testString: assert.strictEqual(sumFactorialDigits(50), 216, '<code>sumFactorialDigits(50)</code> should return 216.');
   - text: <code>sumFactorialDigits(75)</code> should return 432.
-    testString: 'assert.strictEqual(sumFactorialDigits(75), 432, "<code>sumFactorialDigits(75)</code> should return 432.");'
+    testString: assert.strictEqual(sumFactorialDigits(75), 432, '<code>sumFactorialDigits(75)</code> should return 432.');
   - text: <code>sumFactorialDigits(100)</code> should return 648.
-    testString: 'assert.strictEqual(sumFactorialDigits(100), 648, "<code>sumFactorialDigits(100)</code> should return 648.");'
+    testString: assert.strictEqual(sumFactorialDigits(100), 648, '<code>sumFactorialDigits(100)</code> should return 648.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-200-find-the-200th-prime-proof-sqube-containing-the-contiguous-sub-string-200.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-200-find-the-200th-prime-proof-sqube-containing-the-contiguous-sub-string-200.english.md
index dfe64c3688..f96d43b7e4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-200-find-the-200th-prime-proof-sqube-containing-the-contiguous-sub-string-200.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-200-find-the-200th-prime-proof-sqube-containing-the-contiguous-sub-string-200.english.md
@@ -27,7 +27,7 @@ Find the 200th prime-proof sqube containing the contiguous sub-string "200".
 ```yml
 tests:
   - text: <code>euler200()</code> should return 229161792008.
-    testString: 'assert.strictEqual(euler200(), 229161792008, "<code>euler200()</code> should return 229161792008.");'
+    testString: assert.strictEqual(euler200(), 229161792008, '<code>euler200()</code> should return 229161792008.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-201-subsets-with-a-unique-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-201-subsets-with-a-unique-sum.english.md
index 038a48f76e..8feafee9fb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-201-subsets-with-a-unique-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-201-subsets-with-a-unique-sum.english.md
@@ -51,7 +51,7 @@ Determine the sum of all integers which are the sum of exactly one of the 50-ele
 ```yml
 tests:
   - text: <code>euler201()</code> should return 115039000.
-    testString: 'assert.strictEqual(euler201(), 115039000, "<code>euler201()</code> should return 115039000.");'
+    testString: assert.strictEqual(euler201(), 115039000, '<code>euler201()</code> should return 115039000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-202-laserbeam.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-202-laserbeam.english.md
index af745f93c4..6311956119 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-202-laserbeam.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-202-laserbeam.english.md
@@ -29,7 +29,7 @@ In how many ways can a laser beam enter at vertex C, bounce off 12017639147 surf
 ```yml
 tests:
   - text: <code>euler202()</code> should return 1209002624.
-    testString: 'assert.strictEqual(euler202(), 1209002624, "<code>euler202()</code> should return 1209002624.");'
+    testString: assert.strictEqual(euler202(), 1209002624, '<code>euler202()</code> should return 1209002624.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-203-squarefree-binomial-coefficients.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-203-squarefree-binomial-coefficients.english.md
index 1782a86ea9..708eed2609 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-203-squarefree-binomial-coefficients.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-203-squarefree-binomial-coefficients.english.md
@@ -33,7 +33,7 @@ Find the sum of the distinct squarefree numbers in the first 51 rows of Pascal's
 ```yml
 tests:
   - text: <code>euler203()</code> should return 34029210557338.
-    testString: 'assert.strictEqual(euler203(), 34029210557338, "<code>euler203()</code> should return 34029210557338.");'
+    testString: assert.strictEqual(euler203(), 34029210557338, '<code>euler203()</code> should return 34029210557338.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-204-generalised-hamming-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-204-generalised-hamming-numbers.english.md
index 6339b12651..37f6d592dd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-204-generalised-hamming-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-204-generalised-hamming-numbers.english.md
@@ -27,7 +27,7 @@ How many generalised Hamming numbers of type 100 are there which don't exceed 10
 ```yml
 tests:
   - text: <code>euler204()</code> should return 2944730.
-    testString: 'assert.strictEqual(euler204(), 2944730, "<code>euler204()</code> should return 2944730.");'
+    testString: assert.strictEqual(euler204(), 2944730, '<code>euler204()</code> should return 2944730.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-205-dice-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-205-dice-game.english.md
index b5b847e655..2eaade3553 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-205-dice-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-205-dice-game.english.md
@@ -25,7 +25,7 @@ What is the probability that Pyramidal Pete beats Cubic Colin? Give your answer
 ```yml
 tests:
   - text: <code>euler205()</code> should return 0.5731441.
-    testString: 'assert.strictEqual(euler205(), 0.5731441, "<code>euler205()</code> should return 0.5731441.");'
+    testString: assert.strictEqual(euler205(), 0.5731441, '<code>euler205()</code> should return 0.5731441.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-206-concealed-square.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-206-concealed-square.english.md
index eddaa08f03..f037a32274 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-206-concealed-square.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-206-concealed-square.english.md
@@ -20,7 +20,7 @@ Find the unique positive integer whose square has the form 1_2_3_4_5_6_7_8_9_0,
 ```yml
 tests:
   - text: <code>euler206()</code> should return 1389019170.
-    testString: 'assert.strictEqual(euler206(), 1389019170, "<code>euler206()</code> should return 1389019170.");'
+    testString: assert.strictEqual(euler206(), 1389019170, '<code>euler206()</code> should return 1389019170.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-207-integer-partition-equations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-207-integer-partition-equations.english.md
index 50ab6e66c2..d0737f1dc1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-207-integer-partition-equations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-207-integer-partition-equations.english.md
@@ -41,7 +41,7 @@ Find the smallest m for which P(m) < 1/12345
 ```yml
 tests:
   - text: <code>euler207()</code> should return 44043947822.
-    testString: 'assert.strictEqual(euler207(), 44043947822, "<code>euler207()</code> should return 44043947822.");'
+    testString: assert.strictEqual(euler207(), 44043947822, '<code>euler207()</code> should return 44043947822.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-208-robot-walks.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-208-robot-walks.english.md
index e8365dc525..1eb5a1dc41 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-208-robot-walks.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-208-robot-walks.english.md
@@ -27,7 +27,7 @@ Given that the robot starts facing North, how many journeys of 70 arcs in length
 ```yml
 tests:
   - text: <code>euler208()</code> should return 331951449665644800.
-    testString: 'assert.strictEqual(euler208(), 331951449665644800, "<code>euler208()</code> should return 331951449665644800.");'
+    testString: assert.strictEqual(euler208(), 331951449665644800, '<code>euler208()</code> should return 331951449665644800.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-209-circular-logic.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-209-circular-logic.english.md
index dedafd8d85..adc8942080 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-209-circular-logic.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-209-circular-logic.english.md
@@ -30,7 +30,7 @@ for all 6-bit inputs (a, b, c, d, e, f)?
 ```yml
 tests:
   - text: <code>euler209()</code> should return 15964587728784.
-    testString: 'assert.strictEqual(euler209(), 15964587728784, "<code>euler209()</code> should return 15964587728784.");'
+    testString: assert.strictEqual(euler209(), 15964587728784, '<code>euler209()</code> should return 15964587728784.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-21-amicable-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-21-amicable-numbers.english.md
index 2fa16e99f0..438d390044 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-21-amicable-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-21-amicable-numbers.english.md
@@ -23,13 +23,13 @@ Evaluate the sum of all the amicable numbers under <var>n</var>.
 ```yml
 tests:
   - text: <code>sumAmicableNum(1000)</code> should return 504.
-    testString: 'assert.strictEqual(sumAmicableNum(1000), 504, "<code>sumAmicableNum(1000)</code> should return 504.");'
+    testString: assert.strictEqual(sumAmicableNum(1000), 504, '<code>sumAmicableNum(1000)</code> should return 504.');
   - text: <code>sumAmicableNum(2000)</code> should return 2898.
-    testString: 'assert.strictEqual(sumAmicableNum(2000), 2898, "<code>sumAmicableNum(2000)</code> should return 2898.");'
+    testString: assert.strictEqual(sumAmicableNum(2000), 2898, '<code>sumAmicableNum(2000)</code> should return 2898.');
   - text: <code>sumAmicableNum(5000)</code> should return 8442.
-    testString: 'assert.strictEqual(sumAmicableNum(5000), 8442, "<code>sumAmicableNum(5000)</code> should return 8442.");'
+    testString: assert.strictEqual(sumAmicableNum(5000), 8442, '<code>sumAmicableNum(5000)</code> should return 8442.');
   - text: <code>sumAmicableNum(10000)</code> should return 31626.
-    testString: 'assert.strictEqual(sumAmicableNum(10000), 31626, "<code>sumAmicableNum(10000)</code> should return 31626.");'
+    testString: assert.strictEqual(sumAmicableNum(10000), 31626, '<code>sumAmicableNum(10000)</code> should return 31626.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-210-obtuse-angled-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-210-obtuse-angled-triangles.english.md
index d09b42ae3e..96d00f40e5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-210-obtuse-angled-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-210-obtuse-angled-triangles.english.md
@@ -25,7 +25,7 @@ What is N(1,000,000,000)?
 ```yml
 tests:
   - text: <code>euler210()</code> should return 1598174770174689500.
-    testString: 'assert.strictEqual(euler210(), 1598174770174689500, "<code>euler210()</code> should return 1598174770174689500.");'
+    testString: assert.strictEqual(euler210(), 1598174770174689500, '<code>euler210()</code> should return 1598174770174689500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-211-divisor-square-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-211-divisor-square-sum.english.md
index 884031ef2e..913f441e34 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-211-divisor-square-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-211-divisor-square-sum.english.md
@@ -22,7 +22,7 @@ Find the sum of all n, 0 < n < 64,000,000 such that σ2(n) is a perfect square.
 ```yml
 tests:
   - text: <code>euler211()</code> should return 1922364685.
-    testString: 'assert.strictEqual(euler211(), 1922364685, "<code>euler211()</code> should return 1922364685.");'
+    testString: assert.strictEqual(euler211(), 1922364685, '<code>euler211()</code> should return 1922364685.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-212-combined-volume-of-cuboids.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-212-combined-volume-of-cuboids.english.md
index 077f83693a..118d7ec7d9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-212-combined-volume-of-cuboids.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-212-combined-volume-of-cuboids.english.md
@@ -34,7 +34,7 @@ What is the combined volume of all 50000 cuboids, C1,...,C50000 ?
 ```yml
 tests:
   - text: <code>euler212()</code> should return 328968937309.
-    testString: 'assert.strictEqual(euler212(), 328968937309, "<code>euler212()</code> should return 328968937309.");'
+    testString: assert.strictEqual(euler212(), 328968937309, '<code>euler212()</code> should return 328968937309.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-213-flea-circus.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-213-flea-circus.english.md
index d38d7ffcd6..4e147a5b71 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-213-flea-circus.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-213-flea-circus.english.md
@@ -23,7 +23,7 @@ What is the expected number of unoccupied squares after 50 rings of the bell? Gi
 ```yml
 tests:
   - text: <code>euler213()</code> should return 330.721154.
-    testString: 'assert.strictEqual(euler213(), 330.721154, "<code>euler213()</code> should return 330.721154.");'
+    testString: assert.strictEqual(euler213(), 330.721154, '<code>euler213()</code> should return 330.721154.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-214-totient-chains.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-214-totient-chains.english.md
index 1fbcbb885f..aece1c2f3a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-214-totient-chains.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-214-totient-chains.english.md
@@ -39,7 +39,7 @@ What is the sum of all primes less than 40000000 which generate a chain of lengt
 ```yml
 tests:
   - text: <code>euler214()</code> should return 1677366278943.
-    testString: 'assert.strictEqual(euler214(), 1677366278943, "<code>euler214()</code> should return 1677366278943.");'
+    testString: assert.strictEqual(euler214(), 1677366278943, '<code>euler214()</code> should return 1677366278943.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-215-crack-free-walls.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-215-crack-free-walls.english.md
index daeb1fd612..a2a9c7ffac 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-215-crack-free-walls.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-215-crack-free-walls.english.md
@@ -29,7 +29,7 @@ Calculate W(32,10).
 ```yml
 tests:
   - text: <code>euler215()</code> should return 806844323190414.
-    testString: 'assert.strictEqual(euler215(), 806844323190414, "<code>euler215()</code> should return 806844323190414.");'
+    testString: assert.strictEqual(euler215(), 806844323190414, '<code>euler215()</code> should return 806844323190414.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-216-investigating-the-primality-of-numbers-of-the-form-2n2-1.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-216-investigating-the-primality-of-numbers-of-the-form-2n2-1.english.md
index fe99933c6b..caaef1b12b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-216-investigating-the-primality-of-numbers-of-the-form-2n2-1.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-216-investigating-the-primality-of-numbers-of-the-form-2n2-1.english.md
@@ -25,7 +25,7 @@ How many numbers t(n) are prime for n ≤ 50,000,000 ?
 ```yml
 tests:
   - text: <code>euler216()</code> should return 5437849.
-    testString: 'assert.strictEqual(euler216(), 5437849, "<code>euler216()</code> should return 5437849.");'
+    testString: assert.strictEqual(euler216(), 5437849, '<code>euler216()</code> should return 5437849.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-217-balanced-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-217-balanced-numbers.english.md
index 27e8ba8ddb..0eaf91d8e0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-217-balanced-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-217-balanced-numbers.english.md
@@ -24,7 +24,7 @@ Find T(47) mod 315
 ```yml
 tests:
   - text: <code>euler217()</code> should return 6273134.
-    testString: 'assert.strictEqual(euler217(), 6273134, "<code>euler217()</code> should return 6273134.");'
+    testString: assert.strictEqual(euler217(), 6273134, '<code>euler217()</code> should return 6273134.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-218-perfect-right-angled-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-218-perfect-right-angled-triangles.english.md
index 5ac8d4f1c0..4432cb0fcd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-218-perfect-right-angled-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-218-perfect-right-angled-triangles.english.md
@@ -34,7 +34,7 @@ How many perfect right-angled triangles with c≤1016 exist that are not super-p
 ```yml
 tests:
   - text: <code>euler218()</code> should return 0.
-    testString: 'assert.strictEqual(euler218(), 0, "<code>euler218()</code> should return 0.");'
+    testString: assert.strictEqual(euler218(), 0, '<code>euler218()</code> should return 0.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-219-skew-cost-coding.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-219-skew-cost-coding.english.md
index 96f19469e7..15487b5a86 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-219-skew-cost-coding.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-219-skew-cost-coding.english.md
@@ -32,7 +32,7 @@ What is Cost(109) ?
 ```yml
 tests:
   - text: <code>euler219()</code> should return 64564225042.
-    testString: 'assert.strictEqual(euler219(), 64564225042, "<code>euler219()</code> should return 64564225042.");'
+    testString: assert.strictEqual(euler219(), 64564225042, '<code>euler219()</code> should return 64564225042.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-22-names-scores.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-22-names-scores.english.md
index 7aec66ea9e..e2d90578c4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-22-names-scores.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-22-names-scores.english.md
@@ -22,11 +22,11 @@ What is the total of all the name scores in the file?
 ```yml
 tests:
   - text: <code>namesScores(test1)</code> should return 791.
-    testString: 'assert.strictEqual(namesScores(test1), 791, "<code>namesScores(test1)</code> should return 791.");'
+    testString: assert.strictEqual(namesScores(test1), 791, '<code>namesScores(test1)</code> should return 791.');
   - text: <code>namesScores(test2)</code> should return 1468.
-    testString: 'assert.strictEqual(namesScores(test2), 1468, "<code>namesScores(test2)</code> should return 1468.");'
+    testString: assert.strictEqual(namesScores(test2), 1468, '<code>namesScores(test2)</code> should return 1468.');
   - text: <code>namesScores(names)</code> should return 871198282.
-    testString: 'assert.strictEqual(namesScores(names), 871198282, "<code>namesScores(names)</code> should return 871198282.");'
+    testString: assert.strictEqual(namesScores(names), 871198282, '<code>namesScores(names)</code> should return 871198282.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-220-heighway-dragon.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-220-heighway-dragon.english.md
index a7f0853ebe..74a21f8505 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-220-heighway-dragon.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-220-heighway-dragon.english.md
@@ -34,8 +34,8 @@ Give your answer in the form x,y with no spaces.
 
 ```yml
 tests:
-  - text: '<code>euler220()</code> should return 139776, 963904.'
-    testString: 'assert.strictEqual(euler220(), 139776, 963904, "<code>euler220()</code> should return 139776, 963904.");'
+  - text: <code>euler220()</code> should return 139776, 963904.
+    testString: assert.strictEqual(euler220(), 139776, 963904, '<code>euler220()</code> should return 139776, 963904.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-221-alexandrian-integers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-221-alexandrian-integers.english.md
index 2a4926fc7b..82a8791155 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-221-alexandrian-integers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-221-alexandrian-integers.english.md
@@ -39,7 +39,7 @@ Find the 150000th Alexandrian integer.
 ```yml
 tests:
   - text: <code>euler221()</code> should return 1884161251122450.
-    testString: 'assert.strictEqual(euler221(), 1884161251122450, "<code>euler221()</code> should return 1884161251122450.");'
+    testString: assert.strictEqual(euler221(), 1884161251122450, '<code>euler221()</code> should return 1884161251122450.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-222-sphere-packing.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-222-sphere-packing.english.md
index f5fdf1b4b7..eef1d821cb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-222-sphere-packing.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-222-sphere-packing.english.md
@@ -22,7 +22,7 @@ Give your answer in micrometres (10-6 m) rounded to the nearest integer.
 ```yml
 tests:
   - text: <code>euler222()</code> should return 1590933.
-    testString: 'assert.strictEqual(euler222(), 1590933, "<code>euler222()</code> should return 1590933.");'
+    testString: assert.strictEqual(euler222(), 1590933, '<code>euler222()</code> should return 1590933.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-223-almost-right-angled-triangles-i.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-223-almost-right-angled-triangles-i.english.md
index 0b71d4fb5c..54abd8fbce 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-223-almost-right-angled-triangles-i.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-223-almost-right-angled-triangles-i.english.md
@@ -22,7 +22,7 @@ How many barely acute triangles are there with perimeter ≤ 25,000,000?
 ```yml
 tests:
   - text: <code>euler223()</code> should return 61614848.
-    testString: 'assert.strictEqual(euler223(), 61614848, "<code>euler223()</code> should return 61614848.");'
+    testString: assert.strictEqual(euler223(), 61614848, '<code>euler223()</code> should return 61614848.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-224-almost-right-angled-triangles-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-224-almost-right-angled-triangles-ii.english.md
index 9de9687fdb..7982497337 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-224-almost-right-angled-triangles-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-224-almost-right-angled-triangles-ii.english.md
@@ -22,7 +22,7 @@ How many barely obtuse triangles are there with perimeter ≤ 75,000,000?
 ```yml
 tests:
   - text: <code>euler224()</code> should return 4137330.
-    testString: 'assert.strictEqual(euler224(), 4137330, "<code>euler224()</code> should return 4137330.");'
+    testString: assert.strictEqual(euler224(), 4137330, '<code>euler224()</code> should return 4137330.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-225-tribonacci-non-divisors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-225-tribonacci-non-divisors.english.md
index f0c1f73527..b2aa4f4a52 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-225-tribonacci-non-divisors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-225-tribonacci-non-divisors.english.md
@@ -26,7 +26,7 @@ Find the 124th odd number that does not divide any terms of the above sequence.
 ```yml
 tests:
   - text: <code>euler225()</code> should return 2009.
-    testString: 'assert.strictEqual(euler225(), 2009, "<code>euler225()</code> should return 2009.");'
+    testString: assert.strictEqual(euler225(), 2009, '<code>euler225()</code> should return 2009.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-226-a-scoop-of-blancmange.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-226-a-scoop-of-blancmange.english.md
index 273b4ccf61..be1316325a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-226-a-scoop-of-blancmange.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-226-a-scoop-of-blancmange.english.md
@@ -29,7 +29,7 @@ What area under the blancmange curve is enclosed by C?Give your answer rounded t
 ```yml
 tests:
   - text: <code>euler226()</code> should return 0.11316017.
-    testString: 'assert.strictEqual(euler226(), 0.11316017, "<code>euler226()</code> should return 0.11316017.");'
+    testString: assert.strictEqual(euler226(), 0.11316017, '<code>euler226()</code> should return 0.11316017.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-227-the-chase.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-227-the-chase.english.md
index 5aacf6a8c7..44192facae 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-227-the-chase.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-227-the-chase.english.md
@@ -27,7 +27,7 @@ Give your answer rounded to ten significant digits.
 ```yml
 tests:
   - text: <code>euler227()</code> should return 3780.618622.
-    testString: 'assert.strictEqual(euler227(), 3780.618622, "<code>euler227()</code> should return 3780.618622.");'
+    testString: assert.strictEqual(euler227(), 3780.618622, '<code>euler227()</code> should return 3780.618622.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-228-minkowski-sums.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-228-minkowski-sums.english.md
index 10b3a2c982..cd5f060551 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-228-minkowski-sums.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-228-minkowski-sums.english.md
@@ -42,7 +42,7 @@ How many sides does S1864 + S1865 + … + S1909 have?
 ```yml
 tests:
   - text: <code>euler228()</code> should return 86226.
-    testString: 'assert.strictEqual(euler228(), 86226, "<code>euler228()</code> should return 86226.");'
+    testString: assert.strictEqual(euler228(), 86226, '<code>euler228()</code> should return 86226.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-229-four-representations-using-squares.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-229-four-representations-using-squares.english.md
index 9806a06976..f23ca5860d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-229-four-representations-using-squares.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-229-four-representations-using-squares.english.md
@@ -38,7 +38,7 @@ How many such numbers are there that do not exceed 2×109?
 ```yml
 tests:
   - text: <code>euler229()</code> should return 11325263.
-    testString: 'assert.strictEqual(euler229(), 11325263, "<code>euler229()</code> should return 11325263.");'
+    testString: assert.strictEqual(euler229(), 11325263, '<code>euler229()</code> should return 11325263.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-23-non-abundant-sums.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-23-non-abundant-sums.english.md
index 48c33c68ff..4858ce97b2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-23-non-abundant-sums.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-23-non-abundant-sums.english.md
@@ -23,13 +23,13 @@ Find the sum of all positive integers <= <var>n</var> which cannot be written as
 ```yml
 tests:
   - text: <code>sumOfNonAbundantNumbers(10000)</code> should return 3731004.
-    testString: 'assert(sumOfNonAbundantNumbers(10000) === 3731004, "<code>sumOfNonAbundantNumbers(10000)</code> should return 3731004.");'
+    testString: assert(sumOfNonAbundantNumbers(10000) === 3731004, '<code>sumOfNonAbundantNumbers(10000)</code> should return 3731004.');
   - text: <code>sumOfNonAbundantNumbers(15000)</code> should return 4039939.
-    testString: 'assert(sumOfNonAbundantNumbers(15000) === 4039939, "<code>sumOfNonAbundantNumbers(15000)</code> should return 4039939.");'
+    testString: assert(sumOfNonAbundantNumbers(15000) === 4039939, '<code>sumOfNonAbundantNumbers(15000)</code> should return 4039939.');
   - text: <code>sumOfNonAbundantNumbers(20000)</code> should return 4159710.
-    testString: 'assert(sumOfNonAbundantNumbers(20000) === 4159710, "<code>sumOfNonAbundantNumbers(20000)</code> should return 4159710.");'
+    testString: assert(sumOfNonAbundantNumbers(20000) === 4159710, '<code>sumOfNonAbundantNumbers(20000)</code> should return 4159710.');
   - text: <code>sumOfNonAbundantNumbers(28123)</code> should return 4179871.
-    testString: 'assert(sumOfNonAbundantNumbers(28123) === 4179871, "<code>sumOfNonAbundantNumbers(28123)</code> should return 4179871.");'
+    testString: assert(sumOfNonAbundantNumbers(28123) === 4179871, '<code>sumOfNonAbundantNumbers(28123)</code> should return 4179871.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-230-fibonacci-words.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-230-fibonacci-words.english.md
index 8da8662d47..d2b0689f86 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-230-fibonacci-words.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-230-fibonacci-words.english.md
@@ -46,7 +46,7 @@ Find ∑n = 0,1,...,17   10n× DA,B((127+19n)×7n) .
 ```yml
 tests:
   - text: <code>euler230()</code> should return 850481152593119200.
-    testString: 'assert.strictEqual(euler230(), 850481152593119200, "<code>euler230()</code> should return 850481152593119200.");'
+    testString: assert.strictEqual(euler230(), 850481152593119200, '<code>euler230()</code> should return 850481152593119200.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-231-the-prime-factorisation-of-binomial-coefficients.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-231-the-prime-factorisation-of-binomial-coefficients.english.md
index b7381e3075..e22afa9616 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-231-the-prime-factorisation-of-binomial-coefficients.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-231-the-prime-factorisation-of-binomial-coefficients.english.md
@@ -24,7 +24,7 @@ Find the sum of the terms in the prime factorisation of 20000000C15000000.
 ```yml
 tests:
   - text: <code>euler231()</code> should return 7526965179680.
-    testString: 'assert.strictEqual(euler231(), 7526965179680, "<code>euler231()</code> should return 7526965179680.");'
+    testString: assert.strictEqual(euler231(), 7526965179680, '<code>euler231()</code> should return 7526965179680.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-232-the-race.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-232-the-race.english.md
index 2e967083f7..2b021417b2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-232-the-race.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-232-the-race.english.md
@@ -26,7 +26,7 @@ Give your answer rounded to eight decimal places in the form 0.abcdefgh .
 ```yml
 tests:
   - text: <code>euler232()</code> should return 0.83648556.
-    testString: 'assert.strictEqual(euler232(), 0.83648556, "<code>euler232()</code> should return 0.83648556.");'
+    testString: assert.strictEqual(euler232(), 0.83648556, '<code>euler232()</code> should return 0.83648556.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-233-lattice-points-on-a-circle.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-233-lattice-points-on-a-circle.english.md
index 92cf46bf9d..b0c661cdd2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-233-lattice-points-on-a-circle.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-233-lattice-points-on-a-circle.english.md
@@ -23,7 +23,7 @@ What is the sum of all positive integers N ≤ 1011 such that f(N) = 420
 ```yml
 tests:
   - text: <code>euler233()</code> should return 271204031455541300.
-    testString: 'assert.strictEqual(euler233(), 271204031455541300, "<code>euler233()</code> should return 271204031455541300.");'
+    testString: assert.strictEqual(euler233(), 271204031455541300, '<code>euler233()</code> should return 271204031455541300.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-234-semidivisible-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-234-semidivisible-numbers.english.md
index 457dbc9599..49e8601442 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-234-semidivisible-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-234-semidivisible-numbers.english.md
@@ -27,7 +27,7 @@ What is the sum of all semidivisible numbers not exceeding 999966663333 ?
 ```yml
 tests:
   - text: <code>euler234()</code> should return 1259187438574927000.
-    testString: 'assert.strictEqual(euler234(), 1259187438574927000, "<code>euler234()</code> should return 1259187438574927000.");'
+    testString: assert.strictEqual(euler234(), 1259187438574927000, '<code>euler234()</code> should return 1259187438574927000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-235-an-arithmetic-geometric-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-235-an-arithmetic-geometric-sequence.english.md
index 3e898d6c3f..7fbe696f17 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-235-an-arithmetic-geometric-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-235-an-arithmetic-geometric-sequence.english.md
@@ -27,7 +27,7 @@ Give your answer rounded to 12 places behind the decimal point.
 ```yml
 tests:
   - text: <code>euler235()</code> should return 1.002322108633.
-    testString: 'assert.strictEqual(euler235(), 1.002322108633, "<code>euler235()</code> should return 1.002322108633.");'
+    testString: assert.strictEqual(euler235(), 1.002322108633, '<code>euler235()</code> should return 1.002322108633.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-236-luxury-hampers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-236-luxury-hampers.english.md
index 50f0d10558..9d6ecd7337 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-236-luxury-hampers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-236-luxury-hampers.english.md
@@ -8,7 +8,7 @@ title: 'Problem 236: Luxury Hampers'
 <section id='description'>
 Suppliers 'A' and 'B' provided the following numbers of products for the luxury hamper market:
 
-Product'A"B'Beluga Caviar5248640Christmas Cake13121888Gammon Joint26243776Vintage Port57603776Champagne Truffles39365664
+Product'A''B'Beluga Caviar5248640Christmas Cake13121888Gammon Joint26243776Vintage Port57603776Champagne Truffles39365664
 
 Although the suppliers try very hard to ship their goods in perfect condition, there is inevitably some spoilage - i.e. products gone bad.
 
@@ -32,7 +32,7 @@ Give your answer as a fraction reduced to its lowest terms, in the form u/v.
 ```yml
 tests:
   - text: <code>euler236()</code> should return 123 / 59.
-    testString: 'assert.strictEqual(euler236(), 123 / 59, "<code>euler236()</code> should return 123 / 59.");'
+    testString: assert.strictEqual(euler236(), 123 / 59, '<code>euler236()</code> should return 123 / 59.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-237-tours-on-a-4-x-n-playing-board.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-237-tours-on-a-4-x-n-playing-board.english.md
index 6d6466ec73..308453846e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-237-tours-on-a-4-x-n-playing-board.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-237-tours-on-a-4-x-n-playing-board.english.md
@@ -30,7 +30,7 @@ T(10) is 2329. What is T(1012) modulo 108?
 ```yml
 tests:
   - text: <code>euler237()</code> should return 15836928.
-    testString: 'assert.strictEqual(euler237(), 15836928, "<code>euler237()</code> should return 15836928.");'
+    testString: assert.strictEqual(euler237(), 15836928, '<code>euler237()</code> should return 15836928.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-238-infinite-string-tour.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-238-infinite-string-tour.english.md
index 52bb5d2d10..c1574d8908 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-238-infinite-string-tour.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-238-infinite-string-tour.english.md
@@ -53,7 +53,7 @@ Find ∑ p(k), for 0 < k ≤ 2·1015.
 ```yml
 tests:
   - text: <code>euler238()</code> should return 9922545104535660.
-    testString: 'assert.strictEqual(euler238(), 9922545104535660, "<code>euler238()</code> should return 9922545104535660.");'
+    testString: assert.strictEqual(euler238(), 9922545104535660, '<code>euler238()</code> should return 9922545104535660.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-239-twenty-two-foolish-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-239-twenty-two-foolish-primes.english.md
index 574d9933ec..e73151282f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-239-twenty-two-foolish-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-239-twenty-two-foolish-primes.english.md
@@ -25,7 +25,7 @@ Give your answer rounded to 12 places behind the decimal point in the form 0.abc
 ```yml
 tests:
   - text: <code>euler239()</code> should return 0.001887854841.
-    testString: 'assert.strictEqual(euler239(), 0.001887854841, "<code>euler239()</code> should return 0.001887854841.");'
+    testString: assert.strictEqual(euler239(), 0.001887854841, '<code>euler239()</code> should return 0.001887854841.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-24-lexicographic-permutations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-24-lexicographic-permutations.english.md
index abc9089287..07760d05e8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-24-lexicographic-permutations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-24-lexicographic-permutations.english.md
@@ -22,13 +22,13 @@ What is the <var>n</var>th lexicographic permutation of the digits 0, 1, 2, 3, 4
 ```yml
 tests:
   - text: <code>lexicographicPermutations(699999)</code> should return 1938246570.
-    testString: 'assert(lexicographicPermutations(699999) == 1938246570, "<code>lexicographicPermutations(699999)</code> should return 1938246570.");'
+    testString: assert(lexicographicPermutations(699999) == 1938246570, '<code>lexicographicPermutations(699999)</code> should return 1938246570.');
   - text: <code>lexicographicPermutations(899999)</code> should return 2536987410.
-    testString: 'assert(lexicographicPermutations(899999) == 2536987410, "<code>lexicographicPermutations(899999)</code> should return 2536987410.");'
+    testString: assert(lexicographicPermutations(899999) == 2536987410, '<code>lexicographicPermutations(899999)</code> should return 2536987410.');
   - text: <code>lexicographicPermutations(900000)</code> should return 2537014689.
-    testString: 'assert(lexicographicPermutations(900000) == 2537014689, "<code>lexicographicPermutations(900000)</code> should return 2537014689.");'
+    testString: assert(lexicographicPermutations(900000) == 2537014689, '<code>lexicographicPermutations(900000)</code> should return 2537014689.');
   - text: <code>lexicographicPermutations(999999)</code> should return 2783915460.
-    testString: 'assert(lexicographicPermutations(999999) == 2783915460, "<code>lexicographicPermutations(999999)</code> should return 2783915460.");'
+    testString: assert(lexicographicPermutations(999999) == 2783915460, '<code>lexicographicPermutations(999999)</code> should return 2783915460.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-240-top-dice.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-240-top-dice.english.md
index 069f8c5747..713d9d6638 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-240-top-dice.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-240-top-dice.english.md
@@ -31,7 +31,7 @@ In how many ways can twenty 12-sided dice (sides numbered 1 to 12) be rolled so
 ```yml
 tests:
   - text: <code>euler240()</code> should return 7448717393364182000.
-    testString: 'assert.strictEqual(euler240(), 7448717393364182000, "<code>euler240()</code> should return 7448717393364182000.");'
+    testString: assert.strictEqual(euler240(), 7448717393364182000, '<code>euler240()</code> should return 7448717393364182000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-241-perfection-quotients.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-241-perfection-quotients.english.md
index 7cb5336f96..3d6c08adc2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-241-perfection-quotients.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-241-perfection-quotients.english.md
@@ -28,7 +28,7 @@ Find the sum of all positive integers n ≤ 1018 for which p(n) has the form k +
 ```yml
 tests:
   - text: <code>euler241()</code> should return 482316491800641150.
-    testString: 'assert.strictEqual(euler241(), 482316491800641150, "<code>euler241()</code> should return 482316491800641150.");'
+    testString: assert.strictEqual(euler241(), 482316491800641150, '<code>euler241()</code> should return 482316491800641150.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-242-odd-triplets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-242-odd-triplets.english.md
index 62f3a2730e..db16b9dc39 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-242-odd-triplets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-242-odd-triplets.english.md
@@ -28,7 +28,7 @@ How many odd-triplets are there with n ≤ 1012 ?
 ```yml
 tests:
   - text: <code>euler242()</code> should return 997104142249036700.
-    testString: 'assert.strictEqual(euler242(), 997104142249036700, "<code>euler242()</code> should return 997104142249036700.");'
+    testString: assert.strictEqual(euler242(), 997104142249036700, '<code>euler242()</code> should return 997104142249036700.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-243-resilience.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-243-resilience.english.md
index c76866e449..66490dd54e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-243-resilience.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-243-resilience.english.md
@@ -28,7 +28,7 @@ Find the smallest denominator d, having a resilience R(d) < 15499/94744 .
 ```yml
 tests:
   - text: <code>euler243()</code> should return 892371480.
-    testString: 'assert.strictEqual(euler243(), 892371480, "<code>euler243()</code> should return 892371480.");'
+    testString: assert.strictEqual(euler243(), 892371480, '<code>euler243()</code> should return 892371480.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-244-sliders.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-244-sliders.english.md
index 9a5d68986a..c7a6f3ba2b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-244-sliders.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-244-sliders.english.md
@@ -45,7 +45,7 @@ What is the sum of all checksums for the paths having the minimal length?
 ```yml
 tests:
   - text: <code>euler244()</code> should return 96356848.
-    testString: 'assert.strictEqual(euler244(), 96356848, "<code>euler244()</code> should return 96356848.");'
+    testString: assert.strictEqual(euler244(), 96356848, '<code>euler244()</code> should return 96356848.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-245-coresilience.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-245-coresilience.english.md
index ea44a8256e..128ee4992c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-245-coresilience.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-245-coresilience.english.md
@@ -30,7 +30,7 @@ Find the sum of all composite integers 1 < n ≤ 2×1011, for which C(n) is a un
 ```yml
 tests:
   - text: <code>euler245()</code> should return 288084712410001.
-    testString: 'assert.strictEqual(euler245(), 288084712410001, "<code>euler245()</code> should return 288084712410001.");'
+    testString: assert.strictEqual(euler245(), 288084712410001, '<code>euler245()</code> should return 288084712410001.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-246-tangents-to-an-ellipse.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-246-tangents-to-an-ellipse.english.md
index 5eef0f6d57..fa4f585a24 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-246-tangents-to-an-ellipse.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-246-tangents-to-an-ellipse.english.md
@@ -38,7 +38,7 @@ For how many lattice points P is angle RPS greater than 45 degrees?
 ```yml
 tests:
   - text: <code>euler246()</code> should return 810834388.
-    testString: 'assert.strictEqual(euler246(), 810834388, "<code>euler246()</code> should return 810834388.");'
+    testString: assert.strictEqual(euler246(), 810834388, '<code>euler246()</code> should return 810834388.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-247-squares-under-a-hyperbola.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-247-squares-under-a-hyperbola.english.md
index 381a08b493..ed15ad6209 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-247-squares-under-a-hyperbola.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-247-squares-under-a-hyperbola.english.md
@@ -35,7 +35,7 @@ What is the largest n for which the index of Sn is (3,3)?
 ```yml
 tests:
   - text: <code>euler247()</code> should return 782252.
-    testString: 'assert.strictEqual(euler247(), 782252, "<code>euler247()</code> should return 782252.");'
+    testString: assert.strictEqual(euler247(), 782252, '<code>euler247()</code> should return 782252.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-248-numbers-for-which-eulers-totient-function-equals-13.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-248-numbers-for-which-eulers-totient-function-equals-13.english.md
index ce1a31843a..59832a8f38 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-248-numbers-for-which-eulers-totient-function-equals-13.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-248-numbers-for-which-eulers-totient-function-equals-13.english.md
@@ -21,7 +21,7 @@ Find the 150,000th such number.
 ```yml
 tests:
   - text: <code>euler248()</code> should return 23507044290.
-    testString: 'assert.strictEqual(euler248(), 23507044290, "<code>euler248()</code> should return 23507044290.");'
+    testString: assert.strictEqual(euler248(), 23507044290, '<code>euler248()</code> should return 23507044290.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-249-prime-subset-sums.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-249-prime-subset-sums.english.md
index 2e820799c8..7158497d93 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-249-prime-subset-sums.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-249-prime-subset-sums.english.md
@@ -22,7 +22,7 @@ Enter the rightmost 16 digits as your answer.
 ```yml
 tests:
   - text: <code>euler249()</code> should return 9275262564250418.
-    testString: 'assert.strictEqual(euler249(), 9275262564250418, "<code>euler249()</code> should return 9275262564250418.");'
+    testString: assert.strictEqual(euler249(), 9275262564250418, '<code>euler249()</code> should return 9275262564250418.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-25-1000-digit-fibonacci-number.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-25-1000-digit-fibonacci-number.english.md
index 434957ef5b..121f322b76 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-25-1000-digit-fibonacci-number.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-25-1000-digit-fibonacci-number.english.md
@@ -25,13 +25,13 @@ What is the index of the first term in the Fibonacci sequence to contain <var>n<
 ```yml
 tests:
   - text: <code>digitFibonacci(5)</code> should return 21.
-    testString: 'assert.strictEqual(digitFibonacci(5), 21, "<code>digitFibonacci(5)</code> should return 21.");'
+    testString: assert.strictEqual(digitFibonacci(5), 21, '<code>digitFibonacci(5)</code> should return 21.');
   - text: <code>digitFibonacci(10)</code> should return 45.
-    testString: 'assert.strictEqual(digitFibonacci(10), 45, "<code>digitFibonacci(10)</code> should return 45.");'
+    testString: assert.strictEqual(digitFibonacci(10), 45, '<code>digitFibonacci(10)</code> should return 45.');
   - text: <code>digitFibonacci(15)</code> should return 69.
-    testString: 'assert.strictEqual(digitFibonacci(15), 69, "<code>digitFibonacci(15)</code> should return 69.");'
+    testString: assert.strictEqual(digitFibonacci(15), 69, '<code>digitFibonacci(15)</code> should return 69.');
   - text: <code>digitFibonacci(20)</code> should return 93.
-    testString: 'assert.strictEqual(digitFibonacci(20), 93, "<code>digitFibonacci(20)</code> should return 93.");'
+    testString: assert.strictEqual(digitFibonacci(20), 93, '<code>digitFibonacci(20)</code> should return 93.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-250-250250.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-250-250250.english.md
index dd9bbf8a0b..3fbd46413d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-250-250250.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-250-250250.english.md
@@ -20,7 +20,7 @@ Find the number of non-empty subsets of {11, 22, 33,..., 250250250250}, the sum
 ```yml
 tests:
   - text: <code>euler250()</code> should return 1425480602091519.
-    testString: 'assert.strictEqual(euler250(), 1425480602091519, "<code>euler250()</code> should return 1425480602091519.");'
+    testString: assert.strictEqual(euler250(), 1425480602091519, '<code>euler250()</code> should return 1425480602091519.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-251-cardano-triplets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-251-cardano-triplets.english.md
index 775969b002..9cab786c0a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-251-cardano-triplets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-251-cardano-triplets.english.md
@@ -30,7 +30,7 @@ Find how many Cardano Triplets exist such that a+b+c ≤ 110,000,000.
 ```yml
 tests:
   - text: <code>euler251()</code> should return 18946051.
-    testString: 'assert.strictEqual(euler251(), 18946051, "<code>euler251()</code> should return 18946051.");'
+    testString: assert.strictEqual(euler251(), 18946051, '<code>euler251()</code> should return 18946051.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-252-convex-holes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-252-convex-holes.english.md
index 4cf7b52556..511d151d15 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-252-convex-holes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-252-convex-holes.english.md
@@ -46,7 +46,7 @@ What is the maximum area for a convex hole on the set containing the first 500 p
 ```yml
 tests:
   - text: <code>euler252()</code> should return 104924.
-    testString: 'assert.strictEqual(euler252(), 104924, "<code>euler252()</code> should return 104924.");'
+    testString: assert.strictEqual(euler252(), 104924, '<code>euler252()</code> should return 104924.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-253-tidying-up.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-253-tidying-up.english.md
index 209a20e052..20acb6c02d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-253-tidying-up.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-253-tidying-up.english.md
@@ -38,7 +38,7 @@ Give your answer rounded to six decimal places.
 ```yml
 tests:
   - text: <code>euler253()</code> should return 11.492847.
-    testString: 'assert.strictEqual(euler253(), 11.492847, "<code>euler253()</code> should return 11.492847.");'
+    testString: assert.strictEqual(euler253(), 11.492847, '<code>euler253()</code> should return 11.492847.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-254-sums-of-digit-factorials.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-254-sums-of-digit-factorials.english.md
index 00240df112..9902dbe9cd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-254-sums-of-digit-factorials.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-254-sums-of-digit-factorials.english.md
@@ -30,7 +30,7 @@ What is ∑ sg(i) for 1 ≤ i ≤ 150?
 ```yml
 tests:
   - text: <code>euler254()</code> should return 8184523820510.
-    testString: 'assert.strictEqual(euler254(), 8184523820510, "<code>euler254()</code> should return 8184523820510.");'
+    testString: assert.strictEqual(euler254(), 8184523820510, '<code>euler254()</code> should return 8184523820510.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-255-rounded-square-roots.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-255-rounded-square-roots.english.md
index bde4714f76..054c131372 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-255-rounded-square-roots.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-255-rounded-square-roots.english.md
@@ -43,7 +43,7 @@ Note: The symbols ⌊x⌋ and ⌈x⌉ represent the floor function and ceiling f
 ```yml
 tests:
   - text: <code>euler255()</code> should return 4.447401118.
-    testString: 'assert.strictEqual(euler255(), 4.447401118, "<code>euler255()</code> should return 4.447401118.");'
+    testString: assert.strictEqual(euler255(), 4.447401118, '<code>euler255()</code> should return 4.447401118.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-256-tatami-free-rooms.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-256-tatami-free-rooms.english.md
index d932f900ba..0e64298c1d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-256-tatami-free-rooms.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-256-tatami-free-rooms.english.md
@@ -45,7 +45,7 @@ Find the smallest room-size s for which T(s) = 200.
 ```yml
 tests:
   - text: <code>euler256()</code> should return 85765680.
-    testString: 'assert.strictEqual(euler256(), 85765680, "<code>euler256()</code> should return 85765680.");'
+    testString: assert.strictEqual(euler256(), 85765680, '<code>euler256()</code> should return 85765680.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-257-angular-bisectors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-257-angular-bisectors.english.md
index 67d875c440..67617efa97 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-257-angular-bisectors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-257-angular-bisectors.english.md
@@ -32,7 +32,7 @@ How many triangles ABC with perimeter≤100,000,000 exist so that the ratio area
 ```yml
 tests:
   - text: <code>euler257()</code> should return 139012411.
-    testString: 'assert.strictEqual(euler257(), 139012411, "<code>euler257()</code> should return 139012411.");'
+    testString: assert.strictEqual(euler257(), 139012411, '<code>euler257()</code> should return 139012411.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-258-a-lagged-fibonacci-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-258-a-lagged-fibonacci-sequence.english.md
index 6cf7d8257b..6df20b5853 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-258-a-lagged-fibonacci-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-258-a-lagged-fibonacci-sequence.english.md
@@ -24,7 +24,7 @@ Find gk mod 20092010 for k = 1018.
 ```yml
 tests:
   - text: <code>euler258()</code> should return 12747994.
-    testString: 'assert.strictEqual(euler258(), 12747994, "<code>euler258()</code> should return 12747994.");'
+    testString: assert.strictEqual(euler258(), 12747994, '<code>euler258()</code> should return 12747994.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-259-reachable-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-259-reachable-numbers.english.md
index 9e2c585906..48dd83bca7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-259-reachable-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-259-reachable-numbers.english.md
@@ -30,7 +30,7 @@ What is the sum of all positive reachable integers?
 ```yml
 tests:
   - text: <code>euler259()</code> should return 20101196798.
-    testString: 'assert.strictEqual(euler259(), 20101196798, "<code>euler259()</code> should return 20101196798.");'
+    testString: assert.strictEqual(euler259(), 20101196798, '<code>euler259()</code> should return 20101196798.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-26-reciprocal-cycles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-26-reciprocal-cycles.english.md
index 37c1d4e745..630743a547 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-26-reciprocal-cycles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-26-reciprocal-cycles.english.md
@@ -23,13 +23,13 @@ Find the value of <var>d</var> < <var>n</var> for which <sup>1</sup>/<sub>d</sub
 ```yml
 tests:
   - text: <code>reciprocalCycles(700)</code> should return 659.
-    testString: 'assert(reciprocalCycles(700) == 659, "<code>reciprocalCycles(700)</code> should return 659.");'
+    testString: assert(reciprocalCycles(700) == 659, '<code>reciprocalCycles(700)</code> should return 659.');
   - text: <code>reciprocalCycles(800)</code> should return 743.
-    testString: 'assert(reciprocalCycles(800) == 743, "<code>reciprocalCycles(800)</code> should return 743.");'
+    testString: assert(reciprocalCycles(800) == 743, '<code>reciprocalCycles(800)</code> should return 743.');
   - text: <code>reciprocalCycles(900)</code> should return 887.
-    testString: 'assert(reciprocalCycles(900) == 887, "<code>reciprocalCycles(900)</code> should return 887.");'
+    testString: assert(reciprocalCycles(900) == 887, '<code>reciprocalCycles(900)</code> should return 887.');
   - text: <code>reciprocalCycles(1000)</code> should return 983.
-    testString: 'assert(reciprocalCycles(1000) == 983, "<code>reciprocalCycles(1000)</code> should return 983.");'
+    testString: assert(reciprocalCycles(1000) == 983, '<code>reciprocalCycles(1000)</code> should return 983.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-260-stone-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-260-stone-game.english.md
index 94d952d459..3b41617c89 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-260-stone-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-260-stone-game.english.md
@@ -39,7 +39,7 @@ with xi ≤ yi ≤ zi ≤ 1000.
 ```yml
 tests:
   - text: <code>euler260()</code> should return 167542057.
-    testString: 'assert.strictEqual(euler260(), 167542057, "<code>euler260()</code> should return 167542057.");'
+    testString: assert.strictEqual(euler260(), 167542057, '<code>euler260()</code> should return 167542057.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-261-pivotal-square-sums.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-261-pivotal-square-sums.english.md
index f7be03a1ea..0c9dcf3215 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-261-pivotal-square-sums.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-261-pivotal-square-sums.english.md
@@ -29,7 +29,7 @@ Some small square-pivots are
 ```yml
 tests:
   - text: <code>euler261()</code> should return 238890850232021.
-    testString: 'assert.strictEqual(euler261(), 238890850232021, "<code>euler261()</code> should return 238890850232021.");'
+    testString: assert.strictEqual(euler261(), 238890850232021, '<code>euler261()</code> should return 238890850232021.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-262-mountain-range.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-262-mountain-range.english.md
index aa92716c09..37fbd7e699 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-262-mountain-range.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-262-mountain-range.english.md
@@ -35,7 +35,7 @@ h=( 5000-0.005*(x*x+y*y+x*y)+12.5*(x+y) ) * exp( -abs(0.000001*(x*x+y*y)-0.0015*
 ```yml
 tests:
   - text: <code>euler262()</code> should return 2531.205.
-    testString: 'assert.strictEqual(euler262(), 2531.205, "<code>euler262()</code> should return 2531.205.");'
+    testString: assert.strictEqual(euler262(), 2531.205, '<code>euler262()</code> should return 2531.205.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-263-an-engineers-dream-come-true.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-263-an-engineers-dream-come-true.english.md
index 5d02c60acc..95d55448cd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-263-an-engineers-dream-come-true.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-263-an-engineers-dream-come-true.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4741000cf542c50ff86
 challengeType: 5
-title: 'Problem 263: An engineers" dream come true'
+title: 'Problem 263: An engineers'' dream come true'
 ---
 
 ## Description
@@ -39,7 +39,7 @@ Find the sum of the first four engineers’ paradises.
 ```yml
 tests:
   - text: <code>euler263()</code> should return 2039506520.
-    testString: 'assert.strictEqual(euler263(), 2039506520, "<code>euler263()</code> should return 2039506520.");'
+    testString: assert.strictEqual(euler263(), 2039506520, '<code>euler263()</code> should return 2039506520.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-264-triangle-centres.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-264-triangle-centres.english.md
index a194a9d8b0..99b11e4164 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-264-triangle-centres.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-264-triangle-centres.english.md
@@ -40,7 +40,7 @@ Enter as your answer the sum of their perimeters rounded to four decimal places.
 ```yml
 tests:
   - text: <code>euler264()</code> should return 2816417.1055.
-    testString: 'assert.strictEqual(euler264(), 2816417.1055, "<code>euler264()</code> should return 2816417.1055.");'
+    testString: assert.strictEqual(euler264(), 2816417.1055, '<code>euler264()</code> should return 2816417.1055.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-265-binary-circles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-265-binary-circles.english.md
index ca54d2b0af..330de75da7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-265-binary-circles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-265-binary-circles.english.md
@@ -33,7 +33,7 @@ Find S(5).
 ```yml
 tests:
   - text: <code>euler265()</code> should return 209110240768.
-    testString: 'assert.strictEqual(euler265(), 209110240768, "<code>euler265()</code> should return 209110240768.");'
+    testString: assert.strictEqual(euler265(), 209110240768, '<code>euler265()</code> should return 209110240768.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-266-pseudo-square-root.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-266-pseudo-square-root.english.md
index cdd6b14bc3..5a768ecfad 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-266-pseudo-square-root.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-266-pseudo-square-root.english.md
@@ -27,7 +27,7 @@ Find PSR(p) mod 1016.
 ```yml
 tests:
   - text: <code>euler266()</code> should return 1096883702440585.
-    testString: 'assert.strictEqual(euler266(), 1096883702440585, "<code>euler266()</code> should return 1096883702440585.");'
+    testString: assert.strictEqual(euler266(), 1096883702440585, '<code>euler266()</code> should return 1096883702440585.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-267-billionaire.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-267-billionaire.english.md
index 75fd0ea438..f4b3de73ef 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-267-billionaire.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-267-billionaire.english.md
@@ -25,7 +25,7 @@ All computations are assumed to be exact (no rounding), but give your answer rou
 ```yml
 tests:
   - text: <code>euler267()</code> should return 0.999992836187.
-    testString: 'assert.strictEqual(euler267(), 0.999992836187, "<code>euler267()</code> should return 0.999992836187.");'
+    testString: assert.strictEqual(euler267(), 0.999992836187, '<code>euler267()</code> should return 0.999992836187.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-268-counting-numbers-with-at-least-four-distinct-prime-factors-less-than-100.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-268-counting-numbers-with-at-least-four-distinct-prime-factors-less-than-100.english.md
index b19b67c9b3..d6a9a3cec5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-268-counting-numbers-with-at-least-four-distinct-prime-factors-less-than-100.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-268-counting-numbers-with-at-least-four-distinct-prime-factors-less-than-100.english.md
@@ -22,7 +22,7 @@ Find how many positive integers less than 1016 are divisible by at least four di
 ```yml
 tests:
   - text: <code>euler268()</code> should return 785478606870985.
-    testString: 'assert.strictEqual(euler268(), 785478606870985, "<code>euler268()</code> should return 785478606870985.");'
+    testString: assert.strictEqual(euler268(), 785478606870985, '<code>euler268()</code> should return 785478606870985.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-269-polynomials-with-at-least-one-integer-root.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-269-polynomials-with-at-least-one-integer-root.english.md
index f35d720d6f..2891d7a4d4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-269-polynomials-with-at-least-one-integer-root.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-269-polynomials-with-at-least-one-integer-root.english.md
@@ -30,7 +30,7 @@ What is Z(1016)?
 ```yml
 tests:
   - text: <code>euler269()</code> should return 1311109198529286.
-    testString: 'assert.strictEqual(euler269(), 1311109198529286, "<code>euler269()</code> should return 1311109198529286.");'
+    testString: assert.strictEqual(euler269(), 1311109198529286, '<code>euler269()</code> should return 1311109198529286.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-27-quadratic-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-27-quadratic-primes.english.md
index ff974c392e..108b942034 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-27-quadratic-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-27-quadratic-primes.english.md
@@ -28,13 +28,13 @@ Find the product of the coefficients, $a$ and $b$, for the quadratic expression
 ```yml
 tests:
   - text: <code>quadraticPrimes(200)</code> should return -4925.
-    testString: 'assert(quadraticPrimes(200) == -4925, "<code>quadraticPrimes(200)</code> should return -4925.");'
+    testString: assert(quadraticPrimes(200) == -4925, '<code>quadraticPrimes(200)</code> should return -4925.');
   - text: <code>quadraticPrimes(500)</code> should return -18901.
-    testString: 'assert(quadraticPrimes(500) == -18901, "<code>quadraticPrimes(500)</code> should return -18901.");'
+    testString: assert(quadraticPrimes(500) == -18901, '<code>quadraticPrimes(500)</code> should return -18901.');
   - text: <code>quadraticPrimes(800)</code> should return -43835.
-    testString: 'assert(quadraticPrimes(800) == -43835, "<code>quadraticPrimes(800)</code> should return -43835.");'
+    testString: assert(quadraticPrimes(800) == -43835, '<code>quadraticPrimes(800)</code> should return -43835.');
   - text: <code>quadraticPrimes(1000)</code> should return -59231.
-    testString: 'assert(quadraticPrimes(1000) == -59231, "<code>quadraticPrimes(1000)</code> should return -59231.");'
+    testString: assert(quadraticPrimes(1000) == -59231, '<code>quadraticPrimes(1000)</code> should return -59231.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-270-cutting-squares.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-270-cutting-squares.english.md
index 8ed3ee075e..309c3c0ef5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-270-cutting-squares.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-270-cutting-squares.english.md
@@ -27,7 +27,7 @@ What is C(30) mod 108 ?
 ```yml
 tests:
   - text: <code>euler270()</code> should return 82282080.
-    testString: 'assert.strictEqual(euler270(), 82282080, "<code>euler270()</code> should return 82282080.");'
+    testString: assert.strictEqual(euler270(), 82282080, '<code>euler270()</code> should return 82282080.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-271-modular-cubes-part-1.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-271-modular-cubes-part-1.english.md
index bf88bb27e0..020db3630f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-271-modular-cubes-part-1.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-271-modular-cubes-part-1.english.md
@@ -26,7 +26,7 @@ Find S(13082761331670030).
 ```yml
 tests:
   - text: <code>euler271()</code> should return 4617456485273130000.
-    testString: 'assert.strictEqual(euler271(), 4617456485273130000, "<code>euler271()</code> should return 4617456485273130000.");'
+    testString: assert.strictEqual(euler271(), 4617456485273130000, '<code>euler271()</code> should return 4617456485273130000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-272-modular-cubes-part-2.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-272-modular-cubes-part-2.english.md
index 284cd17d73..16c777d0ed 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-272-modular-cubes-part-2.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-272-modular-cubes-part-2.english.md
@@ -26,7 +26,7 @@ Find the sum of the positive numbers n≤1011 for which C(n)=242.
 ```yml
 tests:
   - text: <code>euler272()</code> should return 8495585919506151000.
-    testString: 'assert.strictEqual(euler272(), 8495585919506151000, "<code>euler272()</code> should return 8495585919506151000.");'
+    testString: assert.strictEqual(euler272(), 8495585919506151000, '<code>euler272()</code> should return 8495585919506151000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-273-sum-of-squares.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-273-sum-of-squares.english.md
index aa848583bc..71097ff9b9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-273-sum-of-squares.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-273-sum-of-squares.english.md
@@ -26,7 +26,7 @@ Find ∑S(N), for all squarefree N only divisible by primes of the form 4k+1 wit
 ```yml
 tests:
   - text: <code>euler273()</code> should return 2032447591196869000.
-    testString: 'assert.strictEqual(euler273(), 2032447591196869000, "<code>euler273()</code> should return 2032447591196869000.");'
+    testString: assert.strictEqual(euler273(), 2032447591196869000, '<code>euler273()</code> should return 2032447591196869000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-274-divisibility-multipliers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-274-divisibility-multipliers.english.md
index 174028f934..272b2998fe 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-274-divisibility-multipliers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-274-divisibility-multipliers.english.md
@@ -32,7 +32,7 @@ The sum of the divisibility multipliers for the primes that are coprime to 10 an
 ```yml
 tests:
   - text: <code>euler274()</code> should return 1601912348822.
-    testString: 'assert.strictEqual(euler274(), 1601912348822, "<code>euler274()</code> should return 1601912348822.");'
+    testString: assert.strictEqual(euler274(), 1601912348822, '<code>euler274()</code> should return 1601912348822.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-275-balanced-sculptures.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-275-balanced-sculptures.english.md
index 6ab3ab8e7e..1820edc3fe 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-275-balanced-sculptures.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-275-balanced-sculptures.english.md
@@ -28,7 +28,7 @@ There are 964 balanced sculptures of order 10 and 360505 of order 15.How many ba
 ```yml
 tests:
   - text: <code>euler275()</code> should return 15030564.
-    testString: 'assert.strictEqual(euler275(), 15030564, "<code>euler275()</code> should return 15030564.");'
+    testString: assert.strictEqual(euler275(), 15030564, '<code>euler275()</code> should return 15030564.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-276-primitive-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-276-primitive-triangles.english.md
index ecae87df67..f3dc51b8f1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-276-primitive-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-276-primitive-triangles.english.md
@@ -22,7 +22,7 @@ How many primitive integer sided triangles exist with a perimeter not exceeding
 ```yml
 tests:
   - text: <code>euler276()</code> should return 5777137137739633000.
-    testString: 'assert.strictEqual(euler276(), 5777137137739633000, "<code>euler276()</code> should return 5777137137739633000.");'
+    testString: assert.strictEqual(euler276(), 5777137137739633000, '<code>euler276()</code> should return 5777137137739633000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-277-a-modified-collatz-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-277-a-modified-collatz-sequence.english.md
index 5398dd707c..0165a20a29 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-277-a-modified-collatz-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-277-a-modified-collatz-sequence.english.md
@@ -44,7 +44,7 @@ What is the smallest a1 > 1015 that begins with the sequence "UDDDUdddDDUDDddDdD
 ```yml
 tests:
   - text: <code>euler277()</code> should return 1125977393124310.
-    testString: 'assert.strictEqual(euler277(), 1125977393124310, "<code>euler277()</code> should return 1125977393124310.");'
+    testString: assert.strictEqual(euler277(), 1125977393124310, '<code>euler277()</code> should return 1125977393124310.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-278-linear-combinations-of-semiprimes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-278-linear-combinations-of-semiprimes.english.md
index 2047de7679..30386b8e6e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-278-linear-combinations-of-semiprimes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-278-linear-combinations-of-semiprimes.english.md
@@ -30,7 +30,7 @@ Find ∑ f(p*q,p*r,q*r), where p, q and r are prime numbers and p < q < r < 5000
 ```yml
 tests:
   - text: <code>euler278()</code> should return 1228215747273908500.
-    testString: 'assert.strictEqual(euler278(), 1228215747273908500, "<code>euler278()</code> should return 1228215747273908500.");'
+    testString: assert.strictEqual(euler278(), 1228215747273908500, '<code>euler278()</code> should return 1228215747273908500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-279-triangles-with-integral-sides-and-an-integral-angle.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-279-triangles-with-integral-sides-and-an-integral-angle.english.md
index 865e2bfdd2..46495ba022 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-279-triangles-with-integral-sides-and-an-integral-angle.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-279-triangles-with-integral-sides-and-an-integral-angle.english.md
@@ -20,7 +20,7 @@ How many triangles are there with integral sides, at least one integral angle (m
 ```yml
 tests:
   - text: <code>euler279()</code> should return 416577688.
-    testString: 'assert.strictEqual(euler279(), 416577688, "<code>euler279()</code> should return 416577688.");'
+    testString: assert.strictEqual(euler279(), 416577688, '<code>euler279()</code> should return 416577688.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-28-number-spiral-diagonals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-28-number-spiral-diagonals.english.md
index 627716adfc..f4f7bbff2a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-28-number-spiral-diagonals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-28-number-spiral-diagonals.english.md
@@ -27,13 +27,13 @@ What is the sum of the numbers on the diagonals in a n by n spiral formed in the
 ```yml
 tests:
   - text: <code>spiralDiagonals(101)</code> should return 692101.
-    testString: 'assert(spiralDiagonals(101) == 692101, "<code>spiralDiagonals(101)</code> should return 692101.");'
+    testString: assert(spiralDiagonals(101) == 692101, '<code>spiralDiagonals(101)</code> should return 692101.');
   - text: <code>spiralDiagonals(303)</code> should return 18591725.
-    testString: 'assert(spiralDiagonals(303) == 18591725, "<code>spiralDiagonals(303)</code> should return 18591725.");'
+    testString: assert(spiralDiagonals(303) == 18591725, '<code>spiralDiagonals(303)</code> should return 18591725.');
   - text: <code>spiralDiagonals(505)</code> should return 85986601.
-    testString: 'assert(spiralDiagonals(505) == 85986601, "<code>spiralDiagonals(505)</code> should return 85986601.");'
+    testString: assert(spiralDiagonals(505) == 85986601, '<code>spiralDiagonals(505)</code> should return 85986601.');
   - text: <code>spiralDiagonals(1001)</code> should return 669171001.
-    testString: 'assert(spiralDiagonals(1001) == 669171001, "<code>spiralDiagonals(1001)</code> should return 669171001.");'
+    testString: assert(spiralDiagonals(1001) == 669171001, '<code>spiralDiagonals(1001)</code> should return 669171001.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-280-ant-and-seeds.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-280-ant-and-seeds.english.md
index 08b5d2e06d..1b90be92a5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-280-ant-and-seeds.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-280-ant-and-seeds.english.md
@@ -25,7 +25,7 @@ Give your answer rounded to 6 decimal places.
 ```yml
 tests:
   - text: <code>euler280()</code> should return 430.088247.
-    testString: 'assert.strictEqual(euler280(), 430.088247, "<code>euler280()</code> should return 430.088247.");'
+    testString: assert.strictEqual(euler280(), 430.088247, '<code>euler280()</code> should return 430.088247.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-281-pizza-toppings.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-281-pizza-toppings.english.md
index ded32b6635..2e67901d96 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-281-pizza-toppings.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-281-pizza-toppings.english.md
@@ -28,7 +28,7 @@ Find the sum of all f(m,n) such that f(m,n) ≤ 1015.
 ```yml
 tests:
   - text: <code>euler281()</code> should return 1485776387445623.
-    testString: 'assert.strictEqual(euler281(), 1485776387445623, "<code>euler281()</code> should return 1485776387445623.");'
+    testString: assert.strictEqual(euler281(), 1485776387445623, '<code>euler281()</code> should return 1485776387445623.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-282-the-ackermann-function.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-282-the-ackermann-function.english.md
index 2ff63bd217..ea7a15b410 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-282-the-ackermann-function.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-282-the-ackermann-function.english.md
@@ -27,7 +27,7 @@ Find A(n, n) and give your answer mod 148.
 ```yml
 tests:
   - text: <code>euler282()</code> should return 1098988351.
-    testString: 'assert.strictEqual(euler282(), 1098988351, "<code>euler282()</code> should return 1098988351.");'
+    testString: assert.strictEqual(euler282(), 1098988351, '<code>euler282()</code> should return 1098988351.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-283-integer-sided-triangles-for-which-the-area--perimeter-ratio-is-integral.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-283-integer-sided-triangles-for-which-the-area--perimeter-ratio-is-integral.english.md
index 089960c809..8610d37a46 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-283-integer-sided-triangles-for-which-the-area--perimeter-ratio-is-integral.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-283-integer-sided-triangles-for-which-the-area--perimeter-ratio-is-integral.english.md
@@ -26,7 +26,7 @@ Find the sum of the perimeters of all integer sided triangles for which the area
 ```yml
 tests:
   - text: <code>euler283()</code> should return 28038042525570324.
-    testString: 'assert.strictEqual(euler283(), 28038042525570324, "<code>euler283()</code> should return 28038042525570324.");'
+    testString: assert.strictEqual(euler283(), 28038042525570324, '<code>euler283()</code> should return 28038042525570324.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-284-steady-squares.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-284-steady-squares.english.md
index c2681399fd..7e2b54ff63 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-284-steady-squares.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-284-steady-squares.english.md
@@ -27,7 +27,7 @@ Find the sum of the digits of all the n-digit steady squares in the base 14 numb
 ```yml
 tests:
   - text: <code>euler284()</code> should return 5a411d7b.
-    testString: 'assert.strictEqual(euler284(), 5a411d7b, "<code>euler284()</code> should return 5a411d7b.");'
+    testString: assert.strictEqual(euler284(), 5a411d7b, '<code>euler284()</code> should return 5a411d7b.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-285-pythagorean-odds.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-285-pythagorean-odds.english.md
index be099a45d0..cc1ccb51bc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-285-pythagorean-odds.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-285-pythagorean-odds.english.md
@@ -29,7 +29,7 @@ If he plays 105 turns with k = 1, k = 2, k = 3, ..., k = 105, wh
 ```yml
 tests:
   - text: <code>euler285()</code> should return 157055.80999.
-    testString: 'assert.strictEqual(euler285(), 157055.80999, "<code>euler285()</code> should return 157055.80999.");'
+    testString: assert.strictEqual(euler285(), 157055.80999, '<code>euler285()</code> should return 157055.80999.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-286-scoring-probabilities.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-286-scoring-probabilities.english.md
index 594338e86e..eccb6672bc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-286-scoring-probabilities.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-286-scoring-probabilities.english.md
@@ -24,7 +24,7 @@ Find q and give your answer rounded to 10 decimal places.
 ```yml
 tests:
   - text: <code>euler286()</code> should return 52.6494571953.
-    testString: 'assert.strictEqual(euler286(), 52.6494571953, "<code>euler286()</code> should return 52.6494571953.");'
+    testString: assert.strictEqual(euler286(), 52.6494571953, '<code>euler286()</code> should return 52.6494571953.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-287-quadtree-encoding-a-simple-compression-algorithm.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-287-quadtree-encoding-a-simple-compression-algorithm.english.md
index 03122423b5..28bcaada1e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-287-quadtree-encoding-a-simple-compression-algorithm.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-287-quadtree-encoding-a-simple-compression-algorithm.english.md
@@ -35,7 +35,7 @@ otherwise the pixel is white.What is the length of the minimal sequence describi
 ```yml
 tests:
   - text: <code>euler287()</code> should return 313135496.
-    testString: 'assert.strictEqual(euler287(), 313135496, "<code>euler287()</code> should return 313135496.");'
+    testString: assert.strictEqual(euler287(), 313135496, '<code>euler287()</code> should return 313135496.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-288-an-enormous-factorial.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-288-an-enormous-factorial.english.md
index 4735217955..630d857350 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-288-an-enormous-factorial.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-288-an-enormous-factorial.english.md
@@ -35,7 +35,7 @@ Find NF(61,107) mod 6110
 ```yml
 tests:
   - text: <code>euler288()</code> should return 605857431263982000.
-    testString: 'assert.strictEqual(euler288(), 605857431263982000, "<code>euler288()</code> should return 605857431263982000.");'
+    testString: assert.strictEqual(euler288(), 605857431263982000, '<code>euler288()</code> should return 605857431263982000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-289-eulerian-cycles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-289-eulerian-cycles.english.md
index 2b242b326c..33a5d5578f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-289-eulerian-cycles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-289-eulerian-cycles.english.md
@@ -34,7 +34,7 @@ Find L(6,10) mod 1010.
 ```yml
 tests:
   - text: <code>euler289()</code> should return 6567944538.
-    testString: 'assert.strictEqual(euler289(), 6567944538, "<code>euler289()</code> should return 6567944538.");'
+    testString: assert.strictEqual(euler289(), 6567944538, '<code>euler289()</code> should return 6567944538.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-29-distinct-powers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-29-distinct-powers.english.md
index 71cd15b1e6..50382442bd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-29-distinct-powers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-29-distinct-powers.english.md
@@ -27,13 +27,13 @@ How many distinct terms are in the sequence generated by ab for 2 ≤ a ≤ n an
 ```yml
 tests:
   - text: <code>distinctPowers(15)</code> should return 177.
-    testString: 'assert.strictEqual(distinctPowers(15), 177, "<code>distinctPowers(15)</code> should return 177.");'
+    testString: assert.strictEqual(distinctPowers(15), 177, '<code>distinctPowers(15)</code> should return 177.');
   - text: <code>distinctPowers(20)</code> should return 324.
-    testString: 'assert.strictEqual(distinctPowers(20), 324, "<code>distinctPowers(20)</code> should return 324.");'
+    testString: assert.strictEqual(distinctPowers(20), 324, '<code>distinctPowers(20)</code> should return 324.');
   - text: <code>distinctPowers(25)</code> should return 519.
-    testString: 'assert.strictEqual(distinctPowers(25), 519, "<code>distinctPowers(25)</code> should return 519.");'
+    testString: assert.strictEqual(distinctPowers(25), 519, '<code>distinctPowers(25)</code> should return 519.');
   - text: <code>distinctPowers(30)</code> should return 755.
-    testString: 'assert.strictEqual(distinctPowers(30), 755, "<code>distinctPowers(30)</code> should return 755.");'
+    testString: assert.strictEqual(distinctPowers(30), 755, '<code>distinctPowers(30)</code> should return 755.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-290-digital-signature.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-290-digital-signature.english.md
index 09e197dc8d..02fc7badcc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-290-digital-signature.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-290-digital-signature.english.md
@@ -20,7 +20,7 @@ How many integers 0 ≤ n < 1018 have the property that the sum of the digits of
 ```yml
 tests:
   - text: <code>euler290()</code> should return 20444710234716470.
-    testString: 'assert.strictEqual(euler290(), 20444710234716470, "<code>euler290()</code> should return 20444710234716470.");'
+    testString: assert.strictEqual(euler290(), 20444710234716470, '<code>euler290()</code> should return 20444710234716470.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-291-panaitopol-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-291-panaitopol-primes.english.md
index 58d97d9c43..b194af475d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-291-panaitopol-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-291-panaitopol-primes.english.md
@@ -23,7 +23,7 @@ Find how many Panaitopol primes are less than 5×1015.
 ```yml
 tests:
   - text: <code>euler291()</code> should return 4037526.
-    testString: 'assert.strictEqual(euler291(), 4037526, "<code>euler291()</code> should return 4037526.");'
+    testString: assert.strictEqual(euler291(), 4037526, '<code>euler291()</code> should return 4037526.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-292-pythagorean-polygons.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-292-pythagorean-polygons.english.md
index 53ab446de0..cb566d0495 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-292-pythagorean-polygons.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-292-pythagorean-polygons.english.md
@@ -27,7 +27,7 @@ Find P(120).
 ```yml
 tests:
   - text: <code>euler292()</code> should return 3600060866.
-    testString: 'assert.strictEqual(euler292(), 3600060866, "<code>euler292()</code> should return 3600060866.");'
+    testString: assert.strictEqual(euler292(), 3600060866, '<code>euler292()</code> should return 3600060866.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-293-pseudo-fortunate-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-293-pseudo-fortunate-numbers.english.md
index 2ac3784fba..9a4f1510d0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-293-pseudo-fortunate-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-293-pseudo-fortunate-numbers.english.md
@@ -32,7 +32,7 @@ Find the sum of all distinct pseudo-Fortunate numbers for admissible numbers N l
 ```yml
 tests:
   - text: <code>euler293()</code> should return 2209.
-    testString: 'assert.strictEqual(euler293(), 2209, "<code>euler293()</code> should return 2209.");'
+    testString: assert.strictEqual(euler293(), 2209, '<code>euler293()</code> should return 2209.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-294-sum-of-digits---experience-23.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-294-sum-of-digits---experience-23.english.md
index 7201b955ef..d51879997a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-294-sum-of-digits---experience-23.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-294-sum-of-digits---experience-23.english.md
@@ -31,7 +31,7 @@ Find S(1112) and give your answer mod 109.
 ```yml
 tests:
   - text: <code>euler294()</code> should return 789184709.
-    testString: 'assert.strictEqual(euler294(), 789184709, "<code>euler294()</code> should return 789184709.");'
+    testString: assert.strictEqual(euler294(), 789184709, '<code>euler294()</code> should return 789184709.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-295-lenticular-holes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-295-lenticular-holes.english.md
index 0db37a5ea4..e230b49eb5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-295-lenticular-holes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-295-lenticular-holes.english.md
@@ -42,7 +42,7 @@ Find L(100 000).
 ```yml
 tests:
   - text: <code>euler295()</code> should return 4884650818.
-    testString: 'assert.strictEqual(euler295(), 4884650818, "<code>euler295()</code> should return 4884650818.");'
+    testString: assert.strictEqual(euler295(), 4884650818, '<code>euler295()</code> should return 4884650818.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-296-angular-bisector-and-tangent.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-296-angular-bisector-and-tangent.english.md
index 29ef98b7b1..ff22ca36d1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-296-angular-bisector-and-tangent.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-296-angular-bisector-and-tangent.english.md
@@ -25,7 +25,7 @@ How many triangles ABC with a perimeter not exceeding 100 000 exist such that BE
 ```yml
 tests:
   - text: <code>euler296()</code> should return 1137208419.
-    testString: 'assert.strictEqual(euler296(), 1137208419, "<code>euler296()</code> should return 1137208419.");'
+    testString: assert.strictEqual(euler296(), 1137208419, '<code>euler296()</code> should return 1137208419.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-297-zeckendorf-representation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-297-zeckendorf-representation.english.md
index 284581f7fc..637fb76b71 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-297-zeckendorf-representation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-297-zeckendorf-representation.english.md
@@ -30,7 +30,7 @@ Find ∑ z(n) for 0<n<1017.
 ```yml
 tests:
   - text: <code>euler297()</code> should return 2252639041804718000.
-    testString: 'assert.strictEqual(euler297(), 2252639041804718000, "<code>euler297()</code> should return 2252639041804718000.");'
+    testString: assert.strictEqual(euler297(), 2252639041804718000, '<code>euler297()</code> should return 2252639041804718000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-298-selective-amnesia.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-298-selective-amnesia.english.md
index 678602b073..3dc6a27e28 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-298-selective-amnesia.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-298-selective-amnesia.english.md
@@ -94,7 +94,7 @@ Denoting Larry's score by L and Robin's score by R, what is the expected value o
 ```yml
 tests:
   - text: <code>euler298()</code> should return 1.76882294.
-    testString: 'assert.strictEqual(euler298(), 1.76882294, "<code>euler298()</code> should return 1.76882294.");'
+    testString: assert.strictEqual(euler298(), 1.76882294, '<code>euler298()</code> should return 1.76882294.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-299-three-similar-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-299-three-similar-triangles.english.md
index 79c8a0eb7a..ae27bd03fb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-299-three-similar-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-299-three-similar-triangles.english.md
@@ -33,7 +33,7 @@ If b+d < 100 000 000, how many distinct triplets (a,b,d) are there such that p
 ```yml
 tests:
   - text: <code>euler299()</code> should return 549936643.
-    testString: 'assert.strictEqual(euler299(), 549936643, "<code>euler299()</code> should return 549936643.");'
+    testString: assert.strictEqual(euler299(), 549936643, '<code>euler299()</code> should return 549936643.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-3-largest-prime-factor.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-3-largest-prime-factor.english.md
index 0b276ea243..961ecc011d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-3-largest-prime-factor.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-3-largest-prime-factor.english.md
@@ -21,17 +21,17 @@ What is the largest prime factor of the given <code>number</code>?
 ```yml
 tests:
   - text: <code>largestPrimeFactor(2)</code> should return 2.
-    testString: 'assert.strictEqual(largestPrimeFactor(2), 2, "<code>largestPrimeFactor(2)</code> should return 2.");'
+    testString: assert.strictEqual(largestPrimeFactor(2), 2, '<code>largestPrimeFactor(2)</code> should return 2.');
   - text: <code>largestPrimeFactor(3)</code> should return 3.
-    testString: 'assert.strictEqual(largestPrimeFactor(3), 3, "<code>largestPrimeFactor(3)</code> should return 3.");'
+    testString: assert.strictEqual(largestPrimeFactor(3), 3, '<code>largestPrimeFactor(3)</code> should return 3.');
   - text: <code>largestPrimeFactor(5)</code> should return 5.
-    testString: 'assert.strictEqual(largestPrimeFactor(5), 5, "<code>largestPrimeFactor(5)</code> should return 5.");'
+    testString: assert.strictEqual(largestPrimeFactor(5), 5, '<code>largestPrimeFactor(5)</code> should return 5.');
   - text: <code>largestPrimeFactor(7)</code> should return 7.
-    testString: 'assert.strictEqual(largestPrimeFactor(7), 7, "<code>largestPrimeFactor(7)</code> should return 7.");'
+    testString: assert.strictEqual(largestPrimeFactor(7), 7, '<code>largestPrimeFactor(7)</code> should return 7.');
   - text: <code>largestPrimeFactor(13195)</code> should return 29.
-    testString: 'assert.strictEqual(largestPrimeFactor(13195), 29, "<code>largestPrimeFactor(13195)</code> should return 29.");'
+    testString: assert.strictEqual(largestPrimeFactor(13195), 29, '<code>largestPrimeFactor(13195)</code> should return 29.');
   - text: <code>largestPrimeFactor(600851475143)</code> should return 6857.
-    testString: 'assert.strictEqual(largestPrimeFactor(600851475143), 6857, "<code>largestPrimeFactor(600851475143)</code> should return 6857.");'
+    testString: assert.strictEqual(largestPrimeFactor(600851475143), 6857, '<code>largestPrimeFactor(600851475143)</code> should return 6857.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-30-digit-n-powers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-30-digit-n-powers.english.md
index 4bfb3c4ef4..e5541106dc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-30-digit-n-powers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-30-digit-n-powers.english.md
@@ -26,13 +26,13 @@ Find the sum of all the numbers that can be written as the sum of n powers of th
 ```yml
 tests:
   - text: <code>digitnPowers(2)</code> should return 0.
-    testString: 'assert(digitnPowers(2) == 0, "<code>digitnPowers(2)</code> should return 0.");'
+    testString: assert(digitnPowers(2) == 0, '<code>digitnPowers(2)</code> should return 0.');
   - text: <code>digitnPowers(3)</code> should return 1301.
-    testString: 'assert(digitnPowers(3) == 1301, "<code>digitnPowers(3)</code> should return 1301.");'
+    testString: assert(digitnPowers(3) == 1301, '<code>digitnPowers(3)</code> should return 1301.');
   - text: <code>digitnPowers(4)</code> should return 19316.
-    testString: 'assert(digitnPowers(4) == 19316, "<code>digitnPowers(4)</code> should return 19316.");'
+    testString: assert(digitnPowers(4) == 19316, '<code>digitnPowers(4)</code> should return 19316.');
   - text: <code>digitnPowers(5)</code> should return 443839.
-    testString: 'assert(digitnPowers(5) == 443839, "<code>digitnPowers(5)</code> should return 443839.");'
+    testString: assert(digitnPowers(5) == 443839, '<code>digitnPowers(5)</code> should return 443839.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-300-protein-folding.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-300-protein-folding.english.md
index 6184b873a4..e5b1a4880d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-300-protein-folding.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-300-protein-folding.english.md
@@ -37,7 +37,7 @@ Give your answer using as many decimal places as necessary for an exact result.
 ```yml
 tests:
   - text: <code>euler300()</code> should return 8.0540771484375.
-    testString: 'assert.strictEqual(euler300(), 8.0540771484375, "<code>euler300()</code> should return 8.0540771484375.");'
+    testString: assert.strictEqual(euler300(), 8.0540771484375, '<code>euler300()</code> should return 8.0540771484375.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-301-nim.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-301-nim.english.md
index 7bedff04a5..80017fb24c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-301-nim.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-301-nim.english.md
@@ -35,7 +35,7 @@ For how many positive integers n ≤ 230 does X(n,2n,3n) = 0 ?
 ```yml
 tests:
   - text: <code>euler301()</code> should return 2178309.
-    testString: 'assert.strictEqual(euler301(), 2178309, "<code>euler301()</code> should return 2178309.");'
+    testString: assert.strictEqual(euler301(), 2178309, '<code>euler301()</code> should return 2178309.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-302-strong-achilles-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-302-strong-achilles-numbers.english.md
index 3d1f616401..537547569d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-302-strong-achilles-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-302-strong-achilles-numbers.english.md
@@ -38,7 +38,7 @@ How many Strong Achilles numbers are there below 1018?
 ```yml
 tests:
   - text: <code>euler302()</code> should return 1170060.
-    testString: 'assert.strictEqual(euler302(), 1170060, "<code>euler302()</code> should return 1170060.");'
+    testString: assert.strictEqual(euler302(), 1170060, '<code>euler302()</code> should return 1170060.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-303-multiples-with-small-digits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-303-multiples-with-small-digits.english.md
index 9e84e2e538..0d470251c7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-303-multiples-with-small-digits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-303-multiples-with-small-digits.english.md
@@ -24,7 +24,7 @@ Find .
 ```yml
 tests:
   - text: <code>euler303()</code> should return 1111981904675169.
-    testString: 'assert.strictEqual(euler303(), 1111981904675169, "<code>euler303()</code> should return 1111981904675169.");'
+    testString: assert.strictEqual(euler303(), 1111981904675169, '<code>euler303()</code> should return 1111981904675169.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-304-primonacci.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-304-primonacci.english.md
index f76ce0b3b8..b881408795 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-304-primonacci.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-304-primonacci.english.md
@@ -35,7 +35,7 @@ Give your answer mod 1234567891011.
 ```yml
 tests:
   - text: <code>euler304()</code> should return 283988410192.
-    testString: 'assert.strictEqual(euler304(), 283988410192, "<code>euler304()</code> should return 283988410192.");'
+    testString: assert.strictEqual(euler304(), 283988410192, '<code>euler304()</code> should return 283988410192.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-305-reflexive-position.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-305-reflexive-position.english.md
index a9c1607a61..5c9a850d6d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-305-reflexive-position.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-305-reflexive-position.english.md
@@ -31,7 +31,7 @@ Find ∑f(3k) for 1≤k≤13.
 ```yml
 tests:
   - text: <code>euler305()</code> should return 18174995535140.
-    testString: 'assert.strictEqual(euler305(), 18174995535140, "<code>euler305()</code> should return 18174995535140.");'
+    testString: assert.strictEqual(euler305(), 18174995535140, '<code>euler305()</code> should return 18174995535140.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-306-paper-strip-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-306-paper-strip-game.english.md
index b1300fefa7..b3ce1093a3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-306-paper-strip-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-306-paper-strip-game.english.md
@@ -37,7 +37,7 @@ For 1 ≤ n ≤ 1 000 000, how many values of n are there for which the first pl
 ```yml
 tests:
   - text: <code>euler306()</code> should return 852938.
-    testString: 'assert.strictEqual(euler306(), 852938, "<code>euler306()</code> should return 852938.");'
+    testString: assert.strictEqual(euler306(), 852938, '<code>euler306()</code> should return 852938.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-307-chip-defects.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-307-chip-defects.english.md
index 839bec1985..ff46a84dee 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-307-chip-defects.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-307-chip-defects.english.md
@@ -27,7 +27,7 @@ Find p(20 000, 1 000 000) and give your answer rounded to 10 decimal places in t
 ```yml
 tests:
   - text: <code>euler307()</code> should return 0.7311720251.
-    testString: 'assert.strictEqual(euler307(), 0.7311720251, "<code>euler307()</code> should return 0.7311720251.");'
+    testString: assert.strictEqual(euler307(), 0.7311720251, '<code>euler307()</code> should return 0.7311720251.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-308-an-amazing-prime-generating-automaton.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-308-an-amazing-prime-generating-automaton.english.md
index a642f01829..78a6d4619d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-308-an-amazing-prime-generating-automaton.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-308-an-amazing-prime-generating-automaton.english.md
@@ -58,7 +58,7 @@ If someone uses the above Fractran program to solve Project Euler Problem 7 (fin
 ```yml
 tests:
   - text: <code>euler308()</code> should return 1539669807660924.
-    testString: 'assert.strictEqual(euler308(), 1539669807660924, "<code>euler308()</code> should return 1539669807660924.");'
+    testString: assert.strictEqual(euler308(), 1539669807660924, '<code>euler308()</code> should return 1539669807660924.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-309-integer-ladders.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-309-integer-ladders.english.md
index 4f45c86adb..401ed521ba 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-309-integer-ladders.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-309-integer-ladders.english.md
@@ -30,7 +30,7 @@ For integer values x, y, h and 0 < x < y < 1 000 000, how many triplets (x,y,h)
 ```yml
 tests:
   - text: <code>euler309()</code> should return 210139.
-    testString: 'assert.strictEqual(euler309(), 210139, "<code>euler309()</code> should return 210139.");'
+    testString: assert.strictEqual(euler309(), 210139, '<code>euler309()</code> should return 210139.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-31-coin-sums.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-31-coin-sums.english.md
index aa2a553117..1c2a4e9075 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-31-coin-sums.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-31-coin-sums.english.md
@@ -24,13 +24,13 @@ How many different ways can £(n) be made using any number of coins?
 ```yml
 tests:
   - text: <code>coinSums(50)</code> should return 451.
-    testString: 'assert(coinSums(50) == 451, "<code>coinSums(50)</code> should return 451.");'
+    testString: assert(coinSums(50) == 451, '<code>coinSums(50)</code> should return 451.');
   - text: <code>coinSums(100)</code> should return 4563.
-    testString: 'assert(coinSums(100) == 4563, "<code>coinSums(100)</code> should return 4563.");'
+    testString: assert(coinSums(100) == 4563, '<code>coinSums(100)</code> should return 4563.');
   - text: <code>coinSums(150)</code> should return 21873.
-    testString: 'assert(coinSums(150) == 21873, "<code>coinSums(150)</code> should return 21873.");'
+    testString: assert(coinSums(150) == 21873, '<code>coinSums(150)</code> should return 21873.');
   - text: <code>coinSums(200)</code> should return 73682.
-    testString: 'assert(coinSums(200) == 73682, "<code>coinSums(200)</code> should return 73682.");'
+    testString: assert(coinSums(200) == 73682, '<code>coinSums(200)</code> should return 73682.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-310-nim-square.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-310-nim-square.english.md
index 18acd54937..e6bcb644e6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-310-nim-square.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-310-nim-square.english.md
@@ -26,7 +26,7 @@ Find the number of losing positions for the next player if 0≤a≤b≤c≤100 0
 ```yml
 tests:
   - text: <code>euler310()</code> should return 2586528661783.
-    testString: 'assert.strictEqual(euler310(), 2586528661783, "<code>euler310()</code> should return 2586528661783.");'
+    testString: assert.strictEqual(euler310(), 2586528661783, '<code>euler310()</code> should return 2586528661783.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-311-biclinic-integral-quadrilaterals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-311-biclinic-integral-quadrilaterals.english.md
index 9ad1c4e31b..68a5d5181d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-311-biclinic-integral-quadrilaterals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-311-biclinic-integral-quadrilaterals.english.md
@@ -34,7 +34,7 @@ Find B(10 000 000 000).
 ```yml
 tests:
   - text: <code>euler311()</code> should return 2466018557.
-    testString: 'assert.strictEqual(euler311(), 2466018557, "<code>euler311()</code> should return 2466018557.");'
+    testString: assert.strictEqual(euler311(), 2466018557, '<code>euler311()</code> should return 2466018557.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-312-cyclic-paths-on-sierpiski-graphs.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-312-cyclic-paths-on-sierpiski-graphs.english.md
index 2b288279cd..0704bf61e7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-312-cyclic-paths-on-sierpiski-graphs.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-312-cyclic-paths-on-sierpiski-graphs.english.md
@@ -38,7 +38,7 @@ Find C(C(C(10 000))) mod 138.
 ```yml
 tests:
   - text: <code>euler312()</code> should return 324681947.
-    testString: 'assert.strictEqual(euler312(), 324681947, "<code>euler312()</code> should return 324681947.");'
+    testString: assert.strictEqual(euler312(), 324681947, '<code>euler312()</code> should return 324681947.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-313-sliding-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-313-sliding-game.english.md
index 304e975cd4..1e9c71ce1c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-313-sliding-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-313-sliding-game.english.md
@@ -30,7 +30,7 @@ How many grids does S(m,n) = p2, where p < 106 is prime?
 ```yml
 tests:
   - text: <code>euler313()</code> should return 2057774861813004.
-    testString: 'assert.strictEqual(euler313(), 2057774861813004, "<code>euler313()</code> should return 2057774861813004.");'
+    testString: assert.strictEqual(euler313(), 2057774861813004, '<code>euler313()</code> should return 2057774861813004.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-314-the-mouse-on-the-moon.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-314-the-mouse-on-the-moon.english.md
index c661f1cd0b..86472e16d2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-314-the-mouse-on-the-moon.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-314-the-mouse-on-the-moon.english.md
@@ -37,7 +37,7 @@ Give your answer rounded to 8 places behind the decimal point in the form abc.de
 ```yml
 tests:
   - text: <code>euler314()</code> should return 132.52756426.
-    testString: 'assert.strictEqual(euler314(), 132.52756426, "<code>euler314()</code> should return 132.52756426.");'
+    testString: assert.strictEqual(euler314(), 132.52756426, '<code>euler314()</code> should return 132.52756426.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-315-digital-root-clocks.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-315-digital-root-clocks.english.md
index 319353fe17..6b67270885 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-315-digital-root-clocks.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-315-digital-root-clocks.english.md
@@ -66,7 +66,7 @@ Find the difference between the total number of transitions needed by Sam's cloc
 ```yml
 tests:
   - text: <code>euler315()</code> should return 13625242.
-    testString: 'assert.strictEqual(euler315(), 13625242, "<code>euler315()</code> should return 13625242.");'
+    testString: assert.strictEqual(euler315(), 13625242, '<code>euler315()</code> should return 13625242.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-316-numbers-in-decimal-expansions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-316-numbers-in-decimal-expansions.english.md
index 18d9584c86..511a42f8e7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-316-numbers-in-decimal-expansions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-316-numbers-in-decimal-expansions.english.md
@@ -34,7 +34,7 @@ Note:  represents the floor function.
 ```yml
 tests:
   - text: <code>euler316()</code> should return 542934735751917760.
-    testString: 'assert.strictEqual(euler316(), 542934735751917760, "<code>euler316()</code> should return 542934735751917760.");'
+    testString: assert.strictEqual(euler316(), 542934735751917760, '<code>euler316()</code> should return 542934735751917760.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-317-firecracker.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-317-firecracker.english.md
index 33c8c7f466..d569b082e9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-317-firecracker.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-317-firecracker.english.md
@@ -27,7 +27,7 @@ Give your answer rounded to four decimal places.
 ```yml
 tests:
   - text: <code>euler317()</code> should return 1856532.8455.
-    testString: 'assert.strictEqual(euler317(), 1856532.8455, "<code>euler317()</code> should return 1856532.8455.");'
+    testString: assert.strictEqual(euler317(), 1856532.8455, '<code>euler317()</code> should return 1856532.8455.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-318-2011-nines.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-318-2011-nines.english.md
index ede9570cf9..7b3e551304 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-318-2011-nines.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-318-2011-nines.english.md
@@ -46,7 +46,7 @@ Find ∑N(p,q) for p+q ≤ 2011.
 ```yml
 tests:
   - text: <code>euler318()</code> should return 709313889.
-    testString: 'assert.strictEqual(euler318(), 709313889, "<code>euler318()</code> should return 709313889.");'
+    testString: assert.strictEqual(euler318(), 709313889, '<code>euler318()</code> should return 709313889.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-319-bounded-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-319-bounded-sequences.english.md
index 068ca7efbf..06792a034f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-319-bounded-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-319-bounded-sequences.english.md
@@ -35,7 +35,7 @@ Find t(1010) and give your answer modulo 109.
 ```yml
 tests:
   - text: <code>euler319()</code> should return 268457129.
-    testString: 'assert.strictEqual(euler319(), 268457129, "<code>euler319()</code> should return 268457129.");'
+    testString: assert.strictEqual(euler319(), 268457129, '<code>euler319()</code> should return 268457129.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-32-pandigital-products.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-32-pandigital-products.english.md
index 3fed2904e7..18af70928f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-32-pandigital-products.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-32-pandigital-products.english.md
@@ -26,9 +26,9 @@ HINT: Some products can be obtained in more than one way so be sure to only incl
 ```yml
 tests:
   - text: <code>pandigitalProducts()</code> is a function.
-    testString: 'assert(typeof pandigitalProducts === "function", "<code>pandigitalProducts()</code> is a function.");'
+    testString: assert(typeof pandigitalProducts === 'function', '<code>pandigitalProducts()</code> is a function.');
   - text: <code>pandigitalProducts()</code> should return 45228.
-    testString: 'assert.strictEqual(pandigitalProducts(), 45228, "<code>pandigitalProducts()</code> should return 45228.");'
+    testString: assert.strictEqual(pandigitalProducts(), 45228, '<code>pandigitalProducts()</code> should return 45228.');
 
 ```
 
@@ -75,7 +75,7 @@ function pandigitalProducts() {
     return true;
   }
   function concatenateNums(...numbers) {
-    let digitStr = ";
+    let digitStr = '';
     for (let i = 0; i < numbers.length; i++) {
       digitStr += numbers[i].toString();
     }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-320-factorials-divisible-by-a-huge-integer.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-320-factorials-divisible-by-a-huge-integer.english.md
index d29f5146c7..2005617d5d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-320-factorials-divisible-by-a-huge-integer.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-320-factorials-divisible-by-a-huge-integer.english.md
@@ -28,7 +28,7 @@ Find S(1 000 000) mod 1018.
 ```yml
 tests:
   - text: <code>euler320()</code> should return 278157919195482660.
-    testString: 'assert.strictEqual(euler320(), 278157919195482660, "<code>euler320()</code> should return 278157919195482660.");'
+    testString: assert.strictEqual(euler320(), 278157919195482660, '<code>euler320()</code> should return 278157919195482660.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-321-swapping-counters.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-321-swapping-counters.english.md
index cca5564593..1f7091cd24 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-321-swapping-counters.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-321-swapping-counters.english.md
@@ -34,7 +34,7 @@ Find the sum of the first forty terms of this sequence.
 ```yml
 tests:
   - text: <code>euler321()</code> should return 2470433131948040.
-    testString: 'assert.strictEqual(euler321(), 2470433131948040, "<code>euler321()</code> should return 2470433131948040.");'
+    testString: assert.strictEqual(euler321(), 2470433131948040, '<code>euler321()</code> should return 2470433131948040.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-322-binomial-coefficients-divisible-by-10.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-322-binomial-coefficients-divisible-by-10.english.md
index 56cf231b55..e1a3c0aa38 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-322-binomial-coefficients-divisible-by-10.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-322-binomial-coefficients-divisible-by-10.english.md
@@ -24,7 +24,7 @@ Find T(1018, 1012-10).
 ```yml
 tests:
   - text: <code>euler322()</code> should return 999998760323314000.
-    testString: 'assert.strictEqual(euler322(), 999998760323314000, "<code>euler322()</code> should return 999998760323314000.");'
+    testString: assert.strictEqual(euler322(), 999998760323314000, '<code>euler322()</code> should return 999998760323314000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-323-bitwise-or-operations-on-random-integers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-323-bitwise-or-operations-on-random-integers.english.md
index 041ecb981d..7dd8834828 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-323-bitwise-or-operations-on-random-integers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-323-bitwise-or-operations-on-random-integers.english.md
@@ -27,7 +27,7 @@ Give your answer rounded to 10 digits after the decimal point.
 ```yml
 tests:
   - text: <code>euler323()</code> should return 6.3551758451.
-    testString: 'assert.strictEqual(euler323(), 6.3551758451, "<code>euler323()</code> should return 6.3551758451.");'
+    testString: assert.strictEqual(euler323(), 6.3551758451, '<code>euler323()</code> should return 6.3551758451.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-324-building-a-tower.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-324-building-a-tower.english.md
index ecdc8e88c8..5fb4733304 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-324-building-a-tower.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-324-building-a-tower.english.md
@@ -23,7 +23,7 @@ Find f(1010000) mod 100000007.
 ```yml
 tests:
   - text: <code>euler324()</code> should return 96972774.
-    testString: 'assert.strictEqual(euler324(), 96972774, "<code>euler324()</code> should return 96972774.");'
+    testString: assert.strictEqual(euler324(), 96972774, '<code>euler324()</code> should return 96972774.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-325-stone-game-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-325-stone-game-ii.english.md
index a2a36b6484..22b0fb22de 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-325-stone-game-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-325-stone-game-ii.english.md
@@ -44,7 +44,7 @@ Find S(1016) mod 710.
 ```yml
 tests:
   - text: <code>euler325()</code> should return 54672965.
-    testString: 'assert.strictEqual(euler325(), 54672965, "<code>euler325()</code> should return 54672965.");'
+    testString: assert.strictEqual(euler325(), 54672965, '<code>euler325()</code> should return 54672965.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-326-modulo-summations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-326-modulo-summations.english.md
index e38aae3130..0aebb4aeb9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-326-modulo-summations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-326-modulo-summations.english.md
@@ -33,7 +33,7 @@ Find f(1012,106).
 ```yml
 tests:
   - text: <code>euler326()</code> should return 1966666166408794400.
-    testString: 'assert.strictEqual(euler326(), 1966666166408794400, "<code>euler326()</code> should return 1966666166408794400.");'
+    testString: assert.strictEqual(euler326(), 1966666166408794400, '<code>euler326()</code> should return 1966666166408794400.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-327-rooms-of-doom.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-327-rooms-of-doom.english.md
index f2960d4684..77f91c14b0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-327-rooms-of-doom.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-327-rooms-of-doom.english.md
@@ -41,7 +41,7 @@ Find ΣM(C,30) for 3 ≤ C ≤ 40.
 ```yml
 tests:
   - text: <code>euler327()</code> should return 34315549139516.
-    testString: 'assert.strictEqual(euler327(), 34315549139516, "<code>euler327()</code> should return 34315549139516.");'
+    testString: assert.strictEqual(euler327(), 34315549139516, '<code>euler327()</code> should return 34315549139516.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-328-lowest-cost-search.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-328-lowest-cost-search.english.md
index 219769dd79..02ff236a80 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-328-lowest-cost-search.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-328-lowest-cost-search.english.md
@@ -42,7 +42,7 @@ Find C(n).
 ```yml
 tests:
   - text: <code>euler328()</code> should return 260511850222.
-    testString: 'assert.strictEqual(euler328(), 260511850222, "<code>euler328()</code> should return 260511850222.");'
+    testString: assert.strictEqual(euler328(), 260511850222, '<code>euler328()</code> should return 260511850222.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-329-prime-frog.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-329-prime-frog.english.md
index da37855388..cf5a562337 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-329-prime-frog.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-329-prime-frog.english.md
@@ -31,7 +31,7 @@ Give your answer as a fraction p/q in reduced form.
 ```yml
 tests:
   - text: <code>euler329()</code> should return 199740353 / 29386561536000.
-    testString: 'assert.strictEqual(euler329(), 199740353 / 29386561536000, "<code>euler329()</code> should return 199740353 / 29386561536000.");'
+    testString: assert.strictEqual(euler329(), 199740353 / 29386561536000, '<code>euler329()</code> should return 199740353 / 29386561536000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-33-digit-cancelling-fractions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-33-digit-cancelling-fractions.english.md
index 78c94c02bd..97b6000466 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-33-digit-cancelling-fractions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-33-digit-cancelling-fractions.english.md
@@ -23,7 +23,7 @@ If the product of these four fractions is given in its lowest common terms, find
 ```yml
 tests:
   - text: <code>digitCancellingFractions()</code> should return 100.
-    testString: 'assert.strictEqual(digitCancellingFractions(), 100, "<code>digitCancellingFractions()</code> should return 100.");'
+    testString: assert.strictEqual(digitCancellingFractions(), 100, '<code>digitCancellingFractions()</code> should return 100.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-330-eulers-number.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-330-eulers-number.english.md
index a821fd15ef..7c98f3d00b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-330-eulers-number.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-330-eulers-number.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4b71000cf542c50ffc9
 challengeType: 5
-title: 'Problem 330: Euler"s Number'
+title: 'Problem 330: Euler''s Number'
 ---
 
 ## Description
@@ -60,7 +60,7 @@ Find A(109) + B(109) and give your answer mod 77 777 777.
 ```yml
 tests:
   - text: <code>euler330()</code> should return 15955822.
-    testString: 'assert.strictEqual(euler330(), 15955822, "<code>euler330()</code> should return 15955822.");'
+    testString: assert.strictEqual(euler330(), 15955822, '<code>euler330()</code> should return 15955822.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-331-cross-flips.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-331-cross-flips.english.md
index 9c0fad77dd..40b972389b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-331-cross-flips.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-331-cross-flips.english.md
@@ -37,7 +37,7 @@ Find .
 ```yml
 tests:
   - text: <code>euler331()</code> should return 467178235146843500.
-    testString: 'assert.strictEqual(euler331(), 467178235146843500, "<code>euler331()</code> should return 467178235146843500.");'
+    testString: assert.strictEqual(euler331(), 467178235146843500, '<code>euler331()</code> should return 467178235146843500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-332-spherical-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-332-spherical-triangles.english.md
index 2971f3adb9..e6e79a340e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-332-spherical-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-332-spherical-triangles.english.md
@@ -33,7 +33,7 @@ Find  A(r). Give your answer rounded to six decimal places.
 ```yml
 tests:
   - text: <code>euler332()</code> should return 2717.751525.
-    testString: 'assert.strictEqual(euler332(), 2717.751525, "<code>euler332()</code> should return 2717.751525.");'
+    testString: assert.strictEqual(euler332(), 2717.751525, '<code>euler332()</code> should return 2717.751525.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-333-special-partitions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-333-special-partitions.english.md
index aff2c20ac6..00d019f00b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-333-special-partitions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-333-special-partitions.english.md
@@ -35,7 +35,7 @@ Find the sum of the primes q <1000000 such that P(q)=1.
 ```yml
 tests:
   - text: <code>euler333()</code> should return 3053105.
-    testString: 'assert.strictEqual(euler333(), 3053105, "<code>euler333()</code> should return 3053105.");'
+    testString: assert.strictEqual(euler333(), 3053105, '<code>euler333()</code> should return 3053105.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-334-spilling-the-beans.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-334-spilling-the-beans.english.md
index e3765926db..2e95c35711 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-334-spilling-the-beans.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-334-spilling-the-beans.english.md
@@ -74,7 +74,7 @@ Consider now 1500 adjacent bowls containing b1, b2,..., b1500 beans respectively
 ```yml
 tests:
   - text: <code>euler334()</code> should return 150320021261690850.
-    testString: 'assert.strictEqual(euler334(), 150320021261690850, "<code>euler334()</code> should return 150320021261690850.");'
+    testString: assert.strictEqual(euler334(), 150320021261690850, '<code>euler334()</code> should return 150320021261690850.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-335-gathering-the-beans.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-335-gathering-the-beans.english.md
index 4278dcf636..23847b80cd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-335-gathering-the-beans.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-335-gathering-the-beans.english.md
@@ -28,7 +28,7 @@ Find M(2k+1). Give your answer modulo 79.
 ```yml
 tests:
   - text: <code>euler335()</code> should return 5032316.
-    testString: 'assert.strictEqual(euler335(), 5032316, "<code>euler335()</code> should return 5032316.");'
+    testString: assert.strictEqual(euler335(), 5032316, '<code>euler335()</code> should return 5032316.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-336-maximix-arrangements.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-336-maximix-arrangements.english.md
index c6866f41f2..9033c7203e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-336-maximix-arrangements.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-336-maximix-arrangements.english.md
@@ -33,7 +33,7 @@ Find the 2011th lexicographic maximix arrangement for eleven carriages.
 ```yml
 tests:
   - text: <code>euler336()</code> should return CAGBIHEFJDK.
-    testString: 'assert.strictEqual(euler336(), CAGBIHEFJDK, "<code>euler336()</code> should return CAGBIHEFJDK.");'
+    testString: assert.strictEqual(euler336(), CAGBIHEFJDK, '<code>euler336()</code> should return CAGBIHEFJDK.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-337-totient-stairstep-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-337-totient-stairstep-sequences.english.md
index 03cbdd17ab..4d62d6a6e0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-337-totient-stairstep-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-337-totient-stairstep-sequences.english.md
@@ -29,7 +29,7 @@ Find S(20 000 000) mod 108.
 ```yml
 tests:
   - text: <code>euler337()</code> should return 85068035.
-    testString: 'assert.strictEqual(euler337(), 85068035, "<code>euler337()</code> should return 85068035.");'
+    testString: assert.strictEqual(euler337(), 85068035, '<code>euler337()</code> should return 85068035.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-338-cutting-rectangular-grid-paper.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-338-cutting-rectangular-grid-paper.english.md
index 25e67c338d..b13d7ca7f4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-338-cutting-rectangular-grid-paper.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-338-cutting-rectangular-grid-paper.english.md
@@ -37,7 +37,7 @@ Find G(1012). Give your answer modulo 108.
 ```yml
 tests:
   - text: <code>euler338()</code> should return 15614292.
-    testString: 'assert.strictEqual(euler338(), 15614292, "<code>euler338()</code> should return 15614292.");'
+    testString: assert.strictEqual(euler338(), 15614292, '<code>euler338()</code> should return 15614292.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-339-peredur-fab-efrawg.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-339-peredur-fab-efrawg.english.md
index 2cfea712de..8406d0ea3c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-339-peredur-fab-efrawg.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-339-peredur-fab-efrawg.english.md
@@ -29,7 +29,7 @@ Find E(10 000) and give your answer rounded to 6 places behind the decimal point
 ```yml
 tests:
   - text: <code>euler339()</code> should return 19823.542204.
-    testString: 'assert.strictEqual(euler339(), 19823.542204, "<code>euler339()</code> should return 19823.542204.");'
+    testString: assert.strictEqual(euler339(), 19823.542204, '<code>euler339()</code> should return 19823.542204.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-34-digit-factorials.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-34-digit-factorials.english.md
index b4acc1019d..d12fe504bc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-34-digit-factorials.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-34-digit-factorials.english.md
@@ -22,7 +22,7 @@ Note: as 1! = 1 and 2! = 2 are not sums they are not included.
 ```yml
 tests:
   - text: '<code>digitFactorial()</code> should return { sum: 40730, numbers: [145, 40585] }.'
-    testString: 'assert.deepEqual(digitFactorial(), { sum: 40730, numbers: [145, 40585] }, "<code>digitFactorial()</code> should return { sum: 40730, numbers: [145, 40585] }.");'
+    testString: "assert.deepEqual(digitFactorial(), { sum: 40730, numbers: [145, 40585] }, '<code>digitFactorial()</code> should return { sum: 40730, numbers: [145, 40585] }.');"
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-340-crazy-function.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-340-crazy-function.english.md
index 91451aa4c3..a96fdeb008 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-340-crazy-function.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-340-crazy-function.english.md
@@ -32,7 +32,7 @@ Find the last 9 digits of S(217, 721, 127).
 ```yml
 tests:
   - text: <code>euler340()</code> should return 291504964.
-    testString: 'assert.strictEqual(euler340(), 291504964, "<code>euler340()</code> should return 291504964.");'
+    testString: assert.strictEqual(euler340(), 291504964, '<code>euler340()</code> should return 291504964.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-341-golombs-self-describing-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-341-golombs-self-describing-sequence.english.md
index 04ee14cb16..77aaad5d0a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-341-golombs-self-describing-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-341-golombs-self-describing-sequence.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4c11000cf542c50ffd3
 challengeType: 5
-title: 'Problem 341: Golomb"s self-describing sequence'
+title: 'Problem 341: Golomb''s self-describing sequence'
 ---
 
 ## Description
@@ -28,7 +28,7 @@ Find ΣG(n3) for 1 ≤ n < 106.
 ```yml
 tests:
   - text: <code>euler341()</code> should return 56098610614277016.
-    testString: 'assert.strictEqual(euler341(), 56098610614277016, "<code>euler341()</code> should return 56098610614277016.");'
+    testString: assert.strictEqual(euler341(), 56098610614277016, '<code>euler341()</code> should return 56098610614277016.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-342-the-totient-of-a-square-is-a-cube.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-342-the-totient-of-a-square-is-a-cube.english.md
index 0f6fba96ae..bfe8cbc8a8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-342-the-totient-of-a-square-is-a-cube.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-342-the-totient-of-a-square-is-a-cube.english.md
@@ -28,7 +28,7 @@ Find the sum of all numbers n, 1 &lt n < 1010 such that φ(n2) is a cube.
 ```yml
 tests:
   - text: <code>euler342()</code> should return 5943040885644.
-    testString: 'assert.strictEqual(euler342(), 5943040885644, "<code>euler342()</code> should return 5943040885644.");'
+    testString: assert.strictEqual(euler342(), 5943040885644, '<code>euler342()</code> should return 5943040885644.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-343-fractional-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-343-fractional-sequences.english.md
index 1c57f4b924..5f59837efb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-343-fractional-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-343-fractional-sequences.english.md
@@ -41,7 +41,7 @@ Find Σf(k3) for 1 ≤ k ≤ 2×106.
 ```yml
 tests:
   - text: <code>euler343()</code> should return 269533451410884200.
-    testString: 'assert.strictEqual(euler343(), 269533451410884200, "<code>euler343()</code> should return 269533451410884200.");'
+    testString: assert.strictEqual(euler343(), 269533451410884200, '<code>euler343()</code> should return 269533451410884200.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-344-silver-dollar-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-344-silver-dollar-game.english.md
index 5e6394f013..2c70e26e75 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-344-silver-dollar-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-344-silver-dollar-game.english.md
@@ -40,7 +40,7 @@ Find W(1 000 000, 100) modulo the semiprime 1000 036 000 099 (= 1 000 003 · 1 0
 ```yml
 tests:
   - text: <code>euler344()</code> should return 65579304332.
-    testString: 'assert.strictEqual(euler344(), 65579304332, "<code>euler344()</code> should return 65579304332.");'
+    testString: assert.strictEqual(euler344(), 65579304332, '<code>euler344()</code> should return 65579304332.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-345-matrix-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-345-matrix-sum.english.md
index 7277bad6b2..3940a5c67b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-345-matrix-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-345-matrix-sum.english.md
@@ -45,7 +45,7 @@ Find the Matrix Sum of:
 ```yml
 tests:
   - text: <code>euler345()</code> should return 13938.
-    testString: 'assert.strictEqual(euler345(), 13938, "<code>euler345()</code> should return 13938.");'
+    testString: assert.strictEqual(euler345(), 13938, '<code>euler345()</code> should return 13938.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-346-strong-repunits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-346-strong-repunits.english.md
index 4ee41da49b..d0b0df7c39 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-346-strong-repunits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-346-strong-repunits.english.md
@@ -25,7 +25,7 @@ Find the sum of all strong repunits below 1012.
 ```yml
 tests:
   - text: <code>euler346()</code> should return 336108797689259260.
-    testString: 'assert.strictEqual(euler346(), 336108797689259260, "<code>euler346()</code> should return 336108797689259260.");'
+    testString: assert.strictEqual(euler346(), 336108797689259260, '<code>euler346()</code> should return 336108797689259260.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-347-largest-integer-divisible-by-two-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-347-largest-integer-divisible-by-two-primes.english.md
index a60140b6f4..f29f97a855 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-347-largest-integer-divisible-by-two-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-347-largest-integer-divisible-by-two-primes.english.md
@@ -34,7 +34,7 @@ Find S(10 000 000).
 ```yml
 tests:
   - text: <code>euler347()</code> should return 11109800204052.
-    testString: 'assert.strictEqual(euler347(), 11109800204052, "<code>euler347()</code> should return 11109800204052.");'
+    testString: assert.strictEqual(euler347(), 11109800204052, '<code>euler347()</code> should return 11109800204052.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-348-sum-of-a-square-and-a-cube.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-348-sum-of-a-square-and-a-cube.english.md
index 655554c78d..05c1494ec5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-348-sum-of-a-square-and-a-cube.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-348-sum-of-a-square-and-a-cube.english.md
@@ -29,7 +29,7 @@ Find the sum of the five smallest such palindromic numbers.
 ```yml
 tests:
   - text: <code>euler348()</code> should return 1004195061.
-    testString: 'assert.strictEqual(euler348(), 1004195061, "<code>euler348()</code> should return 1004195061.");'
+    testString: assert.strictEqual(euler348(), 1004195061, '<code>euler348()</code> should return 1004195061.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-349-langtons-ant.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-349-langtons-ant.english.md
index 1e4ced9d2d..b7e9232052 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-349-langtons-ant.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-349-langtons-ant.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4ca1000cf542c50ffdc
 challengeType: 5
-title: 'Problem 349: Langton"s ant'
+title: 'Problem 349: Langton''s ant'
 ---
 
 ## Description
@@ -25,7 +25,7 @@ Starting with a grid that is entirely white, how many squares are black after 10
 ```yml
 tests:
   - text: <code>euler349()</code> should return 115384615384614940.
-    testString: 'assert.strictEqual(euler349(), 115384615384614940, "<code>euler349()</code> should return 115384615384614940.");'
+    testString: assert.strictEqual(euler349(), 115384615384614940, '<code>euler349()</code> should return 115384615384614940.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-35-circular-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-35-circular-primes.english.md
index 3b03e11ff6..463120caf9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-35-circular-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-35-circular-primes.english.md
@@ -22,17 +22,17 @@ How many circular primes are there below n, whereas 100 <= n <= 1000000?
 ```yml
 tests:
   - text: <code>circularPrimes(100)</code> should return 13.
-    testString: 'assert(circularPrimes(100) == 13, "<code>circularPrimes(100)</code> should return 13.");'
+    testString: assert(circularPrimes(100) == 13, '<code>circularPrimes(100)</code> should return 13.');
   - text: <code>circularPrimes(100000)</code> should return 43.
-    testString: 'assert(circularPrimes(100000) == 43, "<code>circularPrimes(100000)</code> should return 43.");'
+    testString: assert(circularPrimes(100000) == 43, '<code>circularPrimes(100000)</code> should return 43.');
   - text: <code>circularPrimes(250000)</code> should return 45.
-    testString: 'assert(circularPrimes(250000) == 45, "<code>circularPrimes(250000)</code> should return 45.");'
+    testString: assert(circularPrimes(250000) == 45, '<code>circularPrimes(250000)</code> should return 45.');
   - text: <code>circularPrimes(500000)</code> should return 49.
-    testString: 'assert(circularPrimes(500000) == 49, "<code>circularPrimes(500000)</code> should return 49.");'
+    testString: assert(circularPrimes(500000) == 49, '<code>circularPrimes(500000)</code> should return 49.');
   - text: <code>circularPrimes(750000)</code> should return 49.
-    testString: 'assert(circularPrimes(750000) == 49, "<code>circularPrimes(750000)</code> should return 49.");'
+    testString: assert(circularPrimes(750000) == 49, '<code>circularPrimes(750000)</code> should return 49.');
   - text: <code>circularPrimes(1000000)</code> should return 55.
-    testString: 'assert(circularPrimes(1000000) == 55, "<code>circularPrimes(1000000)</code> should return 55.");'
+    testString: assert(circularPrimes(1000000) == 55, '<code>circularPrimes(1000000)</code> should return 55.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-350-constraining-the-least-greatest-and-the-greatest-least.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-350-constraining-the-least-greatest-and-the-greatest-least.english.md
index df41d4f853..cc6ea78490 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-350-constraining-the-least-greatest-and-the-greatest-least.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-350-constraining-the-least-greatest-and-the-greatest-least.english.md
@@ -33,7 +33,7 @@ Find f(106, 1012, 1018) mod 1014.
 ```yml
 tests:
   - text: <code>euler350()</code> should return 84664213.
-    testString: 'assert.strictEqual(euler350(), 84664213, "<code>euler350()</code> should return 84664213.");'
+    testString: assert.strictEqual(euler350(), 84664213, '<code>euler350()</code> should return 84664213.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-351-hexagonal-orchards.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-351-hexagonal-orchards.english.md
index 1933d31425..c0c331c213 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-351-hexagonal-orchards.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-351-hexagonal-orchards.english.md
@@ -39,7 +39,7 @@ Find H(100 000 000).
 ```yml
 tests:
   - text: <code>euler351()</code> should return 11762187201804552.
-    testString: 'assert.strictEqual(euler351(), 11762187201804552, "<code>euler351()</code> should return 11762187201804552.");'
+    testString: assert.strictEqual(euler351(), 11762187201804552, '<code>euler351()</code> should return 11762187201804552.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-352-blood-tests.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-352-blood-tests.english.md
index 07c531e56e..24aec29675 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-352-blood-tests.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-352-blood-tests.english.md
@@ -57,7 +57,7 @@ Give your answer rounded to six decimal places.
 ```yml
 tests:
   - text: <code>euler352()</code> should return 378563.260589.
-    testString: 'assert.strictEqual(euler352(), 378563.260589, "<code>euler352()</code> should return 378563.260589.");'
+    testString: assert.strictEqual(euler352(), 378563.260589, '<code>euler352()</code> should return 378563.260589.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-353-risky-moon.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-353-risky-moon.english.md
index 5cc198f5e4..c7cf176130 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-353-risky-moon.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-353-risky-moon.english.md
@@ -48,7 +48,7 @@ Give your answer rounded to 10 digits behind the decimal point in the form a.bcd
 ```yml
 tests:
   - text: <code>euler353()</code> should return 1.2759860331.
-    testString: 'assert.strictEqual(euler353(), 1.2759860331, "<code>euler353()</code> should return 1.2759860331.");'
+    testString: assert.strictEqual(euler353(), 1.2759860331, '<code>euler353()</code> should return 1.2759860331.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-354-distances-in-a-bees-honeycomb.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-354-distances-in-a-bees-honeycomb.english.md
index a86c01cb49..2e7e50290c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-354-distances-in-a-bees-honeycomb.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-354-distances-in-a-bees-honeycomb.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4cf1000cf542c50ffe1
 challengeType: 5
-title: 'Problem 354: Distances in a bee"s honeycomb'
+title: 'Problem 354: Distances in a bee''s honeycomb'
 ---
 
 ## Description
@@ -31,7 +31,7 @@ Find the number of L ≤ 5·1011 such that B(L) = 450.
 ```yml
 tests:
   - text: <code>euler354()</code> should return 58065134.
-    testString: 'assert.strictEqual(euler354(), 58065134, "<code>euler354()</code> should return 58065134.");'
+    testString: assert.strictEqual(euler354(), 58065134, '<code>euler354()</code> should return 58065134.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-355-maximal-coprime-subset.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-355-maximal-coprime-subset.english.md
index 2278933967..c110929f07 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-355-maximal-coprime-subset.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-355-maximal-coprime-subset.english.md
@@ -27,7 +27,7 @@ Find Co(200000).
 ```yml
 tests:
   - text: <code>euler355()</code> should return 1726545007.
-    testString: 'assert.strictEqual(euler355(), 1726545007, "<code>euler355()</code> should return 1726545007.");'
+    testString: assert.strictEqual(euler355(), 1726545007, '<code>euler355()</code> should return 1726545007.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-356-largest-roots-of-cubic-polynomials.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-356-largest-roots-of-cubic-polynomials.english.md
index 3543fe9da4..c4bdd26392 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-356-largest-roots-of-cubic-polynomials.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-356-largest-roots-of-cubic-polynomials.english.md
@@ -27,7 +27,7 @@ Note:  represents the floor function.
 ```yml
 tests:
   - text: <code>euler356()</code> should return 28010159.
-    testString: 'assert.strictEqual(euler356(), 28010159, "<code>euler356()</code> should return 28010159.");'
+    testString: assert.strictEqual(euler356(), 28010159, '<code>euler356()</code> should return 28010159.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-357-prime-generating-integers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-357-prime-generating-integers.english.md
index 0fcfabfd19..7c0c59b833 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-357-prime-generating-integers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-357-prime-generating-integers.english.md
@@ -25,7 +25,7 @@ for every divisor d of n, d+n/d is prime.
 ```yml
 tests:
   - text: <code>euler357()</code> should return 1739023853137.
-    testString: 'assert.strictEqual(euler357(), 1739023853137, "<code>euler357()</code> should return 1739023853137.");'
+    testString: assert.strictEqual(euler357(), 1739023853137, '<code>euler357()</code> should return 1739023853137.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-358-cyclic-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-358-cyclic-numbers.english.md
index ad54118511..ff59c16687 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-358-cyclic-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-358-cyclic-numbers.english.md
@@ -48,7 +48,7 @@ There is only one cyclic number for which, the eleven leftmost digits are 000000
 ```yml
 tests:
   - text: <code>euler358()</code> should return 3284144505.
-    testString: 'assert.strictEqual(euler358(), 3284144505, "<code>euler358()</code> should return 3284144505.");'
+    testString: assert.strictEqual(euler358(), 3284144505, '<code>euler358()</code> should return 3284144505.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-359-hilberts-new-hotel.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-359-hilberts-new-hotel.english.md
index 6245a844fb..912d779e6e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-359-hilberts-new-hotel.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-359-hilberts-new-hotel.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f4d31000cf542c50ffe6
 challengeType: 5
-title: 'Problem 359: Hilbert"s New Hotel'
+title: 'Problem 359: Hilbert''s New Hotel'
 ---
 
 ## Description
@@ -49,7 +49,7 @@ Find the sum of all P(f, r) for all positive f and r such that f × r = 71328803
 ```yml
 tests:
   - text: <code>euler359()</code> should return 40632119.
-    testString: 'assert.strictEqual(euler359(), 40632119, "<code>euler359()</code> should return 40632119.");'
+    testString: assert.strictEqual(euler359(), 40632119, '<code>euler359()</code> should return 40632119.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-36-double-base-palindromes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-36-double-base-palindromes.english.md
index 27572923a4..6588448e31 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-36-double-base-palindromes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-36-double-base-palindromes.english.md
@@ -22,13 +22,13 @@ Find the sum of all numbers, less than n, whereas 1000 <= n <= 1000000, which ar
 ```yml
 tests:
   - text: <code>doubleBasePalindromes(1000)</code> should return 1772.
-    testString: 'assert(doubleBasePalindromes(1000) == 1772, "<code>doubleBasePalindromes(1000)</code> should return 1772.");'
+    testString: assert(doubleBasePalindromes(1000) == 1772, '<code>doubleBasePalindromes(1000)</code> should return 1772.');
   - text: <code>doubleBasePalindromes(50000)</code> should return 105795.
-    testString: 'assert(doubleBasePalindromes(50000) == 105795, "<code>doubleBasePalindromes(50000)</code> should return 105795.");'
+    testString: assert(doubleBasePalindromes(50000) == 105795, '<code>doubleBasePalindromes(50000)</code> should return 105795.');
   - text: <code>doubleBasePalindromes(500000)</code> should return 286602.
-    testString: 'assert(doubleBasePalindromes(500000) == 286602, "<code>doubleBasePalindromes(500000)</code> should return 286602.");'
+    testString: assert(doubleBasePalindromes(500000) == 286602, '<code>doubleBasePalindromes(500000)</code> should return 286602.');
   - text: <code>doubleBasePalindromes(1000000)</code> should return 872187.
-    testString: 'assert(doubleBasePalindromes(1000000) == 872187, "<code>doubleBasePalindromes(1000000)</code> should return 872187.");'
+    testString: assert(doubleBasePalindromes(1000000) == 872187, '<code>doubleBasePalindromes(1000000)</code> should return 872187.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-360-scary-sphere.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-360-scary-sphere.english.md
index 5d51ad5ce1..fe92bd64e5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-360-scary-sphere.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-360-scary-sphere.english.md
@@ -31,7 +31,7 @@ Find S(1010).
 ```yml
 tests:
   - text: <code>euler360()</code> should return 878825614395267100.
-    testString: 'assert.strictEqual(euler360(), 878825614395267100, "<code>euler360()</code> should return 878825614395267100.");'
+    testString: assert.strictEqual(euler360(), 878825614395267100, '<code>euler360()</code> should return 878825614395267100.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-361-subsequence-of-thue-morse-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-361-subsequence-of-thue-morse-sequence.english.md
index 1ef64817e6..44206ca233 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-361-subsequence-of-thue-morse-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-361-subsequence-of-thue-morse-sequence.english.md
@@ -45,7 +45,7 @@ Find the last 9 digits of .
 ```yml
 tests:
   - text: <code>euler361()</code> should return 178476944.
-    testString: 'assert.strictEqual(euler361(), 178476944, "<code>euler361()</code> should return 178476944.");'
+    testString: assert.strictEqual(euler361(), 178476944, '<code>euler361()</code> should return 178476944.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-362-squarefree-factors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-362-squarefree-factors.english.md
index fa4bbea1a9..98d4de08b9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-362-squarefree-factors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-362-squarefree-factors.english.md
@@ -36,7 +36,7 @@ Find S(10 000 000 000).
 ```yml
 tests:
   - text: <code>euler362()</code> should return 457895958010.
-    testString: 'assert.strictEqual(euler362(), 457895958010, "<code>euler362()</code> should return 457895958010.");'
+    testString: assert.strictEqual(euler362(), 457895958010, '<code>euler362()</code> should return 457895958010.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-363-bzier-curves.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-363-bzier-curves.english.md
index 9205696161..61bdefad58 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-363-bzier-curves.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-363-bzier-curves.english.md
@@ -41,7 +41,7 @@ That is, if L is the length of the curve, calculate  100 × L − π/2π/2Give y
 ```yml
 tests:
   - text: <code>euler363()</code> should return 0.0000372091.
-    testString: 'assert.strictEqual(euler363(), 0.0000372091, "<code>euler363()</code> should return 0.0000372091.");'
+    testString: assert.strictEqual(euler363(), 0.0000372091, '<code>euler363()</code> should return 0.0000372091.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-364-comfortable-distance.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-364-comfortable-distance.english.md
index 37f2a534e3..169ead6628 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-364-comfortable-distance.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-364-comfortable-distance.english.md
@@ -32,7 +32,7 @@ Find T(1 000 000) mod 100 000 007.
 ```yml
 tests:
   - text: <code>euler364()</code> should return 44855254.
-    testString: 'assert.strictEqual(euler364(), 44855254, "<code>euler364()</code> should return 44855254.");'
+    testString: assert.strictEqual(euler364(), 44855254, '<code>euler364()</code> should return 44855254.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-365-a-huge-binomial-coefficient.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-365-a-huge-binomial-coefficient.english.md
index 0f248b404f..8a317311c9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-365-a-huge-binomial-coefficient.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-365-a-huge-binomial-coefficient.english.md
@@ -26,7 +26,7 @@ Calculate ∑M(1018,109,p*q*r) for 1000<p<q<r<5000 and p,q,r prime.
 ```yml
 tests:
   - text: <code>euler365()</code> should return 162619462356610300.
-    testString: 'assert.strictEqual(euler365(), 162619462356610300, "<code>euler365()</code> should return 162619462356610300.");'
+    testString: assert.strictEqual(euler365(), 162619462356610300, '<code>euler365()</code> should return 162619462356610300.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-366-stone-game-iii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-366-stone-game-iii.english.md
index fa075907b9..3cd20ff356 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-366-stone-game-iii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-366-stone-game-iii.english.md
@@ -43,7 +43,7 @@ Give your answer modulo 108.
 ```yml
 tests:
   - text: <code>euler366()</code> should return 88351299.
-    testString: 'assert.strictEqual(euler366(), 88351299, "<code>euler366()</code> should return 88351299.");'
+    testString: assert.strictEqual(euler366(), 88351299, '<code>euler366()</code> should return 88351299.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-367-bozo-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-367-bozo-sort.english.md
index e86647d2bb..45152e3b34 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-367-bozo-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-367-bozo-sort.english.md
@@ -36,7 +36,7 @@ Give your answer rounded to the nearest integer.
 ```yml
 tests:
   - text: <code>euler367()</code> should return 48271207.
-    testString: 'assert.strictEqual(euler367(), 48271207, "<code>euler367()</code> should return 48271207.");'
+    testString: assert.strictEqual(euler367(), 48271207, '<code>euler367()</code> should return 48271207.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-368-a-kempner-like-series.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-368-a-kempner-like-series.english.md
index f3932d22cf..ef5e007a77 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-368-a-kempner-like-series.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-368-a-kempner-like-series.english.md
@@ -33,7 +33,7 @@ Give your answer rounded to 10 digits behind the decimal point.
 ```yml
 tests:
   - text: <code>euler368()</code> should return 253.6135092068.
-    testString: 'assert.strictEqual(euler368(), 253.6135092068, "<code>euler368()</code> should return 253.6135092068.");'
+    testString: assert.strictEqual(euler368(), 253.6135092068, '<code>euler368()</code> should return 253.6135092068.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-369-badugi.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-369-badugi.english.md
index 53ff4d39b0..cd5d61abc3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-369-badugi.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-369-badugi.english.md
@@ -24,7 +24,7 @@ Find ∑f(n)  for 4 ≤ n ≤ 13.
 ```yml
 tests:
   - text: <code>euler369()</code> should return 862400558448.
-    testString: 'assert.strictEqual(euler369(), 862400558448, "<code>euler369()</code> should return 862400558448.");'
+    testString: assert.strictEqual(euler369(), 862400558448, '<code>euler369()</code> should return 862400558448.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-37-truncatable-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-37-truncatable-primes.english.md
index cdb31950ba..e99101725c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-37-truncatable-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-37-truncatable-primes.english.md
@@ -22,13 +22,13 @@ NOTE: 2, 3, 5, and 7 are not considered to be truncatable primes.
 ```yml
 tests:
   - text: <code>truncatablePrimes(8)</code> should return 1986.
-    testString: 'assert(truncatablePrimes(8) == 1986, "<code>truncatablePrimes(8)</code> should return 1986.");'
+    testString: assert(truncatablePrimes(8) == 1986, '<code>truncatablePrimes(8)</code> should return 1986.');
   - text: <code>truncatablePrimes(9)</code> should return 5123.
-    testString: 'assert(truncatablePrimes(9) == 5123, "<code>truncatablePrimes(9)</code> should return 5123.");'
+    testString: assert(truncatablePrimes(9) == 5123, '<code>truncatablePrimes(9)</code> should return 5123.');
   - text: <code>truncatablePrimes(10)</code> should return 8920.
-    testString: 'assert(truncatablePrimes(10) == 8920, "<code>truncatablePrimes(10)</code> should return 8920.");'
+    testString: assert(truncatablePrimes(10) == 8920, '<code>truncatablePrimes(10)</code> should return 8920.');
   - text: <code>truncatablePrimes(11)</code> should return 748317.
-    testString: 'assert(truncatablePrimes(11) == 748317, "<code>truncatablePrimes(11)</code> should return 748317.");'
+    testString: assert(truncatablePrimes(11) == 748317, '<code>truncatablePrimes(11)</code> should return 748317.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-370-geometric-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-370-geometric-triangles.english.md
index d3f1d331e8..a163e7cbd0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-370-geometric-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-370-geometric-triangles.english.md
@@ -26,7 +26,7 @@ How many geometric triangles exist with perimeter ≤ 2.5·1013 ?
 ```yml
 tests:
   - text: <code>euler370()</code> should return 41791929448408.
-    testString: 'assert.strictEqual(euler370(), 41791929448408, "<code>euler370()</code> should return 41791929448408.");'
+    testString: assert.strictEqual(euler370(), 41791929448408, '<code>euler370()</code> should return 41791929448408.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-371-licence-plates.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-371-licence-plates.english.md
index 13646e3f50..b932560384 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-371-licence-plates.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-371-licence-plates.english.md
@@ -32,7 +32,7 @@ Note: We assume that each licence plate seen is equally likely to have any three
 ```yml
 tests:
   - text: <code>euler371()</code> should return 40.66368097.
-    testString: 'assert.strictEqual(euler371(), 40.66368097, "<code>euler371()</code> should return 40.66368097.");'
+    testString: assert.strictEqual(euler371(), 40.66368097, '<code>euler371()</code> should return 40.66368097.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-372-pencils-of-rays.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-372-pencils-of-rays.english.md
index 79b76516e2..679bb7877f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-372-pencils-of-rays.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-372-pencils-of-rays.english.md
@@ -26,7 +26,7 @@ Note:  represents the floor function.
 ```yml
 tests:
   - text: <code>euler372()</code> should return 301450082318807040.
-    testString: 'assert.strictEqual(euler372(), 301450082318807040, "<code>euler372()</code> should return 301450082318807040.");'
+    testString: assert.strictEqual(euler372(), 301450082318807040, '<code>euler372()</code> should return 301450082318807040.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-373-circumscribed-circles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-373-circumscribed-circles.english.md
index 2d416cae93..00215ad261 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-373-circumscribed-circles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-373-circumscribed-circles.english.md
@@ -29,7 +29,7 @@ Find S(107).
 ```yml
 tests:
   - text: <code>euler373()</code> should return 727227472448913.
-    testString: 'assert.strictEqual(euler373(), 727227472448913, "<code>euler373()</code> should return 727227472448913.");'
+    testString: assert.strictEqual(euler373(), 727227472448913, '<code>euler373()</code> should return 727227472448913.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-374-maximum-integer-partition-product.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-374-maximum-integer-partition-product.english.md
index 466cd38ed0..337c23bd2d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-374-maximum-integer-partition-product.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-374-maximum-integer-partition-product.english.md
@@ -39,7 +39,7 @@ Give your answer modulo 982451653, the 50 millionth prime.
 ```yml
 tests:
   - text: <code>euler374()</code> should return 334420941.
-    testString: 'assert.strictEqual(euler374(), 334420941, "<code>euler374()</code> should return 334420941.");'
+    testString: assert.strictEqual(euler374(), 334420941, '<code>euler374()</code> should return 334420941.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-375-minimum-of-subsequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-375-minimum-of-subsequences.english.md
index fd33ac246d..c0eca39a8a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-375-minimum-of-subsequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-375-minimum-of-subsequences.english.md
@@ -35,7 +35,7 @@ Find M(2 000 000 000).
 ```yml
 tests:
   - text: <code>euler375()</code> should return 7435327983715286000.
-    testString: 'assert.strictEqual(euler375(), 7435327983715286000, "<code>euler375()</code> should return 7435327983715286000.");'
+    testString: assert.strictEqual(euler375(), 7435327983715286000, '<code>euler375()</code> should return 7435327983715286000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-376-nontransitive-sets-of-dice.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-376-nontransitive-sets-of-dice.english.md
index 743e080912..dbb83b9d0b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-376-nontransitive-sets-of-dice.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-376-nontransitive-sets-of-dice.english.md
@@ -56,7 +56,7 @@ How many are there for N = 30 ?
 ```yml
 tests:
   - text: <code>euler376()</code> should return 973059630185670.
-    testString: 'assert.strictEqual(euler376(), 973059630185670, "<code>euler376()</code> should return 973059630185670.");'
+    testString: assert.strictEqual(euler376(), 973059630185670, '<code>euler376()</code> should return 973059630185670.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-377-sum-of-digits-experience-13.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-377-sum-of-digits-experience-13.english.md
index 172ee84eee..41626ffa9a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-377-sum-of-digits-experience-13.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-377-sum-of-digits-experience-13.english.md
@@ -29,7 +29,7 @@ Give the last 9 digits as your answer.
 ```yml
 tests:
   - text: <code>euler377()</code> should return 732385277.
-    testString: 'assert.strictEqual(euler377(), 732385277, "<code>euler377()</code> should return 732385277.");'
+    testString: assert.strictEqual(euler377(), 732385277, '<code>euler377()</code> should return 732385277.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-378-triangle-triples.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-378-triangle-triples.english.md
index c3cae87c78..ede606b5db 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-378-triangle-triples.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-378-triangle-triples.english.md
@@ -38,7 +38,7 @@ Give the last 18 digits of your answer.
 ```yml
 tests:
   - text: <code>euler378()</code> should return 147534623725724700.
-    testString: 'assert.strictEqual(euler378(), 147534623725724700, "<code>euler378()</code> should return 147534623725724700.");'
+    testString: assert.strictEqual(euler378(), 147534623725724700, '<code>euler378()</code> should return 147534623725724700.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-379-least-common-multiple-count.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-379-least-common-multiple-count.english.md
index 8be7af9094..d09f90d9eb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-379-least-common-multiple-count.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-379-least-common-multiple-count.english.md
@@ -30,7 +30,7 @@ Find g(1012).
 ```yml
 tests:
   - text: <code>euler379()</code> should return 132314136838185.
-    testString: 'assert.strictEqual(euler379(), 132314136838185, "<code>euler379()</code> should return 132314136838185.");'
+    testString: assert.strictEqual(euler379(), 132314136838185, '<code>euler379()</code> should return 132314136838185.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-38-pandigital-multiples.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-38-pandigital-multiples.english.md
index 36d8319d4f..6ff66b5f06 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-38-pandigital-multiples.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-38-pandigital-multiples.english.md
@@ -26,7 +26,7 @@ What is the largest 1 to 9 pandigital 9-digit number that can be formed as the c
 ```yml
 tests:
   - text: <code>pandigitalMultiples()</code> should return 932718654.
-    testString: 'assert.strictEqual(pandigitalMultiples(), 932718654, "<code>pandigitalMultiples()</code> should return 932718654.");'
+    testString: assert.strictEqual(pandigitalMultiples(), 932718654, '<code>pandigitalMultiples()</code> should return 932718654.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-380-amazing-mazes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-380-amazing-mazes.english.md
index 6442dc6150..ebc1061b92 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-380-amazing-mazes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-380-amazing-mazes.english.md
@@ -33,7 +33,7 @@ E.g. if the answer is 1234567891011 then the answer format would be 1.2346e12.
 ```yml
 tests:
   - text: <code>euler380()</code> should return Infinity.
-    testString: 'assert.strictEqual(euler380(), Infinity, "<code>euler380()</code> should return Infinity.");'
+    testString: assert.strictEqual(euler380(), Infinity, '<code>euler380()</code> should return Infinity.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-381-prime-k-factorial.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-381-prime-k-factorial.english.md
index 00e5cba0f0..f1393d335d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-381-prime-k-factorial.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-381-prime-k-factorial.english.md
@@ -31,7 +31,7 @@ Find ∑S(p) for 5 ≤ p < 108.
 ```yml
 tests:
   - text: <code>euler381()</code> should return 139602943319822.
-    testString: 'assert.strictEqual(euler381(), 139602943319822, "<code>euler381()</code> should return 139602943319822.");'
+    testString: assert.strictEqual(euler381(), 139602943319822, '<code>euler381()</code> should return 139602943319822.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-382-generating-polygons.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-382-generating-polygons.english.md
index 174179bd93..2bfceb5141 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-382-generating-polygons.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-382-generating-polygons.english.md
@@ -43,7 +43,7 @@ Find the last 9 digits of f(1018).
 ```yml
 tests:
   - text: <code>euler382()</code> should return 697003956.
-    testString: 'assert.strictEqual(euler382(), 697003956, "<code>euler382()</code> should return 697003956.");'
+    testString: assert.strictEqual(euler382(), 697003956, '<code>euler382()</code> should return 697003956.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-383-divisibility-comparison-between-factorials.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-383-divisibility-comparison-between-factorials.english.md
index 18285a4ff2..59ec627f82 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-383-divisibility-comparison-between-factorials.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-383-divisibility-comparison-between-factorials.english.md
@@ -30,7 +30,7 @@ Find T5(1018).
 ```yml
 tests:
   - text: <code>euler383()</code> should return 22173624649806.
-    testString: 'assert.strictEqual(euler383(), 22173624649806, "<code>euler383()</code> should return 22173624649806.");'
+    testString: assert.strictEqual(euler383(), 22173624649806, '<code>euler383()</code> should return 22173624649806.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-384-rudin-shapiro-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-384-rudin-shapiro-sequence.english.md
index c2d6f36b61..2494a26cf7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-384-rudin-shapiro-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-384-rudin-shapiro-sequence.english.md
@@ -44,7 +44,7 @@ Find ΣGF(t) for 2≤t≤45.
 ```yml
 tests:
   - text: <code>euler384()</code> should return 3354706415856333000.
-    testString: 'assert.strictEqual(euler384(), 3354706415856333000, "<code>euler384()</code> should return 3354706415856333000.");'
+    testString: assert.strictEqual(euler384(), 3354706415856333000, '<code>euler384()</code> should return 3354706415856333000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-385-ellipses-inside-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-385-ellipses-inside-triangles.english.md
index 544ffe27d5..fd7ee20d0d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-385-ellipses-inside-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-385-ellipses-inside-triangles.english.md
@@ -40,7 +40,7 @@ Find A(1 000 000 000).
 ```yml
 tests:
   - text: <code>euler385()</code> should return 3776957309612154000.
-    testString: 'assert.strictEqual(euler385(), 3776957309612154000, "<code>euler385()</code> should return 3776957309612154000.");'
+    testString: assert.strictEqual(euler385(), 3776957309612154000, '<code>euler385()</code> should return 3776957309612154000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-386-maximum-length-of-an-antichain.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-386-maximum-length-of-an-antichain.english.md
index d7abf76f69..3d0fffaf9b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-386-maximum-length-of-an-antichain.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-386-maximum-length-of-an-antichain.english.md
@@ -30,7 +30,7 @@ Find ΣN(n) for 1 ≤ n ≤ 108
 ```yml
 tests:
   - text: <code>euler386()</code> should return 528755790.
-    testString: 'assert.strictEqual(euler386(), 528755790, "<code>euler386()</code> should return 528755790.");'
+    testString: assert.strictEqual(euler386(), 528755790, '<code>euler386()</code> should return 528755790.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-387-harshad-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-387-harshad-numbers.english.md
index 763207000b..d93ebbe888 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-387-harshad-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-387-harshad-numbers.english.md
@@ -36,7 +36,7 @@ Find the sum of the strong, right truncatable Harshad primes less than 1014.
 ```yml
 tests:
   - text: <code>euler387()</code> should return 696067597313468.
-    testString: 'assert.strictEqual(euler387(), 696067597313468, "<code>euler387()</code> should return 696067597313468.");'
+    testString: assert.strictEqual(euler387(), 696067597313468, '<code>euler387()</code> should return 696067597313468.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-388-distinct-lines.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-388-distinct-lines.english.md
index 587d023470..41a431ba3a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-388-distinct-lines.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-388-distinct-lines.english.md
@@ -29,7 +29,7 @@ Find D(1010). Give as your answer the first nine digits followed by the last nin
 ```yml
 tests:
   - text: <code>euler388()</code> should return 831907372805130000.
-    testString: 'assert.strictEqual(euler388(), 831907372805130000, "<code>euler388()</code> should return 831907372805130000.");'
+    testString: assert.strictEqual(euler388(), 831907372805130000, '<code>euler388()</code> should return 831907372805130000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-389-platonic-dice.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-389-platonic-dice.english.md
index 1effc3812f..323c71d847 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-389-platonic-dice.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-389-platonic-dice.english.md
@@ -21,7 +21,7 @@ Find the variance of I, and give your answer rounded to 4 decimal places.
 ```yml
 tests:
   - text: <code>euler389()</code> should return 2406376.3623.
-    testString: 'assert.strictEqual(euler389(), 2406376.3623, "<code>euler389()</code> should return 2406376.3623.");'
+    testString: assert.strictEqual(euler389(), 2406376.3623, '<code>euler389()</code> should return 2406376.3623.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-39-integer-right-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-39-integer-right-triangles.english.md
index 91b49b913f..ec93d73aa1 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-39-integer-right-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-39-integer-right-triangles.english.md
@@ -22,13 +22,13 @@ For which value of p ≤ n, is the number of solutions maximised?
 ```yml
 tests:
   - text: <code>intRightTriangles(500)</code> should return 420.
-    testString: 'assert(intRightTriangles(500) == 420, "<code>intRightTriangles(500)</code> should return 420.");'
+    testString: assert(intRightTriangles(500) == 420, '<code>intRightTriangles(500)</code> should return 420.');
   - text: <code>intRightTriangles(800)</code> should return 420.
-    testString: 'assert(intRightTriangles(800) == 420, "<code>intRightTriangles(800)</code> should return 420.");'
+    testString: assert(intRightTriangles(800) == 420, '<code>intRightTriangles(800)</code> should return 420.');
   - text: <code>intRightTriangles(900)</code> should return 840.
-    testString: 'assert(intRightTriangles(900) == 840, "<code>intRightTriangles(900)</code> should return 840.");'
+    testString: assert(intRightTriangles(900) == 840, '<code>intRightTriangles(900)</code> should return 840.');
   - text: <code>intRightTriangles(1000)</code> should return 840.
-    testString: 'assert(intRightTriangles(1000) == 840, "<code>intRightTriangles(1000)</code> should return 840.");'
+    testString: assert(intRightTriangles(1000) == 840, '<code>intRightTriangles(1000)</code> should return 840.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-390-triangles-with-non-rational-sides-and-integral-area.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-390-triangles-with-non-rational-sides-and-integral-area.english.md
index b6407af9cb..4a544505fb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-390-triangles-with-non-rational-sides-and-integral-area.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-390-triangles-with-non-rational-sides-and-integral-area.english.md
@@ -29,7 +29,7 @@ Find S(1010).
 ```yml
 tests:
   - text: <code>euler390()</code> should return 2919133642971.
-    testString: 'assert.strictEqual(euler390(), 2919133642971, "<code>euler390()</code> should return 2919133642971.");'
+    testString: assert.strictEqual(euler390(), 2919133642971, '<code>euler390()</code> should return 2919133642971.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-391-hopping-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-391-hopping-game.english.md
index 148f9ebafe..8deadefaf0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-391-hopping-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-391-hopping-game.english.md
@@ -47,7 +47,7 @@ Find Σ(M(n))3 for 1 ≤ n ≤ 1000.
 ```yml
 tests:
   - text: <code>euler391()</code> should return 61029882288.
-    testString: 'assert.strictEqual(euler391(), 61029882288, "<code>euler391()</code> should return 61029882288.");'
+    testString: assert.strictEqual(euler391(), 61029882288, '<code>euler391()</code> should return 61029882288.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-392-enmeshed-unit-circle.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-392-enmeshed-unit-circle.english.md
index 19f2310e9b..d55a98b730 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-392-enmeshed-unit-circle.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-392-enmeshed-unit-circle.english.md
@@ -36,7 +36,7 @@ Give as your answer the area occupied by the red cells rounded to 10 digits behi
 ```yml
 tests:
   - text: <code>euler392()</code> should return 3.1486734435.
-    testString: 'assert.strictEqual(euler392(), 3.1486734435, "<code>euler392()</code> should return 3.1486734435.");'
+    testString: assert.strictEqual(euler392(), 3.1486734435, '<code>euler392()</code> should return 3.1486734435.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-393-migrating-ants.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-393-migrating-ants.english.md
index 2d54e46d34..7e01c5bab5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-393-migrating-ants.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-393-migrating-ants.english.md
@@ -26,7 +26,7 @@ Find  f(10).
 ```yml
 tests:
   - text: <code>euler393()</code> should return 112398351350823100.
-    testString: 'assert.strictEqual(euler393(), 112398351350823100, "<code>euler393()</code> should return 112398351350823100.");'
+    testString: assert.strictEqual(euler393(), 112398351350823100, '<code>euler393()</code> should return 112398351350823100.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-394-eating-pie.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-394-eating-pie.english.md
index 79f6441589..01631488ee 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-394-eating-pie.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-394-eating-pie.english.md
@@ -36,7 +36,7 @@ Find E(40) rounded to 10 decimal places behind the decimal point.
 ```yml
 tests:
   - text: <code>euler394()</code> should return 3.2370342194.
-    testString: 'assert.strictEqual(euler394(), 3.2370342194, "<code>euler394()</code> should return 3.2370342194.");'
+    testString: assert.strictEqual(euler394(), 3.2370342194, '<code>euler394()</code> should return 3.2370342194.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-395-pythagorean-tree.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-395-pythagorean-tree.english.md
index efe1ee5d99..cfedfcfb4c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-395-pythagorean-tree.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-395-pythagorean-tree.english.md
@@ -38,7 +38,7 @@ Find the smallest area possible for such a bounding rectangle, and give your ans
 ```yml
 tests:
   - text: <code>euler395()</code> should return 28.2453753155.
-    testString: 'assert.strictEqual(euler395(), 28.2453753155, "<code>euler395()</code> should return 28.2453753155.");'
+    testString: assert.strictEqual(euler395(), 28.2453753155, '<code>euler395()</code> should return 28.2453753155.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-396-weak-goodstein-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-396-weak-goodstein-sequence.english.md
index dc5c04c36b..66f4b4cf5e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-396-weak-goodstein-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-396-weak-goodstein-sequence.english.md
@@ -44,7 +44,7 @@ Find the last 9 digits of ΣG(n) for 1 ≤ n < 16.
 ```yml
 tests:
   - text: <code>euler396()</code> should return 173214653.
-    testString: 'assert.strictEqual(euler396(), 173214653, "<code>euler396()</code> should return 173214653.");'
+    testString: assert.strictEqual(euler396(), 173214653, '<code>euler396()</code> should return 173214653.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-397-triangle-on-parabola.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-397-triangle-on-parabola.english.md
index f04965a632..e89681e897 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-397-triangle-on-parabola.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-397-triangle-on-parabola.english.md
@@ -27,7 +27,7 @@ Find F(106, 109).
 ```yml
 tests:
   - text: <code>euler397()</code> should return 141630459461893730.
-    testString: 'assert.strictEqual(euler397(), 141630459461893730, "<code>euler397()</code> should return 141630459461893730.");'
+    testString: assert.strictEqual(euler397(), 141630459461893730, '<code>euler397()</code> should return 141630459461893730.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-398-cutting-rope.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-398-cutting-rope.english.md
index b326196254..297b889206 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-398-cutting-rope.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-398-cutting-rope.english.md
@@ -29,7 +29,7 @@ Give your answer rounded to 5 decimal places behind the decimal point.
 ```yml
 tests:
   - text: <code>euler398()</code> should return 2010.59096.
-    testString: 'assert.strictEqual(euler398(), 2010.59096, "<code>euler398()</code> should return 2010.59096.");'
+    testString: assert.strictEqual(euler398(), 2010.59096, '<code>euler398()</code> should return 2010.59096.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-399-squarefree-fibonacci-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-399-squarefree-fibonacci-numbers.english.md
index dacb318ecd..6df09c25ce 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-399-squarefree-fibonacci-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-399-squarefree-fibonacci-numbers.english.md
@@ -40,8 +40,8 @@ If it happens that the conjecture is false, then the accepted answer to this pro
 
 ```yml
 tests:
-  - text: '<code>euler399()</code> should return 1508395636674243, 6.5e27330467.'
-    testString: 'assert.strictEqual(euler399(), 1508395636674243, 6.5e27330467, "<code>euler399()</code> should return 1508395636674243, 6.5e27330467.");'
+  - text: <code>euler399()</code> should return 1508395636674243, 6.5e27330467.
+    testString: assert.strictEqual(euler399(), 1508395636674243, 6.5e27330467, '<code>euler399()</code> should return 1508395636674243, 6.5e27330467.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-4-largest-palindrome-product.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-4-largest-palindrome-product.english.md
index fad6869c89..6f339040a2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-4-largest-palindrome-product.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-4-largest-palindrome-product.english.md
@@ -21,9 +21,9 @@ Find the largest palindrome made from the product of two <code>n</code>-digit nu
 ```yml
 tests:
   - text: <code>largestPalindromeProduct(2)</code> should return 9009.
-    testString: 'assert.strictEqual(largestPalindromeProduct(2), 9009, "<code>largestPalindromeProduct(2)</code> should return 9009.");'
+    testString: assert.strictEqual(largestPalindromeProduct(2), 9009, '<code>largestPalindromeProduct(2)</code> should return 9009.');
   - text: <code>largestPalindromeProduct(3)</code> should return 906609.
-    testString: 'assert.strictEqual(largestPalindromeProduct(3), 906609, "<code>largestPalindromeProduct(3)</code> should return 906609.");'
+    testString: assert.strictEqual(largestPalindromeProduct(3), 906609, '<code>largestPalindromeProduct(3)</code> should return 906609.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-40-champernownes-constant.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-40-champernownes-constant.english.md
index df6a447a61..9dae37dbaf 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-40-champernownes-constant.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-40-champernownes-constant.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f3941000cf542c50fea7
 challengeType: 5
-title: 'Problem 40: Champernowne"s constant'
+title: 'Problem 40: Champernowne''s constant'
 ---
 
 ## Description
@@ -24,11 +24,11 @@ If <i>d<sub>n</sub></i> represents the <i>n</i><sup>th</sup> digit of the fracti
 ```yml
 tests:
   - text: <code>champernownesConstant(100)</code> should return 5.
-    testString: 'assert.strictEqual(champernownesConstant(100), 5, "<code>champernownesConstant(100)</code> should return 5.");'
+    testString: assert.strictEqual(champernownesConstant(100), 5, '<code>champernownesConstant(100)</code> should return 5.');
   - text: <code>champernownesConstant(1000)</code> should return 15.
-    testString: 'assert.strictEqual(champernownesConstant(1000), 15, "<code>champernownesConstant(1000)</code> should return 15.");'
+    testString: assert.strictEqual(champernownesConstant(1000), 15, '<code>champernownesConstant(1000)</code> should return 15.');
   - text: <code>champernownesConstant(1000000)</code> should return 210.
-    testString: 'assert.strictEqual(champernownesConstant(1000000), 210, "<code>champernownesConstant(1000000)</code> should return 210.");'
+    testString: assert.strictEqual(champernownesConstant(1000000), 210, '<code>champernownesConstant(1000000)</code> should return 210.');
 
 ```
 
@@ -60,7 +60,7 @@ champernownesConstant(100);
 
 ```js
 function champernownesConstant(n) {
-  let fractionalPart = ";
+  let fractionalPart = '';
   for (let i = 0; fractionalPart.length <= n; i++) {
     fractionalPart += i.toString();
   }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-400-fibonacci-tree-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-400-fibonacci-tree-game.english.md
index 051e7c3833..7101d61b7a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-400-fibonacci-tree-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-400-fibonacci-tree-game.english.md
@@ -41,7 +41,7 @@ Find f(10000). Give the last 18 digits of your answer.
 ```yml
 tests:
   - text: <code>euler400()</code> should return 438505383468410600.
-    testString: 'assert.strictEqual(euler400(), 438505383468410600, "<code>euler400()</code> should return 438505383468410600.");'
+    testString: assert.strictEqual(euler400(), 438505383468410600, '<code>euler400()</code> should return 438505383468410600.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-401-sum-of-squares-of-divisors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-401-sum-of-squares-of-divisors.english.md
index a43a6edd9c..eaf11ff1de 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-401-sum-of-squares-of-divisors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-401-sum-of-squares-of-divisors.english.md
@@ -31,7 +31,7 @@ Find SIGMA2(1015) modulo 109.
 ```yml
 tests:
   - text: <code>euler401()</code> should return 281632621.
-    testString: 'assert.strictEqual(euler401(), 281632621, "<code>euler401()</code> should return 281632621.");'
+    testString: assert.strictEqual(euler401(), 281632621, '<code>euler401()</code> should return 281632621.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-402-integer-valued-polynomials.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-402-integer-valued-polynomials.english.md
index 6ddc603bc7..d03c12573e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-402-integer-valued-polynomials.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-402-integer-valued-polynomials.english.md
@@ -37,7 +37,7 @@ Find the last 9 digits of Σ S(Fk) for 2 ≤ k ≤ 1234567890123.
 ```yml
 tests:
   - text: <code>euler402()</code> should return 356019862.
-    testString: 'assert.strictEqual(euler402(), 356019862, "<code>euler402()</code> should return 356019862.");'
+    testString: assert.strictEqual(euler402(), 356019862, '<code>euler402()</code> should return 356019862.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-403-lattice-points-enclosed-by-parabola-and-line.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-403-lattice-points-enclosed-by-parabola-and-line.english.md
index b42b7be59e..e130e79ce6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-403-lattice-points-enclosed-by-parabola-and-line.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-403-lattice-points-enclosed-by-parabola-and-line.english.md
@@ -31,7 +31,7 @@ Find S(1012). Give your answer mod 108.
 ```yml
 tests:
   - text: <code>euler403()</code> should return 18224771.
-    testString: 'assert.strictEqual(euler403(), 18224771, "<code>euler403()</code> should return 18224771.");'
+    testString: assert.strictEqual(euler403(), 18224771, '<code>euler403()</code> should return 18224771.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-404-crisscross-ellipses.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-404-crisscross-ellipses.english.md
index c74527ed90..a5e10ac37e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-404-crisscross-ellipses.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-404-crisscross-ellipses.english.md
@@ -39,7 +39,7 @@ Find C(1017).
 ```yml
 tests:
   - text: <code>euler404()</code> should return 1199215615081353.
-    testString: 'assert.strictEqual(euler404(), 1199215615081353, "<code>euler404()</code> should return 1199215615081353.");'
+    testString: assert.strictEqual(euler404(), 1199215615081353, '<code>euler404()</code> should return 1199215615081353.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-405-a-rectangular-tiling.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-405-a-rectangular-tiling.english.md
index 45d1c2a3fb..b767a08320 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-405-a-rectangular-tiling.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-405-a-rectangular-tiling.english.md
@@ -41,7 +41,7 @@ Find f(10k) for k = 1018, give your answer modulo 177.
 ```yml
 tests:
   - text: <code>euler405()</code> should return 237696125.
-    testString: 'assert.strictEqual(euler405(), 237696125, "<code>euler405()</code> should return 237696125.");'
+    testString: assert.strictEqual(euler405(), 237696125, '<code>euler405()</code> should return 237696125.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-406-guessing-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-406-guessing-game.english.md
index 07d4704fc3..2b479767d6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-406-guessing-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-406-guessing-game.english.md
@@ -43,7 +43,7 @@ Let Fk be the Fibonacci numbers: Fk = Fk-1 + Fk-2 with base cases F1 = F2 = 1.Fi
 ```yml
 tests:
   - text: <code>euler406()</code> should return 36813.12757207.
-    testString: 'assert.strictEqual(euler406(), 36813.12757207, "<code>euler406()</code> should return 36813.12757207.");'
+    testString: assert.strictEqual(euler406(), 36813.12757207, '<code>euler406()</code> should return 36813.12757207.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-407-idempotents.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-407-idempotents.english.md
index 5fcd57e433..8c0771d38a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-407-idempotents.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-407-idempotents.english.md
@@ -28,7 +28,7 @@ Find ∑M(n) for 1 ≤ n ≤ 107.
 ```yml
 tests:
   - text: <code>euler407()</code> should return 39782849136421.
-    testString: 'assert.strictEqual(euler407(), 39782849136421, "<code>euler407()</code> should return 39782849136421.");'
+    testString: assert.strictEqual(euler407(), 39782849136421, '<code>euler407()</code> should return 39782849136421.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-408-admissible-paths-through-a-grid.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-408-admissible-paths-through-a-grid.english.md
index fce6478c88..017903c551 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-408-admissible-paths-through-a-grid.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-408-admissible-paths-through-a-grid.english.md
@@ -29,7 +29,7 @@ Find P(10 000 000) mod 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler408()</code> should return 299742733.
-    testString: 'assert.strictEqual(euler408(), 299742733, "<code>euler408()</code> should return 299742733.");'
+    testString: assert.strictEqual(euler408(), 299742733, '<code>euler408()</code> should return 299742733.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-409-nim-extreme.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-409-nim-extreme.english.md
index aa73daadd7..648ffafb6a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-409-nim-extreme.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-409-nim-extreme.english.md
@@ -26,7 +26,7 @@ Find W(10 000 000) mod 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler409()</code> should return 253223948.
-    testString: 'assert.strictEqual(euler409(), 253223948, "<code>euler409()</code> should return 253223948.");'
+    testString: assert.strictEqual(euler409(), 253223948, '<code>euler409()</code> should return 253223948.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-41-pandigital-prime.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-41-pandigital-prime.english.md
index 023c0fe7d2..1638f69c65 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-41-pandigital-prime.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-41-pandigital-prime.english.md
@@ -21,9 +21,9 @@ What is the largest <i>n</i>-length digit pandigital prime that exists?
 ```yml
 tests:
   - text: <code>pandigitalPrime(4)</code> should return 4231.
-    testString: 'assert(pandigitalPrime(4) == 4231, "<code>pandigitalPrime(4)</code> should return 4231.");'
+    testString: assert(pandigitalPrime(4) == 4231, '<code>pandigitalPrime(4)</code> should return 4231.');
   - text: <code>pandigitalPrime(7)</code> should return 7652413.
-    testString: 'assert(pandigitalPrime(7) == 7652413, "<code>pandigitalPrime(7)</code> should return 7652413.");'
+    testString: assert(pandigitalPrime(7) == 7652413, '<code>pandigitalPrime(7)</code> should return 7652413.');
 
 ```
 
@@ -88,7 +88,7 @@ function pandigitalPrime(n) {
   let max = 0;
   let permutations = [];
   let digitsArr;
-  let pandigitalNum = ";
+  let pandigitalNum = '';
 
   for (let max = n; max > 0; max--) {
     pandigitalNum += max;
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-410-circle-and-tangent-line.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-410-circle-and-tangent-line.english.md
index cb017361ab..259cd8c4f9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-410-circle-and-tangent-line.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-410-circle-and-tangent-line.english.md
@@ -27,7 +27,7 @@ Find F(108, 109) + F(109, 108).
 ```yml
 tests:
   - text: <code>euler410()</code> should return 799999783589946600.
-    testString: 'assert.strictEqual(euler410(), 799999783589946600, "<code>euler410()</code> should return 799999783589946600.");'
+    testString: assert.strictEqual(euler410(), 799999783589946600, '<code>euler410()</code> should return 799999783589946600.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-411-uphill-paths.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-411-uphill-paths.english.md
index 464274d58b..87807d8cbf 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-411-uphill-paths.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-411-uphill-paths.english.md
@@ -32,7 +32,7 @@ Find ∑ S(k5) for 1 ≤ k ≤ 30.
 ```yml
 tests:
   - text: <code>euler411()</code> should return 9936352.
-    testString: 'assert.strictEqual(euler411(), 9936352, "<code>euler411()</code> should return 9936352.");'
+    testString: assert.strictEqual(euler411(), 9936352, '<code>euler411()</code> should return 9936352.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-412-gnomon-numbering.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-412-gnomon-numbering.english.md
index 26809d3369..d5df2fbecb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-412-gnomon-numbering.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-412-gnomon-numbering.english.md
@@ -34,7 +34,7 @@ Find LC(10000, 5000) mod 76543217.
 ```yml
 tests:
   - text: <code>euler412()</code> should return 38788800.
-    testString: 'assert.strictEqual(euler412(), 38788800, "<code>euler412()</code> should return 38788800.");'
+    testString: assert.strictEqual(euler412(), 38788800, '<code>euler412()</code> should return 38788800.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-413-one-child-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-413-one-child-numbers.english.md
index 8d60aa1e5b..a7938f9e1f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-413-one-child-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-413-one-child-numbers.english.md
@@ -29,7 +29,7 @@ Find F(1019).
 ```yml
 tests:
   - text: <code>euler413()</code> should return 3079418648040719.
-    testString: 'assert.strictEqual(euler413(), 3079418648040719, "<code>euler413()</code> should return 3079418648040719.");'
+    testString: assert.strictEqual(euler413(), 3079418648040719, '<code>euler413()</code> should return 3079418648040719.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-414-kaprekar-constant.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-414-kaprekar-constant.english.md
index 7187df63ee..e4ebd96490 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-414-kaprekar-constant.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-414-kaprekar-constant.english.md
@@ -51,7 +51,7 @@ Give the last 18 digits as your answer.
 ```yml
 tests:
   - text: <code>euler414()</code> should return 552506775824935500.
-    testString: 'assert.strictEqual(euler414(), 552506775824935500, "<code>euler414()</code> should return 552506775824935500.");'
+    testString: assert.strictEqual(euler414(), 552506775824935500, '<code>euler414()</code> should return 552506775824935500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-415-titanic-sets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-415-titanic-sets.english.md
index f795651fb1..829a82c5a7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-415-titanic-sets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-415-titanic-sets.english.md
@@ -29,7 +29,7 @@ Find T(1011) mod 108.
 ```yml
 tests:
   - text: <code>euler415()</code> should return 55859742.
-    testString: 'assert.strictEqual(euler415(), 55859742, "<code>euler415()</code> should return 55859742.");'
+    testString: assert.strictEqual(euler415(), 55859742, '<code>euler415()</code> should return 55859742.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-416-a-frogs-trip.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-416-a-frogs-trip.english.md
index 0d1f707d9a..4d7d06066f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-416-a-frogs-trip.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-416-a-frogs-trip.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f50e1000cf542c510020
 challengeType: 5
-title: 'Problem 416: A frog"s trip'
+title: 'Problem 416: A frog''s trip'
 ---
 
 ## Description
@@ -25,7 +25,7 @@ Find the last 9 digits of F(10, 1012).
 ```yml
 tests:
   - text: <code>euler416()</code> should return 898082747.
-    testString: 'assert.strictEqual(euler416(), 898082747, "<code>euler416()</code> should return 898082747.");'
+    testString: assert.strictEqual(euler416(), 898082747, '<code>euler416()</code> should return 898082747.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-417-reciprocal-cycles-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-417-reciprocal-cycles-ii.english.md
index b6bf9fef06..7d0783da08 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-417-reciprocal-cycles-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-417-reciprocal-cycles-ii.english.md
@@ -42,7 +42,7 @@ Find ∑L(n) for 3 ≤ n ≤ 100 000 000
 ```yml
 tests:
   - text: <code>euler417()</code> should return 446572970925740.
-    testString: 'assert.strictEqual(euler417(), 446572970925740, "<code>euler417()</code> should return 446572970925740.");'
+    testString: assert.strictEqual(euler417(), 446572970925740, '<code>euler417()</code> should return 446572970925740.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-418-factorisation-triples.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-418-factorisation-triples.english.md
index 05ce974392..09179a2226 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-418-factorisation-triples.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-418-factorisation-triples.english.md
@@ -29,7 +29,7 @@ Find f(43!).
 ```yml
 tests:
   - text: <code>euler418()</code> should return 1177163565297340400.
-    testString: 'assert.strictEqual(euler418(), 1177163565297340400, "<code>euler418()</code> should return 1177163565297340400.");'
+    testString: assert.strictEqual(euler418(), 1177163565297340400, '<code>euler418()</code> should return 1177163565297340400.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-419-look-and-say-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-419-look-and-say-sequence.english.md
index a24a603858..8d987a68c9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-419-look-and-say-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-419-look-and-say-sequence.english.md
@@ -36,8 +36,8 @@ E.g. for n = 40 the answer would be 31254,20259,11625
 
 ```yml
 tests:
-  - text: '<code>euler419()</code> should return 998567458, 1046245404, 43363922.'
-    testString: 'assert.strictEqual(euler419(), 998567458, 1046245404, 43363922, "<code>euler419()</code> should return 998567458, 1046245404, 43363922.");'
+  - text: <code>euler419()</code> should return 998567458, 1046245404, 43363922.
+    testString: assert.strictEqual(euler419(), 998567458, 1046245404, 43363922, '<code>euler419()</code> should return 998567458, 1046245404, 43363922.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-42-coded-triangle-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-42-coded-triangle-numbers.english.md
index 36841f6cb8..d45fd7ab27 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-42-coded-triangle-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-42-coded-triangle-numbers.english.md
@@ -23,13 +23,13 @@ Using words array of n-length, how many are triangle words?
 ```yml
 tests:
   - text: <code>codedTriangleNumbers(1400)</code> should return 129.
-    testString: 'assert(codedTriangleNumbers(1400) == 129, "<code>codedTriangleNumbers(1400)</code> should return 129.");'
+    testString: assert(codedTriangleNumbers(1400) == 129, '<code>codedTriangleNumbers(1400)</code> should return 129.');
   - text: <code>codedTriangleNumbers(1500)</code> should return 137.
-    testString: 'assert(codedTriangleNumbers(1500) == 137, "<code>codedTriangleNumbers(1500)</code> should return 137.");'
+    testString: assert(codedTriangleNumbers(1500) == 137, '<code>codedTriangleNumbers(1500)</code> should return 137.');
   - text: <code>codedTriangleNumbers(1600)</code> should return 141.
-    testString: 'assert(codedTriangleNumbers(1600) == 141, "<code>codedTriangleNumbers(1600)</code> should return 141.");'
+    testString: assert(codedTriangleNumbers(1600) == 141, '<code>codedTriangleNumbers(1600)</code> should return 141.');
   - text: <code>codedTriangleNumbers(1786)</code> should return 162.
-    testString: 'assert(codedTriangleNumbers(1786) == 162, "<code>codedTriangleNumbers(1786)</code> should return 162.");'
+    testString: assert(codedTriangleNumbers(1786) == 162, '<code>codedTriangleNumbers(1786)</code> should return 162.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-420-2x2-positive-integer-matrix.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-420-2x2-positive-integer-matrix.english.md
index 6c8378c45b..d2c8bd41e6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-420-2x2-positive-integer-matrix.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-420-2x2-positive-integer-matrix.english.md
@@ -32,7 +32,7 @@ Find F(107).
 ```yml
 tests:
   - text: <code>euler420()</code> should return 145159332.
-    testString: 'assert.strictEqual(euler420(), 145159332, "<code>euler420()</code> should return 145159332.");'
+    testString: assert.strictEqual(euler420(), 145159332, '<code>euler420()</code> should return 145159332.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-421-prime-factors-of-n151.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-421-prime-factors-of-n151.english.md
index 46c96cd62f..c66a737746 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-421-prime-factors-of-n151.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-421-prime-factors-of-n151.english.md
@@ -28,7 +28,7 @@ Find ∑ s(n,108) for 1 ≤ n ≤ 1011.
 ```yml
 tests:
   - text: <code>euler421()</code> should return 2304215802083466200.
-    testString: 'assert.strictEqual(euler421(), 2304215802083466200, "<code>euler421()</code> should return 2304215802083466200.");'
+    testString: assert.strictEqual(euler421(), 2304215802083466200, '<code>euler421()</code> should return 2304215802083466200.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-422-sequence-of-points-on-a-hyperbola.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-422-sequence-of-points-on-a-hyperbola.english.md
index da54ec5885..3fda1d0344 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-422-sequence-of-points-on-a-hyperbola.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-422-sequence-of-points-on-a-hyperbola.english.md
@@ -32,7 +32,7 @@ For n = 7, the answer would have been: 806236837.
 ```yml
 tests:
   - text: <code>euler422()</code> should return 92060460.
-    testString: 'assert.strictEqual(euler422(), 92060460, "<code>euler422()</code> should return 92060460.");'
+    testString: assert.strictEqual(euler422(), 92060460, '<code>euler422()</code> should return 92060460.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-423-consecutive-die-throws.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-423-consecutive-die-throws.english.md
index 6a2fe149ef..c0f8e2d7dc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-423-consecutive-die-throws.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-423-consecutive-die-throws.english.md
@@ -37,7 +37,7 @@ Find S(50 000 000) mod 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler423()</code> should return 653972374.
-    testString: 'assert.strictEqual(euler423(), 653972374, "<code>euler423()</code> should return 653972374.");'
+    testString: assert.strictEqual(euler423(), 653972374, '<code>euler423()</code> should return 653972374.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-424-kakuro.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-424-kakuro.english.md
index 59651a8dab..dbcaa0fd76 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-424-kakuro.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-424-kakuro.english.md
@@ -40,7 +40,7 @@ Find the sum of the answers for the 200 puzzles.
 ```yml
 tests:
   - text: <code>euler424()</code> should return 1059760019628.
-    testString: 'assert.strictEqual(euler424(), 1059760019628, "<code>euler424()</code> should return 1059760019628.");'
+    testString: assert.strictEqual(euler424(), 1059760019628, '<code>euler424()</code> should return 1059760019628.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-425-prime-connection.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-425-prime-connection.english.md
index 0d019363f0..67434e0a6e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-425-prime-connection.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-425-prime-connection.english.md
@@ -37,7 +37,7 @@ Find F(107).
 ```yml
 tests:
   - text: <code>euler425()</code> should return 46479497324.
-    testString: 'assert.strictEqual(euler425(), 46479497324, "<code>euler425()</code> should return 46479497324.");'
+    testString: assert.strictEqual(euler425(), 46479497324, '<code>euler425()</code> should return 46479497324.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-426-box-ball-system.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-426-box-ball-system.english.md
index 3304bebc03..b5c6e6b23a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-426-box-ball-system.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-426-box-ball-system.english.md
@@ -49,7 +49,7 @@ Give as your answer the sum of the squares of the elements of the final state. F
 ```yml
 tests:
   - text: <code>euler426()</code> should return 31591886008.
-    testString: 'assert.strictEqual(euler426(), 31591886008, "<code>euler426()</code> should return 31591886008.");'
+    testString: assert.strictEqual(euler426(), 31591886008, '<code>euler426()</code> should return 31591886008.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-427-n-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-427-n-sequences.english.md
index d9595f5a79..a86acf4c56 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-427-n-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-427-n-sequences.english.md
@@ -30,7 +30,7 @@ Find f(7 500 000) mod 1 000 000 009.
 ```yml
 tests:
   - text: <code>euler427()</code> should return 97138867.
-    testString: 'assert.strictEqual(euler427(), 97138867, "<code>euler427()</code> should return 97138867.");'
+    testString: assert.strictEqual(euler427(), 97138867, '<code>euler427()</code> should return 97138867.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-428-necklace-of-circles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-428-necklace-of-circles.english.md
index 822d767000..d97325f75b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-428-necklace-of-circles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-428-necklace-of-circles.english.md
@@ -33,7 +33,7 @@ Find T(1&nbsp;000&nbsp;000&nbsp;000).
 ```yml
 tests:
   - text: <code>necklace(1000000000)</code> should return 747215561862.
-    testString: 'assert.strictEqual(necklace(1000000000), 747215561862, "<code>necklace(1000000000)</code> should return 747215561862.");'
+    testString: assert.strictEqual(necklace(1000000000), 747215561862, '<code>necklace(1000000000)</code> should return 747215561862.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-429-sum-of-squares-of-unitary-divisors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-429-sum-of-squares-of-unitary-divisors.english.md
index fdd744a147..179c430315 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-429-sum-of-squares-of-unitary-divisors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-429-sum-of-squares-of-unitary-divisors.english.md
@@ -28,7 +28,7 @@ Find S(100 000 000!) modulo 1 000 000 009.
 ```yml
 tests:
   - text: <code>euler429()</code> should return 98792821.
-    testString: 'assert.strictEqual(euler429(), 98792821, "<code>euler429()</code> should return 98792821.");'
+    testString: assert.strictEqual(euler429(), 98792821, '<code>euler429()</code> should return 98792821.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-43-sub-string-divisibility.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-43-sub-string-divisibility.english.md
index 29aa0b88c2..7081fb6bf6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-43-sub-string-divisibility.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-43-sub-string-divisibility.english.md
@@ -28,8 +28,8 @@ Find the numbers of all 0 to 9 pandigital numbers with this property.
 
 ```yml
 tests:
-  - text: '<code>substringDivisibility()</code> should return [ 1430952867, 1460357289, 1406357289, 4130952867, 4160357289, 4106357289 ].'
-    testString: 'assert.deepEqual(substringDivisibility(), [ 1430952867, 1460357289, 1406357289, 4130952867, 4160357289, 4106357289 ], "<code>substringDivisibility()</code> should return [ 1430952867, 1460357289, 1406357289, 4130952867, 4160357289, 4106357289 ].");'
+  - text: <code>substringDivisibility()</code> should return [ 1430952867, 1460357289, 1406357289, 4130952867, 4160357289, 4106357289 ].
+    testString: assert.deepEqual(substringDivisibility(), [ 1430952867, 1460357289, 1406357289, 4130952867, 4160357289, 4106357289 ], '<code>substringDivisibility()</code> should return [ 1430952867, 1460357289, 1406357289, 4130952867, 4160357289, 4106357289 ].');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-430-range-flips.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-430-range-flips.english.md
index 2c1d084f1a..f62b7b1c90 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-430-range-flips.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-430-range-flips.english.md
@@ -34,7 +34,7 @@ Give your answer rounded to 2 decimal places behind the decimal point.
 ```yml
 tests:
   - text: <code>euler430()</code> should return 5000624921.38.
-    testString: 'assert.strictEqual(euler430(), 5000624921.38, "<code>euler430()</code> should return 5000624921.38.");'
+    testString: assert.strictEqual(euler430(), 5000624921.38, '<code>euler430()</code> should return 5000624921.38.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-431-square-space-silo.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-431-square-space-silo.english.md
index 637a95c9c3..5f07891302 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-431-square-space-silo.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-431-square-space-silo.english.md
@@ -31,7 +31,7 @@ If Quick thinking Quentin is to satisfy frustratingly fussy Fred the farmer's ap
 ```yml
 tests:
   - text: <code>euler431()</code> should return 23.386029052.
-    testString: 'assert.strictEqual(euler431(), 23.386029052, "<code>euler431()</code> should return 23.386029052.");'
+    testString: assert.strictEqual(euler431(), 23.386029052, '<code>euler431()</code> should return 23.386029052.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-432-totient-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-432-totient-sum.english.md
index 7ae1f5ac9e..62eed8c4b6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-432-totient-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-432-totient-sum.english.md
@@ -25,7 +25,7 @@ Give the last 9 digits of your answer.
 ```yml
 tests:
   - text: <code>euler432()</code> should return 754862080.
-    testString: 'assert.strictEqual(euler432(), 754862080, "<code>euler432()</code> should return 754862080.");'
+    testString: assert.strictEqual(euler432(), 754862080, '<code>euler432()</code> should return 754862080.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-433-steps-in-euclids-algorithm.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-433-steps-in-euclids-algorithm.english.md
index c345ba6ed4..4a883aac91 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-433-steps-in-euclids-algorithm.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-433-steps-in-euclids-algorithm.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f51d1000cf542c51002f
 challengeType: 5
-title: 'Problem 433: Steps in Euclid"s algorithm'
+title: 'Problem 433: Steps in Euclid''s algorithm'
 ---
 
 ## Description
@@ -31,7 +31,7 @@ Find S(5·106).
 ```yml
 tests:
   - text: <code>euler433()</code> should return 326624372659664.
-    testString: 'assert.strictEqual(euler433(), 326624372659664, "<code>euler433()</code> should return 326624372659664.");'
+    testString: assert.strictEqual(euler433(), 326624372659664, '<code>euler433()</code> should return 326624372659664.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-434-rigid-graphs.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-434-rigid-graphs.english.md
index 35975b5b79..36cb5b3807 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-434-rigid-graphs.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-434-rigid-graphs.english.md
@@ -35,7 +35,7 @@ Find S(100), give your answer modulo 1000000033
 ```yml
 tests:
   - text: <code>euler434()</code> should return 863253606.
-    testString: 'assert.strictEqual(euler434(), 863253606, "<code>euler434()</code> should return 863253606.");'
+    testString: assert.strictEqual(euler434(), 863253606, '<code>euler434()</code> should return 863253606.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-435-polynomials-of-fibonacci-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-435-polynomials-of-fibonacci-numbers.english.md
index 44f9b359d7..ca91f84212 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-435-polynomials-of-fibonacci-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-435-polynomials-of-fibonacci-numbers.english.md
@@ -23,7 +23,7 @@ Let n = 1015. Find the sum [∑0≤x≤100 Fn(x)] mod 1307674368000 (= 15!).
 ```yml
 tests:
   - text: <code>euler435()</code> should return 252541322550.
-    testString: 'assert.strictEqual(euler435(), 252541322550, "<code>euler435()</code> should return 252541322550.");'
+    testString: assert.strictEqual(euler435(), 252541322550, '<code>euler435()</code> should return 252541322550.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-436-unfair-wager.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-436-unfair-wager.english.md
index 52f73fbf3d..1e482afbdc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-436-unfair-wager.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-436-unfair-wager.english.md
@@ -34,7 +34,7 @@ Give your answer rounded to 10 places behind the decimal point in the form 0.abc
 ```yml
 tests:
   - text: <code>euler436()</code> should return 0.5276662759.
-    testString: 'assert.strictEqual(euler436(), 0.5276662759, "<code>euler436()</code> should return 0.5276662759.");'
+    testString: assert.strictEqual(euler436(), 0.5276662759, '<code>euler436()</code> should return 0.5276662759.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-437-fibonacci-primitive-roots.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-437-fibonacci-primitive-roots.english.md
index 3045db4a80..9bb6785681 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-437-fibonacci-primitive-roots.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-437-fibonacci-primitive-roots.english.md
@@ -38,7 +38,7 @@ Find the sum of the primes less than 100,000,000 with at least one Fibonacci pri
 ```yml
 tests:
   - text: <code>euler437()</code> should return 74204709657207.
-    testString: 'assert.strictEqual(euler437(), 74204709657207, "<code>euler437()</code> should return 74204709657207.");'
+    testString: assert.strictEqual(euler437(), 74204709657207, '<code>euler437()</code> should return 74204709657207.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-438-integer-part-of-polynomial-equations-solutions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-438-integer-part-of-polynomial-equations-solutions.english.md
index 3a76b605e0..06b15c7b65 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-438-integer-part-of-polynomial-equations-solutions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-438-integer-part-of-polynomial-equations-solutions.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f5231000cf542c510034
 challengeType: 5
-title: 'Problem 438: Integer part of polynomial equation"s solutions'
+title: 'Problem 438: Integer part of polynomial equation''s solutions'
 ---
 
 ## Description
@@ -32,7 +32,7 @@ Find ∑S(t) for n = 7.
 ```yml
 tests:
   - text: <code>euler438()</code> should return 2046409616809.
-    testString: 'assert.strictEqual(euler438(), 2046409616809, "<code>euler438()</code> should return 2046409616809.");'
+    testString: assert.strictEqual(euler438(), 2046409616809, '<code>euler438()</code> should return 2046409616809.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-439-sum-of-sum-of-divisors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-439-sum-of-sum-of-divisors.english.md
index f7e741804d..99edcdaf42 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-439-sum-of-sum-of-divisors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-439-sum-of-sum-of-divisors.english.md
@@ -25,7 +25,7 @@ Find S(1011) mod 109.
 ```yml
 tests:
   - text: <code>euler439()</code> should return 968697378.
-    testString: 'assert.strictEqual(euler439(), 968697378, "<code>euler439()</code> should return 968697378.");'
+    testString: assert.strictEqual(euler439(), 968697378, '<code>euler439()</code> should return 968697378.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-44-pentagon-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-44-pentagon-numbers.english.md
index d5db372b05..93b2a8d03e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-44-pentagon-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-44-pentagon-numbers.english.md
@@ -23,7 +23,7 @@ Find the pair of pentagonal numbers, P<sub>j</sub> and P<sub>k</sub>, for which
 ```yml
 tests:
   - text: <code>pentagonNumbers()</code> should return 5482660.
-    testString: 'assert.strictEqual(pentagonNumbers(), 5482660, "<code>pentagonNumbers()</code> should return 5482660.");'
+    testString: assert.strictEqual(pentagonNumbers(), 5482660, '<code>pentagonNumbers()</code> should return 5482660.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-440-gcd-and-tiling.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-440-gcd-and-tiling.english.md
index 5c5509eccd..2c1a1dec2b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-440-gcd-and-tiling.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-440-gcd-and-tiling.english.md
@@ -34,7 +34,7 @@ Find S(2000) mod 987 898 789.
 ```yml
 tests:
   - text: <code>euler440()</code> should return 970746056.
-    testString: 'assert.strictEqual(euler440(), 970746056, "<code>euler440()</code> should return 970746056.");'
+    testString: assert.strictEqual(euler440(), 970746056, '<code>euler440()</code> should return 970746056.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-441-the-inverse-summation-of-coprime-couples.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-441-the-inverse-summation-of-coprime-couples.english.md
index 6df6f66f66..4bbfcf4d71 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-441-the-inverse-summation-of-coprime-couples.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-441-the-inverse-summation-of-coprime-couples.english.md
@@ -30,7 +30,7 @@ Find S(107). Give your answer rounded to four decimal places.
 ```yml
 tests:
   - text: <code>euler441()</code> should return 5000088.8395.
-    testString: 'assert.strictEqual(euler441(), 5000088.8395, "<code>euler441()</code> should return 5000088.8395.");'
+    testString: assert.strictEqual(euler441(), 5000088.8395, '<code>euler441()</code> should return 5000088.8395.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-442-eleven-free-integers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-442-eleven-free-integers.english.md
index 823a0e2513..724cbab512 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-442-eleven-free-integers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-442-eleven-free-integers.english.md
@@ -26,7 +26,7 @@ Find E(1018).
 ```yml
 tests:
   - text: <code>euler442()</code> should return 1295552661530920200.
-    testString: 'assert.strictEqual(euler442(), 1295552661530920200, "<code>euler442()</code> should return 1295552661530920200.");'
+    testString: assert.strictEqual(euler442(), 1295552661530920200, '<code>euler442()</code> should return 1295552661530920200.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-443-gcd-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-443-gcd-sequence.english.md
index 253afdcf70..29a857ae7a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-443-gcd-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-443-gcd-sequence.english.md
@@ -32,7 +32,7 @@ Find g(1015).
 ```yml
 tests:
   - text: <code>euler443()</code> should return 2744233049300770.
-    testString: 'assert.strictEqual(euler443(), 2744233049300770, "<code>euler443()</code> should return 2744233049300770.");'
+    testString: assert.strictEqual(euler443(), 2744233049300770, '<code>euler443()</code> should return 2744233049300770.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-444-the-roundtable-lottery.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-444-the-roundtable-lottery.english.md
index 40db2a9e35..8877276239 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-444-the-roundtable-lottery.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-444-the-roundtable-lottery.english.md
@@ -36,7 +36,7 @@ Find S20(1014) and write the answer in scientific notation rounded to 10 signifi
 ```yml
 tests:
   - text: <code>euler444()</code> should return 1.200856722e+263.
-    testString: 'assert.strictEqual(euler444(), 1.200856722e+263, "<code>euler444()</code> should return 1.200856722e+263.");'
+    testString: assert.strictEqual(euler444(), 1.200856722e+263, '<code>euler444()</code> should return 1.200856722e+263.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-445-retractions-a.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-445-retractions-a.english.md
index f8c5a0478e..105778970e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-445-retractions-a.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-445-retractions-a.english.md
@@ -31,7 +31,7 @@ Give your answer modulo 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler445()</code> should return 659104042.
-    testString: 'assert.strictEqual(euler445(), 659104042, "<code>euler445()</code> should return 659104042.");'
+    testString: assert.strictEqual(euler445(), 659104042, '<code>euler445()</code> should return 659104042.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-446-retractions-b.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-446-retractions-b.english.md
index 2741949453..40f2f0fc16 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-446-retractions-b.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-446-retractions-b.english.md
@@ -29,7 +29,7 @@ Find F(107) (mod 1 000 000 007)
 ```yml
 tests:
   - text: <code>euler446()</code> should return 907803852.
-    testString: 'assert.strictEqual(euler446(), 907803852, "<code>euler446()</code> should return 907803852.");'
+    testString: assert.strictEqual(euler446(), 907803852, '<code>euler446()</code> should return 907803852.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-447-retractions-c.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-447-retractions-c.english.md
index 5f9ac3e256..23f425bda4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-447-retractions-c.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-447-retractions-c.english.md
@@ -30,7 +30,7 @@ Find F(1014) (mod 1 000 000 007).
 ```yml
 tests:
   - text: <code>euler447()</code> should return 530553372.
-    testString: 'assert.strictEqual(euler447(), 530553372, "<code>euler447()</code> should return 530553372.");'
+    testString: assert.strictEqual(euler447(), 530553372, '<code>euler447()</code> should return 530553372.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-448-average-least-common-multiple.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-448-average-least-common-multiple.english.md
index 01b1c70702..243f90f307 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-448-average-least-common-multiple.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-448-average-least-common-multiple.english.md
@@ -28,7 +28,7 @@ Find S(99999999019) mod 999999017.
 ```yml
 tests:
   - text: <code>euler448()</code> should return 106467648.
-    testString: 'assert.strictEqual(euler448(), 106467648, "<code>euler448()</code> should return 106467648.");'
+    testString: assert.strictEqual(euler448(), 106467648, '<code>euler448()</code> should return 106467648.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-449-chocolate-covered-candy.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-449-chocolate-covered-candy.english.md
index 0a43a7fdc7..c5b32579b5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-449-chocolate-covered-candy.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-449-chocolate-covered-candy.english.md
@@ -32,7 +32,7 @@ Find the amount of chocolate in mm3 required if a=3 mm and b=1 mm. Give your ans
 ```yml
 tests:
   - text: <code>euler449()</code> should return 103.37870096.
-    testString: 'assert.strictEqual(euler449(), 103.37870096, "<code>euler449()</code> should return 103.37870096.");'
+    testString: assert.strictEqual(euler449(), 103.37870096, '<code>euler449()</code> should return 103.37870096.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-45-triangular-pentagonal-and-hexagonal.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-45-triangular-pentagonal-and-hexagonal.english.md
index 6b3f68f9f3..a5c81dfb32 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-45-triangular-pentagonal-and-hexagonal.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-45-triangular-pentagonal-and-hexagonal.english.md
@@ -25,7 +25,7 @@ Find the next triangle number that is also pentagonal and hexagonal.
 ```yml
 tests:
   - text: <code>triPentaHexa(40756)</code> should return 1533776805.
-    testString: 'assert.strictEqual(triPentaHexa(40756), 1533776805, "<code>triPentaHexa(40756)</code> should return 1533776805.");'
+    testString: assert.strictEqual(triPentaHexa(40756), 1533776805, '<code>triPentaHexa(40756)</code> should return 1533776805.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-450-hypocycloid-and-lattice-points.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-450-hypocycloid-and-lattice-points.english.md
index 12209e42b2..a15b9e02b2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-450-hypocycloid-and-lattice-points.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-450-hypocycloid-and-lattice-points.english.md
@@ -48,7 +48,7 @@ Find T(106).
 ```yml
 tests:
   - text: <code>euler450()</code> should return 583333163984220900.
-    testString: 'assert.strictEqual(euler450(), 583333163984220900, "<code>euler450()</code> should return 583333163984220900.");'
+    testString: assert.strictEqual(euler450(), 583333163984220900, '<code>euler450()</code> should return 583333163984220900.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-451-modular-inverses.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-451-modular-inverses.english.md
index 40b4b96b7a..b5d5ad23ea 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-451-modular-inverses.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-451-modular-inverses.english.md
@@ -35,7 +35,7 @@ Find ∑I(n) for 3≤n≤2·107
 ```yml
 tests:
   - text: <code>euler451()</code> should return 153651073760956.
-    testString: 'assert.strictEqual(euler451(), 153651073760956, "<code>euler451()</code> should return 153651073760956.");'
+    testString: assert.strictEqual(euler451(), 153651073760956, '<code>euler451()</code> should return 153651073760956.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-452-long-products.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-452-long-products.english.md
index 2b6a0842b1..8912e246b8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-452-long-products.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-452-long-products.english.md
@@ -23,7 +23,7 @@ Find F(109, 109) mod 1 234 567 891.
 ```yml
 tests:
   - text: <code>euler452()</code> should return 345558983.
-    testString: 'assert.strictEqual(euler452(), 345558983, "<code>euler452()</code> should return 345558983.");'
+    testString: assert.strictEqual(euler452(), 345558983, '<code>euler452()</code> should return 345558983.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-453-lattice-quadrilaterals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-453-lattice-quadrilaterals.english.md
index 913f75a8a1..9c8cb2ffdb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-453-lattice-quadrilaterals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-453-lattice-quadrilaterals.english.md
@@ -28,7 +28,7 @@ Find Q(12345, 6789) mod 135707531.
 ```yml
 tests:
   - text: <code>euler453()</code> should return 104354107.
-    testString: 'assert.strictEqual(euler453(), 104354107, "<code>euler453()</code> should return 104354107.");'
+    testString: assert.strictEqual(euler453(), 104354107, '<code>euler453()</code> should return 104354107.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-454-diophantine-reciprocals-iii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-454-diophantine-reciprocals-iii.english.md
index 1be6a554ee..ab9903037e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-454-diophantine-reciprocals-iii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-454-diophantine-reciprocals-iii.english.md
@@ -31,7 +31,7 @@ Find F(1012).
 ```yml
 tests:
   - text: <code>euler454()</code> should return 5435004633092.
-    testString: 'assert.strictEqual(euler454(), 5435004633092, "<code>euler454()</code> should return 5435004633092.");'
+    testString: assert.strictEqual(euler454(), 5435004633092, '<code>euler454()</code> should return 5435004633092.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-455-powers-with-trailing-digits.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-455-powers-with-trailing-digits.english.md
index 7d6ee76d77..3a9c26d58e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-455-powers-with-trailing-digits.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-455-powers-with-trailing-digits.english.md
@@ -28,7 +28,7 @@ Find Σf(n), 2 ≤ n ≤ 106.
 ```yml
 tests:
   - text: <code>euler455()</code> should return 450186511399999.
-    testString: 'assert.strictEqual(euler455(), 450186511399999, "<code>euler455()</code> should return 450186511399999.");'
+    testString: assert.strictEqual(euler455(), 450186511399999, '<code>euler455()</code> should return 450186511399999.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-456-triangles-containing-the-origin-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-456-triangles-containing-the-origin-ii.english.md
index 8c4ee752b5..e2bb10d5cb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-456-triangles-containing-the-origin-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-456-triangles-containing-the-origin-ii.english.md
@@ -35,7 +35,7 @@ Find C(2 000 000).
 ```yml
 tests:
   - text: <code>euler456()</code> should return 333333208685971500.
-    testString: 'assert.strictEqual(euler456(), 333333208685971500, "<code>euler456()</code> should return 333333208685971500.");'
+    testString: assert.strictEqual(euler456(), 333333208685971500, '<code>euler456()</code> should return 333333208685971500.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-457-a-polynomial-modulo-the-square-of-a-prime.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-457-a-polynomial-modulo-the-square-of-a-prime.english.md
index f5966ef74e..4a5f867bfe 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-457-a-polynomial-modulo-the-square-of-a-prime.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-457-a-polynomial-modulo-the-square-of-a-prime.english.md
@@ -28,7 +28,7 @@ Find SR(107).
 ```yml
 tests:
   - text: <code>euler457()</code> should return 2647787126797397000.
-    testString: 'assert.strictEqual(euler457(), 2647787126797397000, "<code>euler457()</code> should return 2647787126797397000.");'
+    testString: assert.strictEqual(euler457(), 2647787126797397000, '<code>euler457()</code> should return 2647787126797397000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-458-permutations-of-project.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-458-permutations-of-project.english.md
index 7e9ca73edd..862d7f5d47 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-458-permutations-of-project.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-458-permutations-of-project.english.md
@@ -26,7 +26,7 @@ Find T(1012). Give the last 9 digits of your answer.
 ```yml
 tests:
   - text: <code>euler458()</code> should return 423341841.
-    testString: 'assert.strictEqual(euler458(), 423341841, "<code>euler458()</code> should return 423341841.");'
+    testString: assert.strictEqual(euler458(), 423341841, '<code>euler458()</code> should return 423341841.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-459-flipping-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-459-flipping-game.english.md
index d921316b18..4d4972759d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-459-flipping-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-459-flipping-game.english.md
@@ -40,7 +40,7 @@ Find W(106).
 ```yml
 tests:
   - text: <code>euler459()</code> should return 3996390106631.
-    testString: 'assert.strictEqual(euler459(), 3996390106631, "<code>euler459()</code> should return 3996390106631.");'
+    testString: assert.strictEqual(euler459(), 3996390106631, '<code>euler459()</code> should return 3996390106631.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-46-goldbachs-other-conjecture.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-46-goldbachs-other-conjecture.english.md
index bb0ce70dc9..1b8bc8e8bf 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-46-goldbachs-other-conjecture.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-46-goldbachs-other-conjecture.english.md
@@ -1,7 +1,7 @@
 ---
 id: 5900f39a1000cf542c50fead
 challengeType: 5
-title: 'Problem 46: Goldbach"s other conjecture'
+title: 'Problem 46: Goldbach''s other conjecture'
 ---
 
 ## Description
@@ -28,7 +28,7 @@ What is the smallest odd composite that cannot be written as the sum of a prime
 ```yml
 tests:
   - text: <code>goldbachsOtherConjecture()</code> should return 5777.
-    testString: 'assert.strictEqual(goldbachsOtherConjecture(), 5777, "<code>goldbachsOtherConjecture()</code> should return 5777.");'
+    testString: assert.strictEqual(goldbachsOtherConjecture(), 5777, '<code>goldbachsOtherConjecture()</code> should return 5777.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-460-an-ant-on-the-move.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-460-an-ant-on-the-move.english.md
index 2f18cc2b67..5f28e2b78e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-460-an-ant-on-the-move.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-460-an-ant-on-the-move.english.md
@@ -40,7 +40,7 @@ Find F(10000). Give your answer rounded to nine decimal places.
 ```yml
 tests:
   - text: <code>euler460()</code> should return 18.420738199.
-    testString: 'assert.strictEqual(euler460(), 18.420738199, "<code>euler460()</code> should return 18.420738199.");'
+    testString: assert.strictEqual(euler460(), 18.420738199, '<code>euler460()</code> should return 18.420738199.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-461-almost-pi.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-461-almost-pi.english.md
index ab72c8b89a..b610abacc8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-461-almost-pi.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-461-almost-pi.english.md
@@ -26,7 +26,7 @@ Find g(10000).
 ```yml
 tests:
   - text: <code>euler461()</code> should return 159820276.
-    testString: 'assert.strictEqual(euler461(), 159820276, "<code>euler461()</code> should return 159820276.");'
+    testString: assert.strictEqual(euler461(), 159820276, '<code>euler461()</code> should return 159820276.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-462-permutation-of-3-smooth-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-462-permutation-of-3-smooth-numbers.english.md
index ef3d4a657b..c347536f93 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-462-permutation-of-3-smooth-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-462-permutation-of-3-smooth-numbers.english.md
@@ -34,7 +34,7 @@ When giving your answer, use a lowercase e to separate mantissa and exponent. E.
 ```yml
 tests:
   - text: <code>euler462()</code> should return Infinity.
-    testString: 'assert.strictEqual(euler462(), Infinity, "<code>euler462()</code> should return Infinity.");'
+    testString: assert.strictEqual(euler462(), Infinity, '<code>euler462()</code> should return Infinity.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-463-a-weird-recurrence-relation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-463-a-weird-recurrence-relation.english.md
index 33031aed1b..0067ff138e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-463-a-weird-recurrence-relation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-463-a-weird-recurrence-relation.english.md
@@ -29,7 +29,7 @@ Find $S(3^{37})$. Give the last 9 digits of your answer.
 ```yml
 tests:
   - text: <code>euler463()</code> should return 808981553.
-    testString: 'assert.strictEqual(euler463(), 808981553, "<code>euler463()</code> should return 808981553.");'
+    testString: assert.strictEqual(euler463(), 808981553, '<code>euler463()</code> should return 808981553.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-464-mbius-function-and-intervals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-464-mbius-function-and-intervals.english.md
index 00c82c4d8a..6907eae273 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-464-mbius-function-and-intervals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-464-mbius-function-and-intervals.english.md
@@ -39,7 +39,7 @@ Find C(20 000 000).
 ```yml
 tests:
   - text: <code>euler464()</code> should return 198775297232878.
-    testString: 'assert.strictEqual(euler464(), 198775297232878, "<code>euler464()</code> should return 198775297232878.");'
+    testString: assert.strictEqual(euler464(), 198775297232878, '<code>euler464()</code> should return 198775297232878.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-465-polar-polygons.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-465-polar-polygons.english.md
index 6c3193c609..47890c59fc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-465-polar-polygons.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-465-polar-polygons.english.md
@@ -36,7 +36,7 @@ Find P(713) mod 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler465()</code> should return 585965659.
-    testString: 'assert.strictEqual(euler465(), 585965659, "<code>euler465()</code> should return 585965659.");'
+    testString: assert.strictEqual(euler465(), 585965659, '<code>euler465()</code> should return 585965659.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-466-distinct-terms-in-a-multiplication-table.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-466-distinct-terms-in-a-multiplication-table.english.md
index fa665ed89f..40538b9c6f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-466-distinct-terms-in-a-multiplication-table.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-466-distinct-terms-in-a-multiplication-table.english.md
@@ -35,7 +35,7 @@ Find P(64,1016).
 ```yml
 tests:
   - text: <code>euler466()</code> should return 258381958195474750.
-    testString: 'assert.strictEqual(euler466(), 258381958195474750, "<code>euler466()</code> should return 258381958195474750.");'
+    testString: assert.strictEqual(euler466(), 258381958195474750, '<code>euler466()</code> should return 258381958195474750.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-467-superinteger.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-467-superinteger.english.md
index 7e9cbe1ee9..ede7549964 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-467-superinteger.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-467-superinteger.english.md
@@ -38,7 +38,7 @@ Find f(10 000) mod 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler467()</code> should return 775181359.
-    testString: 'assert.strictEqual(euler467(), 775181359, "<code>euler467()</code> should return 775181359.");'
+    testString: assert.strictEqual(euler467(), 775181359, '<code>euler467()</code> should return 775181359.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-468-smooth-divisors-of-binomial-coefficients.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-468-smooth-divisors-of-binomial-coefficients.english.md
index 8a5e996b8b..769952e962 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-468-smooth-divisors-of-binomial-coefficients.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-468-smooth-divisors-of-binomial-coefficients.english.md
@@ -34,7 +34,7 @@ Find F(11 111 111) mod 1 000 000 993.
 ```yml
 tests:
   - text: <code>euler468()</code> should return 852950321.
-    testString: 'assert.strictEqual(euler468(), 852950321, "<code>euler468()</code> should return 852950321.");'
+    testString: assert.strictEqual(euler468(), 852950321, '<code>euler468()</code> should return 852950321.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-469-empty-chairs.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-469-empty-chairs.english.md
index 839dfa1b1a..2c9fae5307 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-469-empty-chairs.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-469-empty-chairs.english.md
@@ -30,7 +30,7 @@ Find E(1018). Give your answer rounded to fourteen decimal places in the form 0.
 ```yml
 tests:
   - text: <code>euler469()</code> should return 0.56766764161831.
-    testString: 'assert.strictEqual(euler469(), 0.56766764161831, "<code>euler469()</code> should return 0.56766764161831.");'
+    testString: assert.strictEqual(euler469(), 0.56766764161831, '<code>euler469()</code> should return 0.56766764161831.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-47-distinct-primes-factors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-47-distinct-primes-factors.english.md
index 8a0d9904d7..21b5ac1275 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-47-distinct-primes-factors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-47-distinct-primes-factors.english.md
@@ -26,12 +26,12 @@ Find the first four consecutive integers to have four distinct prime factors eac
 
 ```yml
 tests:
-  - text: '<code>distinctPrimeFactors(2, 2)</code> should return 14.'
-    testString: 'assert.strictEqual(distinctPrimeFactors(2, 2), 14, "<code>distinctPrimeFactors(2, 2)</code> should return 14.");'
-  - text: '<code>distinctPrimeFactors(3, 3)</code> should return 644.'
-    testString: 'assert.strictEqual(distinctPrimeFactors(3, 3), 644, "<code>distinctPrimeFactors(3, 3)</code> should return 644.");'
-  - text: '<code>distinctPrimeFactors(4, 4)</code> should return 134043.'
-    testString: 'assert.strictEqual(distinctPrimeFactors(4, 4), 134043, "<code>distinctPrimeFactors(4, 4)</code> should return 134043.");'
+  - text: <code>distinctPrimeFactors(2, 2)</code> should return 14.
+    testString: assert.strictEqual(distinctPrimeFactors(2, 2), 14, '<code>distinctPrimeFactors(2, 2)</code> should return 14.');
+  - text: <code>distinctPrimeFactors(3, 3)</code> should return 644.
+    testString: assert.strictEqual(distinctPrimeFactors(3, 3), 644, '<code>distinctPrimeFactors(3, 3)</code> should return 644.');
+  - text: <code>distinctPrimeFactors(4, 4)</code> should return 134043.
+    testString: assert.strictEqual(distinctPrimeFactors(4, 4), 134043, '<code>distinctPrimeFactors(4, 4)</code> should return 134043.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-470-super-ramvok.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-470-super-ramvok.english.md
index 4a319d46df..d8a844eb4b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-470-super-ramvok.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-470-super-ramvok.english.md
@@ -32,7 +32,7 @@ Calculate F(20), rounded to the nearest integer.
 ```yml
 tests:
   - text: <code>euler470()</code> should return 147668794.
-    testString: 'assert.strictEqual(euler470(), 147668794, "<code>euler470()</code> should return 147668794.");'
+    testString: assert.strictEqual(euler470(), 147668794, '<code>euler470()</code> should return 147668794.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-471-triangle-inscribed-in-ellipse.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-471-triangle-inscribed-in-ellipse.english.md
index c6c81b9b14..f1c1dbfb25 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-471-triangle-inscribed-in-ellipse.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-471-triangle-inscribed-in-ellipse.english.md
@@ -29,7 +29,7 @@ For G(10) the answer would have been 2.059722222e1.
 ```yml
 tests:
   - text: <code>euler471()</code> should return 1.895093981e+31.
-    testString: 'assert.strictEqual(euler471(), 1.895093981e+31, "<code>euler471()</code> should return 1.895093981e+31.");'
+    testString: assert.strictEqual(euler471(), 1.895093981e+31, '<code>euler471()</code> should return 1.895093981e+31.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-472-comfortable-distance-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-472-comfortable-distance-ii.english.md
index 008ed29215..ed91c30ccf 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-472-comfortable-distance-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-472-comfortable-distance-ii.english.md
@@ -37,7 +37,7 @@ Find ∑f(N) for 1 ≤ N ≤ 1012. Give the last 8 digits of your answer.
 ```yml
 tests:
   - text: <code>euler472()</code> should return 73811586.
-    testString: 'assert.strictEqual(euler472(), 73811586, "<code>euler472()</code> should return 73811586.");'
+    testString: assert.strictEqual(euler472(), 73811586, '<code>euler472()</code> should return 73811586.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-473-phigital-number-base.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-473-phigital-number-base.english.md
index 17be0286f8..22bb2e46c6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-473-phigital-number-base.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-473-phigital-number-base.english.md
@@ -37,7 +37,7 @@ Find the sum of the positive integers not exceeding $10^{10}$ whose phigital rep
 ```yml
 tests:
   - text: <code>euler473()</code> should return 35856681704365.
-    testString: 'assert.strictEqual(euler473(), 35856681704365, "<code>euler473()</code> should return 35856681704365.");'
+    testString: assert.strictEqual(euler473(), 35856681704365, '<code>euler473()</code> should return 35856681704365.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-474-last-digits-of-divisors.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-474-last-digits-of-divisors.english.md
index 0bdf095cf9..4355b6e7b5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-474-last-digits-of-divisors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-474-last-digits-of-divisors.english.md
@@ -27,7 +27,7 @@ Find F(106!, 65432) modulo (1016 + 61).
 ```yml
 tests:
   - text: <code>euler474()</code> should return 9690646731515010.
-    testString: 'assert.strictEqual(euler474(), 9690646731515010, "<code>euler474()</code> should return 9690646731515010.");'
+    testString: assert.strictEqual(euler474(), 9690646731515010, '<code>euler474()</code> should return 9690646731515010.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-475-music-festival.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-475-music-festival.english.md
index 8553b4b92a..0d59a9f257 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-475-music-festival.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-475-music-festival.english.md
@@ -27,7 +27,7 @@ Find f(600) mod 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler475()</code> should return 75780067.
-    testString: 'assert.strictEqual(euler475(), 75780067, "<code>euler475()</code> should return 75780067.");'
+    testString: assert.strictEqual(euler475(), 75780067, '<code>euler475()</code> should return 75780067.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-476-circle-packing-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-476-circle-packing-ii.english.md
index 1c46078d85..cd1485d9ce 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-476-circle-packing-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-476-circle-packing-ii.english.md
@@ -23,7 +23,7 @@ Find S(1803) rounded to 5 decimal places behind the decimal point.
 ```yml
 tests:
   - text: <code>euler476()</code> should return 110242.87794.
-    testString: 'assert.strictEqual(euler476(), 110242.87794, "<code>euler476()</code> should return 110242.87794.");'
+    testString: assert.strictEqual(euler476(), 110242.87794, '<code>euler476()</code> should return 110242.87794.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-477-number-sequence-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-477-number-sequence-game.english.md
index 7ce03fcec0..86d05ccc19 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-477-number-sequence-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-477-number-sequence-game.english.md
@@ -34,7 +34,7 @@ Find F(108).
 ```yml
 tests:
   - text: <code>euler477()</code> should return 25044905874565164.
-    testString: 'assert.strictEqual(euler477(), 25044905874565164, "<code>euler477()</code> should return 25044905874565164.");'
+    testString: assert.strictEqual(euler477(), 25044905874565164, '<code>euler477()</code> should return 25044905874565164.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-478-mixtures.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-478-mixtures.english.md
index 202e8a14bf..d2f8d36681 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-478-mixtures.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-478-mixtures.english.md
@@ -40,7 +40,7 @@ Find E(10 000 000) mod 118.
 ```yml
 tests:
   - text: <code>euler478()</code> should return 59510340.
-    testString: 'assert.strictEqual(euler478(), 59510340, "<code>euler478()</code> should return 59510340.");'
+    testString: assert.strictEqual(euler478(), 59510340, '<code>euler478()</code> should return 59510340.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-479-roots-on-the-rise.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-479-roots-on-the-rise.english.md
index e529c84d26..c821656b63 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-479-roots-on-the-rise.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-479-roots-on-the-rise.english.md
@@ -28,7 +28,7 @@ Find S(106) modulo 1 000 000 007.
 ```yml
 tests:
   - text: <code>euler479()</code> should return 191541795.
-    testString: 'assert.strictEqual(euler479(), 191541795, "<code>euler479()</code> should return 191541795.");'
+    testString: assert.strictEqual(euler479(), 191541795, '<code>euler479()</code> should return 191541795.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-48-self-powers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-48-self-powers.english.md
index 73219de6d6..f258821dbf 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-48-self-powers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-48-self-powers.english.md
@@ -20,14 +20,14 @@ Find the last ten digits of the series, 1<sup>1</sup> + 2<sup>2</sup> + 3<sup>3<
 
 ```yml
 tests:
-  - text: '<code>selfPowers(10, 3)</code> should return 317.'
-    testString: 'assert.strictEqual(selfPowers(10, 3), 317, "<code>selfPowers(10, 3)</code> should return 317.");'
-  - text: '<code>selfPowers(150, 6)</code> should return 29045.'
-    testString: 'assert.strictEqual(selfPowers(150, 6), 29045, "<code>selfPowers(150, 6)</code> should return 29045.");'
-  - text: '<code>selfPowers(673, 7)</code> should return 2473989.'
-    testString: 'assert.strictEqual(selfPowers(673, 7), 2473989, "<code>selfPowers(673, 7)</code> should return 2473989.");'
-  - text: '<code>selfPowers(1000, 10)</code> should return 9110846700.'
-    testString: 'assert.strictEqual(selfPowers(1000, 10), 9110846700, "<code>selfPowers(1000, 10)</code> should return 9110846700.");'
+  - text: <code>selfPowers(10, 3)</code> should return 317.
+    testString: assert.strictEqual(selfPowers(10, 3), 317, '<code>selfPowers(10, 3)</code> should return 317.');
+  - text: <code>selfPowers(150, 6)</code> should return 29045.
+    testString: assert.strictEqual(selfPowers(150, 6), 29045, '<code>selfPowers(150, 6)</code> should return 29045.');
+  - text: <code>selfPowers(673, 7)</code> should return 2473989.
+    testString: assert.strictEqual(selfPowers(673, 7), 2473989, '<code>selfPowers(673, 7)</code> should return 2473989.');
+  - text: <code>selfPowers(1000, 10)</code> should return 9110846700.
+    testString: assert.strictEqual(selfPowers(1000, 10), 9110846700, '<code>selfPowers(1000, 10)</code> should return 9110846700.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-480-the-last-question.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-480-the-last-question.english.md
index f403127d5c..bfbb2bf58f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-480-the-last-question.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-480-the-last-question.english.md
@@ -58,7 +58,7 @@ Give your answer using lowercase characters (no punctuation or space).
 ```yml
 tests:
   - text: <code>euler480()</code> should return turnthestarson.
-    testString: 'assert.strictEqual(euler480(), turnthestarson, "<code>euler480()</code> should return turnthestarson.");'
+    testString: assert.strictEqual(euler480(), turnthestarson, '<code>euler480()</code> should return turnthestarson.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-49-prime-permutations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-49-prime-permutations.english.md
index 9f8a32ed6b..42440cbdee 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-49-prime-permutations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-49-prime-permutations.english.md
@@ -22,7 +22,7 @@ What 12-digit number do you form by concatenating the three terms in this sequen
 ```yml
 tests:
   - text: <code>primePermutations()</code> should return 296962999629.
-    testString: 'assert.strictEqual(primePermutations(), 296962999629, "<code>primePermutations()</code> should return 296962999629.");'
+    testString: assert.strictEqual(primePermutations(), 296962999629, '<code>primePermutations()</code> should return 296962999629.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-5-smallest-multiple.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-5-smallest-multiple.english.md
index 9b4472c767..b2afb36dda 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-5-smallest-multiple.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-5-smallest-multiple.english.md
@@ -21,15 +21,15 @@ What is the smallest positive number that is evenly divisible by all of the numb
 ```yml
 tests:
   - text: <code>smallestMult(5)</code> should return 60.
-    testString: 'assert.strictEqual(smallestMult(5), 60, "<code>smallestMult(5)</code> should return 60.");'
+    testString: assert.strictEqual(smallestMult(5), 60, '<code>smallestMult(5)</code> should return 60.');
   - text: <code>smallestMult(7)</code> should return 420.
-    testString: 'assert.strictEqual(smallestMult(7), 420, "<code>smallestMult(7)</code> should return 420.");'
+    testString: assert.strictEqual(smallestMult(7), 420, '<code>smallestMult(7)</code> should return 420.');
   - text: <code>smallestMult(10)</code> should return 2520.
-    testString: 'assert.strictEqual(smallestMult(10), 2520, "<code>smallestMult(10)</code> should return 2520.");'
+    testString: assert.strictEqual(smallestMult(10), 2520, '<code>smallestMult(10)</code> should return 2520.');
   - text: <code>smallestMult(13)</code> should return 360360.
-    testString: 'assert.strictEqual(smallestMult(13), 360360, "<code>smallestMult(13)</code> should return 360360.");'
+    testString: assert.strictEqual(smallestMult(13), 360360, '<code>smallestMult(13)</code> should return 360360.');
   - text: <code>smallestMult(20)</code> should return 232792560.
-    testString: 'assert.strictEqual(smallestMult(20), 232792560, "<code>smallestMult(20)</code> should return 232792560.");'
+    testString: assert.strictEqual(smallestMult(20), 232792560, '<code>smallestMult(20)</code> should return 232792560.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-50-consecutive-prime-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-50-consecutive-prime-sum.english.md
index 3417f6cf3e..09fc3cfb24 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-50-consecutive-prime-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-50-consecutive-prime-sum.english.md
@@ -24,9 +24,9 @@ Which prime, below one-million, can be written as the sum of the most consecutiv
 ```yml
 tests:
   - text: <code>consecutivePrimeSum(1000)</code> should return 953.
-    testString: 'assert.strictEqual(consecutivePrimeSum(1000), 953, "<code>consecutivePrimeSum(1000)</code> should return 953.");'
+    testString: assert.strictEqual(consecutivePrimeSum(1000), 953, '<code>consecutivePrimeSum(1000)</code> should return 953.');
   - text: <code>consecutivePrimeSum(1000000)</code> should return 997651.
-    testString: 'assert.strictEqual(consecutivePrimeSum(1000000), 997651, "<code>consecutivePrimeSum(1000000)</code> should return 997651.");'
+    testString: assert.strictEqual(consecutivePrimeSum(1000000), 997651, '<code>consecutivePrimeSum(1000000)</code> should return 997651.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-51-prime-digit-replacements.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-51-prime-digit-replacements.english.md
index fc2336d3b3..dd22b84bfc 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-51-prime-digit-replacements.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-51-prime-digit-replacements.english.md
@@ -22,7 +22,7 @@ Find the smallest prime which, by replacing part of the number (not necessarily
 ```yml
 tests:
   - text: <code>euler51()</code> should return 121313.
-    testString: 'assert.strictEqual(euler51(), 121313, "<code>euler51()</code> should return 121313.");'
+    testString: assert.strictEqual(euler51(), 121313, '<code>euler51()</code> should return 121313.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-52-permuted-multiples.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-52-permuted-multiples.english.md
index 50450a32f9..704283c032 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-52-permuted-multiples.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-52-permuted-multiples.english.md
@@ -21,7 +21,7 @@ Find the smallest positive integer, x, such that 2x, 3x, 4x, 5x, and 6x, contain
 ```yml
 tests:
   - text: <code>permutedMultiples()</code> should return 142857.
-    testString: 'assert.strictEqual(permutedMultiples(), 142857, "<code>permutedMultiples()</code> should return 142857.");'
+    testString: assert.strictEqual(permutedMultiples(), 142857, '<code>permutedMultiples()</code> should return 142857.');
 
 ```
 
@@ -68,7 +68,7 @@ function permutedMultiples() {
         for (let i = start; i < start * 10 / 6; i++) {
             found = true;
             for (let j = 2; j <= 6; j++) {
-                if (!isPermutation(i + ", j * i + ")) {
+                if (!isPermutation(i + '', j * i + '')) {
                     found = false;
                     break;
                 }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-53-combinatoric-selections.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-53-combinatoric-selections.english.md
index fb8f92ce33..da3976cde8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-53-combinatoric-selections.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-53-combinatoric-selections.english.md
@@ -30,13 +30,13 @@ How many, not necessarily distinct, values of  nCr, for 1 ≤ n ≤ 100, are gr
 ```yml
 tests:
   - text: <code>combinatoricSelections(1000)</code> should return 4626.
-    testString: 'assert.strictEqual(combinatoricSelections(1000), 4626, "<code>combinatoricSelections(1000)</code> should return 4626.");'
+    testString: assert.strictEqual(combinatoricSelections(1000), 4626, '<code>combinatoricSelections(1000)</code> should return 4626.');
   - text: <code>combinatoricSelections(10000)</code> should return 4431.
-    testString: 'assert.strictEqual(combinatoricSelections(10000), 4431, "<code>combinatoricSelections(10000)</code> should return 4431.");'
+    testString: assert.strictEqual(combinatoricSelections(10000), 4431, '<code>combinatoricSelections(10000)</code> should return 4431.');
   - text: <code>combinatoricSelections(100000)</code> should return 4255.
-    testString: 'assert.strictEqual(combinatoricSelections(100000), 4255, "<code>combinatoricSelections(100000)</code> should return 4255.");'
+    testString: assert.strictEqual(combinatoricSelections(100000), 4255, '<code>combinatoricSelections(100000)</code> should return 4255.');
   - text: <code>combinatoricSelections(1000000)</code> should return 4075.
-    testString: 'assert.strictEqual(combinatoricSelections(1000000), 4075, "<code>combinatoricSelections(1000000)</code> should return 4075.");'
+    testString: assert.strictEqual(combinatoricSelections(1000000), 4075, '<code>combinatoricSelections(1000000)</code> should return 4075.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-54-poker-hands.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-54-poker-hands.english.md
index 5994b0ee1f..e2df887e76 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-54-poker-hands.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-54-poker-hands.english.md
@@ -43,7 +43,7 @@ How many hands does Player 1 win?
 ```yml
 tests:
   - text: <code>euler54()</code> should return 376.
-    testString: 'assert.strictEqual(euler54(), 376, "<code>euler54()</code> should return 376.");'
+    testString: assert.strictEqual(euler54(), 376, '<code>euler54()</code> should return 376.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-55-lychrel-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-55-lychrel-numbers.english.md
index 9dceee5a79..8e22eaf514 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-55-lychrel-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-55-lychrel-numbers.english.md
@@ -29,15 +29,15 @@ NOTE: Wording was modified slightly on 24 April 2007 to emphasise the theoretica
 ```yml
 tests:
   - text: <code>countLychrelNumbers(1000)</code> should return 13.
-    testString: 'assert.strictEqual(countLychrelNumbers(1000), 13, "<code>countLychrelNumbers(1000)</code> should return 13.");'
+    testString: assert.strictEqual(countLychrelNumbers(1000), 13, '<code>countLychrelNumbers(1000)</code> should return 13.');
   - text: <code>countLychrelNumbers(5000)</code> should return 76.
-    testString: 'assert.strictEqual(countLychrelNumbers(5000), 76, "<code>countLychrelNumbers(5000)</code> should return 76.");'
+    testString: assert.strictEqual(countLychrelNumbers(5000), 76, '<code>countLychrelNumbers(5000)</code> should return 76.');
   - text: <code>countLychrelNumbers(10000)</code> should return 249.
-    testString: 'assert.strictEqual(countLychrelNumbers(10000), 249, "<code>countLychrelNumbers(10000)</code> should return 249.");'
+    testString: assert.strictEqual(countLychrelNumbers(10000), 249, '<code>countLychrelNumbers(10000)</code> should return 249.');
   - text: Your function should count all Lychrel numbers.
-    testString: 'assert.strictEqual(countLychrelNumbers(3243), 39, "Your function should count all Lychrel numbers.");'
+    testString: assert.strictEqual(countLychrelNumbers(3243), 39, 'Your function should count all Lychrel numbers.');
   - text: Your function should pass all test cases.
-    testString: 'assert.strictEqual(countLychrelNumbers(7654), 140, "Your function should pass all test cases.");'
+    testString: assert.strictEqual(countLychrelNumbers(7654), 140, 'Your function should pass all test cases.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-56-powerful-digit-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-56-powerful-digit-sum.english.md
index a2edb1be87..7d759cf326 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-56-powerful-digit-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-56-powerful-digit-sum.english.md
@@ -21,7 +21,7 @@ Considering natural numbers of the form, ab, where a, b < 100, what is the maxim
 ```yml
 tests:
   - text: <code>euler56()</code> should return 972.
-    testString: 'assert.strictEqual(euler56(), 972, "<code>euler56()</code> should return 972.");'
+    testString: assert.strictEqual(euler56(), 972, '<code>euler56()</code> should return 972.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-57-square-root-convergents.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-57-square-root-convergents.english.md
index 5ddb0613ef..850380a4ff 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-57-square-root-convergents.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-57-square-root-convergents.english.md
@@ -28,7 +28,7 @@ In the first one-thousand expansions, how many fractions contain a numerator wit
 ```yml
 tests:
   - text: <code>euler57()</code> should return 153.
-    testString: 'assert.strictEqual(euler57(), 153, "<code>euler57()</code> should return 153.");'
+    testString: assert.strictEqual(euler57(), 153, '<code>euler57()</code> should return 153.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-58-spiral-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-58-spiral-primes.english.md
index d6bce0772f..bb96fac9d4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-58-spiral-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-58-spiral-primes.english.md
@@ -28,7 +28,7 @@ If one complete new layer is wrapped around the spiral above, a square spiral wi
 ```yml
 tests:
   - text: <code>euler58()</code> should return 26241.
-    testString: 'assert.strictEqual(euler58(), 26241, "<code>euler58()</code> should return 26241.");'
+    testString: assert.strictEqual(euler58(), 26241, '<code>euler58()</code> should return 26241.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-59-xor-decryption.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-59-xor-decryption.english.md
index e2e8cebd77..aac95b273c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-59-xor-decryption.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-59-xor-decryption.english.md
@@ -24,7 +24,7 @@ Your task has been made easy, as the encryption key consists of three lower case
 ```yml
 tests:
   - text: <code>euler59()</code> should return 107359.
-    testString: 'assert.strictEqual(euler59(), 107359, "<code>euler59()</code> should return 107359.");'
+    testString: assert.strictEqual(euler59(), 107359, '<code>euler59()</code> should return 107359.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-6-sum-square-difference.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-6-sum-square-difference.english.md
index 1a6f25d7b8..96d774a826 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-6-sum-square-difference.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-6-sum-square-difference.english.md
@@ -25,11 +25,11 @@ Find the difference between the sum of the squares of the first <code>n</code> n
 ```yml
 tests:
   - text: <code>sumSquareDifference(10)</code> should return 2640.
-    testString: 'assert.strictEqual(sumSquareDifference(10), 2640, "<code>sumSquareDifference(10)</code> should return 2640.");'
+    testString: assert.strictEqual(sumSquareDifference(10), 2640, '<code>sumSquareDifference(10)</code> should return 2640.');
   - text: <code>sumSquareDifference(20)</code> should return 41230.
-    testString: 'assert.strictEqual(sumSquareDifference(20), 41230, "<code>sumSquareDifference(20)</code> should return 41230.");'
+    testString: assert.strictEqual(sumSquareDifference(20), 41230, '<code>sumSquareDifference(20)</code> should return 41230.');
   - text: <code>sumSquareDifference(100)</code> should return 25164150.
-    testString: 'assert.strictEqual(sumSquareDifference(100), 25164150, "<code>sumSquareDifference(100)</code> should return 25164150.");'
+    testString: assert.strictEqual(sumSquareDifference(100), 25164150, '<code>sumSquareDifference(100)</code> should return 25164150.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-60-prime-pair-sets.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-60-prime-pair-sets.english.md
index 1a5235bc88..1e7a1041ce 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-60-prime-pair-sets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-60-prime-pair-sets.english.md
@@ -21,7 +21,7 @@ Find the lowest sum for a set of five primes for which any two primes concatenat
 ```yml
 tests:
   - text: <code>euler60()</code> should return 26033.
-    testString: 'assert.strictEqual(euler60(), 26033, "<code>euler60()</code> should return 26033.");'
+    testString: assert.strictEqual(euler60(), 26033, '<code>euler60()</code> should return 26033.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-61-cyclical-figurate-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-61-cyclical-figurate-numbers.english.md
index b5a9237137..7492e91ca0 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-61-cyclical-figurate-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-61-cyclical-figurate-numbers.english.md
@@ -55,7 +55,7 @@ Find the sum of the only ordered set of six cyclic 4-digit numbers for which eac
 ```yml
 tests:
   - text: <code>euler61()</code> should return 28684.
-    testString: 'assert.strictEqual(euler61(), 28684, "<code>euler61()</code> should return 28684.");'
+    testString: assert.strictEqual(euler61(), 28684, '<code>euler61()</code> should return 28684.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-62-cubic-permutations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-62-cubic-permutations.english.md
index 449d57a719..7b5c10e7d6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-62-cubic-permutations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-62-cubic-permutations.english.md
@@ -21,7 +21,7 @@ Find the smallest cube for which exactly five permutations of its digits are cub
 ```yml
 tests:
   - text: <code>euler62()</code> should return 127035954683.
-    testString: 'assert.strictEqual(euler62(), 127035954683, "<code>euler62()</code> should return 127035954683.");'
+    testString: assert.strictEqual(euler62(), 127035954683, '<code>euler62()</code> should return 127035954683.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-63-powerful-digit-counts.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-63-powerful-digit-counts.english.md
index 5529a9bf30..b97870a46d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-63-powerful-digit-counts.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-63-powerful-digit-counts.english.md
@@ -21,7 +21,7 @@ How many n-digit positive integers exist which are also an nth power?
 ```yml
 tests:
   - text: <code>euler63()</code> should return 49.
-    testString: 'assert.strictEqual(euler63(), 49, "<code>euler63()</code> should return 49.");'
+    testString: assert.strictEqual(euler63(), 49, '<code>euler63()</code> should return 49.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-64-odd-period-square-roots.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-64-odd-period-square-roots.english.md
index 36d1ca7db1..ce7453b251 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-64-odd-period-square-roots.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-64-odd-period-square-roots.english.md
@@ -143,7 +143,7 @@ How many continued fractions for N ≤ 10000 have an odd period?
 ```yml
 tests:
   - text: <code>euler64()</code> should return 1322.
-    testString: 'assert.strictEqual(euler64(), 1322, "<code>euler64()</code> should return 1322.");'
+    testString: assert.strictEqual(euler64(), 1322, '<code>euler64()</code> should return 1322.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-65-convergents-of-e.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-65-convergents-of-e.english.md
index 42c9742b82..9a981b454c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-65-convergents-of-e.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-65-convergents-of-e.english.md
@@ -109,7 +109,7 @@ Find the sum of digits in the numerator of the 100th convergent of the continued
 ```yml
 tests:
   - text: <code>euler65()</code> should return 272.
-    testString: 'assert.strictEqual(euler65(), 272, "<code>euler65()</code> should return 272.");'
+    testString: assert.strictEqual(euler65(), 272, '<code>euler65()</code> should return 272.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-66-diophantine-equation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-66-diophantine-equation.english.md
index 8155e34f86..16981d85ee 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-66-diophantine-equation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-66-diophantine-equation.english.md
@@ -30,7 +30,7 @@ Find the value of D ≤ 1000 in minimal solutions of x for which the largest val
 ```yml
 tests:
   - text: <code>euler66()</code> should return 661.
-    testString: 'assert.strictEqual(euler66(), 661, "<code>euler66()</code> should return 661.");'
+    testString: assert.strictEqual(euler66(), 661, '<code>euler66()</code> should return 661.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-67-maximum-path-sum-ii.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-67-maximum-path-sum-ii.english.md
index a7373f4b8f..182089cf25 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-67-maximum-path-sum-ii.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-67-maximum-path-sum-ii.english.md
@@ -26,7 +26,7 @@ NOTE: This is a much more difficult version of Problem 18. It is not possible to
 ```yml
 tests:
   - text: <code>euler67()</code> should return 7273.
-    testString: 'assert.strictEqual(euler67(), 7273, "<code>euler67()</code> should return 7273.");'
+    testString: assert.strictEqual(euler67(), 7273, '<code>euler67()</code> should return 7273.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-68-magic-5-gon-ring.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-68-magic-5-gon-ring.english.md
index 716c008407..3cb521bb25 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-68-magic-5-gon-ring.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-68-magic-5-gon-ring.english.md
@@ -37,7 +37,7 @@ Using the numbers 1 to 10, and depending on arrangements, it is possible to form
 ```yml
 tests:
   - text: <code>euler68()</code> should return 6531031914842725.
-    testString: 'assert.strictEqual(euler68(), 6531031914842725, "<code>euler68()</code> should return 6531031914842725.");'
+    testString: assert.strictEqual(euler68(), 6531031914842725, '<code>euler68()</code> should return 6531031914842725.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-69-totient-maximum.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-69-totient-maximum.english.md
index 9389fe54f5..d77a95faf2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-69-totient-maximum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-69-totient-maximum.english.md
@@ -64,7 +64,7 @@ Find the value of n ≤ 1,000,000 for which n/φ(n) is a maximum.
 ```yml
 tests:
   - text: <code>euler69()</code> should return 510510.
-    testString: 'assert.strictEqual(euler69(), 510510, "<code>euler69()</code> should return 510510.");'
+    testString: assert.strictEqual(euler69(), 510510, '<code>euler69()</code> should return 510510.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-7-10001st-prime.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-7-10001st-prime.english.md
index ab57c05253..5a08ae5645 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-7-10001st-prime.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-7-10001st-prime.english.md
@@ -21,15 +21,15 @@ What is the <code>n</code>th prime number?
 ```yml
 tests:
   - text: <code>nthPrime(6)</code> should return 13.
-    testString: 'assert.strictEqual(nthPrime(6), 13, "<code>nthPrime(6)</code> should return 13.");'
+    testString: assert.strictEqual(nthPrime(6), 13, '<code>nthPrime(6)</code> should return 13.');
   - text: <code>nthPrime(10)</code> should return 29.
-    testString: 'assert.strictEqual(nthPrime(10), 29, "<code>nthPrime(10)</code> should return 29.");'
+    testString: assert.strictEqual(nthPrime(10), 29, '<code>nthPrime(10)</code> should return 29.');
   - text: <code>nthPrime(100)</code> should return 541.
-    testString: 'assert.strictEqual(nthPrime(100), 541, "<code>nthPrime(100)</code> should return 541.");'
+    testString: assert.strictEqual(nthPrime(100), 541, '<code>nthPrime(100)</code> should return 541.');
   - text: <code>nthPrime(1000)</code> should return 7919.
-    testString: 'assert.strictEqual(nthPrime(1000), 7919, "<code>nthPrime(1000)</code> should return 7919.");'
+    testString: assert.strictEqual(nthPrime(1000), 7919, '<code>nthPrime(1000)</code> should return 7919.');
   - text: <code>nthPrime(10001)</code> should return 104743.
-    testString: 'assert.strictEqual(nthPrime(10001), 104743, "<code>nthPrime(10001)</code> should return 104743.");'
+    testString: assert.strictEqual(nthPrime(10001), 104743, '<code>nthPrime(10001)</code> should return 104743.');
 
 ```
 
@@ -71,7 +71,7 @@ const nthPrime = (number)=>{
         break;
       }
    }
-   isPrime ? step++ : ";
+   isPrime ? step++ : '';
     pN++;
  }
  return pN-1;
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-70-totient-permutation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-70-totient-permutation.english.md
index 843bac9186..d0a399e128 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-70-totient-permutation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-70-totient-permutation.english.md
@@ -22,7 +22,7 @@ Find the value of n, 1 < n < 107, for which φ(n) is a permutation of n and the
 ```yml
 tests:
   - text: <code>euler70()</code> should return 8319823.
-    testString: 'assert.strictEqual(euler70(), 8319823, "<code>euler70()</code> should return 8319823.");'
+    testString: assert.strictEqual(euler70(), 8319823, '<code>euler70()</code> should return 8319823.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-71-ordered-fractions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-71-ordered-fractions.english.md
index 118b5ab44a..2df9cd5f33 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-71-ordered-fractions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-71-ordered-fractions.english.md
@@ -24,7 +24,7 @@ By listing the set of reduced proper fractions for d ≤ 1,000,000 in ascending
 ```yml
 tests:
   - text: <code>euler71()</code> should return 428570.
-    testString: 'assert.strictEqual(euler71(), 428570, "<code>euler71()</code> should return 428570.");'
+    testString: assert.strictEqual(euler71(), 428570, '<code>euler71()</code> should return 428570.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-72-counting-fractions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-72-counting-fractions.english.md
index 1dbb451e47..dfa683e514 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-72-counting-fractions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-72-counting-fractions.english.md
@@ -24,7 +24,7 @@ How many elements would be contained in the set of reduced proper fractions for
 ```yml
 tests:
   - text: <code>euler72()</code> should return 303963552391.
-    testString: 'assert.strictEqual(euler72(), 303963552391, "<code>euler72()</code> should return 303963552391.");'
+    testString: assert.strictEqual(euler72(), 303963552391, '<code>euler72()</code> should return 303963552391.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-73-counting-fractions-in-a-range.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-73-counting-fractions-in-a-range.english.md
index fae5016d1f..81a15f6227 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-73-counting-fractions-in-a-range.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-73-counting-fractions-in-a-range.english.md
@@ -24,7 +24,7 @@ How many fractions lie between 1/3 and 1/2 in the sorted set of reduced proper f
 ```yml
 tests:
   - text: <code>euler73()</code> should return 7295372.
-    testString: 'assert.strictEqual(euler73(), 7295372, "<code>euler73()</code> should return 7295372.");'
+    testString: assert.strictEqual(euler73(), 7295372, '<code>euler73()</code> should return 7295372.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-74-digit-factorial-chains.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-74-digit-factorial-chains.english.md
index 2b183f74dd..2c90092086 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-74-digit-factorial-chains.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-74-digit-factorial-chains.english.md
@@ -31,7 +31,7 @@ How many chains, with a starting number below one million, contain exactly sixty
 ```yml
 tests:
   - text: <code>euler74()</code> should return 402.
-    testString: 'assert.strictEqual(euler74(), 402, "<code>euler74()</code> should return 402.");'
+    testString: assert.strictEqual(euler74(), 402, '<code>euler74()</code> should return 402.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-75-singular-integer-right-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-75-singular-integer-right-triangles.english.md
index e7d56bd059..9888a8212d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-75-singular-integer-right-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-75-singular-integer-right-triangles.english.md
@@ -24,7 +24,7 @@ Given that L is the length of the wire, for how many values of L ≤ 1,500,000 c
 ```yml
 tests:
   - text: <code>euler75()</code> should return 161667.
-    testString: 'assert.strictEqual(euler75(), 161667, "<code>euler75()</code> should return 161667.");'
+    testString: assert.strictEqual(euler75(), 161667, '<code>euler75()</code> should return 161667.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-76-counting-summations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-76-counting-summations.english.md
index 9be879e18f..a0bb4bc9d2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-76-counting-summations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-76-counting-summations.english.md
@@ -27,7 +27,7 @@ How many different ways can one hundred be written as a sum of at least two posi
 ```yml
 tests:
   - text: <code>euler76()</code> should return 190569291.
-    testString: 'assert.strictEqual(euler76(), 190569291, "<code>euler76()</code> should return 190569291.");'
+    testString: assert.strictEqual(euler76(), 190569291, '<code>euler76()</code> should return 190569291.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-77-prime-summations.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-77-prime-summations.english.md
index 374956ef13..a826ae483b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-77-prime-summations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-77-prime-summations.english.md
@@ -26,7 +26,7 @@ What is the first value which can be written as the sum of primes in over five t
 ```yml
 tests:
   - text: <code>euler77()</code> should return 71.
-    testString: 'assert.strictEqual(euler77(), 71, "<code>euler77()</code> should return 71.");'
+    testString: assert.strictEqual(euler77(), 71, '<code>euler77()</code> should return 71.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-78-coin-partitions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-78-coin-partitions.english.md
index a219285dd4..590a9bb145 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-78-coin-partitions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-78-coin-partitions.english.md
@@ -30,7 +30,7 @@ Find the least value of n for which p(n) is divisible by one million.
 ```yml
 tests:
   - text: <code>euler78()</code> should return 55374.
-    testString: 'assert.strictEqual(euler78(), 55374, "<code>euler78()</code> should return 55374.");'
+    testString: assert.strictEqual(euler78(), 55374, '<code>euler78()</code> should return 55374.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-79-passcode-derivation.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-79-passcode-derivation.english.md
index 31d0ab45d0..b366f48077 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-79-passcode-derivation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-79-passcode-derivation.english.md
@@ -22,7 +22,7 @@ Given that the three characters are always asked for in order, analyse the file
 ```yml
 tests:
   - text: <code>euler79()</code> should return 73162890.
-    testString: 'assert.strictEqual(euler79(), 73162890, "<code>euler79()</code> should return 73162890.");'
+    testString: assert.strictEqual(euler79(), 73162890, '<code>euler79()</code> should return 73162890.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-8-largest-product-in-a-series.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-8-largest-product-in-a-series.english.md
index 60391ed1c7..1ffd24dfd3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-8-largest-product-in-a-series.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-8-largest-product-in-a-series.english.md
@@ -42,9 +42,9 @@ Find the <code>n</code> adjacent digits in the 1000-digit number that have the g
 ```yml
 tests:
   - text: <code>largestProductinaSeries(4)</code> should return 5832.
-    testString: 'assert.strictEqual(largestProductinaSeries(4), 5832, "<code>largestProductinaSeries(4)</code> should return 5832.");'
+    testString: assert.strictEqual(largestProductinaSeries(4), 5832, '<code>largestProductinaSeries(4)</code> should return 5832.');
   - text: <code>largestProductinaSeries(13)</code> should return 23514624000.
-    testString: 'assert.strictEqual(largestProductinaSeries(13), 23514624000, "<code>largestProductinaSeries(13)</code> should return 23514624000.");'
+    testString: assert.strictEqual(largestProductinaSeries(13), 23514624000, '<code>largestProductinaSeries(13)</code> should return 23514624000.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-80-square-root-digital-expansion.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-80-square-root-digital-expansion.english.md
index 5da6dd6731..ce0110c5e2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-80-square-root-digital-expansion.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-80-square-root-digital-expansion.english.md
@@ -22,7 +22,7 @@ For the first one hundred natural numbers, find the total of the digital sums of
 ```yml
 tests:
   - text: <code>euler80()</code> should return 40886.
-    testString: 'assert.strictEqual(euler80(), 40886, "<code>euler80()</code> should return 40886.");'
+    testString: assert.strictEqual(euler80(), 40886, '<code>euler80()</code> should return 40886.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-81-path-sum-two-ways.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-81-path-sum-two-ways.english.md
index 00506d957b..3f587cbb06 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-81-path-sum-two-ways.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-81-path-sum-two-ways.english.md
@@ -32,7 +32,7 @@ Find the minimal path sum, in matrix.txt (right click and "Save Link/Target As..
 ```yml
 tests:
   - text: <code>euler81()</code> should return 427337.
-    testString: 'assert.strictEqual(euler81(), 427337, "<code>euler81()</code> should return 427337.");'
+    testString: assert.strictEqual(euler81(), 427337, '<code>euler81()</code> should return 427337.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-82-path-sum-three-ways.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-82-path-sum-three-ways.english.md
index d8b018f979..aa0b232500 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-82-path-sum-three-ways.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-82-path-sum-three-ways.english.md
@@ -33,7 +33,7 @@ Find the minimal path sum, in matrix.txt (right click and "Save Link/Target As..
 ```yml
 tests:
   - text: <code>euler82()</code> should return 260324.
-    testString: 'assert.strictEqual(euler82(), 260324, "<code>euler82()</code> should return 260324.");'
+    testString: assert.strictEqual(euler82(), 260324, '<code>euler82()</code> should return 260324.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-83-path-sum-four-ways.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-83-path-sum-four-ways.english.md
index 8e7fab8a5a..a05520fd2c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-83-path-sum-four-ways.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-83-path-sum-four-ways.english.md
@@ -34,7 +34,7 @@ Find the minimal path sum, in matrix.txt (right click and
 ```yml
 tests:
   - text: <code>euler83()</code> should return 425185.
-    testString: 'assert.strictEqual(euler83(), 425185, "<code>euler83()</code> should return 425185.");'
+    testString: assert.strictEqual(euler83(), 425185, '<code>euler83()</code> should return 425185.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-84-monopoly-odds.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-84-monopoly-odds.english.md
index fe95722ee9..0848a1ab69 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-84-monopoly-odds.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-84-monopoly-odds.english.md
@@ -94,7 +94,7 @@ If, instead of using two 6-sided dice, two 4-sided dice are used, find the six-d
 ```yml
 tests:
   - text: <code>euler84()</code> should return 101524.
-    testString: 'assert.strictEqual(euler84(), 101524, "<code>euler84()</code> should return 101524.");'
+    testString: assert.strictEqual(euler84(), 101524, '<code>euler84()</code> should return 101524.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-85-counting-rectangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-85-counting-rectangles.english.md
index ab8981fd73..b9dbbf2597 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-85-counting-rectangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-85-counting-rectangles.english.md
@@ -23,7 +23,7 @@ Although there exists no rectangular grid that contains exactly two million rect
 ```yml
 tests:
   - text: <code>euler85()</code> should return 2772.
-    testString: 'assert.strictEqual(euler85(), 2772, "<code>euler85()</code> should return 2772.");'
+    testString: assert.strictEqual(euler85(), 2772, '<code>euler85()</code> should return 2772.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-86-cuboid-route.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-86-cuboid-route.english.md
index 6ec180c3e4..f57e87467f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-86-cuboid-route.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-86-cuboid-route.english.md
@@ -25,7 +25,7 @@ Find the least value of M such that the number of solutions first exceeds one mi
 ```yml
 tests:
   - text: <code>euler86()</code> should return 1818.
-    testString: 'assert.strictEqual(euler86(), 1818, "<code>euler86()</code> should return 1818.");'
+    testString: assert.strictEqual(euler86(), 1818, '<code>euler86()</code> should return 1818.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-87-prime-power-triples.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-87-prime-power-triples.english.md
index fe07f9a418..9c6fb3d733 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-87-prime-power-triples.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-87-prime-power-triples.english.md
@@ -25,7 +25,7 @@ How many numbers below fifty million can be expressed as the sum of a prime squa
 ```yml
 tests:
   - text: <code>euler87()</code> should return 1097343.
-    testString: 'assert.strictEqual(euler87(), 1097343, "<code>euler87()</code> should return 1097343.");'
+    testString: assert.strictEqual(euler87(), 1097343, '<code>euler87()</code> should return 1097343.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-88-product-sum-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-88-product-sum-numbers.english.md
index 9b12e8ccf1..57c2983830 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-88-product-sum-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-88-product-sum-numbers.english.md
@@ -26,7 +26,7 @@ What is the sum of all the minimal product-sum numbers for 2≤k≤12000?
 ```yml
 tests:
   - text: <code>euler88()</code> should return 7587457.
-    testString: 'assert.strictEqual(euler88(), 7587457, "<code>euler88()</code> should return 7587457.");'
+    testString: assert.strictEqual(euler88(), 7587457, '<code>euler88()</code> should return 7587457.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-89-roman-numerals.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-89-roman-numerals.english.md
index 7cdddb3b5f..3eb5843238 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-89-roman-numerals.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-89-roman-numerals.english.md
@@ -31,7 +31,7 @@ Note: You can assume that all the Roman numerals in the file contain no more tha
 ```yml
 tests:
   - text: <code>euler89()</code> should return 743.
-    testString: 'assert.strictEqual(euler89(), 743, "<code>euler89()</code> should return 743.");'
+    testString: assert.strictEqual(euler89(), 743, '<code>euler89()</code> should return 743.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-9-special-pythagorean-triplet.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-9-special-pythagorean-triplet.english.md
index 736634d42a..4fb0cf4855 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-9-special-pythagorean-triplet.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-9-special-pythagorean-triplet.english.md
@@ -23,11 +23,11 @@ There exists exactly one Pythagorean triplet for which <var>a</var> + <var>b</va
 ```yml
 tests:
   - text: <code>specialPythagoreanTriplet(1000)</code> should return 31875000.
-    testString: 'assert.strictEqual(specialPythagoreanTriplet(1000), 31875000, "<code>specialPythagoreanTriplet(1000)</code> should return 31875000.");'
+    testString: assert.strictEqual(specialPythagoreanTriplet(1000), 31875000, '<code>specialPythagoreanTriplet(1000)</code> should return 31875000.');
   - text: <code>specialPythagoreanTriplet(24)</code> should return 480.
-    testString: 'assert.strictEqual(specialPythagoreanTriplet(24), 480, "<code>specialPythagoreanTriplet(24)</code> should return 480.");'
+    testString: assert.strictEqual(specialPythagoreanTriplet(24), 480, '<code>specialPythagoreanTriplet(24)</code> should return 480.');
   - text: <code>specialPythagoreanTriplet(120)</code> should return 49920.
-    testString: 'assert.strictEqual(specialPythagoreanTriplet(120), 49920, "<code>specialPythagoreanTriplet(120)</code> should return 49920.");'
+    testString: assert.strictEqual(specialPythagoreanTriplet(120), 49920, '<code>specialPythagoreanTriplet(120)</code> should return 49920.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-90-cube-digit-pairs.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-90-cube-digit-pairs.english.md
index 72673b7ef6..520f088657 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-90-cube-digit-pairs.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-90-cube-digit-pairs.english.md
@@ -40,7 +40,7 @@ How many distinct arrangements of the two cubes allow for all of the square numb
 ```yml
 tests:
   - text: <code>euler90()</code> should return 1217.
-    testString: 'assert.strictEqual(euler90(), 1217, "<code>euler90()</code> should return 1217.");'
+    testString: assert.strictEqual(euler90(), 1217, '<code>euler90()</code> should return 1217.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-91-right-triangles-with-integer-coordinates.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-91-right-triangles-with-integer-coordinates.english.md
index 5d90752c04..e78f7a43c8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-91-right-triangles-with-integer-coordinates.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-91-right-triangles-with-integer-coordinates.english.md
@@ -30,7 +30,7 @@ Given that 0 ≤ x1, y1, x2, y2 ≤ 50, how many right triangles can be formed?
 ```yml
 tests:
   - text: <code>euler91()</code> should return 14234.
-    testString: 'assert.strictEqual(euler91(), 14234, "<code>euler91()</code> should return 14234.");'
+    testString: assert.strictEqual(euler91(), 14234, '<code>euler91()</code> should return 14234.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-92-square-digit-chains.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-92-square-digit-chains.english.md
index 498821f67a..a2858c660b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-92-square-digit-chains.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-92-square-digit-chains.english.md
@@ -25,7 +25,7 @@ How many starting numbers below ten million will arrive at 89?
 ```yml
 tests:
   - text: <code>euler92()</code> should return 8581146.
-    testString: 'assert.strictEqual(euler92(), 8581146, "<code>euler92()</code> should return 8581146.");'
+    testString: assert.strictEqual(euler92(), 8581146, '<code>euler92()</code> should return 8581146.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-93-arithmetic-expressions.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-93-arithmetic-expressions.english.md
index 2f4b5b944e..dfeb708a22 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-93-arithmetic-expressions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-93-arithmetic-expressions.english.md
@@ -28,7 +28,7 @@ Find the set of four distinct digits, a < b < c < d, for which the longest set o
 ```yml
 tests:
   - text: <code>euler93()</code> should return 1258.
-    testString: 'assert.strictEqual(euler93(), 1258, "<code>euler93()</code> should return 1258.");'
+    testString: assert.strictEqual(euler93(), 1258, '<code>euler93()</code> should return 1258.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-94-almost-equilateral-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-94-almost-equilateral-triangles.english.md
index ea2317f8da..c48a3a55a5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-94-almost-equilateral-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-94-almost-equilateral-triangles.english.md
@@ -22,7 +22,7 @@ Find the sum of the perimeters of all almost equilateral triangles with integral
 ```yml
 tests:
   - text: <code>euler94()</code> should return 518408346.
-    testString: 'assert.strictEqual(euler94(), 518408346, "<code>euler94()</code> should return 518408346.");'
+    testString: assert.strictEqual(euler94(), 518408346, '<code>euler94()</code> should return 518408346.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-95-amicable-chains.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-95-amicable-chains.english.md
index 1989efac8b..4fa8f2eb46 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-95-amicable-chains.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-95-amicable-chains.english.md
@@ -25,7 +25,7 @@ Find the smallest member of the longest amicable chain with no element exceeding
 ```yml
 tests:
   - text: <code>euler95()</code> should return 14316.
-    testString: 'assert.strictEqual(euler95(), 14316, "<code>euler95()</code> should return 14316.");'
+    testString: assert.strictEqual(euler95(), 14316, '<code>euler95()</code> should return 14316.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-96-su-doku.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-96-su-doku.english.md
index 543ff5745b..bcab1aa51c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-96-su-doku.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-96-su-doku.english.md
@@ -48,7 +48,7 @@ By solving all fifty puzzles find the sum of the 3-digit numbers found in the to
 ```yml
 tests:
   - text: <code>euler96()</code> should return 24702.
-    testString: 'assert.strictEqual(euler96(), 24702, "<code>euler96()</code> should return 24702.");'
+    testString: assert.strictEqual(euler96(), 24702, '<code>euler96()</code> should return 24702.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-97-large-non-mersenne-prime.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-97-large-non-mersenne-prime.english.md
index 20ec08eeaf..7c39f45783 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-97-large-non-mersenne-prime.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-97-large-non-mersenne-prime.english.md
@@ -22,7 +22,7 @@ Find the last ten digits of this prime number.
 ```yml
 tests:
   - text: <code>euler97()</code> should return 8739992577.
-    testString: 'assert.strictEqual(euler97(), 8739992577, "<code>euler97()</code> should return 8739992577.");'
+    testString: assert.strictEqual(euler97(), 8739992577, '<code>euler97()</code> should return 8739992577.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-98-anagramic-squares.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-98-anagramic-squares.english.md
index fc6de999c4..2c9233c3ec 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-98-anagramic-squares.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-98-anagramic-squares.english.md
@@ -23,7 +23,7 @@ NOTE: All anagrams formed must be contained in the given text file.
 ```yml
 tests:
   - text: <code>euler98()</code> should return 18769.
-    testString: 'assert.strictEqual(euler98(), 18769, "<code>euler98()</code> should return 18769.");'
+    testString: assert.strictEqual(euler98(), 18769, '<code>euler98()</code> should return 18769.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-99-largest-exponential.english.md b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-99-largest-exponential.english.md
index 181e86a28f..d4ae91da9b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-99-largest-exponential.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-99-largest-exponential.english.md
@@ -23,7 +23,7 @@ NOTE: The first two lines in the file represent the numbers in the example given
 ```yml
 tests:
   - text: <code>euler99()</code> should return 709.
-    testString: 'assert.strictEqual(euler99(), 709, "<code>euler99()</code> should return 709.");'
+    testString: assert.strictEqual(euler99(), 709, '<code>euler99()</code> should return 709.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/100-doors.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/100-doors.english.md
index 18f145c190..3eca35396b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/100-doors.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/100-doors.english.md
@@ -21,11 +21,11 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>getFinalOpenedDoors</code> is a function.
-    testString: 'assert(typeof getFinalOpenedDoors === "function", "<code>getFinalOpenedDoors</code> is a function.");'
+    testString: assert(typeof getFinalOpenedDoors === 'function', '<code>getFinalOpenedDoors</code> is a function.');
   - text: <code>getFinalOpenedDoors</code> should return an array.
-    testString: 'assert(Array.isArray(getFinalOpenedDoors(100)), "<code>getFinalOpenedDoors</code> should return an array.");'
+    testString: assert(Array.isArray(getFinalOpenedDoors(100)), '<code>getFinalOpenedDoors</code> should return an array.');
   - text: <code>getFinalOpenedDoors</code> did not produce the correct results.
-    testString: 'assert.deepEqual(getFinalOpenedDoors(100), solution, "<code>getFinalOpenedDoors</code> did not produce the correct results.");'
+    testString: assert.deepEqual(getFinalOpenedDoors(100), solution, '<code>getFinalOpenedDoors</code> did not produce the correct results.');
 
 ```
 
@@ -49,7 +49,7 @@ function getFinalOpenedDoors (numDoors) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const solution = [1, 4, 9, 16, 25, 36, 49, 64, 81, 100];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/24-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/24-game.english.md
index 21e113077a..41ddf0bfcd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/24-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/24-game.english.md
@@ -35,15 +35,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>solve24</code> is a function.
-    testString: 'assert(typeof solve24 === "function", "<code>solve24</code> is a function.");'
+    testString: assert(typeof solve24 === 'function', '<code>solve24</code> is a function.');
   - text: <code>solve24("4878")</code> should return <code>(7-8/8)*4</code> or <code>4*(7-8/8)</code>
-    testString: 'assert(include(answers[0], solve24(testCases[0])), "<code>solve24("4878")</code> should return <code>(7-8/8)*4</code> or <code>4*(7-8/8)</code>");'
+    testString: assert(include(answers[0], solve24(testCases[0])), '<code>solve24("4878")</code> should return <code>(7-8/8)*4</code> or <code>4*(7-8/8)</code>');
   - text: <code>solve24("1234")</code> should return any arrangement of <code>1*2*3*4</code>
-    testString: 'assert(include(answers[1], solve24(testCases[1])), "<code>solve24("1234")</code> should return any arrangement of <code>1*2*3*4</code>");'
+    testString: assert(include(answers[1], solve24(testCases[1])), '<code>solve24("1234")</code> should return any arrangement of <code>1*2*3*4</code>');
   - text: <code>solve24("6789")</code> should return <code>(6*8)/(9-7)</code> or <code>(8*6)/(9-7)</code>
-    testString: 'assert(include(answers[2], solve24(testCases[2])), "<code>solve24("6789")</code> should return <code>(6*8)/(9-7)</code> or <code>(8*6)/(9-7)</code>");'
+    testString: assert(include(answers[2], solve24(testCases[2])), '<code>solve24("6789")</code> should return <code>(6*8)/(9-7)</code> or <code>(8*6)/(9-7)</code>');
   - text: <code>solve24("1127")</code> should return a permutation of <code>(1+7)*(1*2)</code>
-    testString: 'assert(include(answers[3], solve24(testCases[3])), "<code>solve24("1127")</code> should return a permutation of <code>(1+7)*(1*2)</code>");'
+    testString: assert(include(answers[3], solve24(testCases[3])), '<code>solve24("1127")</code> should return a permutation of <code>(1+7)*(1*2)</code>');
 
 ```
 
@@ -68,7 +68,24 @@ function solve24 (numStr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [
+  '4878',
+  '1234',
+  '6789',
+  '1127'
+];
+
+const answers = [
+  ['(7-8/8)*4', '4*(7-8/8)', '(4-8+7)*8', '(4+7-8)*8', '(7+4-8)*8', '(7-8+4)*8', '8*(4-8+7)', '8*(4+7-8)', '8*(7+4-8)', '8*(7-8+4)'],
+  ['1*2*3*4', '1*2*4*3', '1*3*2*4', '1*3*4*2', '1*4*2*3', '1*4*3*2', '2*1*3*4', '2*1*4*3', '2*3*1*4', '2*3*4*1', '2*4*3*1', '2*4*1*3', '3*1*2*4', '3*1*4*2', '3*2*1*4', '3*2*4*1', '3*4*1*2', '3*4*2*1', '4*1*2*3', '4*1*3*2', '4*2*1*3', '4*2*3*1', '4*3*1*2', '4*3*2*1', '(1+2+3)*4', '(1+3+2)*4', '(2+1+3)*4', '(2+3+1)*4', '(3+1+2)*4', '(3+2+1)*4', '4*(1+2+3)', '4*(2+1+3)', '4*(2+3+1)', '4*(3+1+2)', '4*(3+2+1)'],
+  ['(6*8)/(9-7)', '(8*6)/(9-7)', '6*8/(9-7)', '8*6/(9-7)'],
+  ['(1+7)*(2+1)', '(1+7)*(1+2)', '(1+2)*(1+7)', '(1+2)*(7+1)', '(2+1)*(1+7)', '(7+1)*(2+1)']
+];
+
+function include(ansArr, res) {
+  const index = ansArr.indexOf(res);
+  return index >= 0;
+}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/9-billion-names-of-god-the-integer.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/9-billion-names-of-god-the-integer.english.md
index adec0ae9df..310a9ca650 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/9-billion-names-of-god-the-integer.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/9-billion-names-of-god-the-integer.english.md
@@ -40,19 +40,19 @@ Task
 ```yml
 tests:
   - text: <code>numberOfNames</code> is a function.
-    testString: 'assert(typeof numberOfNames === "function", "<code>numberOfNames</code> is a function.");'
+    testString: assert(typeof numberOfNames === 'function', '<code>numberOfNames</code> is a function.');
   - text: <code>numberOfNames(5)</code> should equal 7.
-    testString: 'assert.equal(numberOfNames(5), 7, "<code>numberOfNames(5)</code> should equal 7.");'
+    testString: assert.equal(numberOfNames(5), 7, '<code>numberOfNames(5)</code> should equal 7.');
   - text: <code>numberOfNames(12)</code> should equal 77.
-    testString: 'assert.equal(numberOfNames(12), 77, "<code>numberOfNames(12)</code> should equal 77.");'
+    testString: assert.equal(numberOfNames(12), 77, '<code>numberOfNames(12)</code> should equal 77.');
   - text: <code>numberOfNames(18)</code> should equal 385.
-    testString: 'assert.equal(numberOfNames(18), 385, "<code>numberOfNames(18)</code> should equal 385.");'
+    testString: assert.equal(numberOfNames(18), 385, '<code>numberOfNames(18)</code> should equal 385.');
   - text: <code>numberOfNames(23)</code> should equal 1255.
-    testString: 'assert.equal(numberOfNames(23), 1255, "<code>numberOfNames(23)</code> should equal 1255.");'
+    testString: assert.equal(numberOfNames(23), 1255, '<code>numberOfNames(23)</code> should equal 1255.');
   - text: <code>numberOfNames(42)</code> should equal 53174.
-    testString: 'assert.equal(numberOfNames(42), 53174, "<code>numberOfNames(42)</code> should equal 53174.");'
+    testString: assert.equal(numberOfNames(42), 53174, '<code>numberOfNames(42)</code> should equal 53174.');
   - text: <code>numberOfNames(123)</code> should equal 2552338241.
-    testString: 'assert.equal(numberOfNames(123), 2552338241, "<code>numberOfNames(123)</code> should equal 2552338241.");'
+    testString: assert.equal(numberOfNames(123), 2552338241, '<code>numberOfNames(123)</code> should equal 2552338241.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abc-problem.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abc-problem.english.md
index 897b2a90e1..5cf75837f3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abc-problem.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abc-problem.english.md
@@ -44,21 +44,21 @@ The function should be case-insensitive.
 ```yml
 tests:
   - text: <code>canMakeWord</code> is a function.
-    testString: 'assert(typeof canMakeWord === "function", "<code>canMakeWord</code> is a function.");'
+    testString: assert(typeof canMakeWord === 'function', '<code>canMakeWord</code> is a function.');
   - text: <code>canMakeWord</code> should return a boolean.
-    testString: 'assert(typeof canMakeWord("hi") === "boolean", "<code>canMakeWord</code> should return a boolean.");'
+    testString: assert(typeof canMakeWord('hi') === 'boolean', '<code>canMakeWord</code> should return a boolean.');
   - text: <code>canMakeWord("bark")</code> should return true.
-    testString: 'assert(canMakeWord(words[0]), "<code>canMakeWord("bark")</code> should return true.");'
+    testString: assert(canMakeWord(words[0]), '<code>canMakeWord("bark")</code> should return true.');
   - text: <code>canMakeWord("BooK")</code> should return false.
-    testString: 'assert(!canMakeWord(words[1]), "<code>canMakeWord("BooK")</code> should return false.");'
+    testString: assert(!canMakeWord(words[1]), '<code>canMakeWord("BooK")</code> should return false.');
   - text: <code>canMakeWord("TReAT")</code> should return true.
-    testString: 'assert(canMakeWord(words[2]), "<code>canMakeWord("TReAT")</code> should return true.");'
+    testString: assert(canMakeWord(words[2]), '<code>canMakeWord("TReAT")</code> should return true.');
   - text: <code>canMakeWord("COMMON")</code> should return false.
-    testString: 'assert(!canMakeWord(words[3]), "<code>canMakeWord("COMMON")</code> should return false.");'
+    testString: assert(!canMakeWord(words[3]), '<code>canMakeWord("COMMON")</code> should return false.');
   - text: <code>canMakeWord("squAD")</code> should return true.
-    testString: 'assert(canMakeWord(words[4]), "<code>canMakeWord("squAD")</code> should return true.");'
+    testString: assert(canMakeWord(words[4]), '<code>canMakeWord("squAD")</code> should return true.');
   - text: <code>canMakeWord("conFUSE")</code> should return true.
-    testString: 'assert(canMakeWord(words[5]), "<code>canMakeWord("conFUSE")</code> should return true.");'
+    testString: assert(canMakeWord(words[5]), '<code>canMakeWord("conFUSE")</code> should return true.');
 
 ```
 
@@ -82,7 +82,7 @@ function canMakeWord (word) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const words = ['bark', 'BooK', 'TReAT', 'COMMON', 'squAD', 'conFUSE'];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abundant-deficient-and-perfect-number-classifications.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abundant-deficient-and-perfect-number-classifications.english.md
index 0728ec8362..dc6284a650 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abundant-deficient-and-perfect-number-classifications.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/abundant-deficient-and-perfect-number-classifications.english.md
@@ -28,13 +28,13 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>getDPA</code> is a function.
-    testString: 'assert(typeof getDPA === "function", "<code>getDPA</code> is a function.");'
+    testString: assert(typeof getDPA === 'function', '<code>getDPA</code> is a function.');
   - text: <code>getDPA</code> should return an array.
-    testString: 'assert(Array.isArray(getDPA(100)), "<code>getDPA</code> should return an array.");'
+    testString: assert(Array.isArray(getDPA(100)), '<code>getDPA</code> should return an array.');
   - text: <code>getDPA</code> return value should have a length of 3.
-    testString: 'assert(getDPA(100).length === 3, "<code>getDPA</code> return value should have a length of 3.");'
-  - text: '<code>getDPA(20000)</code> should equal [15043, 4, 4953]'
-    testString: 'assert.deepEqual(getDPA(20000), solution, "<code>getDPA(20000)</code> should equal [15043, 4, 4953]");'
+    testString: assert(getDPA(100).length === 3, '<code>getDPA</code> return value should have a length of 3.');
+  - text: <code>getDPA(20000)</code> should equal [15043, 4, 4953]
+    testString: assert.deepEqual(getDPA(20000), solution, '<code>getDPA(20000)</code> should equal [15043, 4, 4953]');
 
 ```
 
@@ -58,7 +58,7 @@ function getDPA (num) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const solution = [15043, 4, 4953];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/accumulator-factory.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/accumulator-factory.english.md
index 3ac08927d1..cf719711cd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/accumulator-factory.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/accumulator-factory.english.md
@@ -24,13 +24,13 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>accumulator</code> is a function.
-    testString: 'assert(typeof accumulator === "function", "<code>accumulator</code> is a function.");'
+    testString: assert(typeof accumulator === 'function', '<code>accumulator</code> is a function.');
   - text: <code>accumulator(0)</code> should return a function.
-    testString: 'assert(typeof accumulator(0) === "function", "<code>accumulator(0)</code> should return a function.");'
+    testString: assert(typeof accumulator(0) === 'function', '<code>accumulator(0)</code> should return a function.');
   - text: <code>accumulator(0)(2)</code> should return a number.
-    testString: 'assert(typeof accumulator(0)(2) === "number", "<code>accumulator(0)(2)</code> should return a number.");'
-  - text: 'Passing in the values 3, -4, 1.5, and 5 should return 5.5.'
-    testString: 'assert(testFn(5) === 5.5, "Passing in the values 3, -4, 1.5, and 5 should return 5.5.");'
+    testString: assert(typeof accumulator(0)(2) === 'number', '<code>accumulator(0)(2)</code> should return a number.');
+  - text: Passing in the values 3, -4, 1.5, and 5 should return 5.5.
+    testString: assert(testFn(5) === 5.5, 'Passing in the values 3, -4, 1.5, and 5 should return 5.5.');
 
 ```
 
@@ -54,7 +54,11 @@ function accumulator (sum) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testFn = typeof accumulator(3) === 'function' && accumulator(3);
+if (testFn) {
+  testFn(-4);
+  testFn(1.5);
+}
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ackermann-function.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ackermann-function.english.md
index 22827322d9..a59a8045de 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ackermann-function.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ackermann-function.english.md
@@ -28,15 +28,15 @@ $$A(m, n) =
 ```yml
 tests:
   - text: <code>ack</code> is a function.
-    testString: 'assert(typeof ack === "function", "<code>ack</code> is a function.");'
-  - text: '<code>ack(0, 0)</code> should return 1.'
-    testString: 'assert(ack(0, 0) === 1, "<code>ack(0, 0)</code> should return 1.");'
-  - text: '<code>ack(1, 1)</code> should return 3.'
-    testString: 'assert(ack(1, 1) === 3, "<code>ack(1, 1)</code> should return 3.");'
-  - text: '<code>ack(2, 5)</code> should return 13.'
-    testString: 'assert(ack(2, 5) === 13, "<code>ack(2, 5)</code> should return 13.");'
-  - text: '<code>ack(3, 3)</code> should return 61.'
-    testString: 'assert(ack(3, 3) === 61, "<code>ack(3, 3)</code> should return 61.");'
+    testString: assert(typeof ack === 'function', '<code>ack</code> is a function.');
+  - text: <code>ack(0, 0)</code> should return 1.
+    testString: assert(ack(0, 0) === 1, '<code>ack(0, 0)</code> should return 1.');
+  - text: <code>ack(1, 1)</code> should return 3.
+    testString: assert(ack(1, 1) === 3, '<code>ack(1, 1)</code> should return 3.');
+  - text: <code>ack(2, 5)</code> should return 13.
+    testString: assert(ack(2, 5) === 13, '<code>ack(2, 5)</code> should return 13.');
+  - text: <code>ack(3, 3)</code> should return 61.
+    testString: assert(ack(3, 3) === 61, '<code>ack(3, 3)</code> should return 61.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/align-columns.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/align-columns.english.md
index 7aaefb5af8..6d4037c0af 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/align-columns.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/align-columns.english.md
@@ -40,13 +40,13 @@ It is not a requirement to add separating characters between or around columns.
 ```yml
 tests:
   - text: <code>formatText</code> is a function.
-    testString: 'assert(typeof formatText === "function", "<code>formatText</code> is a function.");'
+    testString: assert(typeof formatText === 'function', '<code>formatText</code> is a function.');
   - text: '<code>formatText</code> with the above input and "right" justification should produce the following: '
-    testString: 'assert.strictEqual(formatText(testInput, "right"), rightAligned, "<code>formatText</code> with the above input and "right" justification should produce the following: ");'
+    testString: 'assert.strictEqual(formatText(testInput, ''right''), rightAligned, ''<code>formatText</code> with the above input and "right" justification should produce the following: '');'
   - text: '<code>formatText</code> with the above input and "left" justification should produce the following: '
-    testString: 'assert.strictEqual(formatText(testInput, "left"), leftAligned, "<code>formatText</code> with the above input and "left" justification should produce the following: ");'
+    testString: 'assert.strictEqual(formatText(testInput, ''left''), leftAligned, ''<code>formatText</code> with the above input and "left" justification should produce the following: '');'
   - text: '<code>formatText</code> with the above input and "center" justification should produce the following: '
-    testString: 'assert.strictEqual(formatText(testInput, "center"), centerAligned, "<code>formatText</code> with the above input and "center" justification should produce the following: ");'
+    testString: 'assert.strictEqual(formatText(testInput, ''center''), centerAligned, ''<code>formatText</code> with the above input and "center" justification should produce the following: '');'
 
 ```
 
@@ -83,9 +83,52 @@ function formatText (input, justification) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
-```
+const testInput = [
+  'Given$a$text$file$of$many$lines',
+  'where$fields$within$a$line$',
+  'are$delineated$by$a$single$\"dollar\"$character',
+  'write$a$program',
+  'that$aligns$each$column$of$fields$',
+  'by$ensuring$that$words$in$each$',
+  'column$are$separated$by$at$least$one$space.',
+  'Further,$allow$for$each$word$in$a$column$to$be$either$left$',
+  'justified,$right$justified',
+  'or$center$justified$within$its$column.'
+];
 
+const rightAligned = '     Given          a      text   file     of     many     lines\n' +
+'     where     fields    within      a   line \n' +
+'       are delineated        by      a single "dollar" character\n' +
+'     write          a   program\n' +
+'      that     aligns      each column     of   fields \n' +
+'        by   ensuring      that  words     in     each \n' +
+'    column        are separated     by     at    least       one space.\n' +
+'  Further,      allow       for   each   word       in         a column to be either left \n' +
+'justified,      right justified\n' +
+'        or     center justified within    its  column.';
+
+const leftAligned = 'Given      a          text      file   of     many     lines    \n' +
+'where      fields     within    a      line   \n' +
+'are        delineated by        a      single "dollar" character\n' +
+'write      a          program  \n' +
+'that       aligns     each      column of     fields   \n' +
+'by         ensuring   that      words  in     each     \n' +
+'column     are        separated by     at     least    one       space.\n' +
+'Further,   allow      for       each   word   in       a         column to be either left \n' +
+'justified, right      justified\n' +
+'or         center     justified within its    column. ';
+
+const centerAligned = '  Given        a        text     file    of     many     lines  \n' +
+'  where      fields    within     a     line  \n' +
+'   are     delineated    by       a    single \"dollar\" character\n' +
+'  write        a       program \n' +
+'   that      aligns     each    column   of    fields  \n' +
+'    by      ensuring    that    words    in     each   \n' +
+'  column      are     separated   by     at    least      one    space.\n' +
+' Further,    allow       for     each   word     in        a     column to be either left \n' +
+'justified,   right    justified\n' +
+'    or       center   justified within  its   column. ';
+```
 </div>
 
 </section>
@@ -131,10 +174,10 @@ function formatText (input, justification) {
         left = ' '.repeat(Math.floor(diff));
         right = ' '.repeat(Math.ceil(diff));
         if (justification === 'left') {
-          right += left; left = ";
+          right += left; left = '';
         }
         if (justification === 'right') {
-          left += right; right = ";
+          left += right; right = '';
         }
         input[y][x] = left + input[y][x] + right;
       }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/amicable-pairs.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/amicable-pairs.english.md
index 9311c99241..b4431c6536 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/amicable-pairs.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/amicable-pairs.english.md
@@ -30,13 +30,13 @@ Related tasks
 ```yml
 tests:
   - text: <code>amicablePairsUpTo</code> is a function.
-    testString: 'assert(typeof amicablePairsUpTo === "function", "<code>amicablePairsUpTo</code> is a function.");'
-  - text: '<code>amicablePairsUpTo(300)</code> should return <code>[[220,284]]</code>.'
-    testString: 'assert.deepEqual(amicablePairsUpTo(300), answer300, "<code>amicablePairsUpTo(300)</code> should return <code>[[220,284]]</code>.");'
-  - text: '<code>amicablePairsUpTo(3000)</code> should return <code>[[220,284],[1184,1210],[2620,2924]]</code>.'
-    testString: 'assert.deepEqual(amicablePairsUpTo(3000), answer3000, "<code>amicablePairsUpTo(3000)</code> should return <code>[[220,284],[1184,1210],[2620,2924]]</code>.");'
-  - text: '<code>amicablePairsUpTo(20000)</code> should return <code>[[220,284],[1184,1210],[2620,2924],[5020,5564],[6232,6368],[10744,10856],[12285,14595],[17296,18416]]</code>.'
-    testString: 'assert.deepEqual(amicablePairsUpTo(20000), answer20000, "<code>amicablePairsUpTo(20000)</code> should return <code>[[220,284],[1184,1210],[2620,2924],[5020,5564],[6232,6368],[10744,10856],[12285,14595],[17296,18416]]</code>.");'
+    testString: assert(typeof amicablePairsUpTo === 'function', '<code>amicablePairsUpTo</code> is a function.');
+  - text: <code>amicablePairsUpTo(300)</code> should return <code>[[220,284]]</code>.
+    testString: assert.deepEqual(amicablePairsUpTo(300), answer300, '<code>amicablePairsUpTo(300)</code> should return <code>[[220,284]]</code>.');
+  - text: <code>amicablePairsUpTo(3000)</code> should return <code>[[220,284],[1184,1210],[2620,2924]]</code>.
+    testString: assert.deepEqual(amicablePairsUpTo(3000), answer3000, '<code>amicablePairsUpTo(3000)</code> should return <code>[[220,284],[1184,1210],[2620,2924]]</code>.');
+  - text: <code>amicablePairsUpTo(20000)</code> should return <code>[[220,284],[1184,1210],[2620,2924],[5020,5564],[6232,6368],[10744,10856],[12285,14595],[17296,18416]]</code>.
+    testString: assert.deepEqual(amicablePairsUpTo(20000), answer20000, '<code>amicablePairsUpTo(20000)</code> should return <code>[[220,284],[1184,1210],[2620,2924],[5020,5564],[6232,6368],[10744,10856],[12285,14595],[17296,18416]]</code>.');
 
 ```
 
@@ -61,7 +61,22 @@ function amicablePairsUpTo (maxNum) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const answer300 = [[220, 284]];
+const answer3000 = [
+  [220, 284],
+  [1184, 1210],
+  [2620, 2924]
+];
+const answer20000 = [
+  [220, 284],
+  [1184, 1210],
+  [2620, 2924],
+  [5020, 5564],
+  [6232, 6368],
+  [10744, 10856],
+  [12285, 14595],
+  [17296, 18416]
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-mode.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-mode.english.md
index 0788658223..e11b047829 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-mode.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-mode.english.md
@@ -20,11 +20,11 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>mode</code> is a function.
-    testString: 'assert(typeof mode === "function", "<code>mode</code> is a function.");'
-  - text: '<code>mode([1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17])</code> should equal <code>[6]</code>'
-    testString: 'assert.deepEqual(mode(arr1), [6], "<code>mode([1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17])</code> should equal <code>[6]</code>");'
-  - text: '<code>mode([1, 2, 4, 4, 1])</code> should equal <code>[1, 4]</code>.'
-    testString: 'assert.deepEqual(mode(arr2).sort(), [1, 4], "<code>mode([1, 2, 4, 4, 1])</code> should equal <code>[1, 4]</code>.");'
+    testString: assert(typeof mode === 'function', '<code>mode</code> is a function.');
+  - text: <code>mode([1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17])</code> should equal <code>[6]</code>
+    testString: assert.deepEqual(mode(arr1), [6], '<code>mode([1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17])</code> should equal <code>[6]</code>');
+  - text: <code>mode([1, 2, 4, 4, 1])</code> should equal <code>[1, 4]</code>.
+    testString: assert.deepEqual(mode(arr2).sort(), [1, 4], '<code>mode([1, 2, 4, 4, 1])</code> should equal <code>[1, 4]</code>.');
 
 ```
 
@@ -49,7 +49,8 @@ function mode (arr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const arr1 = [1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17];
+const arr2 = [1, 2, 4, 4, 1];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-pythagorean-means.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-pythagorean-means.english.md
index 69f551c9cc..bd30c31489 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-pythagorean-means.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-pythagorean-means.english.md
@@ -32,9 +32,9 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>pythagoreanMeans</code> is a function.
-    testString: 'assert(typeof pythagoreanMeans === "function", "<code>pythagoreanMeans</code> is a function.");'
-  - text: '<code>pythagoreanMeans([1, 2, ..., 10])</code> should equal the same output above.'
-    testString: 'assert.deepEqual(pythagoreanMeans(range1), answer1, "<code>pythagoreanMeans([1, 2, ..., 10])</code> should equal the same output above.");'
+    testString: assert(typeof pythagoreanMeans === 'function', '<code>pythagoreanMeans</code> is a function.');
+  - text: <code>pythagoreanMeans([1, 2, ..., 10])</code> should equal the same output above.
+    testString: assert.deepEqual(pythagoreanMeans(range1), answer1, '<code>pythagoreanMeans([1, 2, ..., 10])</code> should equal the same output above.');
 
 ```
 
@@ -58,7 +58,16 @@ function pythagoreanMeans (rangeArr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const range1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+const answer1 = {
+  values: {
+    Arithmetic: 5.5,
+    Geometric: 4.528728688116765,
+    Harmonic: 3.414171521474055
+  },
+  test: 'is A >= G >= H ? yes'
+};
+
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-root-mean-square.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-root-mean-square.english.md
index e3cc9c2df0..e94826d920 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-root-mean-square.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/averages-root-mean-square.english.md
@@ -22,9 +22,9 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>rms</code> is a function.
-    testString: 'assert(typeof rms === "function", "<code>rms</code> is a function.");'
-  - text: '<code>rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])</code> should equal <code>6.2048368229954285</code>.'
-    testString: 'assert.equal(rms(arr1), answer1, "<code>rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])</code> should equal <code>6.2048368229954285</code>.");'
+    testString: assert(typeof rms === 'function', '<code>rms</code> is a function.');
+  - text: <code>rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])</code> should equal <code>6.2048368229954285</code>.
+    testString: assert.equal(rms(arr1), answer1, '<code>rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])</code> should equal <code>6.2048368229954285</code>.');
 
 ```
 
@@ -48,7 +48,8 @@ function rms (arr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+const answer1 = 6.2048368229954285;
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/babbage-problem.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/babbage-problem.english.md
index 2b872d366e..39535a5e07 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/babbage-problem.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/babbage-problem.english.md
@@ -25,9 +25,9 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>babbage</code> is a function.
-    testString: 'assert(typeof babbage === "function", "<code>babbage</code> is a function.");'
-  - text: '<code>babbage(99736, 269696)</code> should not return 99736 (there is a smaller answer).'
-    testString: 'assert.equal(babbage(babbageAns, endDigits), answer, "<code>babbage(99736, 269696)</code> should not return 99736 (there is a smaller answer).");'
+    testString: assert(typeof babbage === 'function', '<code>babbage</code> is a function.');
+  - text: <code>babbage(99736, 269696)</code> should not return 99736 (there is a smaller answer).
+    testString: assert.equal(babbage(babbageAns, endDigits), answer, '<code>babbage(99736, 269696)</code> should not return 99736 (there is a smaller answer).');
 
 ```
 
@@ -52,7 +52,9 @@ function babbage (babbageNum, endDigits) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const babbageAns = 99736;
+const endDigits = 269696;
+const answer = 25264;
 ```
 
 </div>
@@ -66,7 +68,7 @@ console.info('after the test');
 ```js
 function babbage (babbageAns, endDigits) {
   const babbageNum = Math.pow(babbageAns, 2);
-  const babbageStartDigits = parseInt(babbageNum.toString().replace('269696', "));
+  const babbageStartDigits = parseInt(babbageNum.toString().replace('269696', ''));
   let answer = 99736;
 
   // count down from this answer and save any sqrt int result. return lowest one
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/balanced-brackets.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/balanced-brackets.english.md
index 762fdc2d96..b904a4fa61 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/balanced-brackets.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/balanced-brackets.english.md
@@ -28,43 +28,43 @@ Examples:
 ```yml
 tests:
   - text: <code>isBalanced</code> is a function.
-    testString: 'assert(typeof isBalanced === "function", "<code>isBalanced</code> is a function.");'
-  - text: '<code>isBalanced("[]")</code> should return true.'
-    testString: 'assert(isBalanced(testCases[0]), "<code>isBalanced("[]")</code> should return true.");'
-  - text: '<code>isBalanced("]][[[][][][]][")</code> should return false.'
-    testString: 'assert(!isBalanced(testCases[1]), "<code>isBalanced("]][[[][][][]][")</code> should return false.");'
-  - text: '<code>isBalanced("[][[[[][][[[]]]]]]")</code> should return true.'
-    testString: 'assert(isBalanced(testCases[2]), "<code>isBalanced("[][[[[][][[[]]]]]]")</code> should return true.");'
-  - text: '<code>isBalanced("][")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[3]), "<code>isBalanced("][")</code> should return true.");'
-  - text: '<code>isBalanced("[[[]]]][[]")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[4]), "<code>isBalanced("[[[]]]][[]")</code> should return true.");'
-  - text: '<code>isBalanced("][[]")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[5]), "<code>isBalanced("][[]")</code> should return true.");'
-  - text: '<code>isBalanced("][[][]][[[]]")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[6]), "<code>isBalanced("][[][]][[[]]")</code> should return true.");'
-  - text: '<code>isBalanced("[[][]]][")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[7]), "<code>isBalanced("[[][]]][")</code> should return true.");'
-  - text: '<code>isBalanced("[[[]]][[]]]][][[")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[8]), "<code>isBalanced("[[[]]][[]]]][][[")</code> should return true.");'
-  - text: '<code>isBalanced("[]][[]]][[[[][]]")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[9]), "<code>isBalanced("[]][[]]][[[[][]]")</code> should return true.");'
-  - text: '<code>isBalanced("][]][[][")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[10]), "<code>isBalanced("][]][[][")</code> should return true.");'
-  - text: '<code>isBalanced("[[]][[][]]")</code> should return true.'
-    testString: 'assert(isBalanced(testCases[11]), "<code>isBalanced("[[]][[][]]")</code> should return true.");'
-  - text: '<code>isBalanced("[[]]")</code> should return true.'
-    testString: 'assert(isBalanced(testCases[12]), "<code>isBalanced("[[]]")</code> should return true.");'
-  - text: '<code>isBalanced("]][]][[]][[[")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[13]), "<code>isBalanced("]][]][[]][[[")</code> should return true.");'
-  - text: '<code>isBalanced("][]][][[")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[14]), "<code>isBalanced("][]][][[")</code> should return true.");'
-  - text: '<code>isBalanced("][][")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[15]), "<code>isBalanced("][][")</code> should return true.");'
-  - text: '<code>isBalanced("[[]]][][][[]][")</code> should return true.'
-    testString: 'assert(!isBalanced(testCases[16]), "<code>isBalanced("[[]]][][][[]][")</code> should return true.");'
+    testString: assert(typeof isBalanced === 'function', '<code>isBalanced</code> is a function.');
+  - text: <code>isBalanced("[]")</code> should return true.
+    testString: assert(isBalanced(testCases[0]), '<code>isBalanced("[]")</code> should return true.');
+  - text: <code>isBalanced("]][[[][][][]][")</code> should return false.
+    testString: assert(!isBalanced(testCases[1]), '<code>isBalanced("]][[[][][][]][")</code> should return false.');
+  - text: <code>isBalanced("[][[[[][][[[]]]]]]")</code> should return true.
+    testString: assert(isBalanced(testCases[2]), '<code>isBalanced("[][[[[][][[[]]]]]]")</code> should return true.');
+  - text: <code>isBalanced("][")</code> should return true.
+    testString: assert(!isBalanced(testCases[3]), '<code>isBalanced("][")</code> should return true.');
+  - text: <code>isBalanced("[[[]]]][[]")</code> should return true.
+    testString: assert(!isBalanced(testCases[4]), '<code>isBalanced("[[[]]]][[]")</code> should return true.');
+  - text: <code>isBalanced("][[]")</code> should return true.
+    testString: assert(!isBalanced(testCases[5]), '<code>isBalanced("][[]")</code> should return true.');
+  - text: <code>isBalanced("][[][]][[[]]")</code> should return true.
+    testString: assert(!isBalanced(testCases[6]), '<code>isBalanced("][[][]][[[]]")</code> should return true.');
+  - text: <code>isBalanced("[[][]]][")</code> should return true.
+    testString: assert(!isBalanced(testCases[7]), '<code>isBalanced("[[][]]][")</code> should return true.');
+  - text: <code>isBalanced("[[[]]][[]]]][][[")</code> should return true.
+    testString: assert(!isBalanced(testCases[8]), '<code>isBalanced("[[[]]][[]]]][][[")</code> should return true.');
+  - text: <code>isBalanced("[]][[]]][[[[][]]")</code> should return true.
+    testString: assert(!isBalanced(testCases[9]), '<code>isBalanced("[]][[]]][[[[][]]")</code> should return true.');
+  - text: <code>isBalanced("][]][[][")</code> should return true.
+    testString: assert(!isBalanced(testCases[10]), '<code>isBalanced("][]][[][")</code> should return true.');
+  - text: <code>isBalanced("[[]][[][]]")</code> should return true.
+    testString: assert(isBalanced(testCases[11]), '<code>isBalanced("[[]][[][]]")</code> should return true.');
+  - text: <code>isBalanced("[[]]")</code> should return true.
+    testString: assert(isBalanced(testCases[12]), '<code>isBalanced("[[]]")</code> should return true.');
+  - text: <code>isBalanced("]][]][[]][[[")</code> should return true.
+    testString: assert(!isBalanced(testCases[13]), '<code>isBalanced("]][]][[]][[[")</code> should return true.');
+  - text: <code>isBalanced("][]][][[")</code> should return true.
+    testString: assert(!isBalanced(testCases[14]), '<code>isBalanced("][]][][[")</code> should return true.');
+  - text: <code>isBalanced("][][")</code> should return true.
+    testString: assert(!isBalanced(testCases[15]), '<code>isBalanced("][][")</code> should return true.');
+  - text: <code>isBalanced("[[]]][][][[]][")</code> should return true.
+    testString: assert(!isBalanced(testCases[16]), '<code>isBalanced("[[]]][][][[]][")</code> should return true.');
   - text: <code>isBalanced("")</code> should return true.
-    testString: 'assert(isBalanced(testCases[17]), "<code>isBalanced("")</code> should return true.");'
+    testString: assert(isBalanced(testCases[17]), '<code>isBalanced("")</code> should return true.');
 
 ```
 
@@ -89,7 +89,26 @@ function isBalanced (str) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [
+  '[]',
+  ']][[[][][][]][',
+  '[][[[[][][[[]]]]]]',
+  '][',
+  '[[[]]]][[]',
+  '][[]',
+  '][[][]][[[]]',
+  '[[][]]][',
+  '[[[]]][[]]]][][[',
+  '[]][[]]][[[[][]]',
+  '][]][[][',
+  '[[]][[][]]',
+  '[[]]',
+  ']][]][[]][[[',
+  '][]][][[',
+  '][][',
+  '[[]]][][][[]][',
+  ''
+];
 ```
 
 </div>
@@ -102,12 +121,12 @@ console.info('after the test');
 
 ```js
 function isBalanced (str) {
-  if (str === ") return true;
+  if (str === '') return true;
   let a = str;
   let b;
   do {
     b = a;
-    a = a.replace(/\[\]/g, ");
+    a = a.replace(/\[\]/g, '');
   } while (a !== b);
   return !a;
 }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/circles-of-given-radius-through-two-points.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/circles-of-given-radius-through-two-points.english.md
index 3ea61c922c..ac44b0e989 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/circles-of-given-radius-through-two-points.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/circles-of-given-radius-through-two-points.english.md
@@ -41,17 +41,17 @@ Ref:
 ```yml
 tests:
   - text: <code>getCircles</code> is a function.
-    testString: 'assert(typeof getCircles === "function", "<code>getCircles</code> is a function.");'
-  - text: '<code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 2.0)</code> should return <code>[[1.8631, 1.9742], [-0.8632, -0.7521]]</code>.'
-    testString: 'assert.deepEqual(getCircles(...testCases[0]), answers[0], "<code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 2.0)</code> should return <code>[[1.8631, 1.9742], [-0.8632, -0.7521]]</code>.");'
-  - text: '<code>getCircles([0.0000, 2.0000], [0.0000, 0.0000], 1.0)</code> should return <code>[0, 1]</code>'
-    testString: 'assert.deepEqual(getCircles(...testCases[1]), answers[1], "<code>getCircles([0.0000, 2.0000], [0.0000, 0.0000], 1.0)</code> should return <code>[0, 1]</code>");'
-  - text: '<code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 2.0)</code> should return <code>Coincident point. Infinite solutions</code>'
-    testString: 'assert.deepEqual(getCircles(...testCases[2]), answers[2], "<code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 2.0)</code> should return <code>Coincident point. Infinite solutions</code>");'
-  - text: '<code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 0.5)</code> should return <code>No intersection. Points further apart than circle diameter</code>'
-    testString: 'assert.deepEqual(getCircles(...testCases[3]), answers[3], "<code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 0.5)</code> should return <code>No intersection. Points further apart than circle diameter</code>");'
-  - text: '<code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 0.0)</code> should return <code>Radius Zero</code>'
-    testString: 'assert.deepEqual(getCircles(...testCases[4]), answers[4], "<code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 0.0)</code> should return <code>Radius Zero</code>");'
+    testString: assert(typeof getCircles === 'function', '<code>getCircles</code> is a function.');
+  - text: <code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 2.0)</code> should return <code>[[1.8631, 1.9742], [-0.8632, -0.7521]]</code>.
+    testString: assert.deepEqual(getCircles(...testCases[0]), answers[0], '<code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 2.0)</code> should return <code>[[1.8631, 1.9742], [-0.8632, -0.7521]]</code>.');
+  - text: <code>getCircles([0.0000, 2.0000], [0.0000, 0.0000], 1.0)</code> should return <code>[0, 1]</code>
+    testString: assert.deepEqual(getCircles(...testCases[1]), answers[1], '<code>getCircles([0.0000, 2.0000], [0.0000, 0.0000], 1.0)</code> should return <code>[0, 1]</code>');
+  - text: <code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 2.0)</code> should return <code>Coincident point. Infinite solutions</code>
+    testString: assert.deepEqual(getCircles(...testCases[2]), answers[2], '<code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 2.0)</code> should return <code>Coincident point. Infinite solutions</code>');
+  - text: <code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 0.5)</code> should return <code>No intersection. Points further apart than circle diameter</code>
+    testString: assert.deepEqual(getCircles(...testCases[3]), answers[3], '<code>getCircles([0.1234, 0.9876], [0.8765, 0.2345], 0.5)</code> should return <code>No intersection. Points further apart than circle diameter</code>');
+  - text: <code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 0.0)</code> should return <code>Radius Zero</code>
+    testString: assert.deepEqual(getCircles(...testCases[4]), answers[4], '<code>getCircles([0.1234, 0.9876], [0.1234, 0.9876], 0.0)</code> should return <code>Radius Zero</code>');
 
 ```
 
@@ -76,7 +76,20 @@ function getCircles (...args) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [
+  [[0.1234, 0.9876], [0.8765, 0.2345], 2.0],
+  [[0.0000, 2.0000], [0.0000, 0.0000], 1.0],
+  [[0.1234, 0.9876], [0.1234, 0.9876], 2.0],
+  [[0.1234, 0.9876], [0.8765, 0.2345], 0.5],
+  [[0.1234, 0.9876], [0.1234, 0.9876], 0.0]
+];
+const answers = [
+  [[1.8631, 1.9742], [-0.8632, -0.7521]],
+  [0, 1],
+  'Coincident point. Infinite solutions',
+  'No intersection. Points further apart than circle diameter',
+  'Radius Zero'
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/closest-pair-problem.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/closest-pair-problem.english.md
index 516d0de767..170e0290ac 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/closest-pair-problem.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/closest-pair-problem.english.md
@@ -80,15 +80,15 @@ References and further readings:
 ```yml
 tests:
   - text: <code>getClosestPair</code> is a function.
-    testString: 'assert(typeof getClosestPair === "function", "<code>getClosestPair</code> is a function.");'
+    testString: assert(typeof getClosestPair === 'function', '<code>getClosestPair</code> is a function.');
   - text: Distance should be the following.
-    testString: 'assert.equal(getClosestPair(points1).distance, answer1.distance, "Distance should be the following.");'
+    testString: assert.equal(getClosestPair(points1).distance, answer1.distance, 'Distance should be the following.');
   - text: Points should be the following.
-    testString: 'assert.deepEqual(JSON.parse(JSON.stringify(getClosestPair(points1))).pair, answer1.pair, "Points should be the following.");'
+    testString: assert.deepEqual(JSON.parse(JSON.stringify(getClosestPair(points1))).pair, answer1.pair, 'Points should be the following.');
   - text: Distance should be the following.
-    testString: 'assert.equal(getClosestPair(points2).distance, answer2.distance, "Distance should be the following.");'
+    testString: assert.equal(getClosestPair(points2).distance, answer2.distance, 'Distance should be the following.');
   - text: Points should be the following.
-    testString: 'assert.deepEqual(JSON.parse(JSON.stringify(getClosestPair(points2))).pair, answer2.pair, "Points should be the following.");'
+    testString: assert.deepEqual(JSON.parse(JSON.stringify(getClosestPair(points2))).pair, answer2.pair, 'Points should be the following.');
 
 ```
 
@@ -124,7 +124,107 @@ function getClosestPair (pointsArr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const points1 = [
+	new Point(0.748501, 4.09624),
+	new Point(3.00302, 5.26164),
+	new Point(3.61878,  9.52232),
+	new Point(7.46911,  4.71611),
+	new Point(5.7819,   2.69367),
+	new Point(2.34709,  8.74782),
+	new Point(2.87169,  5.97774),
+	new Point(6.33101,  0.463131),
+	new Point(7.46489,  4.6268),
+	new Point(1.45428,  0.087596)
+];
+
+const points2 = [
+  new Point(37100, 13118),
+  new Point(37134, 1963),
+  new Point(37181, 2008),
+  new Point(37276, 21611),
+  new Point(37307, 9320)
+];
+
+const answer1 = {
+  distance: 0.0894096443343775,
+  pair: [
+    {
+      x: 7.46489,
+      y: 4.6268
+    },
+    {
+      x: 7.46911,
+      y: 4.71611
+    }
+  ]
+};
+
+const answer2 = {
+  distance: 65.06919393998976,
+  pair: [
+    {
+      x: 37134,
+      y: 1963
+    },
+    {
+      x: 37181,
+      y: 2008
+    }
+  ]
+};
+
+const benchmarkPoints = [
+  new Point(16909, 54699),
+  new Point(14773, 61107),
+  new Point(95547, 45344),
+  new Point(95951, 17573),
+  new Point(5824, 41072),
+  new Point(8769, 52562),
+  new Point(21182, 41881),
+  new Point(53226, 45749),
+  new Point(68180, 887),
+  new Point(29322, 44017),
+  new Point(46817, 64975),
+  new Point(10501, 483),
+  new Point(57094, 60703),
+  new Point(23318, 35472),
+  new Point(72452, 88070),
+  new Point(67775, 28659),
+  new Point(19450, 20518),
+  new Point(17314, 26927),
+  new Point(98088, 11164),
+  new Point(25050, 56835),
+  new Point(8364, 6892),
+  new Point(37868, 18382),
+  new Point(23723, 7701),
+  new Point(55767, 11569),
+  new Point(70721, 66707),
+  new Point(31863, 9837),
+  new Point(49358, 30795),
+  new Point(13041, 39745),
+  new Point(59635, 26523),
+  new Point(25859, 1292),
+  new Point(1551, 53890),
+  new Point(70316, 94479),
+  new Point(48549, 86338),
+  new Point(46413, 92747),
+  new Point(27186, 50426),
+  new Point(27591, 22655),
+  new Point(10905, 46153),
+  new Point(40408, 84202),
+  new Point(52821, 73520),
+  new Point(84865, 77388),
+  new Point(99819, 32527),
+  new Point(34404, 75657),
+  new Point(78457, 96615),
+  new Point(42140, 5564),
+  new Point(62175, 92342),
+  new Point(54958, 67112),
+  new Point(4092, 19709),
+  new Point(99415, 60298),
+  new Point(51090, 52158),
+  new Point(48953, 58567)
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/combinations.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/combinations.english.md
index 0b991000ff..8cc3a34f4d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/combinations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/combinations.english.md
@@ -35,11 +35,11 @@ Example:
 ```yml
 tests:
   - text: <code>combinations</code> is a function.
-    testString: 'assert(typeof combinations === "function", "<code>combinations</code> is a function.");'
-  - text: '<code>combinations(3, 5)</code> should return <code>[[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code>.'
-    testString: 'assert.deepEqual(combinations(testInput1[0], testInput1[1]), testOutput1, "<code>combinations(3, 5)</code> should return <code>[[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code>.");'
-  - text: '<code>combinations(4, 6)</code> should return <code>[[0,1,2,3],  [0,1,2,4],  [0,1,2,5],  [0,1,3,4],  [0,1,3,5],  [0,1,4,5],  [0,2,3,4],  [0,2,3,5],  [0,2,4,5],  [0,3,4,5],  [1,2,3,4],  [1,2,3,5],  [1,2,4,5],  [1,3,4,5],  [2,3,4,5]]</code>'
-    testString: 'assert.deepEqual(combinations(testInput2[0], testInput2[1]), testOutput2, "<code>combinations(4, 6)</code> should return <code>[[0,1,2,3],  [0,1,2,4],  [0,1,2,5],  [0,1,3,4],  [0,1,3,5],  [0,1,4,5],  [0,2,3,4],  [0,2,3,5],  [0,2,4,5],  [0,3,4,5],  [1,2,3,4],  [1,2,3,5],  [1,2,4,5],  [1,3,4,5],  [2,3,4,5]]</code>");'
+    testString: assert(typeof combinations === 'function', '<code>combinations</code> is a function.');
+  - text: <code>combinations(3, 5)</code> should return <code>[[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code>.
+    testString: assert.deepEqual(combinations(testInput1[0], testInput1[1]), testOutput1, '<code>combinations(3, 5)</code> should return <code>[[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code>.');
+  - text: <code>combinations(4, 6)</code> should return <code>[[0,1,2,3],  [0,1,2,4],  [0,1,2,5],  [0,1,3,4],  [0,1,3,5],  [0,1,4,5],  [0,2,3,4],  [0,2,3,5],  [0,2,4,5],  [0,3,4,5],  [1,2,3,4],  [1,2,3,5],  [1,2,4,5],  [1,3,4,5],  [2,3,4,5]]</code>
+    testString: assert.deepEqual(combinations(testInput2[0], testInput2[1]), testOutput2, '<code>combinations(4, 6)</code> should return <code>[[0,1,2,3],  [0,1,2,4],  [0,1,2,5],  [0,1,3,4],  [0,1,3,5],  [0,1,4,5],  [0,2,3,4],  [0,2,3,5],  [0,2,4,5],  [0,3,4,5],  [1,2,3,4],  [1,2,3,5],  [1,2,4,5],  [1,3,4,5],  [2,3,4,5]]</code>');
 
 ```
 
@@ -64,7 +64,11 @@ function combinations (m, n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testInput1 = [3, 5];
+const testOutput1 = [[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]];
+
+const testInput2 = [4, 6];
+const testOutput2 = [[0, 1, 2, 3], [0, 1, 2, 4], [0, 1, 2, 5], [0, 1, 3, 4], [0, 1, 3, 5], [0, 1, 4, 5], [0, 2, 3, 4], [0, 2, 3, 5], [0, 2, 4, 5], [0, 3, 4, 5], [1, 2, 3, 4], [1, 2, 3, 5], [1, 2, 4, 5], [1, 3, 4, 5], [2, 3, 4, 5]];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/comma-quibbling.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/comma-quibbling.english.md
index bc78431159..294dd5474c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/comma-quibbling.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/comma-quibbling.english.md
@@ -31,17 +31,17 @@ An input of three or more words, e.g. ["ABC", "DEF", "G", "H"], produces the out
 ```yml
 tests:
   - text: <code>quibble</code> is a function.
-    testString: 'assert(typeof quibble === "function", "<code>quibble</code> is a function.");'
-  - text: '<code>quibble(["ABC"])</code> should return a string.'
-    testString: 'assert(typeof quibble(["ABC"]) === "string", "<code>quibble(["ABC"])</code> should return a string.");'
-  - text: '<code>quibble([])</code> should return "{}".'
-    testString: 'assert.equal(quibble(testCases[0]), results[0], "<code>quibble([])</code> should return "{}".");'
-  - text: '<code>quibble(["ABC"])</code> should return "{ABC}".'
-    testString: 'assert.equal(quibble(testCases[1]), results[1], "<code>quibble(["ABC"])</code> should return "{ABC}".");'
-  - text: '<code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".'
-    testString: 'assert.equal(quibble(testCases[2]), results[2], "<code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".");'
-  - text: '<code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".'
-    testString: 'assert.equal(quibble(testCases[3]), results[3], "<code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".");'
+    testString: assert(typeof quibble === 'function', '<code>quibble</code> is a function.');
+  - text: <code>quibble(["ABC"])</code> should return a string.
+    testString: assert(typeof quibble(["ABC"]) === 'string', '<code>quibble(["ABC"])</code> should return a string.');
+  - text: <code>quibble([])</code> should return "{}".
+    testString: assert.equal(quibble(testCases[0]), results[0], '<code>quibble([])</code> should return "{}".');
+  - text: <code>quibble(["ABC"])</code> should return "{ABC}".
+    testString: assert.equal(quibble(testCases[1]), results[1], '<code>quibble(["ABC"])</code> should return "{ABC}".');
+  - text: <code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".
+    testString: assert.equal(quibble(testCases[2]), results[2], '<code>quibble(["ABC", "DEF"])</code> should return "{ABC and DEF}".');
+  - text: <code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".
+    testString: assert.equal(quibble(testCases[3]), results[3], '<code>quibble(["ABC", "DEF", "G", "H"])</code> should return "{ABC,DEF,G and H}".');
 
 ```
 
@@ -66,7 +66,8 @@ function quibble (words) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [[], ["ABC"], ["ABC", "DEF"], ["ABC", "DEF", "G", "H"]];
+const results = ["{}", "{ABC}", "{ABC and DEF}", "{ABC,DEF,G and H}"];
 ```
 
 </div>
@@ -82,7 +83,7 @@ function quibble (words) {
   return "{" +
     words.slice(0, words.length - 1).join(",") +
    (words.length > 1 ? " and " : "") +
-   (words[words.length - 1] || ") +
+   (words[words.length - 1] || '') +
   "}";
 }
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/compare-a-list-of-strings.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/compare-a-list-of-strings.english.md
index 88174bca5a..0f3d403f4e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/compare-a-list-of-strings.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/compare-a-list-of-strings.english.md
@@ -21,29 +21,29 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>allEqual</code> is a function.
-    testString: 'assert(typeof allEqual === "function", "<code>allEqual</code> is a function.");'
+    testString: assert(typeof allEqual === 'function', '<code>allEqual</code> is a function.');
   - text: <code>azSorted</code> is a function.
-    testString: 'assert(typeof azSorted === "function", "<code>azSorted</code> is a function.");'
-  - text: '<code>allEqual(["AA", "AA", "AA", "AA"])</code> returns true.'
-    testString: 'assert(allEqual(testCases[0]), "<code>allEqual(["AA", "AA", "AA", "AA"])</code> returns true.");'
-  - text: '<code>azSorted(["AA", "AA", "AA", "AA"])</code> returns false.'
-    testString: 'assert(!azSorted(testCases[0]), "<code>azSorted(["AA", "AA", "AA", "AA"])</code> returns false.");'
-  - text: '<code>allEqual(["AA", "ACB", "BB", "CC"])</code> returns false.'
-    testString: 'assert(!allEqual(testCases[1]), "<code>allEqual(["AA", "ACB", "BB", "CC"])</code> returns false.");'
-  - text: '<code>azSorted(["AA", "ACB", "BB", "CC"])</code> returns true.'
-    testString: 'assert(azSorted(testCases[1]), "<code>azSorted(["AA", "ACB", "BB", "CC"])</code> returns true.");'
-  - text: '<code>allEqual([])</code> returns true.'
-    testString: 'assert(allEqual(testCases[2]), "<code>allEqual([])</code> returns true.");'
-  - text: '<code>azSorted([])</code> returns true.'
-    testString: 'assert(azSorted(testCases[2]), "<code>azSorted([])</code> returns true.");'
-  - text: '<code>allEqual(["AA"])</code> returns true.'
-    testString: 'assert(allEqual(testCases[3]), "<code>allEqual(["AA"])</code> returns true.");'
-  - text: '<code>azSorted(["AA"])</code> returns true.'
-    testString: 'assert(azSorted(testCases[3]), "<code>azSorted(["AA"])</code> returns true.");'
-  - text: '<code>allEqual(["BB", "AA"])</code> returns false.'
-    testString: 'assert(!allEqual(testCases[4]), "<code>allEqual(["BB", "AA"])</code> returns false.");'
-  - text: '<code>azSorted(["BB", "AA"])</code> returns false.'
-    testString: 'assert(!azSorted(testCases[4]), "<code>azSorted(["BB", "AA"])</code> returns false.");'
+    testString: assert(typeof azSorted === 'function', '<code>azSorted</code> is a function.');
+  - text: <code>allEqual(["AA", "AA", "AA", "AA"])</code> returns true.
+    testString: assert(allEqual(testCases[0]), '<code>allEqual(["AA", "AA", "AA", "AA"])</code> returns true.');
+  - text: <code>azSorted(["AA", "AA", "AA", "AA"])</code> returns false.
+    testString: assert(!azSorted(testCases[0]), '<code>azSorted(["AA", "AA", "AA", "AA"])</code> returns false.');
+  - text: <code>allEqual(["AA", "ACB", "BB", "CC"])</code> returns false.
+    testString: assert(!allEqual(testCases[1]), '<code>allEqual(["AA", "ACB", "BB", "CC"])</code> returns false.');
+  - text: <code>azSorted(["AA", "ACB", "BB", "CC"])</code> returns true.
+    testString: assert(azSorted(testCases[1]), '<code>azSorted(["AA", "ACB", "BB", "CC"])</code> returns true.');
+  - text: <code>allEqual([])</code> returns true.
+    testString: assert(allEqual(testCases[2]), '<code>allEqual([])</code> returns true.');
+  - text: <code>azSorted([])</code> returns true.
+    testString: assert(azSorted(testCases[2]), '<code>azSorted([])</code> returns true.');
+  - text: <code>allEqual(["AA"])</code> returns true.
+    testString: assert(allEqual(testCases[3]), '<code>allEqual(["AA"])</code> returns true.');
+  - text: <code>azSorted(["AA"])</code> returns true.
+    testString: assert(azSorted(testCases[3]), '<code>azSorted(["AA"])</code> returns true.');
+  - text: <code>allEqual(["BB", "AA"])</code> returns false.
+    testString: assert(!allEqual(testCases[4]), '<code>allEqual(["BB", "AA"])</code> returns false.');
+  - text: <code>azSorted(["BB", "AA"])</code> returns false.
+    testString: assert(!azSorted(testCases[4]), '<code>azSorted(["BB", "AA"])</code> returns false.');
 
 ```
 
@@ -73,7 +73,7 @@ function azSorted (arr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [['AA', 'AA', 'AA', 'AA'], ['AA', 'ACB', 'BB', 'CC'], [], ['AA'], ['BB', 'AA']];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/convert-seconds-to-compound-duration.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/convert-seconds-to-compound-duration.english.md
index d48b3e3fe1..b7c79d6525 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/convert-seconds-to-compound-duration.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/convert-seconds-to-compound-duration.english.md
@@ -82,13 +82,13 @@ However, only include quantities with non-zero values in the output (e.g., retur
 ```yml
 tests:
   - text: <code>convertSeconds</code> is a function.
-    testString: 'assert(typeof convertSeconds === "function", "<code>convertSeconds</code> is a function.");'
-  - text: '<code>convertSeconds(7259)</code> should return <code>2 hr, 59 sec</code>.'
-    testString: 'assert.equal(convertSeconds(testCases[0]), results[0], "<code>convertSeconds(7259)</code> should return <code>2 hr, 59 sec</code>.");'
+    testString: assert(typeof convertSeconds === 'function', '<code>convertSeconds</code> is a function.');
+  - text: <code>convertSeconds(7259)</code> should return <code>2 hr, 59 sec</code>.
+    testString: assert.equal(convertSeconds(testCases[0]), results[0], '<code>convertSeconds(7259)</code> should return <code>2 hr, 59 sec</code>.');
   - text: <code>convertSeconds(86400)</code> should return <code>1 d</code>.
-    testString: 'assert.equal(convertSeconds(testCases[1]), results[1], "<code>convertSeconds(86400)</code> should return <code>1 d</code>.");'
-  - text: '<code>convertSeconds(6000000)</code> should return <code>9 wk, 6 d, 10 hr, 40 min</code>.'
-    testString: 'assert.equal(convertSeconds(testCases[2]), results[2], "<code>convertSeconds(6000000)</code> should return <code>9 wk, 6 d, 10 hr, 40 min</code>.");'
+    testString: assert.equal(convertSeconds(testCases[1]), results[1], '<code>convertSeconds(86400)</code> should return <code>1 d</code>.');
+  - text: <code>convertSeconds(6000000)</code> should return <code>9 wk, 6 d, 10 hr, 40 min</code>.
+    testString: assert.equal(convertSeconds(testCases[2]), results[2], '<code>convertSeconds(6000000)</code> should return <code>9 wk, 6 d, 10 hr, 40 min</code>.');
 
 ```
 
@@ -113,7 +113,8 @@ function convertSeconds (sec) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [7259, 86400, 6000000];
+const results = ['2 hr, 59 sec', '1 d', '9 wk, 6 d, 10 hr, 40 min'];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-occurrences-of-a-substring.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-occurrences-of-a-substring.english.md
index 59cc6ac216..3ecd2715d5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-occurrences-of-a-substring.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-occurrences-of-a-substring.english.md
@@ -25,13 +25,13 @@ the second a substring to be searched for.
 ```yml
 tests:
   - text: <code>countSubstring</code> is a function.
-    testString: 'assert(typeof countSubstring === "function", "<code>countSubstring</code> is a function.");'
-  - text: '<code>countSubstring("the three truths", "th")</code> should return <code>3</code>.'
-    testString: 'assert.equal(countSubstring(testCases[0], searchString[0]), results[0], "<code>countSubstring("the three truths", "th")</code> should return <code>3</code>.");'
-  - text: '<code>countSubstring("ababababab", "abab")</code> should return <code>2</code>.'
-    testString: 'assert.equal(countSubstring(testCases[1], searchString[1]), results[1], "<code>countSubstring("ababababab", "abab")</code> should return <code>2</code>.");'
-  - text: '<code>countSubstring("abaabba*bbaba*bbab", "a*b")</code> should return <code>2</code>.'
-    testString: 'assert.equal(countSubstring(testCases[2], searchString[2]), results[2], "<code>countSubstring("abaabba*bbaba*bbab", "a*b")</code> should return <code>2</code>.");'
+    testString: assert(typeof countSubstring === 'function', '<code>countSubstring</code> is a function.');
+  - text: <code>countSubstring("the three truths", "th")</code> should return <code>3</code>.
+    testString: assert.equal(countSubstring(testCases[0], searchString[0]), results[0], '<code>countSubstring("the three truths", "th")</code> should return <code>3</code>.');
+  - text: <code>countSubstring("ababababab", "abab")</code> should return <code>2</code>.
+    testString: assert.equal(countSubstring(testCases[1], searchString[1]), results[1], '<code>countSubstring("ababababab", "abab")</code> should return <code>2</code>.');
+  - text: <code>countSubstring("abaabba*bbaba*bbab", "a*b")</code> should return <code>2</code>.
+    testString: assert.equal(countSubstring(testCases[2], searchString[2]), results[2], '<code>countSubstring("abaabba*bbaba*bbab", "a*b")</code> should return <code>2</code>.');
 
 ```
 
@@ -56,7 +56,9 @@ function countSubstring (str, subStr) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = ['the three truths', 'ababababab', 'abaabba*bbaba*bbab'];
+const searchString = ['th', 'abab', 'a*b'];
+const results = [3, 2, 2];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-the-coins.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-the-coins.english.md
index 9c8349b4b4..04f3e5d2c4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-the-coins.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/count-the-coins.english.md
@@ -35,9 +35,9 @@ Reference:
 ```yml
 tests:
   - text: <code>countCoins</code> is a function.
-    testString: 'assert(typeof countCoins === "function", "<code>countCoins</code> is a function.");'
+    testString: assert(typeof countCoins === 'function', '<code>countCoins</code> is a function.');
   - text: <code>countCoints()</code> should return 242.
-    testString: 'assert.equal(countCoins(), 242, "<code>countCoints()</code> should return 242.");'
+    testString: assert.equal(countCoins(), 242, '<code>countCoints()</code> should return 242.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/cramers-rule.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/cramers-rule.english.md
index 57e2faef21..c17683e58e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/cramers-rule.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/cramers-rule.english.md
@@ -38,11 +38,11 @@ w+3x+3y-z=-47 \\
 ```yml
 tests:
   - text: <code>cramersRule</code> is a function.
-    testString: 'assert(typeof cramersRule === "function", "<code>cramersRule</code> is a function.");'
-  - text: '<code>cramersRule([[2, -1, 5, 1], [3, 2, 2, -6], [1, 3, 3, -1], [5, -2, -3, 3]], [-3, -32, -47, 49])</code> should return <code>[2, -12, -4, 1]</code>.'
-    testString: 'assert.deepEqual(cramersRule(matrices[0], freeTerms[0]), answers[0], "<code>cramersRule([[2, -1, 5, 1], [3, 2, 2, -6], [1, 3, 3, -1], [5, -2, -3, 3]], [-3, -32, -47, 49])</code> should return <code>[2, -12, -4, 1]</code>.");'
-  - text: '<code>cramersRule([[3, 1, 1], [2, 2, 5], [1, -3, -4]], [3, -1, 2])</code> should return <code>[1, 1, -1]</code>.'
-    testString: 'assert.deepEqual(cramersRule(matrices[1], freeTerms[1]), answers[1], "<code>cramersRule([[3, 1, 1], [2, 2, 5], [1, -3, -4]], [3, -1, 2])</code> should return <code>[1, 1, -1]</code>.");'
+    testString: assert(typeof cramersRule === 'function', '<code>cramersRule</code> is a function.');
+  - text: <code>cramersRule([[2, -1, 5, 1], [3, 2, 2, -6], [1, 3, 3, -1], [5, -2, -3, 3]], [-3, -32, -47, 49])</code> should return <code>[2, -12, -4, 1]</code>.
+    testString: assert.deepEqual(cramersRule(matrices[0], freeTerms[0]), answers[0], '<code>cramersRule([[2, -1, 5, 1], [3, 2, 2, -6], [1, 3, 3, -1], [5, -2, -3, 3]], [-3, -32, -47, 49])</code> should return <code>[2, -12, -4, 1]</code>.');
+  - text: <code>cramersRule([[3, 1, 1], [2, 2, 5], [1, -3, -4]], [3, -1, 2])</code> should return <code>[1, 1, -1]</code>.
+    testString: assert.deepEqual(cramersRule(matrices[1], freeTerms[1]), answers[1], '<code>cramersRule([[3, 1, 1], [2, 2, 5], [1, -3, -4]], [3, -1, 2])</code> should return <code>[1, 1, -1]</code>.');
 
 ```
 
@@ -67,7 +67,22 @@ function cramersRule (matrix, freeTerms) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const matrices = [
+  [
+    [2, -1, 5, 1],
+    [3, 2, 2, -6],
+    [1, 3, 3, -1],
+    [5, -2, -3, 3]
+  ],
+  [
+    [3, 1, 1],
+    [2, 2, 5],
+    [1, -3, -4]
+  ]
+];
+const freeTerms = [[-3, -32, -47, 49], [3, -1, 2]];
+
+const answers = [[2, -12, -4, 1], [1, 1, -1]];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-format.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-format.english.md
index 34d7a88cc3..0d9314cfad 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-format.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-format.english.md
@@ -24,13 +24,13 @@ Task:
 ```yml
 tests:
   - text: <code>getDateFormats</code> is a function.
-    testString: 'assert(typeof getDateFormats === "function", "<code>getDateFormats</code> is a function.");'
+    testString: assert(typeof getDateFormats === 'function', '<code>getDateFormats</code> is a function.');
   - text: Should return an object.
-    testString: 'assert(typeof getDateFormats() === "object", "Should return an object.");'
+    testString: assert(typeof getDateFormats() === 'object', 'Should return an object.');
   - text: Should returned an array with 2 elements.
-    testString: 'assert(getDateFormats().length === 2, "Should returned an array with 2 elements.");'
+    testString: assert(getDateFormats().length === 2, 'Should returned an array with 2 elements.');
   - text: Should return the correct date in the right format
-    testString: 'assert.deepEqual(getDateFormats(), dates, equalsMessage);'
+    testString: assert.deepEqual(getDateFormats(), dates, equalsMessage);
 
 ```
 
@@ -55,7 +55,17 @@ function getDateFormats () {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const getDateSolution = () => {
+  const date = new Date();
+  const weekdays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
+  const months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
+  const fmt1 = `${date.getFullYear()}-${(1 + date.getMonth())}-${date.getDate()}`;
+  const fmt2 = `${weekdays[date.getDay()]}, ${months[date.getMonth()]} ${date.getDate()}, ${date.getFullYear()}`;
+  return [fmt1, fmt2];
+};
+
+const dates = getDateSolution();
+const equalsMessage = `message: <code>getDataFormats()</code> should return <code>["${dates[0]}", "${dates[1]}"]</code>.`;
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-manipulation.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-manipulation.english.md
index e413fdc71e..228952f465 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-manipulation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/date-manipulation.english.md
@@ -26,19 +26,19 @@ Task:
 ```yml
 tests:
   - text: <code>add12Hours</code> is a function.
-    testString: 'assert(typeof add12Hours === "function", "<code>add12Hours</code> is a function.");'
+    testString: assert(typeof add12Hours === 'function', '<code>add12Hours</code> is a function.');
   - text: <code>add12Hours(dateString)</code> should return a string.
-    testString: 'assert(typeof add12Hours(tests[0]) === "string", "<code>add12Hours(dateString)</code> should return a string.");'
-  - text: '<code>add12Hours("" + tests[0] + "")</code> should return <code>"" + answers[0] + ""</code>'
-    testString: 'assert(add12Hours(tests[0]) === answers[0], "<code>add12Hours("" + tests[0] + "")</code> should return <code>"" + answers[0] + ""</code>");'
-  - text: 'Should handel day change. <code>add12Hours("" + tests[1] + "")</code> should return <code>"" + answers[1] + ""</code>'
-    testString: 'assert(add12Hours(tests[1]) === answers[1], "Should handel day change. <code>add12Hours("" + tests[1] + "")</code> should return <code>"" + answers[1] + ""</code>");'
-  - text: 'Should handel month change in a leap years. <code>add12Hours("" + tests[2] + "")</code> should return <code>"" + answers[2] + ""</code>'
-    testString: 'assert(add12Hours(tests[2]) === answers[2], "Should handel month change in a leap years. <code>add12Hours("" + tests[2] + "")</code> should return <code>"" + answers[2] + ""</code>");'
-  - text: 'Should handel month change in a common years. <code>add12Hours("" + tests[3] + "")</code> should return <code>"" + answers[3] + ""</code>'
-    testString: 'assert(add12Hours(tests[3]) === answers[3], "Should handel month change in a common years. <code>add12Hours("" + tests[3] + "")</code> should return <code>"" + answers[3] + ""</code>");'
-  - text: 'Should handel year change. <code>add12Hours("" + tests[4] + "")</code> should return <code>"" + answers[4] + ""</code>'
-    testString: 'assert(add12Hours(tests[4]) === answers[4], "Should handel year change. <code>add12Hours("" + tests[4] + "")</code> should return <code>"" + answers[4] + ""</code>");'
+    testString: assert(typeof add12Hours('January 17 2017 11:43am EST') === 'string', '<code>add12Hours(dateString)</code> should return a string.');
+  - text: <code>add12Hours("January 17 2017 11:43am EST")</code> should return <code>"January 17 2017 11:43pm EST"</code>
+    testString: assert(add12Hours('January 17 2017 11:43am EST') === 'January 17 2017 11:43pm EST', '<code>add12Hours("January 17 2017 11:43am EST")</code> should return <code>"January 17 2017 11:43pm EST"</code>');
+  - text: Should handel day change. <code>add12Hours("March 7 2009 7:30pm EST")</code> should return <code>"March 8 2009 7:30am EST"</code>
+    testString: assert(add12Hours('March 7 2009 7:30pm EST') === 'March 8 2009 7:30am EST', 'Should handel day change. <code>add12Hours("March 7 2009 7:30pm EST")</code> should return <code>"March 8 2009 7:30am EST"</code>');
+  - text: Should handel month change in a leap years. <code>add12Hours("February 29 2004 9:15pm EST")</code> should return <code>"March 1 2004 9:15am EST"</code>
+    testString: assert(add12Hours('February 29 2004 9:15pm EST') === 'March 1 2004 9:15am EST', 'Should handel month change in a leap years. <code>add12Hours("February 29 2004 9:15pm EST")</code> should return <code>"March 1 2004 9:15am EST"</code>');
+  - text: Should handel month change in a common years. <code>add12Hours("February 28 1999 3:15pm EST")</code> should return <code>"March 1 1999 3:15am EST"</code>
+    testString: assert(add12Hours('February 28 1999 3:15pm EST') === 'March 1 1999 3:15am EST', 'Should handel month change in a common years. <code>add12Hours("February 28 1999 3:15pm EST")</code> should return <code>"March 1 1999 3:15am EST"</code>');
+  - text: Should handel year change. <code>add12Hours("December 31 2020 1:45pm EST")</code> should return <code>"January 1 2021 1:45am EST"</code>
+    testString: assert(add12Hours('December 31 2020 1:45pm EST') === 'January 1 2021 1:45am EST', 'Should handel year change. <code>add12Hours("December 31 2020 1:45pm EST")</code> should return <code>"January 1 2021 1:45am EST"</code>');
 
 ```
 
@@ -58,16 +58,6 @@ function add12Hours (dateString) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/day-of-the-week.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/day-of-the-week.english.md
index 68d2f11830..34bb6f18f9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/day-of-the-week.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/day-of-the-week.english.md
@@ -22,13 +22,13 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>findXmasSunday</code> is a function.
-    testString: 'assert(typeof findXmasSunday === "function", "<code>findXmasSunday</code> is a function.");'
-  - text: '<code>findChristmasSunday(2000, 2100)</code> should return an array.'
-    testString: 'assert(typeof findXmasSunday(2000, 2100) === "object", "<code>findChristmasSunday(2000, 2100)</code> should return an array.");'
-  - text: '<code>findChristmasSunday(2008, 2121</code> should return [1977, 1983, 1988, 1994, 2005, 2011, 2016]'
-    testString: 'assert.deepEqual(findXmasSunday(1970, 2017), firstSolution, "<code>findChristmasSunday(2008, 2121</code> should return [1977, 1983, 1988, 1994, 2005, 2011, 2016]");'
-  - text: '<code>findChristmasSunday(2008, 2121</code> should return [2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118]'
-    testString: 'assert.deepEqual(findXmasSunday(2008, 2121), secondSolution, "<code>findChristmasSunday(2008, 2121</code> should return [2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118]");'
+    testString: assert(typeof findXmasSunday === 'function', '<code>findXmasSunday</code> is a function.');
+  - text: <code>findChristmasSunday(2000, 2100)</code> should return an array.
+    testString: assert(typeof findXmasSunday(2000, 2100) === 'object', '<code>findChristmasSunday(2000, 2100)</code> should return an array.');
+  - text: <code>findChristmasSunday(2008, 2121</code> should return [1977, 1983, 1988, 1994, 2005, 2011, 2016]
+    testString: assert.deepEqual(findXmasSunday(1970, 2017), firstSolution, '<code>findChristmasSunday(2008, 2121</code> should return [1977, 1983, 1988, 1994, 2005, 2011, 2016]');
+  - text: <code>findChristmasSunday(2008, 2121</code> should return [2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118]
+    testString: assert.deepEqual(findXmasSunday(2008, 2121), secondSolution, '<code>findChristmasSunday(2008, 2121</code> should return [2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118]');
 
 ```
 
@@ -53,7 +53,8 @@ function findXmasSunday (start, end) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const firstSolution = [1977, 1983, 1988, 1994, 2005, 2011, 2016];
+const secondSolution = [2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deal-cards-for-freecell.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deal-cards-for-freecell.english.md
index 9f6b66c5a7..6985651327 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deal-cards-for-freecell.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deal-cards-for-freecell.english.md
@@ -67,15 +67,15 @@ Task:
 ```yml
 tests:
   - text: <code>dealFreeCell</code> is a function.
-    testString: 'assert(typeof dealFreeCell === "function", "<code>dealFreeCell</code> is a function.");'
+    testString: assert(typeof dealFreeCell === 'function', '<code>dealFreeCell</code> is a function.');
   - text: <code>dealFreeCell(seed)</code> should return an object.
-    testString: 'assert(typeof dealFreeCell(1) === "object", "<code>dealFreeCell(seed)</code> should return an object.");'
+    testString: assert(typeof dealFreeCell(1) === 'object', '<code>dealFreeCell(seed)</code> should return an object.');
   - text: <code>dealFreeCell(seed)</code> should return an array of length 7.
-    testString: 'assert(dealFreeCell(1).length === 7, "<code>dealFreeCell(seed)</code> should return an array of length 7.");'
-  - text: '<code>dealFreeCell(1)</code> should return an array identical to example "Game #1"'
-    testString: 'assert.deepEqual(dealFreeCell(1), game1, "<code>dealFreeCell(1)</code> should return an array identical to example "Game #1"");'
-  - text: '<code>dealFreeCell(617)</code> should return an array identical to example "Game #617"'
-    testString: 'assert.deepEqual(dealFreeCell(617), game617, "<code>dealFreeCell(617)</code> should return an array identical to example "Game #617"");'
+    testString: assert(dealFreeCell(1).length === 7, '<code>dealFreeCell(seed)</code> should return an array of length 7.');
+  - text: "<code>dealFreeCell(1)</code> should return an array identical to example \"Game #1\""
+    testString: "assert.deepEqual(dealFreeCell(1), game1, '<code>dealFreeCell(1)</code> should return an array identical to example \"Game #1\"');"
+  - text: "<code>dealFreeCell(617)</code> should return an array identical to example \"Game #617\""
+    testString: "assert.deepEqual(dealFreeCell(617), game617, '<code>dealFreeCell(617)</code> should return an array identical to example \"Game #617\"');"
 
 ```
 
@@ -100,7 +100,25 @@ function dealFreeCell (seed) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const replaceThis = 3;
+const game1 = [
+  ['JD', '2D', '9H', 'JC', '5D', '7H', '7C', '5H'],
+  ['KD', 'KC', '9S', '5S', 'AD', 'QC', 'KH', '3H'],
+  ['2S', 'KS', '9D', 'QD', 'JS', 'AS', 'AH', '3C'],
+  ['4C', '5C', 'TS', 'QH', '4H', 'AC', '4D', '7S'],
+  ['3S', 'TD', '4S', 'TH', '8H', '2C', 'JH', '7D'],
+  ['6D', '8S', '8D', 'QS', '6C', '3D', '8C', 'TC'],
+  ['6S', '9C', '2H', '6H']
+];
+const game617 = [
+  ['7D', 'AD', '5C', '3S', '5S', '8C', '2D', 'AH'],
+  ['TD', '7S', 'QD', 'AC', '6D', '8H', 'AS', 'KH'],
+  ['TH', 'QC', '3H', '9D', '6S', '8D', '3D', 'TC'],
+  ['KD', '5H', '9S', '3C', '8S', '7H', '4D', 'JS'],
+  ['4C', 'QS', '9C', '9H', '7C', '6H', '2C', '2S'],
+  ['4S', 'TS', '2H', '5D', 'JC', '6C', 'JH', 'QH'],
+  ['JD', 'KS', 'KC', '4H']
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deepcopy.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deepcopy.english.md
index fde981b3ec..da66d0ad1e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deepcopy.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/deepcopy.english.md
@@ -27,15 +27,15 @@ Prototype copying
 ```yml
 tests:
   - text: <code>deepcopy</code> should be a function.
-    testString: 'assert(typeof deepcopy === "function", "<code>deepcopy</code> should be a function.");'
+    testString: assert(typeof deepcopy === 'function', '<code>deepcopy</code> should be a function.');
   - text: '<code>deepcopy({test: "test"})</code> should return an object.'
-    testString: 'assert(typeof deepcopy(obj1) === "object", "<code>deepcopy({test: "test"})</code> should return an object.");'
+    testString: 'assert(typeof deepcopy(obj1) === ''object'', ''<code>deepcopy({test: "test"})</code> should return an object.'');'
   - text: Should not return the same object that was provided.
-    testString: 'assert(deepcopy(obj2) != obj2, "Should not return the same object that was provided.");'
-  - text: 'When passed an object containing an array, should return a deep copy of the object.'
-    testString: 'assert.deepEqual(deepcopy(obj2), obj2, "When passed an object containing an array, should return a deep copy of the object.");'
-  - text: 'When passed an object containing another object, should return a deep copy of the object.'
-    testString: 'assert.deepEqual(deepcopy(obj3), obj3, "When passed an object containing another object, should return a deep copy of the object.");'
+    testString: assert(deepcopy(obj2) != obj2, 'Should not return the same object that was provided.');
+  - text: When passed an object containing an array, should return a deep copy of the object.
+    testString: assert.deepEqual(deepcopy(obj2), obj2, 'When passed an object containing an array, should return a deep copy of the object.');
+  - text: When passed an object containing another object, should return a deep copy of the object.
+    testString: assert.deepEqual(deepcopy(obj3), obj3, 'When passed an object containing another object, should return a deep copy of the object.');
 
 ```
 
@@ -60,7 +60,15 @@ function deepcopy (obj) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const obj1 = { test: 'test' };
+const obj2 = {
+  t: 'test',
+  a: ['an', 'array']
+};
+const obj3 = {
+  t: 'try',
+  o: obj2
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/define-a-primitive-data-type.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/define-a-primitive-data-type.english.md
index b90307836b..d7dd024aa6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/define-a-primitive-data-type.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/define-a-primitive-data-type.english.md
@@ -26,33 +26,33 @@ it should throw a <code>TypeError</code> with an error message of <code>'Not a N
 ```yml
 tests:
   - text: <code>Num</code> should be a function.
-    testString: 'assert(typeof Num === "function", "<code>Num</code> should be a function.");'
+    testString: assert(typeof Num === 'function', '<code>Num</code> should be a function.');
   - text: <code>new Num(4)</code> should return an object.
-    testString: 'assert(typeof (new Num(4)) === "object", "<code>new Num(4)</code> should return an object.");'
+    testString: assert(typeof (new Num(4)) === 'object', '<code>new Num(4)</code> should return an object.');
   - text: <code>new Num(\'test\')</code> should throw a TypeError with message \'Not a Number\'.
-    testString: 'assert(throws(() => new Num("test"), TypeError, "Not a Number"), "<code>new Num(\"test\")</code> should throw a TypeError with message \"Not a Number\".");'
+    testString: assert(throws(() => new Num('test'), TypeError, 'Not a Number'), '<code>new Num(\'test\')</code> should throw a TypeError with message \'Not a Number\'.');
   - text: <code>new Num(0)</code> should throw a TypeError with message \'Out of range\'.
-    testString: 'assert(throws(() => new Num(0), TypeError, "Out of range"), "<code>new Num(0)</code> should throw a TypeError with message \"Out of range\".");'
+    testString: assert(throws(() => new Num(0), TypeError, 'Out of range'), '<code>new Num(0)</code> should throw a TypeError with message \'Out of range\'.');
   - text: <code>new Num(-5)</code> should throw a TypeError with message \'Out of range\'.
-    testString: 'assert(throws(() => new Num(-5), TypeError, "Out of range"), "<code>new Num(-5)</code> should throw a TypeError with message \"Out of range\".");'
+    testString: assert(throws(() => new Num(-5), TypeError, 'Out of range'), '<code>new Num(-5)</code> should throw a TypeError with message \'Out of range\'.');
   - text: <code>new Num(10)</code> should throw a TypeError with message \'Out of range\'.
-    testString: 'assert(throws(() => new Num(11), TypeError, "Out of range"), "<code>new Num(10)</code> should throw a TypeError with message \"Out of range\".");'
+    testString: assert(throws(() => new Num(11), TypeError, 'Out of range'), '<code>new Num(10)</code> should throw a TypeError with message \'Out of range\'.');
   - text: <code>new Num(20)</code> should throw a TypeError with message \'Out of range\'.
-    testString: 'assert(throws(() => new Num(20), TypeError, "Out of range"), "<code>new Num(20)</code> should throw a TypeError with message \"Out of range\".");'
+    testString: assert(throws(() => new Num(20), TypeError, 'Out of range'), '<code>new Num(20)</code> should throw a TypeError with message \'Out of range\'.');
   - text: <code>new Num(3) + new Num(4)</code> should equal 7.
-    testString: 'assert.equal(new Num(3) + new Num(4), 7, "<code>new Num(3) + new Num(4)</code> should equal 7.");'
+    testString: assert.equal(new Num(3) + new Num(4), 7, '<code>new Num(3) + new Num(4)</code> should equal 7.');
   - text: <code>new Num(3) - new Num(4)</code> should equal -1.
-    testString: 'assert.equal(new Num(3) - new Num(4), -1, "<code>new Num(3) - new Num(4)</code> should equal -1.");'
+    testString: assert.equal(new Num(3) - new Num(4), -1, '<code>new Num(3) - new Num(4)</code> should equal -1.');
   - text: <code>new Num(3) * new Num(4)</code> should equal 12.
-    testString: 'assert.equal(new Num(3) * new Num(4), 12, "<code>new Num(3) * new Num(4)</code> should equal 12.");'
+    testString: assert.equal(new Num(3) * new Num(4), 12, '<code>new Num(3) * new Num(4)</code> should equal 12.');
   - text: <code>new Num(3) / new Num(4)</code> should equal 0.75.
-    testString: 'assert.equal(new Num(3) / new Num(4), 0.75, "<code>new Num(3) / new Num(4)</code> should equal 0.75.");'
+    testString: assert.equal(new Num(3) / new Num(4), 0.75, '<code>new Num(3) / new Num(4)</code> should equal 0.75.');
   - text: <code>new Num(3) < new Num(4)</code> should be true.
-    testString: 'assert(new Num(3) < new Num(4), "<code>new Num(3) < new Num(4)</code> should be true.");'
+    testString: assert(new Num(3) < new Num(4), '<code>new Num(3) < new Num(4)</code> should be true.');
   - text: <code>new Num(3) > new Num(4)</code> should be false.
-    testString: 'assert(!(new Num(3) > new Num(4)), "<code>new Num(3) > new Num(4)</code> should be false.");'
+    testString: assert(!(new Num(3) > new Num(4)), '<code>new Num(3) > new Num(4)</code> should be false.');
   - text: <code>(new Num(5)).toString()</code> should return \'5\'
-    testString: 'assert.equal((new Num(5)).toString(), "5", "<code>(new Num(5)).toString()</code> should return \"5\"");'
+    testString: assert.equal((new Num(5)).toString(), '5', '<code>(new Num(5)).toString()</code> should return \'5\'');
 
 ```
 
@@ -97,7 +97,7 @@ Num.prototype.toString = function () { return this._value.toString(); };
 
 function throws(func, errorType, msg) {
   let hasThrown = false;
-  let errorMsg = ";
+  let errorMsg = '';
   let correctType = false;
   try {
     func();
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/department-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/department-numbers.english.md
index 0382778c21..68c95af109 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/department-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/department-numbers.english.md
@@ -40,13 +40,13 @@ Task:
 ```yml
 tests:
   - text: <code>combinations</code> should be a function.
-    testString: 'assert(typeof combinations === "function", "<code>combinations</code> should be a function.");'
-  - text: '<code>combinations([1, 2, 3], 6)</code> should return an Array.'
-    testString: 'assert(Array.isArray(combinations([1, 2, 3], 6)), "<code>combinations([1, 2, 3], 6)</code> should return an Array.");'
-  - text: '<code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return an array of length 14.'
-    testString: 'assert(combinations(nums, total).length === len, "<code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return an array of length 14.");'
-  - text: '<code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return all valid combinations.'
-    testString: 'assert.deepEqual(combinations(nums, total), result, "<code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return all valid combinations.");'
+    testString: assert(typeof combinations === 'function', '<code>combinations</code> should be a function.');
+  - text: <code>combinations([1, 2, 3], 6)</code> should return an Array.
+    testString: assert(Array.isArray(combinations([1, 2, 3], 6)), '<code>combinations([1, 2, 3], 6)</code> should return an Array.');
+  - text: <code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return an array of length 14.
+    testString: assert(combinations(nums, total).length === len, '<code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return an array of length 14.');
+  - text: <code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return all valid combinations.
+    testString: assert.deepEqual(combinations(nums, total), result, '<code>combinations([1, 2, 3, 4, 5, 6, 7], 12)</code> should return all valid combinations.');
 
 ```
 
@@ -71,7 +71,25 @@ function combinations (possibleNumbers, total) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const nums = [1, 2, 3, 4, 5, 6, 7];
+const total = 12;
+const len = 14;
+const result = [
+  [2, 3, 7],
+  [2, 4, 6],
+  [2, 6, 4],
+  [2, 7, 3],
+  [4, 1, 7],
+  [4, 2, 6],
+  [4, 3, 5],
+  [4, 5, 3],
+  [4, 6, 2],
+  [4, 7, 1],
+  [6, 1, 5],
+  [6, 2, 4],
+  [6, 4, 2],
+  [6, 5, 1]
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/discordian-date.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/discordian-date.english.md
index 5fa1165b88..06df3c9693 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/discordian-date.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/discordian-date.english.md
@@ -21,21 +21,21 @@ Task:
 ```yml
 tests:
   - text: <code>discordianDate</code> is a function.
-    testString: 'assert(typeof discordianDate === "function", "<code>discordianDate</code> is a function.");'
-  - text: '<code>discordianDate(new Date(2010, 6, 22))</code> should return <code>"Pungenday, the 57th day of Confusion in the YOLD 3176"</code>.'
-    testString: 'assert(discordianDate(new Date(2010, 6, 22)) === "Pungenday, the 57th day of Confusion in the YOLD 3176", "<code>discordianDate(new Date(2010, 6, 22))</code> should return <code>"Pungenday, the 57th day of Confusion in the YOLD 3176"</code>.");'
-  - text: '<code>discordianDate(new Date(2012, 1, 28))</code> should return <code>"Prickle-Prickle, the 59th day of Chaos in the YOLD 3178"</code>.'
-    testString: 'assert(discordianDate(new Date(2012, 1, 28)) === "Prickle-Prickle, the 59th day of Chaos in the YOLD 3178", "<code>discordianDate(new Date(2012, 1, 28))</code> should return <code>"Prickle-Prickle, the 59th day of Chaos in the YOLD 3178"</code>.");'
-  - text: '<code>discordianDate(new Date(2012, 1, 29))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib\"s Day!"</code>.'
-    testString: 'assert(discordianDate(new Date(2012, 1, 29)) === "Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib\"s Day!", "<code>discordianDate(new Date(2012, 1, 29))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib\"s Day!"</code>.");'
-  - text: '<code>discordianDate(new Date(2012, 2, 1))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178"</code>.'
-    testString: 'assert(discordianDate(new Date(2012, 2, 1)) === "Setting Orange, the 60th day of Chaos in the YOLD 3178", "<code>discordianDate(new Date(2012, 2, 1))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178"</code>.");'
-  - text: '<code>discordianDate(new Date(2010, 0, 5))</code> should return <code>"Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!"</code>.'
-    testString: 'assert(discordianDate(new Date(2010, 0, 5)) === "Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!", "<code>discordianDate(new Date(2010, 0, 5))</code> should return <code>"Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!"</code>.");'
-  - text: '<code>discordianDate(new Date(2011, 4, 3))</code> should return <code>"Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!"</code>.'
-    testString: 'assert(discordianDate(new Date(2011, 4, 3)) === "Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!", "<code>discordianDate(new Date(2011, 4, 3))</code> should return <code>"Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!"</code>.");'
-  - text: '<code>discordianDate(new Date(2015, 9, 19))</code> should return <code>"Boomtime, the 73rd day of Bureaucracy in the YOLD 3181"</code>.'
-    testString: 'assert(discordianDate(new Date(2015, 9, 19)) === "Boomtime, the 73rd day of Bureaucracy in the YOLD 3181", "<code>discordianDate(new Date(2015, 9, 19))</code> should return <code>"Boomtime, the 73rd day of Bureaucracy in the YOLD 3181"</code>.");'
+    testString: assert(typeof discordianDate === 'function', '<code>discordianDate</code> is a function.');
+  - text: <code>discordianDate(new Date(2010, 6, 22))</code> should return <code>"Pungenday, the 57th day of Confusion in the YOLD 3176"</code>.
+    testString: assert(discordianDate(new Date(2010, 6, 22)) === 'Pungenday, the 57th day of Confusion in the YOLD 3176', '<code>discordianDate(new Date(2010, 6, 22))</code> should return <code>"Pungenday, the 57th day of Confusion in the YOLD 3176"</code>.');
+  - text: <code>discordianDate(new Date(2012, 1, 28))</code> should return <code>"Prickle-Prickle, the 59th day of Chaos in the YOLD 3178"</code>.
+    testString: assert(discordianDate(new Date(2012, 1, 28)) === 'Prickle-Prickle, the 59th day of Chaos in the YOLD 3178', '<code>discordianDate(new Date(2012, 1, 28))</code> should return <code>"Prickle-Prickle, the 59th day of Chaos in the YOLD 3178"</code>.');
+  - text: <code>discordianDate(new Date(2012, 1, 29))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib\'s Day!"</code>.
+    testString: assert(discordianDate(new Date(2012, 1, 29)) === 'Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib\'s Day!', '<code>discordianDate(new Date(2012, 1, 29))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib\'s Day!"</code>.');
+  - text: <code>discordianDate(new Date(2012, 2, 1))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178"</code>.
+    testString: assert(discordianDate(new Date(2012, 2, 1)) === 'Setting Orange, the 60th day of Chaos in the YOLD 3178', '<code>discordianDate(new Date(2012, 2, 1))</code> should return <code>"Setting Orange, the 60th day of Chaos in the YOLD 3178"</code>.');
+  - text: <code>discordianDate(new Date(2010, 0, 5))</code> should return <code>"Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!"</code>.
+    testString: assert(discordianDate(new Date(2010, 0, 5)) === 'Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!', '<code>discordianDate(new Date(2010, 0, 5))</code> should return <code>"Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!"</code>.');
+  - text: <code>discordianDate(new Date(2011, 4, 3))</code> should return <code>"Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!"</code>.
+    testString: assert(discordianDate(new Date(2011, 4, 3)) === 'Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!', '<code>discordianDate(new Date(2011, 4, 3))</code> should return <code>"Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!"</code>.');
+  - text: <code>discordianDate(new Date(2015, 9, 19))</code> should return <code>"Boomtime, the 73rd day of Bureaucracy in the YOLD 3181"</code>.
+    testString: assert(discordianDate(new Date(2015, 9, 19)) === 'Boomtime, the 73rd day of Bureaucracy in the YOLD 3181', '<code>discordianDate(new Date(2015, 9, 19))</code> should return <code>"Boomtime, the 73rd day of Bureaucracy in the YOLD 3181"</code>.');
 
 ```
 
@@ -153,12 +153,12 @@ function discordianDate(date) {
           : (seasonDay % 10 === 3) ? 'rd'
                                   : 'th';
 
-  return "
+  return ''
          + dayOfWeek
          + ', the ' + seasonDay + nth
          + ' day of ' + season
          + ' in the YOLD ' + yold
-         + (celebrateHoliday ? '. Celebrate ' + celebrateHoliday + '!' : ")
+         + (celebrateHoliday ? '. Celebrate ' + celebrateHoliday + '!' : '')
     ;
 }
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/element-wise-operations.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/element-wise-operations.english.md
index 1c21ed21b5..6ef38ae64d 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/element-wise-operations.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/element-wise-operations.english.md
@@ -26,21 +26,21 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>operation</code> is a function.
-    testString: 'assert(typeof operation === "function", "<code>operation</code> is a function.");'
-  - text: '<code>operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[2,4],[6,8]]</code>.'
-    testString: 'assert.deepEqual(operation("m_add", [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[2, 4], [6, 8]], "<code>operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[2,4],[6,8]]</code>.");'
-  - text: '<code>operation("s_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[3,4],[5,6]]</code>.'
-    testString: 'assert.deepEqual(operation("s_add", [[1, 2], [3, 4]], 2), [[3, 4], [5, 6]], "<code>operation("s_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[3,4],[5,6]]</code>.");'
-  - text: '<code>operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[0,0],[0,0]]</code>.'
-    testString: 'assert.deepEqual(operation("m_sub", [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[0, 0], [0, 0]], "<code>operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[0,0],[0,0]]</code>.");'
-  - text: '<code>operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[9,16]]</code>.'
-    testString: 'assert.deepEqual(operation("m_mult", [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 4], [9, 16]], "<code>operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[9,16]]</code>.");'
-  - text: '<code>operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,1],[1,1]]</code>.'
-    testString: 'assert.deepEqual(operation("m_div", [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 1], [1, 1]], "<code>operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,1],[1,1]]</code>.");'
-  - text: '<code>operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[27,256]]</code>.'
-    testString: 'assert.deepEqual(operation("m_exp", [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 4], [27, 256]], "<code>operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[27,256]]</code>.");'
-  - text: '<code>operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])</code> should return <code>[[10,12,14,16],[18,20,22,24]]</code>.'
-    testString: 'assert.deepEqual(operation("m_add", [[1, 2, 3, 4], [5, 6, 7, 8]], [[9, 10, 11, 12], [13, 14, 15, 16]]), [[10, 12, 14, 16], [18, 20, 22, 24]], "<code>operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])</code> should return <code>[[10,12,14,16],[18,20,22,24]]</code>.");'
+    testString: assert(typeof operation === 'function', '<code>operation</code> is a function.');
+  - text: <code>operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[2,4],[6,8]]</code>.
+    testString: assert.deepEqual(operation('m_add', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[2, 4], [6, 8]], '<code>operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[2,4],[6,8]]</code>.');
+  - text: <code>operation("s_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[3,4],[5,6]]</code>.
+    testString: assert.deepEqual(operation('s_add', [[1, 2], [3, 4]], 2), [[3, 4], [5, 6]], '<code>operation("s_add",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[3,4],[5,6]]</code>.');
+  - text: <code>operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[0,0],[0,0]]</code>.
+    testString: assert.deepEqual(operation('m_sub', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[0, 0], [0, 0]], '<code>operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[0,0],[0,0]]</code>.');
+  - text: <code>operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[9,16]]</code>.
+    testString: assert.deepEqual(operation('m_mult', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 4], [9, 16]], '<code>operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[9,16]]</code>.');
+  - text: <code>operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,1],[1,1]]</code>.
+    testString: assert.deepEqual(operation('m_div', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 1], [1, 1]], '<code>operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,1],[1,1]]</code>.');
+  - text: <code>operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[27,256]]</code>.
+    testString: assert.deepEqual(operation('m_exp', [[1, 2], [3, 4]], [[1, 2], [3, 4]]), [[1, 4], [27, 256]], '<code>operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])</code> should return <code>[[1,4],[27,256]]</code>.');
+  - text: <code>operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])</code> should return <code>[[10,12,14,16],[18,20,22,24]]</code>.
+    testString: assert.deepEqual(operation('m_add', [[1, 2, 3, 4], [5, 6, 7, 8]], [[9, 10, 11, 12], [13, 14, 15, 16]]), [[10, 12, 14, 16], [18, 20, 22, 24]], '<code>operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])</code> should return <code>[[10,12,14,16],[18,20,22,24]]</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/emirp-primes.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/emirp-primes.english.md
index 1d3743fbf2..491d01cbf5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/emirp-primes.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/emirp-primes.english.md
@@ -21,15 +21,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>emirps</code> is a function.
-    testString: 'assert(typeof emirps === "function", "<code>emirps</code> is a function.");'
-  - text: '<code>emirps(20,true)</code> should return <code>[13,17,31,37,71,73,79,97,107,113,149,157,167,179,199,311,337,347,359,389]</code>'
-    testString: 'assert.deepEqual(emirps(20, true), [13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 311, 337, 347, 359, 389], "<code>emirps(20,true)</code> should return <code>[13,17,31,37,71,73,79,97,107,113,149,157,167,179,199,311,337,347,359,389]</code>");'
+    testString: assert(typeof emirps === 'function', '<code>emirps</code> is a function.');
+  - text: <code>emirps(20,true)</code> should return <code>[13,17,31,37,71,73,79,97,107,113,149,157,167,179,199,311,337,347,359,389]</code>
+    testString: assert.deepEqual(emirps(20, true), [13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 311, 337, 347, 359, 389], '<code>emirps(20,true)</code> should return <code>[13,17,31,37,71,73,79,97,107,113,149,157,167,179,199,311,337,347,359,389]</code>');
   - text: <code>emirps(10000)</code> should return <code>948349</code>
-    testString: 'assert.deepEqual(emirps(10000), 948349, "<code>emirps(10000)</code> should return <code>948349</code>");'
-  - text: '<code>emirps([7700,8000],true)</code> should return <code>[7717,7757,7817,7841,7867,7879,7901,7927,7949,7951,7963]</code>'
-    testString: 'assert.deepEqual(emirps([7700, 8000], true), [7717, 7757, 7817, 7841, 7867, 7879, 7901, 7927, 7949, 7951, 7963], "<code>emirps([7700,8000],true)</code> should return <code>[7717,7757,7817,7841,7867,7879,7901,7927,7949,7951,7963]</code>");'
-  - text: '<code>emirps([7700,8000],true)</code> should return <code>11</code>'
-    testString: 'assert.deepEqual(emirps([7700, 8000], false), 11, "<code>emirps([7700,8000],true)</code> should return <code>11</code>");'
+    testString: assert.deepEqual(emirps(10000), 948349, '<code>emirps(10000)</code> should return <code>948349</code>');
+  - text: <code>emirps([7700,8000],true)</code> should return <code>[7717,7757,7817,7841,7867,7879,7901,7927,7949,7951,7963]</code>
+    testString: assert.deepEqual(emirps([7700, 8000], true), [7717, 7757, 7817, 7841, 7867, 7879, 7901, 7927, 7949, 7951, 7963], '<code>emirps([7700,8000],true)</code> should return <code>[7717,7757,7817,7841,7867,7879,7901,7927,7949,7951,7963]</code>');
+  - text: <code>emirps([7700,8000],true)</code> should return <code>11</code>
+    testString: assert.deepEqual(emirps([7700, 8000], false), 11, '<code>emirps([7700,8000],true)</code> should return <code>11</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/entropy.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/entropy.english.md
index 44e1603f05..ed3b054fa7 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/entropy.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/entropy.english.md
@@ -22,19 +22,19 @@ Task:
 ```yml
 tests:
   - text: <code>entropy</code> is a function.
-    testString: 'assert(typeof entropy === "function", "<code>entropy</code> is a function.");'
+    testString: assert(typeof entropy === 'function', '<code>entropy</code> is a function.');
   - text: <code>entropy("0")</code> should return <code>0</code>
-    testString: 'assert.equal(entropy("0"), 0, "<code>entropy("0")</code> should return <code>0</code>");'
+    testString: assert.equal(entropy('0'), 0, '<code>entropy("0")</code> should return <code>0</code>');
   - text: <code>entropy("01")</code> should return <code>1</code>
-    testString: 'assert.equal(entropy("01"), 1, "<code>entropy("01")</code> should return <code>1</code>");'
+    testString: assert.equal(entropy('01'), 1, '<code>entropy("01")</code> should return <code>1</code>');
   - text: <code>entropy("0123")</code> should return <code>2</code>
-    testString: 'assert.equal(entropy("0123"), 2, "<code>entropy("0123")</code> should return <code>2</code>");'
+    testString: assert.equal(entropy('0123'), 2, '<code>entropy("0123")</code> should return <code>2</code>');
   - text: <code>entropy("01234567")</code> should return <code>3</code>
-    testString: 'assert.equal(entropy("01234567"), 3, "<code>entropy("01234567")</code> should return <code>3</code>");'
+    testString: assert.equal(entropy('01234567'), 3, '<code>entropy("01234567")</code> should return <code>3</code>');
   - text: <code>entropy("0123456789abcdef")</code> should return <code>4</code>
-    testString: 'assert.equal(entropy("0123456789abcdef"), 4, "<code>entropy("0123456789abcdef")</code> should return <code>4</code>");'
+    testString: assert.equal(entropy('0123456789abcdef'), 4, '<code>entropy("0123456789abcdef")</code> should return <code>4</code>');
   - text: <code>entropy("1223334444")</code> should return <code>1.8464393446710154</code>
-    testString: 'assert.equal(entropy("1223334444"), 1.8464393446710154, "<code>entropy("1223334444")</code> should return <code>1.8464393446710154</code>");'
+    testString: assert.equal(entropy('1223334444'), 1.8464393446710154, '<code>entropy("1223334444")</code> should return <code>1.8464393446710154</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/equilibrium-index.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/equilibrium-index.english.md
index e8b903fa77..48a677860f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/equilibrium-index.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/equilibrium-index.english.md
@@ -28,19 +28,19 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>equilibrium</code> is a function.
-    testString: 'assert(typeof equilibrium === "function", "<code>equilibrium</code> is a function.");'
-  - text: '<code>equilibrium([-7, 1, 5, 2, -4, 3, 0])</code> should return <code>[3,6]</code>.'
-    testString: 'assert.deepEqual(equilibrium(tests[0]), ans[0], "<code>equilibrium([-7, 1, 5, 2, -4, 3, 0])</code> should return <code>[3,6]</code>.");'
-  - text: '<code>equilibrium([2, 4, 6])</code> should return <code>[]</code>.'
-    testString: 'assert.deepEqual(equilibrium(tests[1]), ans[1], "<code>equilibrium([2, 4, 6])</code> should return <code>[]</code>.");'
-  - text: '<code>equilibrium([2, 9, 2])</code> should return <code>[1]</code>.'
-    testString: 'assert.deepEqual(equilibrium(tests[2]), ans[2], "<code>equilibrium([2, 9, 2])</code> should return <code>[1]</code>.");'
-  - text: '<code>equilibrium([1, -1, 1, -1, 1, -1, 1])</code> should return <code>[0,1,2,3,4,5,6]</code>.'
-    testString: 'assert.deepEqual(equilibrium(tests[3]), ans[3], "<code>equilibrium([1, -1, 1, -1, 1, -1, 1])</code> should return <code>[0,1,2,3,4,5,6]</code>.");'
-  - text: '<code>equilibrium([1])</code> should return <code>[0]</code>.'
-    testString: 'assert.deepEqual(equilibrium(tests[4]), ans[4], "<code>equilibrium([1])</code> should return <code>[0]</code>.");'
-  - text: '<code>equilibrium([])</code> should return <code>[]</code>.'
-    testString: 'assert.deepEqual(equilibrium(tests[5]), ans[5], "<code>equilibrium([])</code> should return <code>[]</code>.");'
+    testString: assert(typeof equilibrium === 'function', '<code>equilibrium</code> is a function.');
+  - text: <code>equilibrium([-7, 1, 5, 2, -4, 3, 0])</code> should return <code>[3,6]</code>.
+    testString: assert.deepEqual(equilibrium(equilibriumTests[0]), ans[0], '<code>equilibrium([-7, 1, 5, 2, -4, 3, 0])</code> should return <code>[3,6]</code>.');
+  - text: <code>equilibrium([2, 4, 6])</code> should return <code>[]</code>.
+    testString: assert.deepEqual(equilibrium(equilibriumTests[1]), ans[1], '<code>equilibrium([2, 4, 6])</code> should return <code>[]</code>.');
+  - text: <code>equilibrium([2, 9, 2])</code> should return <code>[1]</code>.
+    testString: assert.deepEqual(equilibrium(equilibriumTests[2]), ans[2], '<code>equilibrium([2, 9, 2])</code> should return <code>[1]</code>.');
+  - text: <code>equilibrium([1, -1, 1, -1, 1, -1, 1])</code> should return <code>[0,1,2,3,4,5,6]</code>.
+    testString: assert.deepEqual(equilibrium(equilibriumTests[3]), ans[3], '<code>equilibrium([1, -1, 1, -1, 1, -1, 1])</code> should return <code>[0,1,2,3,4,5,6]</code>.');
+  - text: <code>equilibrium([1])</code> should return <code>[0]</code>.
+    testString: assert.deepEqual(equilibrium(equilibriumTests[4]), ans[4], '<code>equilibrium([1])</code> should return <code>[0]</code>.');
+  - text: <code>equilibrium([])</code> should return <code>[]</code>.
+    testString: assert.deepEqual(equilibrium(equilibriumTests[5]), ans[5], '<code>equilibrium([])</code> should return <code>[]</code>.');
 
 ```
 
@@ -64,7 +64,15 @@ function equilibrium (a) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const equilibriumTests =
+  [[-7, 1, 5, 2, -4, 3, 0], // 3, 6
+  [2, 4, 6], // empty
+  [2, 9, 2], // 1
+  [1, -1, 1, -1, 1, -1, 1], // 0,1,2,3,4,5,6
+  [1], // 0
+  [] // empty
+  ];
+const ans = [[3, 6], [], [1], [0, 1, 2, 3, 4, 5, 6], [0], []];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ethiopian-multiplication.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ethiopian-multiplication.english.md
index b69bc1c206..a84aac3a80 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ethiopian-multiplication.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/ethiopian-multiplication.english.md
@@ -61,17 +61,17 @@ one to state if an integer is even.
 ```yml
 tests:
   - text: <code>eth_mult</code> is a function.
-    testString: 'assert(typeof eth_mult === "function", "<code>eth_mult</code> is a function.");'
-  - text: '<code>eth_mult(17,34)</code> should return <code>578</code>.'
-    testString: 'assert.equal(eth_mult(17, 34), 578, "<code>eth_mult(17,34)</code> should return <code>578</code>.");'
-  - text: '<code>eth_mult(23,46)</code> should return <code>1058</code>.'
-    testString: 'assert.equal(eth_mult(23, 46), 1058, "<code>eth_mult(23,46)</code> should return <code>1058</code>.");'
-  - text: '<code>eth_mult(12,27)</code> should return <code>324</code>.'
-    testString: 'assert.equal(eth_mult(12, 27), 324, "<code>eth_mult(12,27)</code> should return <code>324</code>.");'
-  - text: '<code>eth_mult(56,98)</code> should return <code>5488</code>.'
-    testString: 'assert.equal(eth_mult(56, 98), 5488, "<code>eth_mult(56,98)</code> should return <code>5488</code>.");'
-  - text: '<code>eth_mult(63,74)</code> should return <code>4662</code>.'
-    testString: 'assert.equal(eth_mult(63, 74), 4662, "<code>eth_mult(63,74)</code> should return <code>4662</code>.");'
+    testString: assert(typeof eth_mult === 'function', '<code>eth_mult</code> is a function.');
+  - text: <code>eth_mult(17,34)</code> should return <code>578</code>.
+    testString: assert.equal(eth_mult(17, 34), 578, '<code>eth_mult(17,34)</code> should return <code>578</code>.');
+  - text: <code>eth_mult(23,46)</code> should return <code>1058</code>.
+    testString: assert.equal(eth_mult(23, 46), 1058, '<code>eth_mult(23,46)</code> should return <code>1058</code>.');
+  - text: <code>eth_mult(12,27)</code> should return <code>324</code>.
+    testString: assert.equal(eth_mult(12, 27), 324, '<code>eth_mult(12,27)</code> should return <code>324</code>.');
+  - text: <code>eth_mult(56,98)</code> should return <code>5488</code>.
+    testString: assert.equal(eth_mult(56, 98), 5488, '<code>eth_mult(56,98)</code> should return <code>5488</code>.');
+  - text: <code>eth_mult(63,74)</code> should return <code>4662</code>.
+    testString: assert.equal(eth_mult(63, 74), 4662, '<code>eth_mult(63,74)</code> should return <code>4662</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/euler-method.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/euler-method.english.md
index ada6069ce5..cc08c7ff1c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/euler-method.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/euler-method.english.md
@@ -36,15 +36,15 @@ Initial values:
 ```yml
 tests:
   - text: <code>eulersMethod</code> is a function.
-    testString: 'assert(typeof eulersMethod === "function", "<code>eulersMethod</code> is a function.");'
-  - text: '<code>eulersMethod(0, 100, 100, 10)</code> should return a number.'
-    testString: 'assert(typeof eulersMethod(0, 100, 100, 10) === "number", "<code>eulersMethod(0, 100, 100, 10)</code> should return a number.");'
-  - text: '<code>eulersMethod(0, 100, 100, 10)</code> should return 20.0424631833732.'
-    testString: 'assert.equal(eulersMethod(0, 100, 100, 2), 20.0424631833732, "<code>eulersMethod(0, 100, 100, 10)</code> should return 20.0424631833732.");'
-  - text: '<code>eulersMethod(0, 100, 100, 10)</code> should return 20.01449963666907.'
-    testString: 'assert.equal(eulersMethod(0, 100, 100, 5), 20.01449963666907, "<code>eulersMethod(0, 100, 100, 10)</code> should return 20.01449963666907.");'
-  - text: '<code>eulersMethod(0, 100, 100, 10)</code> should return 20.000472392.'
-    testString: 'assert.equal(eulersMethod(0, 100, 100, 10), 20.000472392, "<code>eulersMethod(0, 100, 100, 10)</code> should return 20.000472392.");'
+    testString: assert(typeof eulersMethod === 'function', '<code>eulersMethod</code> is a function.');
+  - text: <code>eulersMethod(0, 100, 100, 10)</code> should return a number.
+    testString: assert(typeof eulersMethod(0, 100, 100, 10) === 'number', '<code>eulersMethod(0, 100, 100, 10)</code> should return a number.');
+  - text: <code>eulersMethod(0, 100, 100, 10)</code> should return 20.0424631833732.
+    testString: assert.equal(eulersMethod(0, 100, 100, 2), 20.0424631833732, '<code>eulersMethod(0, 100, 100, 10)</code> should return 20.0424631833732.');
+  - text: <code>eulersMethod(0, 100, 100, 10)</code> should return 20.01449963666907.
+    testString: assert.equal(eulersMethod(0, 100, 100, 5), 20.01449963666907, '<code>eulersMethod(0, 100, 100, 10)</code> should return 20.01449963666907.');
+  - text: <code>eulersMethod(0, 100, 100, 10)</code> should return 20.000472392.
+    testString: assert.equal(eulersMethod(0, 100, 100, 10), 20.000472392, '<code>eulersMethod(0, 100, 100, 10)</code> should return 20.000472392.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/evaluate-binomial-coefficients.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/evaluate-binomial-coefficients.english.md
index 2ea0225754..b0058c0c73 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/evaluate-binomial-coefficients.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/evaluate-binomial-coefficients.english.md
@@ -21,17 +21,17 @@ $\binom{n}{k} = \frac{n!}{(n-k)!k!} = \frac{n(n-1)(n-2)\ldots(n-k+1)}{k(k-1)(k-2
 ```yml
 tests:
   - text: <code>binom</code> is a function.
-    testString: 'assert(typeof binom === "function", "<code>binom</code> is a function.");'
-  - text: '<code>binom(5,3)</code> should return 10.'
-    testString: 'assert.equal(binom(5, 3), 10, "<code>binom(5,3)</code> should return 10.");'
-  - text: '<code>binom(7,2)</code> should return 21.'
-    testString: 'assert.equal(binom(7, 2), 21, "<code>binom(7,2)</code> should return 21.");'
-  - text: '<code>binom(10,4)</code> should return 210.'
-    testString: 'assert.equal(binom(10, 4), 210, "<code>binom(10,4)</code> should return 210.");'
-  - text: '<code>binom(6,1)</code> should return 6.'
-    testString: 'assert.equal(binom(6, 1), 6, "<code>binom(6,1)</code> should return 6.");'
-  - text: '<code>binom(12,8)</code> should return 495.'
-    testString: 'assert.equal(binom(12, 8), 495, "<code>binom(12,8)</code> should return 495.");'
+    testString: assert(typeof binom === 'function', '<code>binom</code> is a function.');
+  - text: <code>binom(5,3)</code> should return 10.
+    testString: assert.equal(binom(5, 3), 10, '<code>binom(5,3)</code> should return 10.');
+  - text: <code>binom(7,2)</code> should return 21.
+    testString: assert.equal(binom(7, 2), 21, '<code>binom(7,2)</code> should return 21.');
+  - text: <code>binom(10,4)</code> should return 210.
+    testString: assert.equal(binom(10, 4), 210, '<code>binom(10,4)</code> should return 210.');
+  - text: <code>binom(6,1)</code> should return 6.
+    testString: assert.equal(binom(6, 1), 6, '<code>binom(6,1)</code> should return 6.');
+  - text: <code>binom(12,8)</code> should return 495.
+    testString: assert.equal(binom(12, 8), 495, '<code>binom(12,8)</code> should return 495.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-a-markov-algorithm.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-a-markov-algorithm.english.md
index 69d47cf83c..920dc4be7a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-a-markov-algorithm.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-a-markov-algorithm.english.md
@@ -124,17 +124,17 @@ state C, symbol 1 => write 1, move left, halt0C1 -> H01
 ```yml
 tests:
   - text: <code>markov</code> is a function.
-    testString: 'assert(typeof markov === "function", "<code>markov</code> is a function.");'
-  - text: '<code>markov(["A -> apple","B -> bag","S -> shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from my brother.".'
-    testString: 'assert.deepEqual(markov(rules[0],tests[0]),outputs[0],"<code>markov(["A -> apple","B -> bag","S -> shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from my brother.".");'
-  - text: '<code>markov(["A -> apple","B -> bag","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from T shop.".'
-    testString: 'assert.deepEqual(markov(rules[1],tests[1]),outputs[1],"<code>markov(["A -> apple","B -> bag","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from T shop.".");'
-  - text: '<code>markov(["A -> apple","WWWW -> with","Bgage -> ->.*","B -> bag","->.* -> money","W -> WW","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As W my Bgage from T S.")</code> should return "I bought a bag of apples with my money from T shop.".'
-    testString: 'assert.deepEqual(markov(rules[2],tests[2]),outputs[2],"<code>markov(["A -> apple","WWWW -> with","Bgage -> ->.*","B -> bag","->.* -> money","W -> WW","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As W my Bgage from T S.")</code> should return "I bought a bag of apples with my money from T shop.".");'
-  - text: '<code>markov(["_+1 -> _1+","1+1 -> 11+","1! -> !1",",! -> !+","_! -> _","1*1 -> x,@y","1x -> xX","X, -> 1,1","X1 -> 1X","_x -> _X",",x -> ,X","y1 -> 1y","y_ -> _","1@1 -> x,@y","1@_ -> @_",",@_ -> !_","++ -> +","_1 -> 1","1+_ -> 1","_+_ -> "],"_1111*11111_")</code> should return "11111111111111111111".'
-    testString: 'assert.deepEqual(markov(rules[3],tests[3]),outputs[3],"<code>markov(["_+1 -> _1+","1+1 -> 11+","1! -> !1",",! -> !+","_! -> _","1*1 -> x,@y","1x -> xX","X, -> 1,1","X1 -> 1X","_x -> _X",",x -> ,X","y1 -> 1y","y_ -> _","1@1 -> x,@y","1@_ -> @_",",@_ -> !_","++ -> +","_1 -> 1","1+_ -> 1","_+_ -> "],"_1111*11111_")</code> should return "11111111111111111111".");'
-  - text: '<code>markov(["A0 -> 1B","0A1 -> C01","1A1 -> C11","0B0 -> A01","1B0 -> A11","B1 -> 1B","0C0 -> B01","1C0 -> B11","0C1 -> H01","1C1 -> H11"],"")</code> should return "00011H1111000".'
-    testString: 'assert.deepEqual(markov(rules[4],tests[4]),outputs[4],"<code>markov(["A0 -> 1B","0A1 -> C01","1A1 -> C11","0B0 -> A01","1B0 -> A11","B1 -> 1B","0C0 -> B01","1C0 -> B11","0C1 -> H01","1C1 -> H11"],"")</code> should return "00011H1111000".");'
+    testString: assert(typeof markov === 'function', '<code>markov</code> is a function.');
+  - text: <code>markov(["A -> apple","B -> bag","S -> shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from my brother.".
+    testString: assert.deepEqual(markov(rules[0],tests[0]),outputs[0],'<code>markov(["A -> apple","B -> bag","S -> shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from my brother.".');
+  - text: <code>markov(["A -> apple","B -> bag","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from T shop.".
+    testString: assert.deepEqual(markov(rules[1],tests[1]),outputs[1],'<code>markov(["A -> apple","B -> bag","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As from T S.")</code> should return "I bought a bag of apples from T shop.".');
+  - text: <code>markov(["A -> apple","WWWW -> with","Bgage -> ->.*","B -> bag","->.* -> money","W -> WW","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As W my Bgage from T S.")</code> should return "I bought a bag of apples with my money from T shop.".
+    testString: assert.deepEqual(markov(rules[2],tests[2]),outputs[2],'<code>markov(["A -> apple","WWWW -> with","Bgage -> ->.*","B -> bag","->.* -> money","W -> WW","S -> .shop","T -> the","the shop -> my brother","a never used -> .terminating rule"],"I bought a B of As W my Bgage from T S.")</code> should return "I bought a bag of apples with my money from T shop.".');
+  - text: <code>markov(["_+1 -> _1+","1+1 -> 11+","1! -> !1",",! -> !+","_! -> _","1*1 -> x,@y","1x -> xX","X, -> 1,1","X1 -> 1X","_x -> _X",",x -> ,X","y1 -> 1y","y_ -> _","1@1 -> x,@y","1@_ -> @_",",@_ -> !_","++ -> +","_1 -> 1","1+_ -> 1","_+_ -> "],"_1111*11111_")</code> should return "11111111111111111111".
+    testString: assert.deepEqual(markov(rules[3],tests[3]),outputs[3],'<code>markov(["_+1 -> _1+","1+1 -> 11+","1! -> !1",",! -> !+","_! -> _","1*1 -> x,@y","1x -> xX","X, -> 1,1","X1 -> 1X","_x -> _X",",x -> ,X","y1 -> 1y","y_ -> _","1@1 -> x,@y","1@_ -> @_",",@_ -> !_","++ -> +","_1 -> 1","1+_ -> 1","_+_ -> "],"_1111*11111_")</code> should return "11111111111111111111".');
+  - text: <code>markov(["A0 -> 1B","0A1 -> C01","1A1 -> C11","0B0 -> A01","1B0 -> A11","B1 -> 1B","0C0 -> B01","1C0 -> B11","0C1 -> H01","1C1 -> H11"],"")</code> should return "00011H1111000".
+    testString: assert.deepEqual(markov(rules[4],tests[4]),outputs[4],'<code>markov(["A0 -> 1B","0A1 -> C01","1A1 -> C11","0B0 -> A01","1B0 -> A11","B1 -> 1B","0C0 -> B01","1C0 -> B11","0C1 -> H01","1C1 -> H11"],"")</code> should return "00011H1111000".');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-brain.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-brain.english.md
index 93c4ea0b7b..d04dab2093 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-brain.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/execute-brain.english.md
@@ -43,15 +43,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>brain(bye)</code> should retuen a string
-    testString: 'assert(typeof brain(bye) === "string", "<code>brain(bye)</code> should return a string");'
-  - text: '<code>brain("++++++[>++++++++++<-]>+++++.")</code should return "A"'
-    testString: 'assert.equal(brain("++++++[>++++++++++<-]>+++++."),"A", "<code>brain("++++++[>++++++++++<-]>+++++.")</code should return "A"");'
-  - text: '<code>brain(bye)</code> should return <code>Goodbye, World!\\r\\n</code>'
-    testString: 'assert.equal(brain(bye), "Goodbye, World!\r\n", "<code>brain(bye)</code> should return <code>Goodbye, World!\\r\\n</code>");'
+    testString: assert(typeof brain(bye) === 'string', '<code>brain(bye)</code> should return a string');
+  - text: <code>brain("++++++[>++++++++++<-]>+++++.")</code should return "A"
+    testString: assert.equal(brain("++++++[>++++++++++<-]>+++++."),"A", '<code>brain("++++++[>++++++++++<-]>+++++.")</code should return "A"');
+  - text: <code>brain(bye)</code> should return <code>Goodbye, World!\\r\\n</code>
+    testString: assert.equal(brain(bye), 'Goodbye, World!\r\n', '<code>brain(bye)</code> should return <code>Goodbye, World!\\r\\n</code>');
   - text: <code>brain(hello)</code> should return <code>Hello World!\\n</code>'
-    testString: 'assert.equal(brain(hello), "Hello World!\n", "<code>brain(hello)</code> should return <code>Hello World!\\n</code>");'
-  - text: '<code>brain(fib)</code> should return <code>1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89</code>'
-    testString: 'assert.equal(brain(fib), "1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89", "<code>brain(fib)</code> should return <code>1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89</code>");'
+    testString: assert.equal(brain(hello), "Hello World!\n", '<code>brain(hello)</code> should return <code>Hello World!\\n</code>');
+  - text: <code>brain(fib)</code> should return <code>1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89</code>
+    testString: assert.equal(brain(fib), "1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89", '<code>brain(fib)</code> should return <code>1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/extensible-prime-generator.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/extensible-prime-generator.english.md
index df2f4b4bf9..8924db78de 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/extensible-prime-generator.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/extensible-prime-generator.english.md
@@ -20,15 +20,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>primeGenerator</code> is a function.
-    testString: 'assert(typeof primeGenerator === "function", "<code>primeGenerator</code> is a function.");'
+    testString: assert(typeof primeGenerator === 'function', '<code>primeGenerator</code> is a function.');
   - text: <code>primeGenerator</code> is a function.
-    testString: 'assert.deepEqual(primeGenerator(20, true), [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71], "<code>primeGenerator</code> is a function.");'
+    testString: assert.deepEqual(primeGenerator(20, true), [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71], '<code>primeGenerator</code> is a function.');
   - text: <code>primeGenerator</code> is a function.
-    testString: 'assert.deepEqual(primeGenerator([100, 150], true), [101, 103, 107, 109, 113, 127, 131, 137, 139, 149], "<code>primeGenerator</code> is a function.");'
+    testString: assert.deepEqual(primeGenerator([100, 150], true), [101, 103, 107, 109, 113, 127, 131, 137, 139, 149], '<code>primeGenerator</code> is a function.');
   - text: <code>primeGenerator</code> is a function.
-    testString: 'assert.equal(primeGenerator([7700, 8000], false), 30, "<code>primeGenerator</code> is a function.");'
+    testString: assert.equal(primeGenerator([7700, 8000], false), 30, '<code>primeGenerator</code> is a function.');
   - text: <code>primeGenerator</code> is a function.
-    testString: 'assert.equal(primeGenerator(10000, false), 104729, "<code>primeGenerator</code> is a function.");'
+    testString: assert.equal(primeGenerator(10000, false), 104729, '<code>primeGenerator</code> is a function.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factorial.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factorial.english.md
index 9bce51d883..f1ce577255 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factorial.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factorial.english.md
@@ -30,15 +30,15 @@ For example :
 ```yml
 tests:
   - text: <code>factorial</code> is a function.
-    testString: 'assert(typeof factorial === "function", "<code>factorial</code> is a function.");'
+    testString: assert(typeof factorial === 'function', '<code>factorial</code> is a function.');
   - text: <code>factorial(2)</code> should return a number.
-    testString: 'assert(typeof factorial(2) === "number", "<code>factorial(2)</code> should return a number.");'
+    testString: assert(typeof factorial(2) === 'number', '<code>factorial(2)</code> should return a number.');
   - text: <code>factorial(3)</code> should return 6.")
-    testString: 'assert.equal(factorial(3),results[0],"<code>factorial(3)</code> should return 6.");'
+    testString: assert.equal(factorial(3),results[0],"<code>factorial(3)</code> should return 6.");
   - text: <code>factorial(3)</code> should return 120.")
-    testString: 'assert.equal(factorial(5),results[1],"<code>factorial(3)</code> should return 120.");'
-  - text: '<code>factorial(3)</code> should return 3,628,800.")'
-    testString: 'assert.equal(factorial(10),results[2],"<code>factorial(3)</code> should return 3,628,800.");'
+    testString: assert.equal(factorial(5),results[1],"<code>factorial(3)</code> should return 120.");
+  - text: <code>factorial(3)</code> should return 3,628,800.")
+    testString: assert.equal(factorial(10),results[2],"<code>factorial(3)</code> should return 3,628,800.");
 
 ```
 
@@ -62,7 +62,7 @@ function factorial (n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const results=[6,120,3628800];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-a-mersenne-number.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-a-mersenne-number.english.md
index e371bb3ffd..db4f490a76 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-a-mersenne-number.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-a-mersenne-number.english.md
@@ -50,15 +50,15 @@ Related tasks:
 ```yml
 tests:
   - text: <code>check_mersenne</code> is a function.
-    testString: 'assert(typeof check_mersenne === "function", "<code>check_mersenne</code> is a function.");'
+    testString: assert(typeof check_mersenne === 'function', '<code>check_mersenne</code> is a function.');
   - text: <code>check_mersenne(3)</code> should return a string.
-    testString: 'assert(typeof check_mersenne(3) == "string", "<code>check_mersenne(3)</code> should return a string.");'
+    testString: assert(typeof check_mersenne(3) == 'string', '<code>check_mersenne(3)</code> should return a string.');
   - text: <code>check_mersenne(3)</code> should return "M3 = 2^3-1 is prime".
-    testString: 'assert.equal(check_mersenne(3),"M3 = 2^3-1 is prime","<code>check_mersenne(3)</code> should return "M3 = 2^3-1 is prime".");'
+    testString: assert.equal(check_mersenne(3),"M3 = 2^3-1 is prime",'<code>check_mersenne(3)</code> should return "M3 = 2^3-1 is prime".');
   - text: <code>check_mersenne(23)</code> should return "M23 = 2^23-1 is composite with factor 47".
-    testString: 'assert.equal(check_mersenne(23),"M23 = 2^23-1 is composite with factor 47","<code>check_mersenne(23)</code> should return "M23 = 2^23-1 is composite with factor 47".");'
+    testString: assert.equal(check_mersenne(23),"M23 = 2^23-1 is composite with factor 47",'<code>check_mersenne(23)</code> should return "M23 = 2^23-1 is composite with factor 47".');
   - text: <code>check_mersenne(929)</code> should return "M929 = 2^929-1 is composite with factor 13007
-    testString: 'assert.equal(check_mersenne(929),"M929 = 2^929-1 is composite with factor 13007","<code>check_mersenne(929)</code> should return "M929 = 2^929-1 is composite with factor 13007");'
+    testString: assert.equal(check_mersenne(929),"M929 = 2^929-1 is composite with factor 13007",'<code>check_mersenne(929)</code> should return "M929 = 2^929-1 is composite with factor 13007');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-an-integer.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-an-integer.english.md
index 03b40b02ef..6c38f965ba 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-an-integer.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/factors-of-an-integer.english.md
@@ -21,13 +21,13 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>factors</code> is a function.
-    testString: 'assert(typeof factors === "function", "<code>factors</code> is a function.");'
-  - text: '<code>factors(45)</code> should return <code>[1,3,5,9,15,45]</code>.'
-    testString: 'assert.deepEqual(factors(45), ans[0], "<code>factors(45)</code> should return <code>[1,3,5,9,15,45]</code>.");'
-  - text: '<code>factors(53)</code> should return <code>[1,53]</code>.'
-    testString: 'assert.deepEqual(factors(53), ans[1], "<code>factors(53)</code> should return <code>[1,53]</code>.");'
-  - text: '<code>factors(64)</code> should return <code>[1,2,4,8,16,32,64]</code>.'
-    testString: 'assert.deepEqual(factors(64), ans[2], "<code>factors(64)</code> should return <code>[1,2,4,8,16,32,64]</code>.");'
+    testString: assert(typeof factors === 'function', '<code>factors</code> is a function.');
+  - text: <code>factors(45)</code> should return <code>[1,3,5,9,15,45]</code>.
+    testString: assert.deepEqual(factors(45), ans[0], '<code>factors(45)</code> should return <code>[1,3,5,9,15,45]</code>.');
+  - text: <code>factors(53)</code> should return <code>[1,53]</code>.
+    testString: assert.deepEqual(factors(53), ans[1], '<code>factors(53)</code> should return <code>[1,53]</code>.');
+  - text: <code>factors(64)</code> should return <code>[1,2,4,8,16,32,64]</code>.
+    testString: assert.deepEqual(factors(64), ans[2], '<code>factors(64)</code> should return <code>[1,2,4,8,16,32,64]</code>.');
 
 ```
 
@@ -51,7 +51,7 @@ function factors (num) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const ans=[[1,3,5,9,15,45],[1,53],[1,2,4,8,16,32,64]];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/farey-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/farey-sequence.english.md
index b1a7a6d9bb..a0b3d0593e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/farey-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/farey-sequence.english.md
@@ -32,15 +32,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>farey</code> is a function.
-    testString: 'assert(typeof farey === "function", "<code>farey</code> is a function.");'
+    testString: assert(typeof farey === 'function', '<code>farey</code> is a function.');
   - text: <code>farey(3)</code> should return an array
-    testString: 'assert(Array.isArray(farey(3)), "<code>farey(3)</code> should return an array");'
-  - text: '<code>farey(3)</code> should return <code>["1/3","1/2","2/3"]</code>'
-    testString: 'assert.deepEqual(farey(3), ["1/3","1/2","2/3"], "<code>farey(3)</code> should return <code>["1/3","1/2","2/3"]</code>");'
-  - text: '<code>farey(4)</code> should return <code>["1/4","1/3","1/2","2/4","2/3","3/4"]</code>'
-    testString: 'assert.deepEqual(farey(4), ["1/4","1/3","1/2","2/4","2/3","3/4"], "<code>farey(4)</code> should return <code>["1/4","1/3","1/2","2/4","2/3","3/4"]</code>");'
-  - text: '<code>farey(5)</code> should return <code>["1/5","1/4","1/3","2/5","1/2","2/4","3/5","2/3","3/4","4/5"]</code>'
-    testString: 'assert.deepEqual(farey(5), ["1/5","1/4","1/3","2/5","1/2","2/4","3/5","2/3","3/4","4/5"], "<code>farey(5)</code> should return <code>["1/5","1/4","1/3","2/5","1/2","2/4","3/5","2/3","3/4","4/5"]</code>");'
+    testString: assert(Array.isArray(farey(3)), '<code>farey(3)</code> should return an array');
+  - text: <code>farey(3)</code> should return <code>["1/3","1/2","2/3"]</code>
+    testString: assert.deepEqual(farey(3), ["1/3","1/2","2/3"], '<code>farey(3)</code> should return <code>["1/3","1/2","2/3"]</code>');
+  - text: <code>farey(4)</code> should return <code>["1/4","1/3","1/2","2/4","2/3","3/4"]</code>
+    testString: assert.deepEqual(farey(4), ["1/4","1/3","1/2","2/4","2/3","3/4"], '<code>farey(4)</code> should return <code>["1/4","1/3","1/2","2/4","2/3","3/4"]</code>');
+  - text: <code>farey(5)</code> should return <code>["1/5","1/4","1/3","2/5","1/2","2/4","3/5","2/3","3/4","4/5"]</code>
+    testString: assert.deepEqual(farey(5), ["1/5","1/4","1/3","2/5","1/2","2/4","3/5","2/3","3/4","4/5"], '<code>farey(5)</code> should return <code>["1/5","1/4","1/3","2/5","1/2","2/4","3/5","2/3","3/4","4/5"]</code>');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-n-step-number-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-n-step-number-sequences.english.md
index fbbe1f962d..af72512351 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-n-step-number-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-n-step-number-sequences.english.md
@@ -48,21 +48,21 @@ For general $n>2$ we have the Fibonacci $n$-step sequence - $F_k^n$; with initia
 ```yml
 tests:
   - text: <code>fib_luc</code> is a function.
-    testString: 'assert(typeof fib_luc === "function", "<code>fib_luc</code> is a function.");'
-  - text: '<code>fib_luc(2,10,"f")</code> should return <code>[1,1,2,3,5,8,13,21,34,55]</code>.'
-    testString: 'assert.deepEqual(fib_luc(2,10,"f"),ans[0],"<code>fib_luc(2,10,"f")</code> should return <code>[1,1,2,3,5,8,13,21,34,55]</code>.");'
-  - text: '<code>fib_luc(3,15,"f")</code> should return <code>[1,1,2,4,7,13,24,44,81,149,274,504,927,1705,3136]</code>.'
-    testString: 'assert.deepEqual(fib_luc(3,15,"f"),ans[1],"<code>fib_luc(3,15,"f")</code> should return <code>[1,1,2,4,7,13,24,44,81,149,274,504,927,1705,3136]</code>.");'
-  - text: '<code>fib_luc(4,15,"f")</code> should return <code>[1,1,2,4,8,15,29,56,108,208,401,773,1490,2872,5536]</code>.'
-    testString: 'assert.deepEqual(fib_luc(4,15,"f"),ans[2],"<code>fib_luc(4,15,"f")</code> should return <code>[1,1,2,4,8,15,29,56,108,208,401,773,1490,2872,5536]</code>.");'
-  - text: '<code>fib_luc(2,10,"l")</code> should return <code>[ 2, 1, 3, 4, 7, 11, 18, 29, 47, 76]</code>.'
-    testString: 'assert.deepEqual(fib_luc(2,10,"l"),ans[3],"<code>fib_luc(2,10,"l")</code> should return <code>[ 2, 1, 3, 4, 7, 11, 18, 29, 47, 76]</code>.");'
-  - text: '<code>fib_luc(3,15,"l")</code> should return <code>[ 2, 1, 3, 6, 10, 19, 35, 64, 118, 217, 399, 734, 1350, 2483, 4567 ]</code>.'
-    testString: 'assert.deepEqual(fib_luc(3,15,"l"),ans[4],"<code>fib_luc(3,15,"l")</code> should return <code>[ 2, 1, 3, 6, 10, 19, 35, 64, 118, 217, 399, 734, 1350, 2483, 4567 ]</code>.");'
-  - text: '<code>fib_luc(4,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 22, 43, 83, 160, 308, 594, 1145, 2207, 4254, 8200 ]</code>.'
-    testString: 'assert.deepEqual(fib_luc(4,15,"l"),ans[5],"<code>fib_luc(4,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 22, 43, 83, 160, 308, 594, 1145, 2207, 4254, 8200 ]</code>.");'
-  - text: '<code>fib_luc(5,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 24, 46, 91, 179, 352, 692, 1360, 2674, 5257, 10335 ]</code>.'
-    testString: 'assert.deepEqual(fib_luc(5,15,"l"),ans[6],"<code>fib_luc(5,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 24, 46, 91, 179, 352, 692, 1360, 2674, 5257, 10335 ]</code>.");'
+    testString: assert(typeof fib_luc === 'function', '<code>fib_luc</code> is a function.');
+  - text: <code>fib_luc(2,10,"f")</code> should return <code>[1,1,2,3,5,8,13,21,34,55]</code>.
+    testString: assert.deepEqual(fib_luc(2,10,"f"),ans[0],'<code>fib_luc(2,10,"f")</code> should return <code>[1,1,2,3,5,8,13,21,34,55]</code>.');
+  - text: <code>fib_luc(3,15,"f")</code> should return <code>[1,1,2,4,7,13,24,44,81,149,274,504,927,1705,3136]</code>.
+    testString: assert.deepEqual(fib_luc(3,15,"f"),ans[1],'<code>fib_luc(3,15,"f")</code> should return <code>[1,1,2,4,7,13,24,44,81,149,274,504,927,1705,3136]</code>.');
+  - text: <code>fib_luc(4,15,"f")</code> should return <code>[1,1,2,4,8,15,29,56,108,208,401,773,1490,2872,5536]</code>.
+    testString: assert.deepEqual(fib_luc(4,15,"f"),ans[2],'<code>fib_luc(4,15,"f")</code> should return <code>[1,1,2,4,8,15,29,56,108,208,401,773,1490,2872,5536]</code>.');
+  - text: <code>fib_luc(2,10,"l")</code> should return <code>[ 2, 1, 3, 4, 7, 11, 18, 29, 47, 76]</code>.
+    testString: assert.deepEqual(fib_luc(2,10,"l"),ans[3],'<code>fib_luc(2,10,"l")</code> should return <code>[ 2, 1, 3, 4, 7, 11, 18, 29, 47, 76]</code>.');
+  - text: <code>fib_luc(3,15,"l")</code> should return <code>[ 2, 1, 3, 6, 10, 19, 35, 64, 118, 217, 399, 734, 1350, 2483, 4567 ]</code>.
+    testString: assert.deepEqual(fib_luc(3,15,"l"),ans[4],'<code>fib_luc(3,15,"l")</code> should return <code>[ 2, 1, 3, 6, 10, 19, 35, 64, 118, 217, 399, 734, 1350, 2483, 4567 ]</code>.');
+  - text: <code>fib_luc(4,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 22, 43, 83, 160, 308, 594, 1145, 2207, 4254, 8200 ]</code>.
+    testString: assert.deepEqual(fib_luc(4,15,"l"),ans[5],'<code>fib_luc(4,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 22, 43, 83, 160, 308, 594, 1145, 2207, 4254, 8200 ]</code>.');
+  - text: <code>fib_luc(5,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 24, 46, 91, 179, 352, 692, 1360, 2674, 5257, 10335 ]</code>.
+    testString: assert.deepEqual(fib_luc(5,15,"l"),ans[6],'<code>fib_luc(5,15,"l")</code> should return <code>[ 2, 1, 3, 6, 12, 24, 46, 91, 179, 352, 692, 1360, 2674, 5257, 10335 ]</code>.');
 
 ```
 
@@ -86,7 +86,13 @@ function fib_luc (n, len, w) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const ans = [[1,1,2,3,5,8,13,21,34,55],
+[1,1,2,4,7,13,24,44,81,149,274,504,927,1705,3136],
+[1,1,2,4,8,15,29,56,108,208,401,773,1490,2872,5536],
+[ 2, 1, 3, 4, 7, 11, 18, 29, 47, 76],
+[ 2, 1, 3, 6, 10, 19, 35, 64, 118, 217, 399, 734, 1350, 2483, 4567 ],
+[ 2, 1, 3, 6, 12, 22, 43, 83, 160, 308, 594, 1145, 2207, 4254, 8200 ],
+[ 2, 1, 3, 6, 12, 24, 46, 91, 179, 352, 692, 1360, 2674, 5257, 10335 ]];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-sequence.english.md
index 46a3c7ba77..dea4effb64 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-sequence.english.md
@@ -25,15 +25,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>fibonacci</code> is a function.
-    testString: 'assert(typeof fibonacci === "function", "<code>fibonacci</code> is a function.");'
+    testString: assert(typeof fibonacci === 'function', '<code>fibonacci</code> is a function.');
   - text: <code>fibonacci(2)</code> should return a number.
-    testString: 'assert(typeof fibonacci(2) == "number", "<code>fibonacci(2)</code> should return a number.");'
+    testString: assert(typeof fibonacci(2) == 'number', '<code>fibonacci(2)</code> should return a number.');
   - text: <code>fibonacci(3)</code> should return 1.")
-    testString: 'assert.equal(fibonacci(3),1,"<code>fibonacci(3)</code> should return 1.");'
+    testString: assert.equal(fibonacci(3),1,"<code>fibonacci(3)</code> should return 1.");
   - text: <code>fibonacci(5)</code> should return 3.")
-    testString: 'assert.equal(fibonacci(5),3,"<code>fibonacci(5)</code> should return 3.");'
+    testString: assert.equal(fibonacci(5),3,"<code>fibonacci(5)</code> should return 3.");
   - text: <code>fibonacci(10)</code> should return 34.")
-    testString: 'assert.equal(fibonacci(10),34,"<code>fibonacci(10)</code> should return 34.");'
+    testString: assert.equal(fibonacci(10),34,"<code>fibonacci(10)</code> should return 34.");
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-word.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-word.english.md
index ef59df19e2..77138a4aca 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-word.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fibonacci-word.english.md
@@ -23,11 +23,11 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>fibWord</code> is a function.
-    testString: 'assert(typeof fibWord === "function", "<code>fibWord</code> is a function.");'
+    testString: assert(typeof fibWord === 'function', '<code>fibWord</code> is a function.');
   - text: <code>fibWord(5)</code> should return an array.
-    testString: 'assert(Array.isArray(fibWord(5)),"<code>fibWord(5)</code> should return an array.");'
+    testString: assert(Array.isArray(fibWord(5)),'<code>fibWord(5)</code> should return an array.');
   - text: <code>fibWord(5)</code> should return <code>'+JSON.stringify(ans)+'</code>.
-    testString: 'assert.deepEqual(fibWord(5),ans,"<code>fibWord(5)</code> should return <code>"+JSON.stringify(ans)+"</code>.");'
+    testString: assert.deepEqual(fibWord(5),ans,'<code>fibWord(5)</code> should return <code>'+JSON.stringify(ans)+'</code>.');
 
 ```
 
@@ -51,7 +51,15 @@ function fibWord (n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+let ans=[ { N: 1, Length: 1, Entropy: 0, Word: '1' },
+
+  { N: 2, Length: 1, Entropy: 0, Word: '0' },
+
+  { N: 3, Length: 2, Entropy: 1, Word: '01' },
+
+  { N: 4, Length: 3, Entropy: 0.9182958340544896, Word: '010' },
+
+  { N: 5, Length: 5, Entropy: 0.9709505944546688, Word: '01001' }];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fractran.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fractran.english.md
index faff507572..336be215fb 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fractran.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/fractran.english.md
@@ -26,19 +26,19 @@ challengeType: 3
 ```yml
 tests:
   - text: <code>fractran</code> should be a function.
-    testString: 'assert(typeof fractran=="function","<code>fractran</code> should be a function.");'
-  - text: '<code>fractran(""+tests[0]+"")</code> should return an array.'
-    testString: 'assert(Array.isArray(fractran(tests[0])),"<code>fractran(""+tests[0]+"")</code> should return an array.");'
-  - text: '<code>fractran(""+tests[0]+"")</code> should return <code>"+JSON.stringify(results[0])+"</code>.'
-    testString: 'assert.deepEqual(fractran(tests[0]),results[0],"<code>fractran(""+tests[0]+"")</code> should return <code>"+JSON.stringify(results[0])+"</code>.");'
-  - text: '<code>fractran(""+tests[1]+"")</code> should return <code>"+JSON.stringify(results[1])+"</code>.'
-    testString: 'assert.deepEqual(fractran(tests[1]),results[1],"<code>fractran(""+tests[1]+"")</code> should return <code>"+JSON.stringify(results[1])+"</code>.");'
-  - text: '<code>fractran(""+tests[2]+"")</code> should return <code>"+JSON.stringify(results[2])+"</code>.'
-    testString: 'assert.deepEqual(fractran(tests[2]),results[2],"<code>fractran(""+tests[2]+"")</code> should return <code>"+JSON.stringify(results[2])+"</code>.");'
-  - text: '<code>fractran(""+tests[3]+"")</code> should return <code>"+JSON.stringify(results[3])+"</code>.'
-    testString: 'assert.deepEqual(fractran(tests[3]),results[3],"<code>fractran(""+tests[3]+"")</code> should return <code>"+JSON.stringify(results[3])+"</code>.");'
-  - text: '<code>fractran(""+tests[4]+"")</code> should return <code>"+JSON.stringify(results[4])+"</code>.'
-    testString: 'assert.deepEqual(fractran(tests[4]),results[4],"<code>fractran(""+tests[4]+"")</code> should return <code>"+JSON.stringify(results[4])+"</code>.");'
+    testString: assert(typeof fractran=='function','<code>fractran</code> should be a function.');
+  - text: <code>fractran("3/2, 1/3")</code> should return an array.
+    testString: assert(Array.isArray(fractran('3/2, 1/3')),'<code>fractran("3/2, 1/3")</code> should return an array.');
+  - text: <code>fractran("3/2, 1/3")</code> should return <code>[ 2, 3, 1 ]</code>.
+    testString: assert.deepEqual(fractran('3/2, 1/3'), [ 2, 3, 1 ],'<code>fractran("3/2, 1/3")</code> should return <code>[ 2, 3, 1 ]</code>.');
+  - text: <code>fractran("3/2, 5/3, 1/5")</code> should return <code>[ 2, 3, 5, 1 ]</code>.
+    testString: assert.deepEqual(fractran('3/2, 5/3, 1/5'), [ 2, 3, 5, 1 ],'<code>fractran("3/2, 5/3, 1/5")</code> should return <code>[ 2, 3, 5, 1 ]</code>.');
+  - text: <code>fractran("3/2, 6/3")</code> should return <code>[ 2, 3, 6, 9, 18, 27, 54, 81, 162, 243 ]</code>.
+    testString: assert.deepEqual(fractran('3/2, 6/3'), [ 2, 3, 6, 9, 18, 27, 54, 81, 162, 243 ],'<code>fractran("3/2, 6/3")</code> should return <code>[ 2, 3, 6, 9, 18, 27, 54, 81, 162, 243 ]</code>.');
+  - text: <code>fractran("2/7, 7/2")</code> should return <code>[ 2, 7, 2, 7, 2, 7, 2, 7, 2, 7 ]</code>.
+    testString: assert.deepEqual(fractran('2/7, 7/2'), [ 2, 7, 2, 7, 2, 7, 2, 7, 2, 7 ],'<code>fractran("2/7, 7/2")</code> should return <code>[ 2, 7, 2, 7, 2, 7, 2, 7, 2, 7 ]</code>.');
+  - text: <code>fractran("17/91, 78/85, 19/51, 23/38, 29/33, 77/29, 95/23, 77/19, 1/17, 11/13, 13/11, 15/14, 15/2, 55/1")</code> should return <code>[ 2, 15, 825, 725, 1925, 2275, 425, 390, 330, 290 ]</code>.
+    testString: assert.deepEqual(fractran('17/91, 78/85, 19/51, 23/38, 29/33, 77/29, 95/23, 77/19, 1/17, 11/13, 13/11, 15/14, 15/2, 55/1'), [ 2, 15, 825, 725, 1925, 2275, 425, 390, 330, 290 ],'<code>fractran("17/91, 78/85, 19/51, 23/38, 29/33, 77/29, 95/23, 77/19, 1/17, 11/13, 13/11, 15/14, 15/2, 55/1")</code> should return <code>[ 2, 15, 825, 725, 1925, 2275, 425, 390, 330, 290 ]</code>.');
 
 ```
 
@@ -57,16 +57,6 @@ function fractran (progStr) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gamma-function.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gamma-function.english.md
index 9d606637b3..b2671431f5 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gamma-function.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gamma-function.english.md
@@ -22,19 +22,19 @@ The Gamma function can be defined as:
 ```yml
 tests:
   - text: <code>gamma</code> should be a function.
-    testString: 'assert(typeof gamma=="function","<code>gamma</code> should be a function.")'
-  - text: '<code>gamma("+tests[0]+")</code> should return a number.'
-    testString: 'assert(typeof gamma(tests[0])=="number","<code>gamma("+tests[0]+")</code> should return a number.")'
-  - text: '<code>gamma("+tests[0]+")</code> should return <code>"+results[0]+"</code>.'
-    testString: 'assert.equal(gamma(tests[0]),results[0],"<code>gamma("+tests[0]+")</code> should return <code>"+results[0]+"</code>.")'
-  - text: '<code>gamma("+tests[1]+")</code> should return <code>"+results[1]+"</code>.'
-    testString: 'assert.equal(gamma(tests[1]),results[1],"<code>gamma("+tests[1]+")</code> should return <code>"+results[1]+"</code>.")'
-  - text: '<code>gamma("+tests[2]+")</code> should return <code>"+results[2]+"</code>.'
-    testString: 'assert.equal(gamma(tests[2]),results[2],"<code>gamma("+tests[2]+")</code> should return <code>"+results[2]+"</code>.")'
-  - text: '<code>gamma("+tests[3]+")</code> should return <code>"+results[3]+"</code>.'
-    testString: 'assert.equal(gamma(tests[3]),results[3],"<code>gamma("+tests[3]+")</code> should return <code>"+results[3]+"</code>.")'
-  - text: '<code>gamma("+tests[4]+")</code> should return <code>"+results[4]+"</code>.'
-    testString: 'assert.equal(gamma(tests[4]),results[4],"<code>gamma("+tests[4]+")</code> should return <code>"+results[4]+"</code>.")'
+    testString: assert(typeof gamma=='function','<code>gamma</code> should be a function.')
+  - text: <code>gamma(.1)</code> should return a number.
+    testString: assert(typeof gamma(.1)=='number','<code>gamma(.1)</code> should return a number.')
+  - text: <code>gamma(.1)</code> should return <code>9.513507698668736</code>.
+    testString: assert.equal(gamma(.1), 9.513507698668736,'<code>gamma(.1)</code> should return <code>9.513507698668736</code>.')
+  - text: <code>gamma(.2)</code> should return <code>4.590843711998803</code>.
+    testString: assert.equal(gamma(.2), 4.590843711998803,'<code>gamma(.2)</code> should return <code>4.590843711998803</code>.')
+  - text: <code>gamma(.3)</code> should return <code>2.9915689876875904</code>.
+    testString: assert.equal(gamma(.3), 2.9915689876875904,'<code>gamma(.3)</code> should return <code>2.9915689876875904</code>.')
+  - text: <code>gamma(.4)</code> should return <code>2.218159543757687</code>.
+    testString: assert.equal(gamma(.4), 2.218159543757687,'<code>gamma(.4)</code> should return <code>2.218159543757687</code>.')
+  - text: <code>gamma(.5)</code> should return <code>1.7724538509055159</code>.
+    testString: assert.equal(gamma(.5), 1.7724538509055159,'<code>gamma(.5)</code> should return <code>1.7724538509055159</code>.')
 
 ```
 
@@ -53,16 +53,6 @@ function gamma (x) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gaussian-elimination.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gaussian-elimination.english.md
index 819777a017..edfd12748a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gaussian-elimination.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gaussian-elimination.english.md
@@ -20,19 +20,19 @@ Write a function to solve \(A.x = b\) using Gaussian elimination then backwards
 ```yml
 tests:
   - text: <code>gaussianElimination</code> should be a function.
-    testString: 'assert(typeof gaussianElimination=="function","<code>gaussianElimination</code> should be a function.");'
-  - text: <code>gaussianElimination("+JSON.stringify(tests[0][0])+","+JSON.stringify(tests[0][1])+")</code> should return an array.
-    testString: 'assert(Array.isArray(gaussianElimination(tests[0][0],tests[0][1])),"<code>gaussianElimination("+JSON.stringify(tests[0][0])+","+JSON.stringify(tests[0][1])+")</code> should return an array.");'
-  - text: <code>gaussianElimination("+JSON.stringify(tests[0][0])+","+JSON.stringify(tests[0][1])+")</code> should return <code>"+JSON.stringify(results[0])+"</code>.
-    testString: 'assert.deepEqual(gaussianElimination(tests[0][0],tests[0][1]),results[0],"<code>gaussianElimination("+JSON.stringify(tests[0][0])+","+JSON.stringify(tests[0][1])+")</code> should return <code>"+JSON.stringify(results[0])+"</code>.");'
-  - text: <code>gaussianElimination("+JSON.stringify(tests[1][0])+","+JSON.stringify(tests[1][1])+")</code> should return <code>"+JSON.stringify(results[1])+"</code>.
-    testString: 'assert.deepEqual(gaussianElimination(tests[1][0],tests[1][1]),results[1],"<code>gaussianElimination("+JSON.stringify(tests[1][0])+","+JSON.stringify(tests[1][1])+")</code> should return <code>"+JSON.stringify(results[1])+"</code>.");'
-  - text: <code>gaussianElimination("+JSON.stringify(tests[2][0])+","+JSON.stringify(tests[2][1])+")</code> should return <code>"+JSON.stringify(results[2])+"</code>.
-    testString: 'assert.deepEqual(gaussianElimination(tests[2][0],tests[2][1]),results[2],"<code>gaussianElimination("+JSON.stringify(tests[2][0])+","+JSON.stringify(tests[2][1])+")</code> should return <code>"+JSON.stringify(results[2])+"</code>.");'
-  - text: <code>gaussianElimination("+JSON.stringify(tests[3][0])+","+JSON.stringify(tests[3][1])+")</code> should return <code>"+JSON.stringify(results[3])+"</code>.
-    testString: 'assert.deepEqual(gaussianElimination(tests[3][0],tests[3][1]),results[3],"<code>gaussianElimination("+JSON.stringify(tests[3][0])+","+JSON.stringify(tests[3][1])+")</code> should return <code>"+JSON.stringify(results[3])+"</code>.");'
-  - text: <code>gaussianElimination("+JSON.stringify(tests[4][0])+","+JSON.stringify(tests[4][1])+")</code> should return <code>"+JSON.stringify(results[4])+"</code>.
-    testString: 'assert.deepEqual(gaussianElimination(tests[4][0],tests[4][1]),results[4],"<code>gaussianElimination("+JSON.stringify(tests[4][0])+","+JSON.stringify(tests[4][1])+")</code> should return <code>"+JSON.stringify(results[4])+"</code>.");'
+    testString: assert(typeof gaussianElimination=='function','<code>gaussianElimination</code> should be a function.');
+  - text: <code>gaussianElimination([[1,1],[1,-1]], [5,1])</code> should return an array.
+    testString: assert(Array.isArray(gaussianElimination([[1,1],[1,-1]], [5,1])),'<code>gaussianElimination([[1,1],[1,-1]], [5,1])</code> should return an array.');
+  - text: <code>gaussianElimination([[1,1],[1,-1]], [5,1])</code> should return <code>[ 3, 2 ]</code>.
+    testString: assert.deepEqual(gaussianElimination([[1,1],[1,-1]], [5,1]), [ 3, 2 ],'<code>gaussianElimination([[1,1],[1,-1]], [5,1])</code> should return <code>[ 3, 2 ]</code>.');
+  - text: <code>gaussianElimination([[2,3],[2,1]] , [8,4])</code> should return <code>[ 1, 2 ]</code>.
+    testString: assert.deepEqual(gaussianElimination([[2,3],[2,1]] , [8,4]), [ 1, 2 ],'<code>gaussianElimination([[2,3],[2,1]] , [8,4])</code> should return <code>[ 1, 2 ]</code>.');
+  - text: <code>gaussianElimination([[1,3],[5,-2]], [14,19])</code> should return <code>[ 5, 3 ]</code>.
+    testString: assert.deepEqual(gaussianElimination([[1,3],[5,-2]], [14,19]), [ 5, 3 ],'<code>gaussianElimination([[1,3],[5,-2]], [14,19])</code> should return <code>[ 5, 3 ]</code>.');
+  - text: <code>gaussianElimination([[1,1],[5,-1]] , [10,14])</code> should return <code>[ 4, 6 ]</code>.
+    testString: assert.deepEqual(gaussianElimination([[1,1],[5,-1]] , [10,14]), [ 4, 6 ],'<code>gaussianElimination([[1,1],[5,-1]] , [10,14])</code> should return <code>[ 4, 6 ]</code>.');
+  - text: <code>gaussianElimination([[1,2,3],[4,5,6],[7,8,8]] , [6,15,23])</code> should return <code>[ 1, 1, 1 ]</code>.
+    testString: assert.deepEqual(gaussianElimination([[1,2,3],[4,5,6],[7,8,8]] , [6,15,23]), [ 1, 1, 1 ],'<code>gaussianElimination([[1,2,3],[4,5,6],[7,8,8]] , [6,15,23])</code> should return <code>[ 1, 1, 1 ]</code>.');
 
 ```
 
@@ -51,16 +51,6 @@ function gaussianElimination (A,b) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/general-fizzbuzz.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/general-fizzbuzz.english.md
index 041891e856..320b0ca751 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/general-fizzbuzz.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/general-fizzbuzz.english.md
@@ -24,23 +24,23 @@ The second parameter is the number for which the function should return a string
 ```yml
 tests:
   - text: <code>genFizzBuzz</code> should be a function.
-    testString: 'assert(typeof genFizzBuzz=="function","<code>genFizzBuzz</code> should be a function.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[0][0])+","+tests[0][1]+")</code> should return a type.
-    testString: 'assert(typeof genFizzBuzz(tests[0][0],tests[0][1])=="string","<code>genFizzBuzz("+JSON.stringify(tests[0][0])+","+tests[0][1]+")</code> should return a type.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[0][0])+","+tests[0][1]+")</code> should return <code>""+results[0]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[0][0],tests[0][1]),results[0],"<code>genFizzBuzz("+JSON.stringify(tests[0][0])+","+tests[0][1]+")</code> should return <code>""+results[0]+""</code>.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[1][0])+","+tests[1][1]+")</code> should return <code>""+results[1]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[1][0],tests[1][1]),results[1],"<code>genFizzBuzz("+JSON.stringify(tests[1][0])+","+tests[1][1]+")</code> should return <code>""+results[1]+""</code>.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[2][0])+","+tests[2][1]+")</code> should return <code>""+results[2]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[2][0],tests[2][1]),results[2],"<code>genFizzBuzz("+JSON.stringify(tests[2][0])+","+tests[2][1]+")</code> should return <code>""+results[2]+""</code>.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[3][0])+","+tests[3][1]+")</code> should return <code>""+results[3]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[3][0],tests[3][1]),results[3],"<code>genFizzBuzz("+JSON.stringify(tests[3][0])+","+tests[3][1]+")</code> should return <code>""+results[3]+""</code>.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[4][0])+","+tests[4][1]+")</code> should return <code>""+results[4]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[4][0],tests[4][1]),results[4],"<code>genFizzBuzz("+JSON.stringify(tests[4][0])+","+tests[4][1]+")</code> should return <code>""+results[4]+""</code>.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[5][0])+","+tests[5][1]+")</code> should return <code>""+results[5]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[5][0],tests[5][1]),results[5],"<code>genFizzBuzz("+JSON.stringify(tests[5][0])+","+tests[5][1]+")</code> should return <code>""+results[5]+""</code>.");'
-  - text: <code>genFizzBuzz("+JSON.stringify(tests[6][0])+","+tests[6][1]+")</code> should return <code>""+results[6]+""</code>.
-    testString: 'assert.equal(genFizzBuzz(tests[6][0],tests[6][1]),results[6],"<code>genFizzBuzz("+JSON.stringify(tests[6][0])+","+tests[6][1]+")</code> should return <code>""+results[6]+""</code>.");'
+    testString: assert(typeof genFizzBuzz=='function','<code>genFizzBuzz</code> should be a function.');
+  - text: <code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 6)</code> should return a string.
+    testString: assert(typeof genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 6)=='string','<code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 6)</code> should return a string.');
+  - text: <code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 6)</code> should return <code>"Fizz"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 6), "Fizz",'<code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 6)</code> should return <code>"Fizz"</code>.');
+  - text: <code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 10)</code> should return <code>"Buzz"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 10), "Buzz",'<code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 10)</code> should return <code>"Buzz"</code>.');
+  - text: <code>genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 12)</code> should return <code>"Buzz"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 12), "Buzz",'<code>genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 12)</code> should return <code>"Buzz"</code>.');
+  - text: <code>genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 13)</code> should return <code>"13"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 13), '13','<code>genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 13)</code> should return <code>"13"</code>.');
+  - text: <code>genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 15)</code> should return <code>"BuzzFizz"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 15), 'BuzzFizz','<code>genFizzBuzz([[3, "Buzz"],[5, "Fizz"]], 15)</code> should return <code>"BuzzFizz"</code>.');
+  - text: <code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 15)</code> should return <code>"FizzBuzz"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 15), 'FizzBuzz','<code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"]], 15)</code> should return <code>"FizzBuzz"</code>.');
+  - text: <code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"],[7, "Baxx"]], 105)</code> should return <code>"FizzBuzzBaxx"</code>.
+    testString: assert.equal(genFizzBuzz([[3, "Fizz"],[5, "Buzz"],[7, "Baxx"]], 105), 'FizzBuzzBaxx','<code>genFizzBuzz([[3, "Fizz"],[5, "Buzz"],[7, "Baxx"]], 105)</code> should return <code>"FizzBuzzBaxx"</code>.');
 
 ```
 
@@ -59,16 +59,6 @@ function genFizzBuzz (rules, num) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
@@ -77,13 +67,13 @@ console.info('after the test');
 
 ```js
 function genFizzBuzz(rules, num) {
-  let res=";
+  let res='';
   rules.forEach(function (e) {
     if(num % e[0] == 0)
       res+=e[1];
   })
 
-  if(res=="){
+  if(res==''){
     res=num.toString();
   }
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generate-lower-case-ascii-alphabet.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generate-lower-case-ascii-alphabet.english.md
index 13448e3698..6a3a6804a3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generate-lower-case-ascii-alphabet.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generate-lower-case-ascii-alphabet.english.md
@@ -20,19 +20,19 @@ Write a function to generate an array of lower case ASCII characters, for a give
 ```yml
 tests:
   - text: <code>lascii</code> should be a function.
-    testString: 'assert(typeof lascii=="function","<code>lascii</code> should be a function.");'
+    testString: assert(typeof lascii=='function','<code>lascii</code> should be a function.');
   - text: <code>lascii("a","d")</code> should return an array.
-    testString: 'assert(Array.isArray(lascii("a","d")),"<code>lascii("a","d")</code> should return an array.");'
-  - text: '"<code>lascii("a","d")</code> should return <code>[ "a", "b", "c", "d" ]</code>."'
-    testString: 'assert.deepEqual(lascii("a","d"),results[0],"<code>lascii("a","d")</code> should return <code>[ "a", "b", "c", "d" ]</code>.");'
-  - text: '"<code>lascii("c","i")</code> should return <code>[ "c", "d", "e", "f", "g", "h", "i" ]</code>."'
-    testString: 'assert.deepEqual(lascii("c","i"),results[1],"<code>lascii("c","i")</code> should return <code>[ "c", "d", "e", "f", "g", "h", "i" ]</code>.");'
-  - text: '"<code>lascii("m","q")</code> should return <code>[ "m", "n", "o", "p", "q" ]</code>."'
-    testString: 'assert.deepEqual(lascii("m","q"),results[2],"<code>lascii("m","q")</code> should return <code>[ "m", "n", "o", "p", "q" ]</code>.");'
-  - text: '"<code>lascii("k","n")</code> should return <code>[ "k", "l", "m", "n" ]</code>.")'
-    testString: 'assert.deepEqual(lascii("k","n"),results[3],"<code>lascii("k","n")</code> should return <code>[ "k", "l", "m", "n" ]</code>.");'
-  - text: '"<code>lascii("t","z")</code> should return <code>[ "t", "u", "v", "w", "x", "y", "z" ]</code>."'
-    testString: 'assert.deepEqual(lascii("t","z"),results[4],"<code>lascii("t","z")</code> should return <code>[ "t", "u", "v", "w", "x", "y", "z" ]</code>.");'
+    testString: assert(Array.isArray(lascii('a','d')),'<code>lascii("a","d")</code> should return an array.');
+  - text: "<code>lascii('a','d')</code> should return <code>[ 'a', 'b', 'c', 'd' ]</code>."
+    testString: assert.deepEqual(lascii("a","d"),results[0],"<code>lascii('a','d')</code> should return <code>[ 'a', 'b', 'c', 'd' ]</code>.");
+  - text: <code>lascii('c','i')</code> should return <code>[ 'c', 'd', 'e', 'f', 'g', 'h', 'i' ]</code>.
+    testString: assert.deepEqual(lascii("c","i"),results[1],"<code>lascii('c','i')</code> should return <code>[ 'c', 'd', 'e', 'f', 'g', 'h', 'i' ]</code>.");
+  - text: <code>lascii('m','q')</code> should return <code>[ 'm', 'n', 'o', 'p', 'q' ]</code>.
+    testString: assert.deepEqual(lascii("m","q"),results[2],"<code>lascii('m','q')</code> should return <code>[ 'm', 'n', 'o', 'p', 'q' ]</code>.");
+  - text: <code>lascii('k','n')</code> should return <code>[ 'k', 'l', 'm', 'n' ]</code>.
+    testString: assert.deepEqual(lascii("k","n"),results[3],"<code>lascii('k','n')</code> should return <code>[ 'k', 'l', 'm', 'n' ]</code>.");
+  - text: <code>lascii('t','z')</code> should return <code>[ 't', 'u', 'v', 'w', 'x', 'y', 'z' ]</code>.
+    testString: assert.deepEqual(lascii("t","z"),results[4],"<code>lascii('t','z')</code> should return <code>[ 't', 'u', 'v', 'w', 'x', 'y', 'z' ]</code>.");
 
 ```
 
@@ -56,7 +56,13 @@ function lascii (cFrom, cTo) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+let results=[
+  [ 'a', 'b', 'c', 'd' ],
+  [ 'c', 'd', 'e', 'f', 'g', 'h', 'i' ],
+  [ 'm', 'n', 'o', 'p', 'q' ],
+  [ 'k', 'l', 'm', 'n' ],
+  [ 't', 'u', 'v', 'w', 'x', 'y', 'z' ]
+]
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generatorexponential.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generatorexponential.english.md
index 76c3bbec88..7518879257 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generatorexponential.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/generatorexponential.english.md
@@ -25,19 +25,19 @@ For example for \(n=7\), the function should return 81 as the sequence would be
 ```yml
 tests:
   - text: <code>exponentialGenerator</code> should be a function.
-    testString: 'assert(typeof exponentialGenerator=="function","<code>exponentialGenerator</code> should be a function.");'
+    testString: assert(typeof exponentialGenerator=='function','<code>exponentialGenerator</code> should be a function.');
   - text: <code>exponentialGenerator()</code> should return a number.
-    testString: 'assert(typeof exponentialGenerator(10)=="number","<code>exponentialGenerator()</code> should return a number.");'
+    testString: assert(typeof exponentialGenerator(10)=='number','<code>exponentialGenerator()</code> should return a number.');
   - text: <code>exponentialGenerator(10)</code> should return <code>144</code>.
-    testString: 'assert.equal(exponentialGenerator(10),144,"<code>exponentialGenerator(10)</code> should return <code>144</code>.");'
+    testString: assert.equal(exponentialGenerator(10),144,'<code>exponentialGenerator(10)</code> should return <code>144</code>.');
   - text: <code>exponentialGenerator(12)</code> should return <code>196</code>.
-    testString: 'assert.equal(exponentialGenerator(12),196,"<code>exponentialGenerator(12)</code> should return <code>196</code>.");'
+    testString: assert.equal(exponentialGenerator(12),196,'<code>exponentialGenerator(12)</code> should return <code>196</code>.');
   - text: <code>exponentialGenerator(14)</code> should return <code>256</code>.
-    testString: 'assert.equal(exponentialGenerator(14),256,"<code>exponentialGenerator(14)</code> should return <code>256</code>.");'
+    testString: assert.equal(exponentialGenerator(14),256,'<code>exponentialGenerator(14)</code> should return <code>256</code>.');
   - text: <code>exponentialGenerator(20)</code> should return <code>484</code>.
-    testString: 'assert.equal(exponentialGenerator(20),484,"<code>exponentialGenerator(20)</code> should return <code>484</code>.");'
+    testString: assert.equal(exponentialGenerator(20),484,'<code>exponentialGenerator(20)</code> should return <code>484</code>.');
   - text: <code>exponentialGenerator(25)</code> should return <code>784</code>.
-    testString: 'assert.equal(exponentialGenerator(25),784,"<code>exponentialGenerator(25)</code> should return <code>784</code>.");'
+    testString: assert.equal(exponentialGenerator(25),784,'<code>exponentialGenerator(25)</code> should return <code>784</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gray-code.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gray-code.english.md
index 3449afae22..f057348746 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gray-code.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/gray-code.english.md
@@ -29,21 +29,21 @@ There are many possible Gray codes. The following encodes what is called "binary
 ```yml
 tests:
   - text: <code>gray</code> should be a function.
-    testString: 'assert(typeof gray=="function","<code>gray</code> should be a function.");'
+    testString: assert(typeof gray=='function','<code>gray</code> should be a function.');
   - text: <code>gray(true,177)</code> should return a number.
-    testString: 'assert(typeof gray(true,177)=="number","<code>gray(true,177)</code> should return a number.");'
+    testString: assert(typeof gray(true,177)=='number','<code>gray(true,177)</code> should return a number.');
   - text: <code>gray(true,177)</code> should return <code>233</code>.
-    testString: 'assert.equal(gray(true,177),233,"<code>gray(true,177)</code> should return <code>233</code>.");'
+    testString: assert.equal(gray(true,177),233,'<code>gray(true,177)</code> should return <code>233</code>.');
   - text: <code>gray(true,425)</code> should return <code>381</code>.
-    testString: 'assert.equal(gray(true,425),381,"<code>gray(true,425)</code> should return <code>381</code>.");'
+    testString: assert.equal(gray(true,425),381,'<code>gray(true,425)</code> should return <code>381</code>.');
   - text: <code>gray(true,870)</code> should return <code>725</code>.
-    testString: 'assert.equal(gray(true,870),725,"<code>gray(true,870)</code> should return <code>725</code>.");'
+    testString: assert.equal(gray(true,870),725,'<code>gray(true,870)</code> should return <code>725</code>.');
   - text: <code>gray(false,233)</code> should return <code>177</code>.
-    testString: 'assert.equal(gray(false,233),177,"<code>gray(false,233)</code> should return <code>177</code>.");'
+    testString: assert.equal(gray(false,233),177,'<code>gray(false,233)</code> should return <code>177</code>.');
   - text: <code>gray(false,381)</code> should return <code>425</code>.
-    testString: 'assert.equal(gray(false,381),425,"<code>gray(false,381)</code> should return <code>425</code>.");'
+    testString: assert.equal(gray(false,381),425,'<code>gray(false,381)</code> should return <code>425</code>.');
   - text: <code>gray(false,725)</code> should return <code>870</code>.
-    testString: 'assert.equal(gray(false,725),870,"<code>gray(false,725)</code> should return <code>870</code>.");'
+    testString: assert.equal(gray(false,725),870,'<code>gray(false,725)</code> should return <code>870</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-common-divisor.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-common-divisor.english.md
index 39a8d64de5..64312c67e3 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-common-divisor.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-common-divisor.english.md
@@ -20,21 +20,21 @@ Write a function that returns the greatest common divisor of two integers.
 ```yml
 tests:
   - text: <code>gcd</code> should be a function.
-    testString: 'assert(typeof gcd=="function","<code>gcd</code> should be a function.");'
+    testString: assert(typeof gcd=='function','<code>gcd</code> should be a function.');
   - text: <code>gcd(24,36)</code> should return a number.
-    testString: 'assert(typeof gcd(24,36)=="number","<code>gcd(24,36)</code> should return a number.");'
+    testString: assert(typeof gcd(24,36)=='number','<code>gcd(24,36)</code> should return a number.');
   - text: <code>gcd(24,36)</code> should return <code>12</code>.
-    testString: 'assert.equal(gcd(24,36),12,"<code>gcd(24,36)</code> should return <code>12</code>.");'
+    testString: assert.equal(gcd(24,36),12,'<code>gcd(24,36)</code> should return <code>12</code>.');
   - text: <code>gcd(30,48)</code> should return <code>6</code>.
-    testString: 'assert.equal(gcd(30,48),6,"<code>gcd(30,48)</code> should return <code>6</code>.");'
+    testString: assert.equal(gcd(30,48),6,'<code>gcd(30,48)</code> should return <code>6</code>.');
   - text: <code>gcd(10,15)</code> should return <code>5</code>.
-    testString: 'assert.equal(gcd(10,15),5,"<code>gcd(10,15)</code> should return <code>5</code>.");'
+    testString: assert.equal(gcd(10,15),5,'<code>gcd(10,15)</code> should return <code>5</code>.');
   - text: <code>gcd(100,25)</code> should return <code>25</code>.
-    testString: 'assert.equal(gcd(100,25),25,"<code>gcd(100,25)</code> should return <code>25</code>.");'
+    testString: assert.equal(gcd(100,25),25,'<code>gcd(100,25)</code> should return <code>25</code>.');
   - text: <code>gcd(13,250)</code> should return <code>1</code>.
-    testString: 'assert.equal(gcd(13,250),1,"<code>gcd(13,250)</code> should return <code>1</code>.");'
+    testString: assert.equal(gcd(13,250),1,'<code>gcd(13,250)</code> should return <code>1</code>.');
   - text: <code>gcd(1300,250)</code> should return <code>50</code>.
-    testString: 'assert.equal(gcd(1300,250),50,"<code>gcd(1300,250)</code> should return <code>50</code>.");'
+    testString: assert.equal(gcd(1300,250),50,'<code>gcd(1300,250)</code> should return <code>50</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-subsequential-sum.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-subsequential-sum.english.md
index 5b146b50a2..f17ce447f6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-subsequential-sum.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/greatest-subsequential-sum.english.md
@@ -21,21 +21,21 @@ An empty subsequence is considered to have the sum of \( 0 \);  thus if all elem
 ```yml
 tests:
   - text: <code>maximumSubsequence</code> should be a function.
-    testString: 'assert(typeof maximumSubsequence=="function","<code>maximumSubsequence</code> should be a function.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[0])+")</code> should return an array.
-    testString: 'assert(Array.isArray(maximumSubsequence(tests[0])),"<code>maximumSubsequence("+JSON.stringify(tests[0])+")</code> should return an array.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[0])+")</code> should return <code>"+JSON.stringify(results[0])+"</code>.
-    testString: 'assert.deepEqual(maximumSubsequence(tests[0]),results[0],"<code>maximumSubsequence("+JSON.stringify(tests[0])+")</code> should return <code>"+JSON.stringify(results[0])+"</code>.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[1])+")</code> should return <code>"+JSON.stringify(results[1])+"</code>.
-    testString: 'assert.deepEqual(maximumSubsequence(tests[1]),results[1],"<code>maximumSubsequence("+JSON.stringify(tests[1])+")</code> should return <code>"+JSON.stringify(results[1])+"</code>.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[2])+")</code> should return <code>"+JSON.stringify(results[2])+"</code>.
-    testString: 'assert.deepEqual(maximumSubsequence(tests[2]),results[2],"<code>maximumSubsequence("+JSON.stringify(tests[2])+")</code> should return <code>"+JSON.stringify(results[2])+"</code>.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[3])+")</code> should return <code>"+JSON.stringify(results[3])+"</code>.
-    testString: 'assert.deepEqual(maximumSubsequence(tests[3]),results[3],"<code>maximumSubsequence("+JSON.stringify(tests[3])+")</code> should return <code>"+JSON.stringify(results[3])+"</code>.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[4])+")</code> should return <code>"+JSON.stringify(results[4])+"</code>.
-    testString: 'assert.deepEqual(maximumSubsequence(tests[4]),results[4],"<code>maximumSubsequence("+JSON.stringify(tests[4])+")</code> should return <code>"+JSON.stringify(results[4])+"</code>.");'
-  - text: <code>maximumSubsequence("+JSON.stringify(tests[5])+")</code> should return <code>"+JSON.stringify(results[5])+"</code>.
-    testString: 'assert.deepEqual(maximumSubsequence(tests[5]),results[5],"<code>maximumSubsequence("+JSON.stringify(tests[5])+")</code> should return <code>"+JSON.stringify(results[5])+"</code>.");'
+    testString: assert(typeof maximumSubsequence=='function','<code>maximumSubsequence</code> should be a function.');
+  - text: <code>maximumSubsequence([1,2,-1,3,10,-10])</code> should return an array.
+    testString: assert(Array.isArray(maximumSubsequence([1,2,-1,3,10,-10])),'<code>maximumSubsequence([1,2,-1,3,10,-10])</code> should return an array.');
+  - text: <code>maximumSubsequence([1,2,-1,3,10,-10])</code> should return <code>[ 1, 2, -1, 3, 10 ]</code>.
+    testString: assert.deepEqual(maximumSubsequence([1,2,-1,3,10,-10]), [ 1, 2, -1, 3, 10 ],'<code>maximumSubsequence([1,2,-1,3,10,-10])</code> should return <code>[ 1, 2, -1, 3, 10 ]</code>.');
+  - text: <code>maximumSubsequence([0, 8, 10, -2, -4, -1, -5, -3])</code> should return <code>[ 0, 8, 10 ]</code>.
+    testString: assert.deepEqual(maximumSubsequence([0, 8, 10, -2, -4, -1, -5, -3]), [ 0, 8, 10 ],'<code>maximumSubsequence([0, 8, 10, -2, -4, -1, -5, -3])</code> should return <code>[ 0, 8, 10 ]</code>.');
+  - text: <code>maximumSubsequence([9, 9, -10, 1])</code> should return <code>[ 9, 9 ]</code>.
+    testString: assert.deepEqual(maximumSubsequence([9, 9, -10, 1]), [ 9, 9 ],'<code>maximumSubsequence([9, 9, -10, 1])</code> should return <code>[ 9, 9 ]</code>.');
+  - text: <code>maximumSubsequence([7, 1, -5, -3, -8, 1]</code> should return <code>[ 7, 1 ]</code>.
+    testString: assert.deepEqual(maximumSubsequence([7, 1, -5, -3, -8, 1]), [ 7, 1 ],'<code>maximumSubsequence([7, 1, -5, -3, -8, 1]</code> should return <code>[ 7, 1 ]</code>.');
+  - text: <code>maximumSubsequence([-3, 6, -1, 4, -4, -6])</code> should return <code>[ 6, -1, 4 ]</code>.
+    testString: assert.deepEqual(maximumSubsequence([-3, 6, -1, 4, -4, -6]), [ 6, -1, 4 ],'<code>maximumSubsequence([-3, 6, -1, 4, -4, -6])</code> should return <code>[ 6, -1, 4 ]</code>.');
+  - text: <code>maximumSubsequence([-1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1])</code> should return <code>[ 3, 5, 6, -2, -1, 4 ]</code>.
+    testString: assert.deepEqual(maximumSubsequence([-1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1]), [ 3, 5, 6, -2, -1, 4 ],'<code>maximumSubsequence([-1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1])</code> should return <code>[ 3, 5, 6, -2, -1, 4 ]</code>.');
 
 ```
 
@@ -54,16 +54,6 @@ function maximumSubsequence (population) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hailstone-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hailstone-sequence.english.md
index 10fbabff5c..6b145fa56c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hailstone-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hailstone-sequence.english.md
@@ -29,9 +29,9 @@ Show the number less than 100,000 which has the longest hailstone sequence toget
 ```yml
 tests:
   - text: <code>hailstoneSequence</code> is a function.
-    testString: 'assert(typeof hailstoneSequence === "function", "<code>hailstoneSequence</code> is a function.");'
-  - text: '<code>hailstoneSequence()</code> should return <code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code>'
-    testString: 'assert.deepEqual(hailstoneSequence(), res, "<code>hailstoneSequence()</code> should return <code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code>");'
+    testString: assert(typeof hailstoneSequence === 'function', '<code>hailstoneSequence</code> is a function.');
+  - text: <code>hailstoneSequence()</code> should return <code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code>
+    testString: assert.deepEqual(hailstoneSequence(), res, '<code>hailstoneSequence()</code> should return <code>[[27,82,41,124,8,4,2,1], [351, 77031]]</code>');
 
 ```
 
@@ -59,7 +59,7 @@ function hailstoneSequence () {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const res = [[27, 82, 41, 124, 8, 4, 2, 1], [351, 77031]];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/happy-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/happy-numbers.english.md
index 69ddee960c..186442168f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/happy-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/happy-numbers.english.md
@@ -22,31 +22,31 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>happy</code> is a function.
-    testString: 'assert(typeof happy === "function", "<code>happy</code> is a function.");'
+    testString: assert(typeof happy === 'function', '<code>happy</code> is a function.');
   - text: <code>happy(1)</code> should return a boolean.
-    testString: 'assert(typeof happy(1) === "boolean", "<code>happy(1)</code> should return a boolean.");'
+    testString: assert(typeof happy(1) === 'boolean', '<code>happy(1)</code> should return a boolean.');
   - text: <code>happy(1)</code> should return true.
-    testString: 'assert(happy(1), "<code>happy(1)</code> should return true.");'
+    testString: assert(happy(1), '<code>happy(1)</code> should return true.');
   - text: <code>happy(2)</code> should return false.
-    testString: 'assert(!happy(2), "<code>happy(2)</code> should return false.");'
+    testString: assert(!happy(2), '<code>happy(2)</code> should return false.');
   - text: <code>happy(7)</code> should return true.
-    testString: 'assert(happy(7), "<code>happy(7)</code> should return true.");'
+    testString: assert(happy(7), '<code>happy(7)</code> should return true.');
   - text: <code>happy(10)</code> should return true.
-    testString: 'assert(happy(10), "<code>happy(10)</code> should return true.");'
+    testString: assert(happy(10), '<code>happy(10)</code> should return true.');
   - text: <code>happy(13)</code> should return true.
-    testString: 'assert(happy(13), "<code>happy(13)</code> should return true.");'
+    testString: assert(happy(13), '<code>happy(13)</code> should return true.');
   - text: <code>happy(19)</code> should return true.
-    testString: 'assert(happy(19), "<code>happy(19)</code> should return true.");'
+    testString: assert(happy(19), '<code>happy(19)</code> should return true.');
   - text: <code>happy(23)</code> should return true.
-    testString: 'assert(happy(23), "<code>happy(23)</code> should return true.");'
+    testString: assert(happy(23), '<code>happy(23)</code> should return true.');
   - text: <code>happy(28)</code> should return true.
-    testString: 'assert(happy(28), "<code>happy(28)</code> should return true.");'
+    testString: assert(happy(28), '<code>happy(28)</code> should return true.');
   - text: <code>happy(31)</code> should return true.
-    testString: 'assert(happy(31), "<code>happy(31)</code> should return true.");'
-  - text: '<code>happy(32)</code> should return true:.'
-    testString: 'assert(happy(32), "<code>happy(32)</code> should return true:.");'
+    testString: assert(happy(31), '<code>happy(31)</code> should return true.');
+  - text: <code>happy(32)</code> should return true:.
+    testString: assert(happy(32), '<code>happy(32)</code> should return true:.');
   - text: <code>happy(33)</code> should return false.
-    testString: 'assert(!happy(33), "<code>happy(33)</code> should return false.");'
+    testString: assert(!happy(33), '<code>happy(33)</code> should return false.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/harshad-or-niven-series.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/harshad-or-niven-series.english.md
index 0d9ebe50b6..971800a110 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/harshad-or-niven-series.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/harshad-or-niven-series.english.md
@@ -23,9 +23,9 @@ Task:
 ```yml
 tests:
   - text: <code>isHarshadOrNiven</code> is a function.
-    testString: 'assert(typeof isHarshadOrNiven === "function", "<code>isHarshadOrNiven</code> is a function.");'
+    testString: assert(typeof isHarshadOrNiven === 'function', '<code>isHarshadOrNiven</code> is a function.');
   - text: '<code>isHarshadOrNiven()</code> should return <code>{"firstTwenty": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42],"firstOver1000": 1002}</code>'
-    testString: 'assert.deepEqual(isHarshadOrNiven(), res, "<code>isHarshadOrNiven()</code> should return <code>{"firstTwenty": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42],"firstOver1000": 1002}</code>");'
+    testString: 'assert.deepEqual(isHarshadOrNiven(), res, ''<code>isHarshadOrNiven()</code> should return <code>{"firstTwenty": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42],"firstOver1000": 1002}</code>'');'
 
 ```
 
@@ -55,7 +55,10 @@ function isHarshadOrNiven () {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const res = {
+  firstTwenty: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42],
+  firstOver1000: 1002
+};
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-from-two-arrays.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-from-two-arrays.english.md
index b4eac36adb..a8cdbfd902 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-from-two-arrays.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-from-two-arrays.english.md
@@ -23,19 +23,19 @@ Related task:
 ```yml
 tests:
   - text: <code>arrToObj</code> is a function.
-    testString: 'assert(typeof arrToObj === "function", "<code>arrToObj</code> is a function.");'
+    testString: assert(typeof arrToObj === 'function', '<code>arrToObj</code> is a function.');
   - text: '<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: "e" }</code>'
-    testString: 'assert.deepEqual(arrToObj(...testCases[0]), res[0], "<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: "e" }</code>");'
+    testString: 'assert.deepEqual(arrToObj(...testCases[0]), res[0], ''<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: "e" }</code>'');'
   - text: '<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: undefined }</code>'
-    testString: 'assert.deepEqual(arrToObj(...testCases[1]), res[1], "<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: undefined }</code>");'
+    testString: 'assert.deepEqual(arrToObj(...testCases[1]), res[1], ''<code>arrToObj([1, 2, 3, 4, 5], ["a", "b", "c", "d"])</code> should return <code>{ 1: "a", 2: "b", 3: "c", 4: "d", 5: undefined }</code>'');'
   - text: '<code>arrToObj([1, 2, 3], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c" }</code>'
-    testString: 'assert.deepEqual(arrToObj(...testCases[2]), res[2], "<code>arrToObj([1, 2, 3], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c" }</code>");'
+    testString: 'assert.deepEqual(arrToObj(...testCases[2]), res[2], ''<code>arrToObj([1, 2, 3], ["a", "b", "c", "d", "e"])</code> should return <code>{ 1: "a", 2: "b", 3: "c" }</code>'');'
   - text: '<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": 5 }</code>'
-    testString: 'assert.deepEqual(arrToObj(...testCases[3]), res[3], "<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": 5 }</code>");'
+    testString: 'assert.deepEqual(arrToObj(...testCases[3]), res[3], ''<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": 5 }</code>'');'
   - text: '<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": undefined }</code>'
-    testString: 'assert.deepEqual(arrToObj(...testCases[4]), res[4], "<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": undefined }</code>");'
+    testString: 'assert.deepEqual(arrToObj(...testCases[4]), res[4], ''<code>arrToObj(["a", "b", "c", "d", "e"], [1, 2, 3, 4])</code> should return <code>{ "a": 1, "b": 2, "c": 3 , "d": 4, "e": undefined }</code>'');'
   - text: '<code>arrToObj(["a", "b", "c"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3  }</code>'
-    testString: 'assert.deepEqual(arrToObj(...testCases[5]), res[5], "<code>arrToObj(["a", "b", "c"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3  }</code>");'
+    testString: 'assert.deepEqual(arrToObj(...testCases[5]), res[5], ''<code>arrToObj(["a", "b", "c"], [1, 2, 3, 4, 5])</code> should return <code>{ "a": 1, "b": 2, "c": 3  }</code>'');'
 
 ```
 
@@ -60,7 +60,23 @@ function arrToObj (keys, vals) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [
+  [[1, 2, 3, 4, 5], ['a', 'b', 'c', 'd', 'e']],
+  [[1, 2, 3, 4, 5], ['a', 'b', 'c', 'd']],
+  [[1, 2, 3], ['a', 'b', 'c', 'd', 'e']],
+  [['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4, 5]],
+  [['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4]],
+  [['a', 'b', 'c'], [1, 2, 3, 4, 5]]
+];
+
+const res = [
+  { 1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: 'e' },
+  { 1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: undefined },
+  { 1: 'a', 2: 'b', 3: 'c' },
+  { a: 1, b: 2, c: 3, d: 4, e: 5 },
+  { a: 1, b: 2, c: 3, d: 4, e: undefined },
+  { a: 1, b: 2, c: 3 }
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-join.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-join.english.md
index ea0cfb374c..45260002e6 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-join.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hash-join.english.md
@@ -172,9 +172,9 @@ Test-case
 ```yml
 tests:
   - text: <code>hashJoin</code> is a function.
-    testString: 'assert(typeof hashJoin === "function", "<code>hashJoin</code> is a function.");'
+    testString: assert(typeof hashJoin === 'function', '<code>hashJoin</code> is a function.');
   - text: '<code>hashJoin([{ age: 27, name: "Jonah" }, { age: 18, name: "Alan" }, { age: 28, name: "Glory" }, { age: 18, name: "Popeye" }, { age: 28, name: "Alan" }], [{ character: "Jonah", nemesis: "Whales" }, { character: "Jonah", nemesis: "Spiders" }, { character: "Alan", nemesis: "Ghosts" }, { character:"Alan", nemesis: "Zombies" }, { character: "Glory", nemesis: "Buffy" }, { character: "Bob", nemesis: "foo" }])</code> should return <code>[{"A_age": 27,"A_name": "Jonah", "B_character": "Jonah", "B_nemesis": "Whales"}, {"A_age": 27,"A_name": "Jonah", "B_character": "Jonah", "B_nemesis": "Spiders"}, {"A_age": 18,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Ghosts"}, {"A_age": 18,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Zombies"}, {"A_age": 28,"A_name": "Glory", "B_character": "Glory", "B_nemesis": "Buffy"}, {"A_age": 28,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Ghosts"}, {"A_age": 28,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Zombies"}]</code>'
-    testString: 'assert.deepEqual(hashJoin(hash1, hash2), res, "<code>hashJoin([{ age: 27, name: "Jonah" }, { age: 18, name: "Alan" }, { age: 28, name: "Glory" }, { age: 18, name: "Popeye" }, { age: 28, name: "Alan" }], [{ character: "Jonah", nemesis: "Whales" }, { character: "Jonah", nemesis: "Spiders" }, { character: "Alan", nemesis: "Ghosts" }, { character:"Alan", nemesis: "Zombies" }, { character: "Glory", nemesis: "Buffy" }, { character: "Bob", nemesis: "foo" }])</code> should return <code>[{"A_age": 27,"A_name": "Jonah", "B_character": "Jonah", "B_nemesis": "Whales"}, {"A_age": 27,"A_name": "Jonah", "B_character": "Jonah", "B_nemesis": "Spiders"}, {"A_age": 18,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Ghosts"}, {"A_age": 18,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Zombies"}, {"A_age": 28,"A_name": "Glory", "B_character": "Glory", "B_nemesis": "Buffy"}, {"A_age": 28,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Ghosts"}, {"A_age": 28,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Zombies"}]</code>");'
+    testString: 'assert.deepEqual(hashJoin(hash1, hash2), res, ''<code>hashJoin([{ age: 27, name: "Jonah" }, { age: 18, name: "Alan" }, { age: 28, name: "Glory" }, { age: 18, name: "Popeye" }, { age: 28, name: "Alan" }], [{ character: "Jonah", nemesis: "Whales" }, { character: "Jonah", nemesis: "Spiders" }, { character: "Alan", nemesis: "Ghosts" }, { character:"Alan", nemesis: "Zombies" }, { character: "Glory", nemesis: "Buffy" }, { character: "Bob", nemesis: "foo" }])</code> should return <code>[{"A_age": 27,"A_name": "Jonah", "B_character": "Jonah", "B_nemesis": "Whales"}, {"A_age": 27,"A_name": "Jonah", "B_character": "Jonah", "B_nemesis": "Spiders"}, {"A_age": 18,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Ghosts"}, {"A_age": 18,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Zombies"}, {"A_age": 28,"A_name": "Glory", "B_character": "Glory", "B_nemesis": "Buffy"}, {"A_age": 28,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Ghosts"}, {"A_age": 28,"A_name": "Alan", "B_character": "Alan", "B_nemesis": "Zombies"}]</code>'');'
 
 ```
 
@@ -199,7 +199,35 @@ function hashJoin (hash1, hash2) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const hash1 = [
+    { age: 27, name: 'Jonah' },
+    { age: 18, name: 'Alan' },
+    { age: 28, name: 'Glory' },
+    { age: 18, name: 'Popeye' },
+    { age: 28, name: 'Alan' }
+];
+
+const hash2 = [
+    { character: 'Jonah', nemesis: 'Whales' },
+    { character: 'Jonah', nemesis: 'Spiders' },
+    { character: 'Alan', nemesis: 'Ghosts' },
+    { character: 'Alan', nemesis: 'Zombies' },
+    { character: 'Glory', nemesis: 'Buffy' },
+    { character: 'Bob', nemesis: 'foo' }
+];
+
+const res = [
+    { A_age: 27, A_name: 'Jonah', B_character: 'Jonah', B_nemesis: 'Whales' },
+    { A_age: 27, A_name: 'Jonah', B_character: 'Jonah', B_nemesis: 'Spiders' },
+    { A_age: 18, A_name: 'Alan', B_character: 'Alan', B_nemesis: 'Ghosts' },
+    { A_age: 18, A_name: 'Alan', B_character: 'Alan', B_nemesis: 'Zombies' },
+    { A_age: 28, A_name: 'Glory', B_character: 'Glory', B_nemesis: 'Buffy' },
+    { A_age: 28, A_name: 'Alan', B_character: 'Alan', B_nemesis: 'Ghosts' },
+    { A_age: 28, A_name: 'Alan', B_character: 'Alan', B_nemesis: 'Zombies' }
+];
+
+const bench1 = [{ name: 'u2v7v', num: 1 }, { name: 'n53c8', num: 10 }, { name: 'oysce', num: 9 }, { name: '0mto2s', num: 1 }, { name: 'vkh5id', num: 4 }, { name: '5od0cf', num: 8 }, { name: 'uuulue', num: 10 }, { name: '3rgsbi', num: 9 }, { name: 'kccv35r', num: 4 }, { name: '80un74', num: 9 }, { name: 'h4pp3', num: 6 }, { name: '51bit', num: 7 }, { name: 'j9ndf', num: 8 }, { name: 'vf3u1', num: 10 }, { name: 'g0bw0om', num: 10 }, { name: 'j031x', num: 7 }, { name: 'ij3asc', num: 9 }, { name: 'byv83y', num: 8 }, { name: 'bjzp4k', num: 4 }, { name: 'f3kbnm', num: 10 }];
+const bench2 = [{ friend: 'o8b', num: 8 }, { friend: 'ye', num: 2 }, { friend: '32i', num: 5 }, { friend: 'uz', num: 3 }, { friend: 'a5k', num: 4 }, { friend: 'uad', num: 7 }, { friend: '3w5', num: 10 }, { friend: 'vw', num: 10 }, { friend: 'ah', num: 4 }, { friend: 'qv', num: 7 }, { friend: 'ozv', num: 2 }, { friend: '9ri', num: 10 }, { friend: '7nu', num: 4 }, { friend: 'w3', num: 9 }, { friend: 'tgp', num: 8 }, { friend: 'ibs', num: 1 }, { friend: 'ss7', num: 6 }, { friend: 'g44', num: 9 }, { friend: 'tab', num: 9 }, { friend: 'zem', num: 10 }];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/heronian-triangles.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/heronian-triangles.english.md
index 48c8fb849d..5ab654789a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/heronian-triangles.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/heronian-triangles.english.md
@@ -26,15 +26,15 @@ Task:
 ```yml
 tests:
   - text: <code>heronianTriangle</code> is a function.
-    testString: 'assert(typeof heronianTriangle === "function", "<code>heronianTriangle</code> is a function.");'
-  - text: '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17]]</code>'
-    testString: 'assert.deepEqual(heronianTriangle(testCases[0]), res[0], "<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17]]</code>");'
-  - text: '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15]],</code>'
-    testString: 'assert.deepEqual(heronianTriangle(testCases[1]), res[1], "<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15]],</code>");'
-  - text: '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53]],</code>'
-    testString: 'assert.deepEqual(heronianTriangle(testCases[2]), res[2], "<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53]],</code>");'
-  - text: '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53], [19, 20, 37],[16, 17, 17], [17, 17, 30], [16, 25, 39], [13, 20, 21]]</code>'
-    testString: 'assert.deepEqual(heronianTriangle(testCases[3]), res[3], "<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53], [19, 20, 37],[16, 17, 17], [17, 17, 30], [16, 25, 39], [13, 20, 21]]</code>");'
+    testString: assert(typeof heronianTriangle === 'function', '<code>heronianTriangle</code> is a function.');
+  - text: <code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17]]</code>
+    testString: assert.deepEqual(heronianTriangle(testCases[0]), res[0], '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17]]</code>');
+  - text: <code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15]],</code>
+    testString: assert.deepEqual(heronianTriangle(testCases[1]), res[1], '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15]],</code>');
+  - text: <code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53]],</code>
+    testString: assert.deepEqual(heronianTriangle(testCases[2]), res[2], '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53]],</code>');
+  - text: <code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53], [19, 20, 37],[16, 17, 17], [17, 17, 30], [16, 25, 39], [13, 20, 21]]</code>
+    testString: assert.deepEqual(heronianTriangle(testCases[3]), res[3], '<code>heronianTriangle()</code> should return <code>[[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53], [19, 20, 37],[16, 17, 17], [17, 17, 30], [16, 25, 39], [13, 20, 21]]</code>');
 
 ```
 
@@ -61,7 +61,14 @@ function heronianTriangle (n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCases = [10, 15, 20, 25];
+
+const res = [
+  [[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17]],
+  [[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15]],
+  [[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53]],
+  [[3, 4, 5], [5, 5, 6], [5, 5, 8], [4, 13, 15], [5, 12, 13], [9, 10, 17], [3, 25, 26], [7, 15, 20], [10, 13, 13], [8, 15, 17], [13, 13, 24], [6, 25, 29], [11, 13, 20], [5, 29, 30], [13, 14, 15], [10, 17, 21], [7, 24, 25], [8, 29, 35], [12, 17, 25], [4, 51, 53], [19, 20, 37], [16, 17, 17], [17, 17, 30], [16, 25, 39], [13, 20, 21]]
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-figure-figure-sequences.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-figure-figure-sequences.english.md
index 09239e86d2..cd686cddd4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-figure-figure-sequences.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-figure-figure-sequences.english.md
@@ -31,29 +31,29 @@ Wikipedia: <a href="https://en.wikipedia.org/wiki/Hofstadter_sequence#Hofstadter
 ```yml
 tests:
   - text: <code>ffr</code> is a function.
-    testString: 'assert(typeof ffr === "function", "<code>ffr</code> is a function.");'
+    testString: assert(typeof ffr === 'function', '<code>ffr</code> is a function.');
   - text: <code>ffs</code> is a function.
-    testString: 'assert(typeof ffs === "function", "<code>ffs</code> is a function.");'
+    testString: assert(typeof ffs === 'function', '<code>ffs</code> is a function.');
   - text: <code>ffr</code> should return integer.
-    testString: 'assert(Number.isInteger(ffr(1)), "<code>ffr</code> should return integer.");'
+    testString: assert(Number.isInteger(ffr(1)), '<code>ffr</code> should return integer.');
   - text: <code>ffs</code> should return integer.
-    testString: 'assert(Number.isInteger(ffs(1)), "<code>ffs</code> should return integer.");'
+    testString: assert(Number.isInteger(ffs(1)), '<code>ffs</code> should return integer.');
   - text: <code>ffr()</code> should return <code>69</code>
-    testString: 'assert.equal(ffr(ffrParamRes[0][0]), ffrParamRes[0][1], "<code>ffr()</code> should return <code>69</code>");'
+    testString: assert.equal(ffr(ffrParamRes[0][0]), ffrParamRes[0][1], '<code>ffr()</code> should return <code>69</code>');
   - text: <code>ffr()</code> should return <code>1509</code>
-    testString: 'assert.equal(ffr(ffrParamRes[1][0]), ffrParamRes[1][1], "<code>ffr()</code> should return <code>1509</code>");'
+    testString: assert.equal(ffr(ffrParamRes[1][0]), ffrParamRes[1][1], '<code>ffr()</code> should return <code>1509</code>');
   - text: <code>ffr()</code> should return <code>5764</code>
-    testString: 'assert.equal(ffr(ffrParamRes[2][0]), ffrParamRes[2][1], "<code>ffr()</code> should return <code>5764</code>");'
+    testString: assert.equal(ffr(ffrParamRes[2][0]), ffrParamRes[2][1], '<code>ffr()</code> should return <code>5764</code>');
   - text: <code>ffr()</code> should return <code>526334</code>
-    testString: 'assert.equal(ffr(ffrParamRes[3][0]), ffrParamRes[3][1], "<code>ffr()</code> should return <code>526334</code>");'
+    testString: assert.equal(ffr(ffrParamRes[3][0]), ffrParamRes[3][1], '<code>ffr()</code> should return <code>526334</code>');
   - text: <code>ffs()</code> should return <code>14</code>
-    testString: 'assert.equal(ffs(ffsParamRes[0][0]), ffsParamRes[0][1], "<code>ffs()</code> should return <code>14</code>");'
+    testString: assert.equal(ffs(ffsParamRes[0][0]), ffsParamRes[0][1], '<code>ffs()</code> should return <code>14</code>');
   - text: <code>ffs()</code> should return <code>59</code>
-    testString: 'assert.equal(ffs(ffsParamRes[1][0]), ffsParamRes[1][1], "<code>ffs()</code> should return <code>59</code>");'
+    testString: assert.equal(ffs(ffsParamRes[1][0]), ffsParamRes[1][1], '<code>ffs()</code> should return <code>59</code>');
   - text: <code>ffs()</code> should return <code>112</code>
-    testString: 'assert.equal(ffs(ffsParamRes[2][0]), ffsParamRes[2][1], "<code>ffs()</code> should return <code>112</code>");'
+    testString: assert.equal(ffs(ffsParamRes[2][0]), ffsParamRes[2][1], '<code>ffs()</code> should return <code>112</code>');
   - text: <code>ffs()</code> should return <code>1041</code>
-    testString: 'assert.equal(ffs(ffsParamRes[3][0]), ffsParamRes[3][1], "<code>ffs()</code> should return <code>1041</code>");'
+    testString: assert.equal(ffs(ffsParamRes[3][0]), ffsParamRes[3][1], '<code>ffs()</code> should return <code>1041</code>');
 
 ```
 
@@ -82,7 +82,9 @@ function ffs(n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const ffrParamRes = [[10, 69], [50, 1509], [100, 5764], [1000, 526334]];
+const ffsParamRes = [[10, 14], [50, 59], [100, 112], [1000, 1041]];
+
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-q-sequence.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-q-sequence.english.md
index f3e8f6a438..4abc695b9a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-q-sequence.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/hofstadter-q-sequence.english.md
@@ -24,17 +24,17 @@ Implement the Hofstadter Q Sequence equation into JavaScript
 ```yml
 tests:
   - text: <code>hofstadterQ</code> is a function.
-    testString: 'assert(typeof hofstadterQ === "function", "<code>hofstadterQ</code> is a function.");'
+    testString: assert(typeof hofstadterQ === 'function', '<code>hofstadterQ</code> is a function.');
   - text: <code>hofstadterQ()</code> should return <code>integer</code>
-    testString: 'assert(Number.isInteger(hofstadterQ(1000)), "<code>hofstadterQ()</code> should return <code>integer</code>");'
+    testString: assert(Number.isInteger(hofstadterQ(1000)), '<code>hofstadterQ()</code> should return <code>integer</code>');
   - text: <code>hofstadterQ(1000)</code> should return <code>502</code>
-    testString: 'assert.equal(hofstadterQ(testCase[0]), res[0], "<code>hofstadterQ(1000)</code> should return <code>502</code>");'
+    testString: assert.equal(hofstadterQ(testCase[0]), res[0], '<code>hofstadterQ(1000)</code> should return <code>502</code>');
   - text: <code>hofstadterQ(1500)</code> should return <code>755</code>
-    testString: 'assert.equal(hofstadterQ(testCase[1]), res[1], "<code>hofstadterQ(1500)</code> should return <code>755</code>");'
+    testString: assert.equal(hofstadterQ(testCase[1]), res[1], '<code>hofstadterQ(1500)</code> should return <code>755</code>');
   - text: <code>hofstadterQ(2000)</code> should return <code>1005</code>
-    testString: 'assert.equal(hofstadterQ(testCase[2]), res[2], "<code>hofstadterQ(2000)</code> should return <code>1005</code>");'
+    testString: assert.equal(hofstadterQ(testCase[2]), res[2], '<code>hofstadterQ(2000)</code> should return <code>1005</code>');
   - text: <code>hofstadterQ(2500)</code> should return <code>1261</code>
-    testString: 'assert.equal(hofstadterQ(testCase[3]), res[3], "<code>hofstadterQ(2500)</code> should return <code>1261</code>");'
+    testString: assert.equal(hofstadterQ(testCase[3]), res[3], '<code>hofstadterQ(2500)</code> should return <code>1261</code>');
 
 ```
 
@@ -59,7 +59,8 @@ function hofstadterQ (n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testCase = [1000, 1500, 2000, 2500];
+const res = [502, 755, 1005, 1261];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/i-before-e-except-after-c.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/i-before-e-except-after-c.english.md
index 9efa5a5ed8..8fffe81204 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/i-before-e-except-after-c.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/i-before-e-except-after-c.english.md
@@ -24,21 +24,21 @@ Write a function that accepts a word and check if the word follows this rule. Th
 ```yml
 tests:
   - text: <code>IBeforeExceptC</code> should be a function.
-    testString: 'assert(typeof IBeforeExceptC=="function","<code>IBeforeExceptC</code> should be a function.");'
+    testString: assert(typeof IBeforeExceptC=='function','<code>IBeforeExceptC</code> should be a function.');
   - text: <code>IBeforeExceptC("receive")</code> should return a boolean.
-    testString: 'assert(typeof IBeforeExceptC("receive")=="boolean","<code>IBeforeExceptC("receive")</code> should return a boolean.");'
+    testString: assert(typeof IBeforeExceptC("receive")=='boolean','<code>IBeforeExceptC("receive")</code> should return a boolean.');
   - text: <code>IBeforeExceptC("receive")</code> should return <code>true</code>.
-    testString: 'assert.equal(IBeforeExceptC("receive"),true,"<code>IBeforeExceptC("receive")</code> should return <code>true</code>.");'
+    testString: assert.equal(IBeforeExceptC("receive"),true,'<code>IBeforeExceptC("receive")</code> should return <code>true</code>.');
   - text: <code>IBeforeExceptC("science")</code> should return <code>false</code>.
-    testString: 'assert.equal(IBeforeExceptC("science"),false,"<code>IBeforeExceptC("science")</code> should return <code>false</code>.");'
+    testString: assert.equal(IBeforeExceptC("science"),false,'<code>IBeforeExceptC("science")</code> should return <code>false</code>.');
   - text: <code>IBeforeExceptC("imperceivable")</code> should return <code>true</code>.
-    testString: 'assert.equal(IBeforeExceptC("imperceivable"),true,"<code>IBeforeExceptC("imperceivable")</code> should return <code>true</code>.");'
+    testString: assert.equal(IBeforeExceptC("imperceivable"),true,'<code>IBeforeExceptC("imperceivable")</code> should return <code>true</code>.');
   - text: <code>IBeforeExceptC("inconceivable")</code> should return <code>true</code>.
-    testString: 'assert.equal(IBeforeExceptC("inconceivable"),true,"<code>IBeforeExceptC("inconceivable")</code> should return <code>true</code>.");'
+    testString: assert.equal(IBeforeExceptC("inconceivable"),true,'<code>IBeforeExceptC("inconceivable")</code> should return <code>true</code>.');
   - text: <code>IBeforeExceptC("insufficient")</code> should return <code>false</code>.
-    testString: 'assert.equal(IBeforeExceptC("insufficient"),false,"<code>IBeforeExceptC("insufficient")</code> should return <code>false</code>.");'
+    testString: assert.equal(IBeforeExceptC("insufficient"),false,'<code>IBeforeExceptC("insufficient")</code> should return <code>false</code>.');
   - text: <code>IBeforeExceptC("omniscient")</code> should return <code>false</code>.
-    testString: 'assert.equal(IBeforeExceptC("omniscient"),false,"<code>IBeforeExceptC("omniscient")</code> should return <code>false</code>.");'
+    testString: assert.equal(IBeforeExceptC("omniscient"),false,'<code>IBeforeExceptC("omniscient")</code> should return <code>false</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iban.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iban.english.md
index b2e1d781f6..9c27c0629c 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iban.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iban.english.md
@@ -28,19 +28,19 @@ Write a function that takes IBAN string as parameter. If it is valid return true
 ```yml
 tests:
   - text: <code>isValid</code> should be a function.
-    testString: 'assert(typeof isValid=="function","<code>isValid</code> should be a function.");'
-  - text: <code>isValid(""+tests[0]+"")</code> should return a boolean.
-    testString: 'assert(typeof isValid(tests[0])=="boolean","<code>isValid(""+tests[0]+"")</code> should return a boolean.");'
-  - text: <code>isValid(""+tests[0]+"")</code> should return <code>true</code>.
-    testString: 'assert.equal(isValid(tests[0]),true,"<code>isValid(""+tests[0]+"")</code> should return <code>true</code>.");'
-  - text: <code>isValid(""+tests[1]+"")</code> should return <code>false</code>.
-    testString: 'assert.equal(isValid(tests[1]),false,"<code>isValid(""+tests[1]+"")</code> should return <code>false</code>.");'
-  - text: <code>isValid(""+tests[2]+"")</code> should return <code>false</code>.
-    testString: 'assert.equal(isValid(tests[2]),false,"<code>isValid(""+tests[2]+"")</code> should return <code>false</code>.");'
-  - text: <code>isValid(""+tests[3]+"")</code> should return <code>false</code>.
-    testString: 'assert.equal(isValid(tests[3]),false,"<code>isValid(""+tests[3]+"")</code> should return <code>false</code>.");'
-  - text: <code>isValid(""+tests[4]+"")</code> should return <code>true</code>.
-    testString: 'assert.equal(isValid(tests[4]),true,"<code>isValid(""+tests[4]+"")</code> should return <code>true</code>.");'
+    testString: assert(typeof isValid=='function','<code>isValid</code> should be a function.');
+  - text: <code>isValid("GB82 WEST 1234 5698 7654 32")</code> should return a boolean.
+    testString: assert(typeof isValid('GB82 WEST 1234 5698 7654 32')=='boolean','<code>isValid("GB82 WEST 1234 5698 7654 32")</code> should return a boolean.');
+  - text: <code>isValid("GB82 WEST 1234 5698 7654 32")</code> should return <code>true</code>.
+    testString: assert.equal(isValid('GB82 WEST 1234 5698 7654 32'),true,'<code>isValid("GB82 WEST 1234 5698 7654 32")</code> should return <code>true</code>.');
+  - text: <code>isValid("GB82 WEST 1.34 5698 7654 32")</code> should return <code>false</code>.
+    testString: assert.equal(isValid('GB82 WEST 1.34 5698 7654 32'),false,'<code>isValid("GB82 WEST 1.34 5698 7654 32")</code> should return <code>false</code>.');
+  - text: <code>isValid("GB82 WEST 1234 5698 7654 325")</code> should return <code>false</code>.
+    testString: assert.equal(isValid('GB82 WEST 1234 5698 7654 325'),false,'<code>isValid("GB82 WEST 1234 5698 7654 325")</code> should return <code>false</code>.');
+  - text: <code>isValid("GB82 TEST 1234 5698 7654 32")</code> should return <code>false</code>.
+    testString: assert.equal(isValid('GB82 TEST 1234 5698 7654 32'),false,'<code>isValid("GB82 TEST 1234 5698 7654 32")</code> should return <code>false</code>.');
+  - text: <code>isValid("SA03 8000 0000 6080 1016 7519")</code> should return <code>true</code>.
+    testString: assert.equal(isValid('SA03 8000 0000 6080 1016 7519'),true,'<code>isValid("SA03 8000 0000 6080 1016 7519")</code> should return <code>true</code>.');
 
 ```
 
@@ -59,16 +59,6 @@ function isValid (iban) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
@@ -87,12 +77,12 @@ function isValid (iban) {
   	MC:27, MR:27, SM:27, AL:28, AZ:28, CY:28, DO:28, GT:28,
   	HU:28, LB:28, PL:28, BR:29, PS:29, KW:30, MU:30, MT:31
   }
-	iban = iban.replace(/\s/g, ")
+	iban = iban.replace(/\s/g, '')
 	if (!iban.match(/^[\dA-Z]+$/)) return false
 	var len = iban.length
 	if (len != ibanLen[iban.substr(0,2)]) return false
 	iban = iban.substr(4) + iban.substr(0,4)
-	for (var s=", i=0; i<len; i+=1) s+=parseInt(iban.charAt(i),36)
+	for (var s='', i=0; i<len; i+=1) s+=parseInt(iban.charAt(i),36)
 	for (var m=s.substr(0,15)%97, s=s.substr(15); s; s=s.substr(13)) m=(m+s.substr(0,13))%97
 	return m == 1
 }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/identity-matrix.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/identity-matrix.english.md
index 11388bce6d..1f2b0bf2cd 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/identity-matrix.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/identity-matrix.english.md
@@ -24,17 +24,17 @@ Write a function that takes a number 'n' as a parameter and returns the identity
 ```yml
 tests:
   - text: <code>idMatrix</code> should be a function.
-    testString: 'assert(typeof idMatrix=="function","<code>idMatrix</code> should be a function.");'
+    testString: assert(typeof idMatrix=='function','<code>idMatrix</code> should be a function.');
   - text: <code>idMatrix(1)</code> should return an array.
-    testString: 'assert(Array.isArray(idMatrix(1)),"<code>idMatrix(1)</code> should return an array.");'
-  - text: <code>idMatrix(1)</code> should return <code>"+JSON.stringify(results[0])+"</code>.
-    testString: 'assert.deepEqual(idMatrix(1),results[0],"<code>idMatrix(1)</code> should return <code>"+JSON.stringify(results[0])+"</code>.");'
-  - text: <code>idMatrix(2)</code> should return <code>"+JSON.stringify(results[1])+"</code>.
-    testString: 'assert.deepEqual(idMatrix(2),results[1],"<code>idMatrix(2)</code> should return <code>"+JSON.stringify(results[1])+"</code>.");'
-  - text: <code>idMatrix(3)</code> should return <code>"+JSON.stringify(results[2])+"</code>.
-    testString: 'assert.deepEqual(idMatrix(3),results[2],"<code>idMatrix(3)</code> should return <code>"+JSON.stringify(results[2])+"</code>.");'
-  - text: <code>idMatrix(4)</code> should return <code>"+JSON.stringify(results[3])+"</code>.
-    testString: 'assert.deepEqual(idMatrix(4),results[3],"<code>idMatrix(4)</code> should return <code>"+JSON.stringify(results[3])+"</code>.");'
+    testString: assert(Array.isArray(idMatrix(1)),'<code>idMatrix(1)</code> should return an array.');
+  - text: <code>idMatrix(1)</code> should return <code>'+JSON.stringify(results[0])+'</code>.
+    testString: assert.deepEqual(idMatrix(1),results[0],'<code>idMatrix(1)</code> should return <code>'+JSON.stringify(results[0])+'</code>.');
+  - text: <code>idMatrix(2)</code> should return <code>'+JSON.stringify(results[1])+'</code>.
+    testString: assert.deepEqual(idMatrix(2),results[1],'<code>idMatrix(2)</code> should return <code>'+JSON.stringify(results[1])+'</code>.');
+  - text: <code>idMatrix(3)</code> should return <code>'+JSON.stringify(results[2])+'</code>.
+    testString: assert.deepEqual(idMatrix(3),results[2],'<code>idMatrix(3)</code> should return <code>'+JSON.stringify(results[2])+'</code>.');
+  - text: <code>idMatrix(4)</code> should return <code>'+JSON.stringify(results[3])+'</code>.
+    testString: assert.deepEqual(idMatrix(4),results[3],'<code>idMatrix(4)</code> should return <code>'+JSON.stringify(results[3])+'</code>.');
 
 ```
 
@@ -58,7 +58,10 @@ function idMatrix (n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+let results=[[ [ 1 ] ],
+[ [ 1, 0 ], [ 0, 1 ] ],
+[ [ 1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, 1 ] ],
+[ [ 1, 0, 0, 0 ], [ 0, 1, 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ]]
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iterated-digits-squaring.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iterated-digits-squaring.english.md
index cc569b95be..b8fa1c578b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iterated-digits-squaring.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/iterated-digits-squaring.english.md
@@ -23,21 +23,21 @@ Write a function that takes a number as a parameter and returns 1 or 89 after pe
 ```yml
 tests:
   - text: <code>iteratedSquare</code> should be a function.
-    testString: 'assert(typeof iteratedSquare=="function","<code>iteratedSquare</code> should be a function.");'
+    testString: assert(typeof iteratedSquare=='function','<code>iteratedSquare</code> should be a function.');
   - text: <code>iteratedSquare(4)</code> should return a number.
-    testString: 'assert(typeof iteratedSquare(4)=="number","<code>iteratedSquare(4)</code> should return a number.");'
+    testString: assert(typeof iteratedSquare(4)=='number','<code>iteratedSquare(4)</code> should return a number.');
   - text: <code>iteratedSquare(4)</code> should return <code>89</code>.
-    testString: 'assert.equal(iteratedSquare(4),89,"<code>iteratedSquare(4)</code> should return <code>89</code>.");'
+    testString: assert.equal(iteratedSquare(4),89,'<code>iteratedSquare(4)</code> should return <code>89</code>.');
   - text: <code>iteratedSquare(7)</code> should return <code>1</code>.
-    testString: 'assert.equal(iteratedSquare(7),1,"<code>iteratedSquare(7)</code> should return <code>1</code>.");'
+    testString: assert.equal(iteratedSquare(7),1,'<code>iteratedSquare(7)</code> should return <code>1</code>.');
   - text: <code>iteratedSquare(15)</code> should return <code>89</code>.
-    testString: 'assert.equal(iteratedSquare(15),89,"<code>iteratedSquare(15)</code> should return <code>89</code>.");'
+    testString: assert.equal(iteratedSquare(15),89,'<code>iteratedSquare(15)</code> should return <code>89</code>.');
   - text: <code>iteratedSquare(20)</code> should return <code>89</code>.
-    testString: 'assert.equal(iteratedSquare(20),89,"<code>iteratedSquare(20)</code> should return <code>89</code>.");'
+    testString: assert.equal(iteratedSquare(20),89,'<code>iteratedSquare(20)</code> should return <code>89</code>.');
   - text: <code>iteratedSquare(70)</code> should return <code>1</code>.
-    testString: 'assert.equal(iteratedSquare(70),1,"<code>iteratedSquare(70)</code> should return <code>1</code>.");'
+    testString: assert.equal(iteratedSquare(70),1,'<code>iteratedSquare(70)</code> should return <code>1</code>.');
   - text: <code>iteratedSquare(100)</code> should return <code>1</code>.
-    testString: 'assert.equal(iteratedSquare(100),1,"<code>iteratedSquare(100)</code> should return <code>1</code>.");'
+    testString: assert.equal(iteratedSquare(100),1,'<code>iteratedSquare(100)</code> should return <code>1</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jaro-distance.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jaro-distance.english.md
index a47fbc17bf..3228553354 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jaro-distance.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jaro-distance.english.md
@@ -29,19 +29,19 @@ Write a function a that takes two strings as parameters and returns the associat
 ```yml
 tests:
   - text: <code>jaro</code> should be a function.
-    testString: 'assert(typeof jaro=="function","<code>jaro</code> should be a function.");'
-  - text: <code>jaro(""+tests[0][0]+"",""+tests[0][1]+"")</code> should return a number.
-    testString: 'assert(typeof jaro(tests[0][0],tests[0][1])=="number","<code>jaro()</code> should return a number.");'
-  - text: <code>jaro(""+tests[0][0]+"",""+tests[0][1]+"")</code> should return <code>"+results[0]+"</code>.
-    testString: 'assert.equal(jaro(tests[0][0],tests[0][1]),results[0],"<code>jaro(""+tests[0][0]+"",""+tests[0][1]+"")</code> should return <code>"+results[0]+"</code>.");'
-  - text: <code>jaro(""+tests[1][0]+"",""+tests[1][1]+"")</code> should return <code>"+results[1]+"</code>.
-    testString: 'assert.equal(jaro(tests[1][0],tests[1][1]),results[1],"<code>jaro(""+tests[1][0]+"",""+tests[1][1]+"")</code> should return <code>"+results[1]+"</code>.");'
-  - text: <code>jaro(""+tests[2][0]+"",""+tests[2][1]+"")</code> should return <code>"+results[2]+"</code>.
-    testString: 'assert.equal(jaro(tests[2][0],tests[2][1]),results[2],"<code>jaro(""+tests[2][0]+"",""+tests[2][1]+"")</code> should return <code>"+results[2]+"</code>.");'
-  - text: <code>jaro(""+tests[3][0]+"",""+tests[3][1]+"")</code> should return <code>"+results[3]+"</code>.
-    testString: 'assert.equal(jaro(tests[3][0],tests[3][1]),results[3],"<code>jaro(""+tests[3][0]+"",""+tests[3][1]+"")</code> should return <code>"+results[3]+"</code>.");'
-  - text: <code>jaro(""+tests[4][0]+"",""+tests[4][1]+"")</code> should return <code>"+results[4]+"</code>.
-    testString: 'assert.equal(jaro(tests[4][0],tests[4][1]),results[4],"<code>jaro(""+tests[4][0]+"",""+tests[4][1]+"")</code> should return <code>"+results[4]+"</code>.");'
+    testString: assert(typeof jaro=='function','<code>jaro</code> should be a function.');
+  - text: <code>jaro("MARTHA", "MARHTA")</code> should return a number.
+    testString: assert(typeof jaro('MARTHA', 'MARHTA')=='number','<code>jaro()</code> should return a number.');
+  - text: <code>jaro("MARTHA", "MARHTA")</code> should return <code>0.9444444444444445</code>.
+    testString: assert.equal(jaro('MARTHA', 'MARHTA'), 0.9444444444444445,'<code>jaro("MARTHA", "MARHTA")</code> should return <code>0.9444444444444445</code>.');
+  - text: <code>jaro("DIXON", "DICKSONX")</code> should return <code>0.7666666666666666</code>.
+    testString: assert.equal(jaro('DIXON', 'DICKSONX'), 0.7666666666666666,'<code>jaro("DIXON", "DICKSONX")</code> should return <code>0.7666666666666666</code>.');
+  - text: <code>jaro("JELLYFISH", "SMELLYFISH")</code> should return <code>0.8962962962962964</code>.
+    testString: assert.equal(jaro('JELLYFISH', 'SMELLYFISH'), 0.8962962962962964,'<code>jaro("JELLYFISH", "SMELLYFISH")</code> should return <code>0.8962962962962964</code>.');
+  - text: <code>jaro("HELLOS", "CHELLO")</code> should return <code>0.888888888888889</code>.
+    testString: assert.equal(jaro('HELLOS', 'CHELLO'), 0.888888888888889,'<code>jaro("HELLOS", "CHELLO")</code> should return <code>0.888888888888889</code>.');
+  - text: <code>jaro("ABCD", "BCDA")</code> should return <code>0.8333333333333334</code>.
+    testString: assert.equal(jaro('ABCD', 'BCDA'), 0.8333333333333334,'<code>jaro("ABCD", "BCDA")</code> should return <code>0.8333333333333334</code>.');
 
 ```
 
@@ -60,16 +60,6 @@ function jaro (s, t) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jortsort.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jortsort.english.md
index 129b662bb8..42fc3d4692 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jortsort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/jortsort.english.md
@@ -21,21 +21,21 @@ jortSort is a function that takes a single array of comparable objects as its ar
 ```yml
 tests:
   - text: <code>jortsort</code> should be a function.
-    testString: 'assert(typeof jortsort=="function","<code>jortsort</code> should be a function.");'
-  - text: <code>jortsort("+JSON.stringify(tests[0])+")</code> should return a boolean.
-    testString: 'assert(typeof jortsort(tests[0].slice())=="boolean","<code>jortsort("+JSON.stringify(tests[0])+")</code> should return a boolean.");'
-  - text: <code>jortsort("+JSON.stringify(tests[0])+")</code> should return <code>true</code>.
-    testString: 'assert.equal(jortsort(tests[0].slice()),true,"<code>jortsort("+JSON.stringify(tests[0])+")</code> should return <code>true</code>.");'
-  - text: <code>jortsort("+JSON.stringify(tests[1])+")</code> should return <code>false</code>.
-    testString: 'assert.equal(jortsort(tests[1].slice()),false,"<code>jortsort("+JSON.stringify(tests[1])+")</code> should return <code>false</code>.");'
-  - text: <code>jortsort("+JSON.stringify(tests[2])+")</code> should return <code>false</code>.
-    testString: 'assert.equal(jortsort(tests[2].slice()),false,"<code>jortsort("+JSON.stringify(tests[2])+")</code> should return <code>false</code>.");'
-  - text: <code>jortsort("+JSON.stringify(tests[3])+")</code> should return <code>true</code>.
-    testString: 'assert.equal(jortsort(tests[3].slice()),true,"<code>jortsort("+JSON.stringify(tests[3])+")</code> should return <code>true</code>.");'
-  - text: <code>jortsort("+JSON.stringify(tests[4])+")</code> should return <code>false</code>.
-    testString: 'assert.equal(jortsort(tests[4].slice()),false,"<code>jortsort("+JSON.stringify(tests[4])+")</code> should return <code>false</code>.");'
-  - text: <code>jortsort("+JSON.stringify(tests[5])+")</code> should return <code>true</code>.
-    testString: 'assert.equal(jortsort(tests[5].slice()),true,"<code>jortsort("+JSON.stringify(tests[5])+")</code> should return <code>true</code>.");'
+    testString: assert(typeof jortsort=='function','<code>jortsort</code> should be a function.');
+  - text: <code>jortsort([1,2,3,4,5])</code> should return a boolean.
+    testString: assert(typeof jortsort([1,2,3,4,5])=='boolean','<code>jortsort([1,2,3,4,5])</code> should return a boolean.');
+  - text: <code>jortsort([1,2,3,4,5])</code> should return <code>true</code>.
+    testString: assert.equal(jortsort([1,2,3,4,5]),true,'<code>jortsort([1,2,3,4,5])</code> should return <code>true</code>.');
+  - text: <code>jortsort([1,2,13,4,5])</code> should return <code>false</code>.
+    testString: assert.equal(jortsort([1,2,13,4,5]),false,'<code>jortsort([1,2,13,4,5])</code> should return <code>false</code>.');
+  - text: <code>jortsort([12,4,51,2,4])</code> should return <code>false</code>.
+    testString: assert.equal(jortsort([12,4,51,2,4]),false,'<code>jortsort([12,4,51,2,4])</code> should return <code>false</code>.');
+  - text: <code>jortsort([1,2])</code> should return <code>true</code>.
+    testString: assert.equal(jortsort([1,2]),true,'<code>jortsort([1,2])</code> should return <code>true</code>.');
+  - text: <code>jortsort([5,4,3,2,1])</code> should return <code>false</code>.
+    testString: assert.equal(jortsort([5,4,3,2,1]),false,'<code>jortsort([5,4,3,2,1])</code> should return <code>false</code>.');
+  - text: <code>jortsort([1,1,1,1,1])</code> should return <code>true</code>.
+    testString: assert.equal(jortsort([1,1,1,1,1]),true,'<code>jortsort([1,1,1,1,1])</code> should return <code>true</code>.');
 
 ```
 
@@ -54,16 +54,6 @@ function jortsort (array) {
 
 </div>
 
-
-### After Test
-<div id='js-teardown'>
-
-```js
-console.info('after the test');
-```
-
-</div>
-
 </section>
 
 ## Solution
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/josephus-problem.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/josephus-problem.english.md
index d0c99cfc1f..fdb4ff568e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/josephus-problem.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/josephus-problem.english.md
@@ -28,19 +28,19 @@ Write a function that takes the initial number of prisoners and 'k' as parameter
 ```yml
 tests:
   - text: <code>josephus</code> should be a function.
-    testString: 'assert(typeof josephus=="function","<code>josephus</code> should be a function.");'
+    testString: assert(typeof josephus=='function','<code>josephus</code> should be a function.');
   - text: <code>josephus(30,3)</code> should return a number.
-    testString: 'assert(typeof josephus(30,3)=="number","<code>josephus(30,3)</code> should return a number.");'
+    testString: assert(typeof josephus(30,3)=='number','<code>josephus(30,3)</code> should return a number.');
   - text: <code>josephus(30,3)</code> should return <code>29</code>.
-    testString: 'assert.equal(josephus(30,3),29,"<code>josephus(30,3)</code> should return <code>29</code>.");'
+    testString: assert.equal(josephus(30,3),29,'<code>josephus(30,3)</code> should return <code>29</code>.');
   - text: <code>josephus(30,5)</code> should return <code>3</code>.
-    testString: 'assert.equal(josephus(30,5),3,"<code>josephus(30,5)</code> should return <code>3</code>.");'
+    testString: assert.equal(josephus(30,5),3,'<code>josephus(30,5)</code> should return <code>3</code>.');
   - text: <code>josephus(20,2)</code> should return <code>9</code>.
-    testString: 'assert.equal(josephus(20,2),9,"<code>josephus(20,2)</code> should return <code>9</code>.");'
+    testString: assert.equal(josephus(20,2),9,'<code>josephus(20,2)</code> should return <code>9</code>.');
   - text: <code>josephus(17,6)</code> should return <code>2</code>.
-    testString: 'assert.equal(josephus(17,6),2,"<code>josephus(17,6)</code> should return <code>2</code>.");'
+    testString: assert.equal(josephus(17,6),2,'<code>josephus(17,6)</code> should return <code>2</code>.');
   - text: <code>josephus(29,4)</code> should return <code>2</code>.
-    testString: 'assert.equal(josephus(29,4),2,"<code>josephus(29,4)</code> should return <code>2</code>.");'
+    testString: assert.equal(josephus(29,4),2,'<code>josephus(29,4)</code> should return <code>2</code>.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/s-expressions.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/s-expressions.english.md
index 385fc9edaf..96ba4b3a2e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/s-expressions.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/s-expressions.english.md
@@ -58,11 +58,11 @@ for examples of native data structures.)
 ```yml
 tests:
   - text: <code>parseSexpr</code> is a function.
-    testString: 'assert(typeof parseSexpr === "function", "<code>parseSexpr</code> is a function.");'
-  - text: '<code>parseSexpr("(data1 data2 data3)")</code> should return ["data1", "data2", "data3"]")'
-    testString: 'assert.deepEqual(parseSexpr(simpleSExpr), simpleSolution, "<code>parseSexpr("(data1 data2 data3)")</code> should return ["data1", "data2", "data3"]");'
+    testString: assert(typeof parseSexpr === 'function', '<code>parseSexpr</code> is a function.');
+  - text: <code>parseSexpr('(data1 data2 data3)')</code> should return ['data1', 'data2', 'data3']")
+    testString: assert.deepEqual(parseSexpr(simpleSExpr), simpleSolution, "<code>parseSexpr('(data1 data2 data3)')</code> should return ['data1', 'data2', 'data3']");
   - text: <code>parseSexpr('(data1 data2 data3)')</code> should return an array with 3 elements")
-    testString: 'assert.deepEqual(parseSexpr(basicSExpr), basicSolution, "<code>parseSexpr("(data1 data2 data3)")</code> should return an array with 3 elements");'
+    testString: assert.deepEqual(parseSexpr(basicSExpr), basicSolution, "<code>parseSexpr('(data1 data2 data3)')</code> should return an array with 3 elements");
 
 ```
 
@@ -87,7 +87,11 @@ function parseSexpr(str) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const simpleSExpr = '(data1 data2 data3)';
+const simpleSolution = ['data1', 'data2', 'data3'];
+
+const basicSExpr = '((data "quoted data" 123 4.5) (data (!@# (4.5) "(more" "data)")))';
+const basicSolution = [["data","\"quoted data\"",123,4.5],["data",["!@#",[4.5],"\"(more\"","\"data)\""]]];
 ```
 
 </div>
@@ -108,7 +112,7 @@ function parseSexpr(str) {
     else if (ti == '(') t[i] = '[', c += 1;
     else if (ti == ')') t[i] = ']', c -= 1;
     else if ((n = +ti) == ti) t[i] = n;
-    else t[i] = `'${ti.replace('\", '\\\")}'`;
+    else t[i] = `'${ti.replace('\'', '\\\'')}'`;
     if (i > 0 && ti != ']' && t[i - 1].trim() != '(') t.splice(i, 0, ',');
     if (!c) if (!o) o = true; else return;
   }
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sailors-coconuts-and-a-monkey-problem.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sailors-coconuts-and-a-monkey-problem.english.md
index 8df6da77fe..fc3245833a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sailors-coconuts-and-a-monkey-problem.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sailors-coconuts-and-a-monkey-problem.english.md
@@ -77,13 +77,13 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>splitCoconuts</code> is a function.
-    testString: 'assert(typeof splitCoconuts === "function", "<code>splitCoconuts</code> is a function.");'
+    testString: assert(typeof splitCoconuts === 'function', '<code>splitCoconuts</code> is a function.');
   - text: <code>splitCoconuts(5)</code> should return 3121.
-    testString: 'assert(splitCoconuts(5) === 3121, "<code>splitCoconuts(5)</code> should return 3121.");'
+    testString: assert(splitCoconuts(5) === 3121, '<code>splitCoconuts(5)</code> should return 3121.');
   - text: <code>splitCoconuts(6)</code> should return 233275.
-    testString: 'assert(splitCoconuts(6) === 233275, "<code>splitCoconuts(6)</code> should return 233275.");'
+    testString: assert(splitCoconuts(6) === 233275, '<code>splitCoconuts(6)</code> should return 233275.');
   - text: <code>splitCoconuts(7)</code> should return 823537.
-    testString: 'assert(splitCoconuts(7) === 823537, "<code>splitCoconuts(7)</code> should return 823537.");'
+    testString: assert(splitCoconuts(7) === 823537, '<code>splitCoconuts(7)</code> should return 823537.');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sedols.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sedols.english.md
index 04b12c8eb9..7922f8cdaa 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sedols.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/sedols.english.md
@@ -51,15 +51,15 @@ challengeType: 5
 ```yml
 tests:
   - text: <code>sedol</code> is a function.
-    testString: 'assert(typeof sedol === "function", "<code>sedol</code> is a function.");'
+    testString: assert(typeof sedol === 'function', '<code>sedol</code> is a function.');
   - text: <code>sedol('a')</code> should return null.")
-    testString: 'assert(sedol("a") === null, "<code>sedol("a")</code> should return null.");'
+    testString: assert(sedol('a') === null, "<code>sedol('a')</code> should return null.");
   - text: <code>sedol('710889')</code> should return '7108899'.")
-    testString: 'assert(sedol("710889") === "7108899", "<code>sedol("710889")</code> should return "7108899".");'
+    testString: assert(sedol('710889') === '7108899', "<code>sedol('710889')</code> should return '7108899'.");
   - text: <code>sedol('BOATER')</code> should return null.")
-    testString: 'assert(sedol("BOATER") === null, "<code>sedol("BOATER")</code> should return null.");'
+    testString: assert(sedol('BOATER') === null, "<code>sedol('BOATER')</code> should return null.");
   - text: <code>sedol('228276')</code> should return '2282765'.")
-    testString: 'assert(sedol("228276") === "2282765", "<code>sedol("228276")</code> should return "2282765".");'
+    testString: assert(sedol('228276') === '2282765', "<code>sedol('228276')</code> should return '2282765'.");
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/taxicab-numbers.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/taxicab-numbers.english.md
index 12d800c2de..2ae1f5014b 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/taxicab-numbers.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/taxicab-numbers.english.md
@@ -37,17 +37,17 @@ See also:
 ```yml
 tests:
   - text: <code>taxicabNumbers </code> is a function.
-    testString: 'assert(typeof taxicabNumbers === "function", "<code>taxicabNumbers </code> is a function.");'
+    testString: assert(typeof taxicabNumbers === 'function', '<code>taxicabNumbers </code> is a function.');
   - text: <code>taxicabNumbers </code> should return an array.
-    testString: 'assert(typeof taxicabNumbers(2) === "object", "<code>taxicabNumbers </code> should return an array.");'
+    testString: assert(typeof taxicabNumbers(2) === 'object', '<code>taxicabNumbers </code> should return an array.');
   - text: <code>taxicabNumbers </code> should return an array of numbers.
-    testString: 'assert(typeof taxicabNumbers(100)[0] === "number", "<code>taxicabNumbers </code> should return an array of numbers.");'
-  - text: '<code>taxicabNumbers(4) </code> must return [1729, 4104, 13832, 20683].'
-    testString: 'assert.deepEqual(taxicabNumbers(4), res4, "<code>taxicabNumbers(4) </code> must return [1729, 4104, 13832, 20683].");'
-  - text: 'taxicabNumbers(25) should return [1729, 4104, 13832, 20683, 32832, 39312, 40033, 46683, 64232, 65728, 110656, 110808, 134379, 149389, 165464, 171288, 195841, 216027, 216125, 262656, 314496, 320264, 327763, 373464, 402597]'
-    testString: 'assert.deepEqual(taxicabNumbers(25), res25, "taxicabNumbers(25) should return [1729, 4104, 13832, 20683, 32832, 39312, 40033, 46683, 64232, 65728, 110656, 110808, 134379, 149389, 165464, 171288, 195841, 216027, 216125, 262656, 314496, 320264, 327763, 373464, 402597]");'
-  - text: 'taxicabNumbers(39) resulting numbers from 20 - 29 should be [314496,320264,327763,373464,402597,439101,443889,513000,513856].'
-    testString: 'assert.deepEqual(taxicabNumbers(39).slice(20, 29), res39From20To29, "taxicabNumbers(39) resulting numbers from 20 - 29 should be [314496,320264,327763,373464,402597,439101,443889,513000,513856].");'
+    testString: assert(typeof taxicabNumbers(100)[0] === 'number', '<code>taxicabNumbers </code> should return an array of numbers.');
+  - text: <code>taxicabNumbers(4) </code> must return [1729, 4104, 13832, 20683].
+    testString: assert.deepEqual(taxicabNumbers(4), res4, '<code>taxicabNumbers(4) </code> must return [1729, 4104, 13832, 20683].');
+  - text: taxicabNumbers(25) should return [1729, 4104, 13832, 20683, 32832, 39312, 40033, 46683, 64232, 65728, 110656, 110808, 134379, 149389, 165464, 171288, 195841, 216027, 216125, 262656, 314496, 320264, 327763, 373464, 402597]
+    testString: assert.deepEqual(taxicabNumbers(25), res25, 'taxicabNumbers(25) should return [1729, 4104, 13832, 20683, 32832, 39312, 40033, 46683, 64232, 65728, 110656, 110808, 134379, 149389, 165464, 171288, 195841, 216027, 216125, 262656, 314496, 320264, 327763, 373464, 402597]');
+  - text: taxicabNumbers(39) resulting numbers from 20 - 29 should be [314496,320264,327763,373464,402597,439101,443889,513000,513856].
+    testString: assert.deepEqual(taxicabNumbers(39).slice(20, 29), res39From20To29, 'taxicabNumbers(39) resulting numbers from 20 - 29 should be [314496,320264,327763,373464,402597,439101,443889,513000,513856].');
 
 ```
 
@@ -72,7 +72,14 @@ function taxicabNumbers (n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const res4 = [1729, 4104, 13832, 20683];
+const res25 = [
+  1729, 4104, 13832, 20683, 32832, 39312, 40033, 46683, 64232, 65728, 110656,
+  110808, 134379, 149389, 165464, 171288, 195841, 216027, 216125, 262656, 314496, 320264, 327763,
+  373464, 402597
+];
+
+const res39From20To29 = [314496, 320264, 327763, 373464, 402597, 439101, 443889, 513000, 513856];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/tokenize-a-string-with-escaping.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/tokenize-a-string-with-escaping.english.md
index df633f16d5..4c6b86df76 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/tokenize-a-string-with-escaping.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/tokenize-a-string-with-escaping.english.md
@@ -29,7 +29,7 @@ It should accept three input parameters:
   function should output the following array:
 </p>
   <pre>
-  ['one|uno', ", 'three^^', 'four^|quatro', "]
+  ['one|uno', '', 'three^^', 'four^|quatro', '']
   </pre>
 </section>
 
@@ -44,13 +44,13 @@ It should accept three input parameters:
 ```yml
 tests:
   - text: <code>tokenize</code> is a function.
-    testString: 'assert(typeof tokenize === "function", "<code>tokenize</code> is a function.");'
+    testString: assert(typeof tokenize === 'function', '<code>tokenize</code> is a function.');
   - text: <code>tokenize</code> should return an array.
-    testString: 'assert(typeof tokenize("a", "b", "c") === "object", "<code>tokenize</code> should return an array.");'
-  - text: '<code>tokenize("one^|uno||three^^^^|four^^^|^cuatro|", "|", "^") </code> should return ["one|uno", "", "three^^", "four^|cuatro", ""]")'
-    testString: 'assert.deepEqual(tokenize(testStr1, "|", "^"), res1, "<code>tokenize("one^|uno||three^^^^|four^^^|^cuatro|", "|", "^") </code> should return ["one|uno", "", "three^^", "four^|cuatro", ""]");'
-  - text: '<code>tokenize("a@&bcd&ef&&@@hi", "&", "@")</code> should return <code>["a&bcd", "ef", "", "@hi"]</code>'
-    testString: 'assert.deepEqual(tokenize(testStr2, "&", "@"), res2, "<code>tokenize("a@&bcd&ef&&@@hi", "&", "@")</code> should return <code>["a&bcd", "ef", "", "@hi"]</code>");'
+    testString: assert(typeof tokenize('a', 'b', 'c') === 'object', '<code>tokenize</code> should return an array.');
+  - text: <code>tokenize('one^|uno||three^^^^|four^^^|^cuatro|', '|', '^') </code> should return ['one|uno', '', 'three^^', 'four^|cuatro', '']")
+    testString: assert.deepEqual(tokenize(testStr1, '|', '^'), res1, "<code>tokenize('one^|uno||three^^^^|four^^^|^cuatro|', '|', '^') </code> should return ['one|uno', '', 'three^^', 'four^|cuatro', '']");
+  - text: <code>tokenize('a@&bcd&ef&&@@hi', '&', '@')</code> should return <code>['a&bcd', 'ef', '', '@hi']</code>
+    testString: assert.deepEqual(tokenize(testStr2, '&', '@'), res2, '<code>tokenize("a@&bcd&ef&&@@hi", "&", "@")</code> should return <code>["a&bcd", "ef", "", "@hi"]</code>');
 
 ```
 
@@ -74,7 +74,12 @@ function tokenize(str, esc, sep) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testStr1 = 'one^|uno||three^^^^|four^^^|^cuatro|';
+const res1 = ['one|uno', '', 'three^^', 'four^|cuatro', ''];
+
+// TODO add more tests
+const testStr2 = 'a@&bcd&ef&&@@hi';
+const res2 = ['a&bcd', 'ef', '', '@hi'];
 ```
 
 </div>
@@ -96,14 +101,14 @@ function tokenize(str, charDelim, charEsc) {
 
       return {
         esc: blnEscChar,
-        token: blnBreak ? " : (
-          a.token + (blnEscChar ? " : x)
+        token: blnBreak ? '' : (
+          a.token + (blnEscChar ? '' : x)
         ),
         list: a.list.concat(blnBreak ? a.token : [])
       };
     }, {
       esc: false,
-      token: ",
+      token: '',
       list: []
     });
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/top-rank-per-group.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/top-rank-per-group.english.md
index caf8ebb0b4..e222370937 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/top-rank-per-group.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/top-rank-per-group.english.md
@@ -53,19 +53,19 @@ one could rank the top-rated movie in each genre by calling
 ```yml
 tests:
   - text: <code>topRankPerGroup</code> is a function.
-    testString: 'assert(typeof topRankPerGroup === "function", "<code>topRankPerGroup</code> is a function.");'
+    testString: assert(typeof topRankPerGroup === 'function', '<code>topRankPerGroup</code> is a function.');
   - text: <code>topRankPerGroup</code> returns undefined on negative n values.
-    testString: 'assert(typeof topRankPerGroup(-1, []) === "undefined", "<code>topRankPerGroup</code> returns undefined on negative n values.");'
+    testString: assert(typeof topRankPerGroup(-1, []) === 'undefined', '<code>topRankPerGroup</code> returns undefined on negative n values.');
   - text: First department must be D050
-    testString: 'assert.equal(res1[0][0].dept, "D050", "First department must be D050");'
+    testString: assert.equal(res1[0][0].dept, 'D050', 'First department must be D050');
   - text: First department must be D050
-    testString: 'assert.equal(res1[0][1].salary, 21900, "First department must be D050");'
+    testString: assert.equal(res1[0][1].salary, 21900, 'First department must be D050');
   - text: The last department must be D202
-    testString: 'assert.equal(res1[3][3].dept, "D202", "The last department must be D202");'
-  - text: '<code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.'
-    testString: 'assert.equal(res2[2].length, 1, "<code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.");'
-  - text: '<code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.'
-    testString: 'assert.equal(res3[2][1].name, "Maze Runner", "<code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.");'
+    testString: assert.equal(res1[3][3].dept, 'D202', 'The last department must be D202');
+  - text: <code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.
+    testString: assert.equal(res2[2].length, 1, '<code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.');
+  - text: <code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.
+    testString: assert.equal(res3[2][1].name, 'Maze Runner', '<code>topRankPerGroup(1, ...)</code> must return only top ranking result per group.');
 
 ```
 
@@ -90,7 +90,36 @@ function topRankPerGroup(n, data, groupName, rankName) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const testData1 = [
+  { name: 'Tyler Bennett', id: 'E10297', salary: 32000, dept: 'D101' },
+  { name: 'John Rappl', id: 'E21437', salary: 47000, dept: 'D050' },
+  { name: 'George Woltman', id: 'E00127', salary: 53500, dept: 'D101' },
+  { name: 'Adam Smith', id: 'E63535', salary: 18000, dept: 'D202' },
+  { name: 'Claire Buckman', id: 'E39876', salary: 27800, dept: 'D202' },
+  { name: 'David McClellan', id: 'E04242', salary: 41500, dept: 'D101' },
+  { name: 'Rich Holcomb', id: 'E01234', salary: 49500, dept: 'D202' },
+  { name: 'Nathan Adams', id: 'E41298', salary: 21900, dept: 'D050' },
+  { name: 'Richard Potter', id: 'E43128', salary: 15900, dept: 'D101' },
+  { name: 'David Motsinger', id: 'E27002', salary: 19250, dept: 'D202' },
+  { name: 'Tim Sampair', id: 'E03033', salary: 27000, dept: 'D101' },
+  { name: 'Kim Arlich', id: 'E10001', salary: 57000, dept: 'D190' },
+  { name: 'Timothy Grove', id: 'E16398', salary: 29900, dept: 'D190' }
+];
+
+const res1 = topRankPerGroup(10, testData1, 'dept', 'salary');
+
+const testData2 = [
+  { name: 'Friday 13th', genre: 'horror', rating: 9.9 },
+  { name: "Nightmare on Elm's Street", genre: 'horror', rating: 5.7 },
+  { name: 'Titanic', genre: 'drama', rating: 7.3 },
+  { name: 'Maze Runner', genre: 'scifi', rating: 7.1 },
+  { name: 'Blade runner', genre: 'scifi', rating: 8.9 }
+];
+
+const res2 = topRankPerGroup(1, testData2, 'genre', 'rating');
+const res3 = topRankPerGroup(2, testData2, 'genre', 'rating');
+
+//console.log(JSON.stringify(topRankPerGroup(10, testData1)));
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/topological-sort.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/topological-sort.english.md
index 3b46325bb1..f98b5814f8 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/topological-sort.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/topological-sort.english.md
@@ -73,15 +73,15 @@ C.f.:
 ```yml
 tests:
   - text: <code>topologicalSort</code> is a function.
-    testString: 'assert(typeof topologicalSort === "function", "<code>topologicalSort</code> is a function.");'
+    testString: assert(typeof topologicalSort === 'function', '<code>topologicalSort</code> is a function.');
   - text: <code>topologicalSort</code> must return correct library order..
-    testString: 'assert.deepEqual(topologicalSort(libsSimple), ["bbb", "aaa"], "<code>topologicalSort</code> must return correct library order..");'
+    testString: assert.deepEqual(topologicalSort(libsSimple), ['bbb', 'aaa'], '<code>topologicalSort</code> must return correct library order..');
   - text: <code>topologicalSort</code> must return correct library order..
-    testString: 'assert.deepEqual(topologicalSort(libsVHDL), solutionVHDL, "<code>topologicalSort</code> must return correct library order..");'
+    testString: assert.deepEqual(topologicalSort(libsVHDL), solutionVHDL, '<code>topologicalSort</code> must return correct library order..');
   - text: <code>topologicalSort</code> must return correct library order..
-    testString: 'assert.deepEqual(topologicalSort(libsCustom), solutionCustom, "<code>topologicalSort</code> must return correct library order..");'
+    testString: assert.deepEqual(topologicalSort(libsCustom), solutionCustom, '<code>topologicalSort</code> must return correct library order..');
   - text: <code>topologicalSort</code> must ignore unorderable dependencies..
-    testString: 'assert.deepEqual(topologicalSort(libsUnorderable), solutionUnorderable, "<code>topologicalSort</code> must ignore unorderable dependencies..");'
+    testString: assert.deepEqual(topologicalSort(libsUnorderable), solutionUnorderable, '<code>topologicalSort</code> must ignore unorderable dependencies..');
 
 ```
 
@@ -106,7 +106,45 @@ function topologicalSort(libs) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const libsSimple =
+  `aaa bbb
+  bbb`;
+
+const libsVHDL =
+  `des_system_lib   std synopsys std_cell_lib des_system_lib dw02 dw01 ramlib ieee
+  dw01             ieee dw01 dware gtech
+  dw02             ieee dw02 dware
+  dw03             std synopsys dware dw03 dw02 dw01 ieee gtech
+  dw04             dw04 ieee dw01 dware gtech
+  dw05             dw05 ieee dware
+  dw06             dw06 ieee dware
+  dw07             ieee dware
+  dware            ieee dware
+  gtech            ieee gtech
+  ramlib           std ieee
+  std_cell_lib     ieee std_cell_lib
+  synopsys`;
+
+const solutionVHDL = [
+  'ieee', 'std_cell_lib', 'gtech', 'dware', 'dw07', 'dw06',
+  'dw05', 'dw02', 'dw01', 'dw04', 'std', 'ramlib', 'synopsys',
+  'dw03', 'des_system_lib'
+];
+
+const libsCustom =
+  `a b c d
+  b c d
+  d c
+  c base
+  base`;
+const solutionCustom = ['base', 'c', 'd', 'b', 'a'];
+
+const libsUnorderable =
+  `TestLib Base MainLib
+  MainLib TestLib
+  Base`;
+
+const solutionUnorderable = ['Base'];
 ```
 
 </div>
@@ -123,7 +161,7 @@ function topologicalSort(libs) {
   // and array of packages on which it depends.
   const D = libs
     .split('\n')
-    .map(e => e.split(' ').filter(ep => ep !== "))
+    .map(e => e.split(' ').filter(ep => ep !== ''))
     .reduce((p, c) =>
       p.set(c[0], c.filter((e, i) => (i > 0 && e !== c[0] ? e : null))), new Map());
   [].concat(...D.values()).forEach(e => {
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/towers-of-hanoi.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/towers-of-hanoi.english.md
index acc22be7c8..86eafb0bb2 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/towers-of-hanoi.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/towers-of-hanoi.english.md
@@ -30,15 +30,15 @@ disc from stack B to A.
 ```yml
 tests:
   - text: <code>towerOfHanoi</code> is a function.
-    testString: 'assert(typeof towerOfHanoi === "function", "<code>towerOfHanoi</code> is a function.");'
-  - text: '<code>towerOfHanoi(3, ...)</code> should return 7 moves.'
-    testString: 'assert(res3.length === 7, "<code>towerOfHanoi(3, ...)</code> should return 7 moves.");'
-  - text: '<code>towerOfHanoi(3, "A", "B", "C")</code> should return [["A","B"],["A","C"],["B","C"],["A","B"],["C","A"],["C","B"],["A","B"]].")'
-    testString: 'assert.deepEqual(towerOfHanoi(3, "A", "B", "C"), res3Moves, "<code>towerOfHanoi(3, "A", "B", "C")</code> should return [["A","B"],["A","C"],["B","C"],["A","B"],["C","A"],["C","B"],["A","B"]].");'
-  - text: '<code>towerOfHanoi(5, "X", "Y", "Z")</code> 10th move should be Y -> X.'
-    testString: 'assert.deepEqual(res5[9], ["Y", "X"], "<code>towerOfHanoi(5, "X", "Y", "Z")</code> 10th move should be Y -> X.");'
-  - text: '<code>towerOfHanoi(7, "A", "B", "C")</code> first ten moves are [["A","B"],["A","C"],["B","C"],["A","B"],["C","A"],["C","B"],["A","B"],["A","C"],["B","C"],["B","A"]].")'
-    testString: 'assert.deepEqual(towerOfHanoi(7, "A", "B", "C").slice(0, 10), res7First10Moves, "<code>towerOfHanoi(7, "A", "B", "C")</code> first ten moves are [["A","B"],["A","C"],["B","C"],["A","B"],["C","A"],["C","B"],["A","B"],["A","C"],["B","C"],["B","A"]].");'
+    testString: assert(typeof towerOfHanoi === 'function', '<code>towerOfHanoi</code> is a function.');
+  - text: <code>towerOfHanoi(3, ...)</code> should return 7 moves.
+    testString: assert(res3.length === 7, '<code>towerOfHanoi(3, ...)</code> should return 7 moves.');
+  - text: <code>towerOfHanoi(3, 'A', 'B', 'C')</code> should return [['A','B'],['A','C'],['B','C'],['A','B'],['C','A'],['C','B'],['A','B']].")
+    testString: assert.deepEqual(towerOfHanoi(3, 'A', 'B', 'C'), res3Moves, "<code>towerOfHanoi(3, 'A', 'B', 'C')</code> should return [['A','B'],['A','C'],['B','C'],['A','B'],['C','A'],['C','B'],['A','B']].");
+  - text: <code>towerOfHanoi(5, "X", "Y", "Z")</code> 10th move should be Y -> X.
+    testString: assert.deepEqual(res5[9], ['Y', 'X'], '<code>towerOfHanoi(5, "X", "Y", "Z")</code> 10th move should be Y -> X.');
+  - text: <code>towerOfHanoi(7, 'A', 'B', 'C')</code> first ten moves are [['A','B'],['A','C'],['B','C'],['A','B'],['C','A'],['C','B'],['A','B'],['A','C'],['B','C'],['B','A']].")
+    testString: assert.deepEqual(towerOfHanoi(7, 'A', 'B', 'C').slice(0, 10), res7First10Moves, "<code>towerOfHanoi(7, 'A', 'B', 'C')</code> first ten moves are [['A','B'],['A','C'],['B','C'],['A','B'],['C','A'],['C','B'],['A','B'],['A','C'],['B','C'],['B','A']].");
 
 ```
 
@@ -63,7 +63,10 @@ function towerOfHanoi (n, a, b, c) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const res3 = towerOfHanoi(3, 'A', 'B', 'C');
+const res3Moves = [['A', 'B'], ['A', 'C'], ['B', 'C'], ['A', 'B'], ['C', 'A'], ['C', 'B'], ['A', 'B']];
+const res5 = towerOfHanoi(5, 'X', 'Y', 'Z');
+const res7First10Moves = [['A', 'B'], ['A', 'C'], ['B', 'C'], ['A', 'B'], ['C', 'A'], ['C', 'B'], ['A', 'B'], ['A', 'C'], ['B', 'C'], ['B', 'A']];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-cross-product.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-cross-product.english.md
index 865f5849ca..cca0c897ad 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-cross-product.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-cross-product.english.md
@@ -28,11 +28,11 @@ invalid inputs (ie vectors of different lengths).
 ```yml
 tests:
   - text: dotProduct must be a function
-    testString: 'assert.equal(typeof crossProduct, "function", "dotProduct must be a function");'
+    testString: assert.equal(typeof crossProduct, 'function', 'dotProduct must be a function');
   - text: dotProduct() must return null
-    testString: 'assert.equal(crossProduct(), null, "dotProduct() must return null");'
-  - text: 'crossProduct([1, 2, 3], [4, 5, 6]) must return [-3, 6, -3].'
-    testString: 'assert.deepEqual(res12, exp12, "crossProduct([1, 2, 3], [4, 5, 6]) must return [-3, 6, -3].");'
+    testString: assert.equal(crossProduct(), null, 'dotProduct() must return null');
+  - text: crossProduct([1, 2, 3], [4, 5, 6]) must return [-3, 6, -3].
+    testString: assert.deepEqual(res12, exp12, 'crossProduct([1, 2, 3], [4, 5, 6]) must return [-3, 6, -3].');
 
 ```
 
@@ -56,7 +56,10 @@ function crossProduct() {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const tv1 = [1, 2, 3];
+const tv2 = [4, 5, 6];
+const res12 = crossProduct(tv1, tv2);
+const exp12 = [-3, 6, -3];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-dot-product.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-dot-product.english.md
index f0c04639c5..fa6782a9b4 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-dot-product.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/vector-dot-product.english.md
@@ -30,17 +30,17 @@ invalid inputs (ie vectors of different lengths).
 ```yml
 tests:
   - text: dotProduct must be a function
-    testString: 'assert.equal(typeof dotProduct, "function", "dotProduct must be a function");'
+    testString: assert.equal(typeof dotProduct, 'function', 'dotProduct must be a function');
   - text: dotProduct() must return null
-    testString: 'assert.equal(dotProduct(), null, "dotProduct() must return null");'
-  - text: 'dotProduct([[1], [1]]) must return 1.'
-    testString: 'assert.equal(dotProduct([1], [1]), 1, "dotProduct([[1], [1]]) must return 1.");'
-  - text: 'dotProduct([[1], [1, 2]]) must return null.'
-    testString: 'assert.equal(dotProduct([1], [1, 2]), null, "dotProduct([[1], [1, 2]]) must return null.");'
-  - text: 'dotProduct([1, 3, -5], [4, -2, -1]) must return 3.'
-    testString: 'assert.equal(dotProduct([1, 3, -5], [4, -2, -1]), 3, "dotProduct([1, 3, -5], [4, -2, -1]) must return 3.");'
+    testString: assert.equal(dotProduct(), null, 'dotProduct() must return null');
+  - text: dotProduct([[1], [1]]) must return 1.
+    testString: assert.equal(dotProduct([1], [1]), 1, 'dotProduct([[1], [1]]) must return 1.');
+  - text: dotProduct([[1], [1, 2]]) must return null.
+    testString: assert.equal(dotProduct([1], [1, 2]), null, 'dotProduct([[1], [1, 2]]) must return null.');
+  - text: dotProduct([1, 3, -5], [4, -2, -1]) must return 3.
+    testString: assert.equal(dotProduct([1, 3, -5], [4, -2, -1]), 3, 'dotProduct([1, 3, -5], [4, -2, -1]) must return 3.');
   - text: <code>dotProduct(...nVectors)</code> should return 156000
-    testString: 'assert.equal(dotProduct([ 0, 1, 2, 3, 4 ], [ 0, 2, 4, 6, 8 ], [ 0, 3, 6, 9, 12 ], [ 0, 4, 8, 12, 16 ], [ 0, 5, 10, 15, 20 ]), 156000, "<code>dotProduct(...nVectors)</code> should return 156000");'
+    testString: assert.equal(dotProduct([ 0, 1, 2, 3, 4 ], [ 0, 2, 4, 6, 8 ], [ 0, 3, 6, 9, 12 ], [ 0, 4, 8, 12, 16 ], [ 0, 5, 10, 15, 20 ]), 156000, '<code>dotProduct(...nVectors)</code> should return 156000');
 
 ```
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/word-wrap.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/word-wrap.english.md
index 3ca16ac304..0632459a36 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/word-wrap.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/word-wrap.english.md
@@ -15,7 +15,7 @@ Example text:
 <pre>
 Wrap text using a more sophisticated algorithm such as the Knuth and Plass TeX algorithm.
 If your language provides this, you get easy extra credit,
-but you "must reference documentation" indicating that the algorithm
+but you ''must reference documentation'' indicating that the algorithm
 is something better than a simple minimimum length algorithm.
 </pre>
 <p>
@@ -44,17 +44,17 @@ than a simple minimimum length algorithm.
 ```yml
 tests:
   - text: wrap must be a function.
-    testString: 'assert.equal(typeof wrap, "function", "wrap must be a function.");'
+    testString: assert.equal(typeof wrap, 'function', 'wrap must be a function.');
   - text: wrap must return a string.
-    testString: 'assert.equal(typeof wrap("abc", 10), "string", "wrap must return a string.");'
+    testString: assert.equal(typeof wrap('abc', 10), 'string', 'wrap must return a string.');
   - text: wrap(80) must return 4 lines.
-    testString: 'assert(wrapped80.split("\n").length === 4, "wrap(80) must return 4 lines.");'
+    testString: assert(wrapped80.split('\n').length === 4, 'wrap(80) must return 4 lines.');
   - text: Your <code>wrap</code> function should return our expected text
-    testString: 'assert.equal(wrapped80.split("\n")[0], firstRow80, "Your <code>wrap</code> function should return our expected text");'
+    testString: assert.equal(wrapped80.split('\n')[0], firstRow80, 'Your <code>wrap</code> function should return our expected text');
   - text: wrap(42) must return 7 lines.
-    testString: 'assert(wrapped42.split("\n").length === 7, "wrap(42) must return 7 lines.");'
+    testString: assert(wrapped42.split('\n').length === 7, 'wrap(42) must return 7 lines.');
   - text: Your <code>wrap</code> function should return our expected text
-    testString: 'assert.equal(wrapped42.split("\n")[0], firstRow42, "Your <code>wrap</code> function should return our expected text");'
+    testString: assert.equal(wrapped42.split('\n')[0], firstRow42, 'Your <code>wrap</code> function should return our expected text');
 
 ```
 
@@ -78,7 +78,19 @@ function wrap (text, limit) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const text =
+`Wrap text using a more sophisticated algorithm such as the Knuth and Plass TeX algorithm.
+If your language provides this, you get easy extra credit,
+but you ''must reference documentation'' indicating that the algorithm
+is something better than a simple minimimum length algorithm.`;
+
+const wrapped80 = wrap(text, 80);
+const wrapped42 = wrap(text, 42);
+
+const firstRow80 =
+    'Wrap text using a more sophisticated algorithm such as the Knuth and Plass TeX';
+
+const firstRow42 = 'Wrap text using a more sophisticated';
 ```
 
 </div>
@@ -91,7 +103,7 @@ console.info('after the test');
 
 ```js
 function wrap (text, limit) {
-  const noNewlines = text.replace('\n', ");
+  const noNewlines = text.replace('\n', '');
   if (noNewlines.length > limit) {
     // find the last space within limit
     const edge = noNewlines.slice(0, limit).lastIndexOf(' ');
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/y-combinator.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/y-combinator.english.md
index 8d75790914..8872e2c54e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/y-combinator.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/y-combinator.english.md
@@ -39,17 +39,17 @@ See also <a href="http://vimeo.com/45140590">Jim Weirich: Adventures in Function
 ```yml
 tests:
   - text: Y must return a function
-    testString: 'assert.equal(typeof Y(f => n => n), "function", "Y must return a function");'
+    testString: assert.equal(typeof Y(f => n => n), 'function', 'Y must return a function');
   - text: factorial(1) must return 1.
-    testString: 'assert.equal(factorial(1), 1, "factorial(1) must return 1.");'
+    testString: assert.equal(factorial(1), 1, 'factorial(1) must return 1.');
   - text: factorial(2) must return 2.
-    testString: 'assert.equal(factorial(2), 2, "factorial(2) must return 2.");'
+    testString: assert.equal(factorial(2), 2, 'factorial(2) must return 2.');
   - text: factorial(3) must return 6.
-    testString: 'assert.equal(factorial(3), 6, "factorial(3) must return 6.");'
+    testString: assert.equal(factorial(3), 6, 'factorial(3) must return 6.');
   - text: factorial(4) must return 24.
-    testString: 'assert.equal(factorial(4), 24, "factorial(4) must return 24.");'
+    testString: assert.equal(factorial(4), 24, 'factorial(4) must return 24.');
   - text: factorial(10) must return 3628800.
-    testString: 'assert.equal(factorial(10), 3628800, "factorial(10) must return 3628800.");'
+    testString: assert.equal(factorial(10), 3628800, 'factorial(10) must return 3628800.');
 
 ```
 
@@ -81,7 +81,7 @@ var factorial = Y(function(f) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+var factorial = Y(f => n => (n > 1 ? n * f(n - 1) : 1));
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zeckendorf-number-representation.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zeckendorf-number-representation.english.md
index bbd3c6b3b1..1c309a80d9 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zeckendorf-number-representation.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zeckendorf-number-representation.english.md
@@ -24,7 +24,7 @@ dropped so that 11 decimal becomes <code>10100</code>.
 10100 is not the only way to make 11 from the Fibonacci numbers however
 <code>0*13 + 1*8 + 0*5 + 0*3 + 1*2 + 1*1</code> or 010011 would also
 represent decimal 11. For a true Zeckendorf number there is the added
-restriction that "no two consecutive Fibonacci numbers can be used"
+restriction that ''no two consecutive Fibonacci numbers can be used''
 which leads to the former unique solution.
 </p>
 <p>
@@ -44,9 +44,9 @@ which leads to the former unique solution.
 ```yml
 tests:
   - text: zeckendorf must be function
-    testString: 'assert.equal(typeof zeckendorf, "function", "zeckendorf must be function");'
+    testString: assert.equal(typeof zeckendorf, 'function', 'zeckendorf must be function');
   - text: Your <code>zeckendorf</code> function should return the correct answer
-    testString: 'assert.deepEqual(answer, solution20, "Your <code>zeckendorf</code> function should return the correct answer");'
+    testString: assert.deepEqual(answer, solution20, 'Your <code>zeckendorf</code> function should return the correct answer');
 
 ```
 
@@ -70,7 +70,19 @@ function zeckendorf(n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const range = (m, n) => (
+  Array.from({
+    length: Math.floor(n - m) + 1
+  }, (_, i) => m + i)
+);
+
+const solution20 = [
+  '1', '10', '100', '101', '1000', '1001', '1010', '10000', '10001',
+  '10010', '10100', '10101', '100000', '100001', '100010', '100100', '100101',
+  '101000', '101001', '101010'
+];
+
+const answer = range(1, 20).map(zeckendorf);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zhang-suen-thinning-algorithm.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zhang-suen-thinning-algorithm.english.md
index 8726f012e0..66bc223c2f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zhang-suen-thinning-algorithm.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zhang-suen-thinning-algorithm.english.md
@@ -73,8 +73,8 @@ All pixels are again tested and pixels satisfying all the following conditions a
   (0) The pixel is black and has eight neighbours
   (1) $2 <= B(P1) <= 6$
   (2) $A(P1) = 1$
-  (3) At least one of P2 and P4 and "'P8"' is white
-  (4) At least one of "'P2"' and P6 and P8 is white
+  (3) At least one of P2 and P4 and '''P8''' is white
+  (4) At least one of '''P2''' and P6 and P8 is white
 After iterating over the image and collecting all the pixels satisfying all step 2 conditions, all these condition satisfying pixels are again set to white.
 Iteration:
 If any pixels were set in this round of either step 1 or step 2 then all steps are repeated until no image pixels are so changed.
@@ -95,13 +95,13 @@ Write a routine to perform Zhang-Suen thinning on an image matrix of ones and ze
 ```yml
 tests:
   - text: <code>thinImage</code> must be a function
-    testString: 'assert.equal(typeof thinImage, "function", "<code>thinImage</code> must be a function");'
+    testString: assert.equal(typeof thinImage, 'function', '<code>thinImage</code> must be a function');
   - text: <code>thinImage</code> must return an array
-    testString: 'assert(Array.isArray(result), "<code>thinImage</code> must return an array");'
+    testString: assert(Array.isArray(result), '<code>thinImage</code> must return an array');
   - text: <code>thinImage</code> must return an array of strings
-    testString: 'assert.equal(typeof result[0], "string", "<code>thinImage</code> must return an array of strings");'
+    testString: assert.equal(typeof result[0], 'string', '<code>thinImage</code> must return an array of strings');
   - text: <code>thinImage</code> must return an array of strings
-    testString: 'assert.deepEqual(result, expected, "<code>thinImage</code> must return an array of strings");'
+    testString: assert.deepEqual(result, expected, '<code>thinImage</code> must return an array of strings');
 
 ```
 
@@ -145,7 +145,46 @@ function thinImage(image) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const imageForTests = [
+  '                                                          ',
+  ' #################                   #############        ',
+  ' ##################               ################        ',
+  ' ###################            ##################        ',
+  ' ########     #######          ###################        ',
+  '   ######     #######         #######       ######        ',
+  '   ######     #######        #######                      ',
+  '   #################         #######                      ',
+  '   ################          #######                      ',
+  '   #################         #######                      ',
+  '   ######     #######        #######                      ',
+  '   ######     #######        #######                      ',
+  '   ######     #######         #######       ######        ',
+  ' ########     #######          ###################        ',
+  ' ########     ####### ######    ################## ###### ',
+  ' ########     ####### ######      ################ ###### ',
+  ' ########     ####### ######         ############# ###### ',
+  '                                                          '];
+const expected = [
+  '                                                          ',
+  '                                                          ',
+  '    # ##########                       #######            ',
+  '     ##        #                   ####       #           ',
+  '     #          #                 ##                      ',
+  '     #          #                #                        ',
+  '     #          #                #                        ',
+  '     #          #                #                        ',
+  '     ############               #                         ',
+  '     #          #               #                         ',
+  '     #          #                #                        ',
+  '     #          #                #                        ',
+  '     #          #                #                        ',
+  '     #                            ##                      ',
+  '     #                             ############           ',
+  '                       ###                          ###   ',
+  '                                                          ',
+  '                                                          '
+];
+const result = thinImage(imageForTests);
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zig-zag-matrix.english.md b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zig-zag-matrix.english.md
index 17baf40a38..55f5498142 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zig-zag-matrix.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/zig-zag-matrix.english.md
@@ -6,11 +6,11 @@ challengeType: 5
 
 ## Description
 <section id='description'>
-A &nbsp; "zig-zag" &nbsp; array is a square arrangement of the first &nbsp;
+A &nbsp; ''zig-zag'' &nbsp; array is a square arrangement of the first &nbsp;
 $N^2$ &nbsp; integers, &nbsp; where the
 numbers increase sequentially as you zig-zag along the array's &nbsp;
 <a href="https://en.wiktionary.org/wiki/antidiagonal">anti-diagonals</a>.
-For example, given &nbsp; "'5"', &nbsp; produce this array:
+For example, given &nbsp; '''5''', &nbsp; produce this array:
 <pre>
  0  1  5  6 14
  2  4  7 13 15
@@ -33,17 +33,17 @@ corresponding matrix as two-dimensional array.
 ```yml
 tests:
   - text: ZigZagMatrix must be a function
-    testString: 'assert.equal(typeof ZigZagMatrix, "function", "ZigZagMatrix must be a function");'
+    testString: assert.equal(typeof ZigZagMatrix, 'function', 'ZigZagMatrix must be a function');
   - text: ZigZagMatrix should return array
-    testString: 'assert.equal(typeof ZigZagMatrix(1), "object", "ZigZagMatrix should return array");'
+    testString: assert.equal(typeof ZigZagMatrix(1), 'object', 'ZigZagMatrix should return array');
   - text: ZigZagMatrix should return an array of nestes arrays
-    testString: 'assert.equal(typeof ZigZagMatrix(1)[0], "object", "ZigZagMatrix should return an array of nestes arrays");'
-  - text: 'ZigZagMatrix(1) should return [[0]]'
-    testString: 'assert.deepEqual(ZigZagMatrix(1), zm1, "ZigZagMatrix(1) should return [[0]]");'
-  - text: 'ZigZagMatrix(2) should return [[0, 1], [2, 3]]'
-    testString: 'assert.deepEqual(ZigZagMatrix(2), zm2, "ZigZagMatrix(2) should return [[0, 1], [2, 3]]");'
+    testString: assert.equal(typeof ZigZagMatrix(1)[0], 'object', 'ZigZagMatrix should return an array of nestes arrays');
+  - text: ZigZagMatrix(1) should return [[0]]
+    testString: assert.deepEqual(ZigZagMatrix(1), zm1, 'ZigZagMatrix(1) should return [[0]]');
+  - text: ZigZagMatrix(2) should return [[0, 1], [2, 3]]
+    testString: assert.deepEqual(ZigZagMatrix(2), zm2, 'ZigZagMatrix(2) should return [[0, 1], [2, 3]]');
   - text: ZigZagMatrix(5) must return specified matrix
-    testString: 'assert.deepEqual(ZigZagMatrix(5), zm5, "ZigZagMatrix(5) must return specified matrix");'
+    testString: assert.deepEqual(ZigZagMatrix(5), zm5, 'ZigZagMatrix(5) must return specified matrix');
 
 ```
 
@@ -68,7 +68,15 @@ function ZigZagMatrix(n) {
 <div id='js-teardown'>
 
 ```js
-console.info('after the test');
+const zm1 = [[0]];
+const zm2 = [[0, 1], [2, 3]];
+const zm5 = [
+  [0, 1, 5, 6, 14],
+  [2, 4, 7, 13, 15],
+  [3, 8, 12, 16, 21],
+  [9, 11, 17, 20, 22],
+  [10, 18, 19, 23, 24]
+];
 ```
 
 </div>
diff --git a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.english.md b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.english.md
index fb25101995..0dfad56d6a 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.english.md
@@ -15,7 +15,7 @@ Fulfill the below <a href='https://en.wikipedia.org/wiki/User_story' target='_bl
 <strong>Hint:</strong> To get the top 100 campers for the last 30 days: <a href='https://fcctop100.herokuapp.com/api/fccusers/top/recent' target='_blank'>https://fcctop100.herokuapp.com/api/fccusers/top/recent</a>.
 <strong>Hint:</strong> To get the top 100 campers of all time: <a href='https://fcctop100.herokuapp.com/api/fccusers/top/alltime' target='_blank'>https://fcctop100.herokuapp.com/api/fccusers/top/alltime</a>.
 Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck.
-When you are finished, click the "I've completed this challenge" button and include a link to your CodePen. 
+When you are finished, click the "I've completed this challenge" button and include a link to your CodePen.
 You can get feedback on your project by sharing it with your friends on Facebook.
 </section>
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.english.md b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.english.md
index 5327d52569..5c320ee08e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.english.md
@@ -19,7 +19,7 @@ Fulfill the below <a href='https://en.wikipedia.org/wiki/User_story' target='_bl
 <strong>User Story:</strong> When I find and beat the boss, I win.
 <strong>User Story:</strong> The game should be challenging, but theoretically winnable.
 Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck.
-When you are finished, click the "I've completed this challenge" button and include a link to your CodePen. 
+When you are finished, click the "I've completed this challenge" button and include a link to your CodePen.
 You can get feedback on your project by sharing it with your friends on Facebook.
 </section>
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-the-game-of-life.english.md b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-the-game-of-life.english.md
index 87f9ed9584..8825b55b05 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-the-game-of-life.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/build-the-game-of-life.english.md
@@ -18,7 +18,7 @@ Fulfill the below <a href='https://en.wikipedia.org/wiki/User_story' target='_bl
 <strong>Hint:</strong> Here's an explanation of Conway's Game of Life from John Conway himself: <a href='https://www.youtube.com/watch?v=E8kUJL04ELA' target='_blank'>https://www.youtube.com/watch?v=E8kUJL04ELA</a>
 <strong>Hint:</strong> Here's an overview of Conway's Game of Life with rules for your reference: <a href='https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life' target='_blank'>https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life</a>
 Remember to use <a href='//github.com/FreeCodeCamp/freecodecamp/wiki/FreeCodeCamp-Get-Help' target='_blank'>Read-Search-Ask</a> if you get stuck.
-When you are finished, click the "I've completed this challenge" button and include a link to your CodePen. 
+When you are finished, click the "I've completed this challenge" button and include a link to your CodePen.
 You can get feedback on your project by sharing it with your friends on Facebook.
 </section>
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/map-data-across-the-globe.english.md b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/map-data-across-the-globe.english.md
index 67e53a4fe7..72ee8a8535 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/map-data-across-the-globe.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/map-data-across-the-globe.english.md
@@ -14,7 +14,7 @@ Fulfill the following <a href='https://en.wikipedia.org/wiki/User_story' target=
 <strong>User Story:</strong> I can mouse over the meteorite's data point for additional data.
 <strong>Hint:</strong> Here's a dataset you can use to build this: <a href='https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/meteorite-strike-data.json' target='_blank'>https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/meteorite-strike-data.json</a>
 Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck.
-When you are finished, click the "I've completed this challenge" button and include a link to your CodePen. 
+When you are finished, click the "I've completed this challenge" button and include a link to your CodePen.
 You can get feedback on your project by sharing it with your friends on Facebook.
 </section>
 
diff --git a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/p2p-video-chat-application.english.md b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/p2p-video-chat-application.english.md
index 14b3c6af0f..ed5c4e337e 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/p2p-video-chat-application.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/p2p-video-chat-application.english.md
@@ -9,14 +9,14 @@ isRequired: false
 <section id='description'>
 <strong>Objective:</strong> Build a <a href='https://glitch.com' target='_blank'>Glitch</a> app that is functionally similar to this: <a href='https://grove-voice.glitch.me/' target='_blank'>https://grove-voice.glitch.me</a>.
 Fulfill the below <a href='https://en.wikipedia.org/wiki/User_story' target='_blank'>user stories</a>. Use whichever libraries or APIs you need. Give it your own personal style.
-<strong>User Story:</strong> Upon arriving, the browser will prompt me to access my camera and microphone. 
+<strong>User Story:</strong> Upon arriving, the browser will prompt me to access my camera and microphone.
 <strong>User Story:</strong> After I give it permission, I am prompted to type in a room name.
-<strong>User Story:</strong> Once I type in the room name, a room will be created if no room of that name existed before. 
-<strong>User Story:</strong> A friend of mine can subsequently go to the same website, type in the same room I entered, and join the same room, then enter into a video chat with me. 
-<strong>User Story:</strong> If I type in a room name, and there are already two people in that room, I get a notification that the room is full. 
-<strong>User Story:</strong> Anyone can create or join any room. And there can be any number of rooms, but all of them must have unique names. 
-<strong>User Story:</strong> I can choose to not permit the site to access my microphone and webcam. If I choose not to do this, if some other driver problem occurs, I see an error message saying these are required. 
-<strong>User Story:</strong> When I choose to cancel the room name input step, or if I type in no name, or just spaces, it should again ask me again to type in a valid room name. 
+<strong>User Story:</strong> Once I type in the room name, a room will be created if no room of that name existed before.
+<strong>User Story:</strong> A friend of mine can subsequently go to the same website, type in the same room I entered, and join the same room, then enter into a video chat with me.
+<strong>User Story:</strong> If I type in a room name, and there are already two people in that room, I get a notification that the room is full.
+<strong>User Story:</strong> Anyone can create or join any room. And there can be any number of rooms, but all of them must have unique names.
+<strong>User Story:</strong> I can choose to not permit the site to access my microphone and webcam. If I choose not to do this, if some other driver problem occurs, I see an error message saying these are required.
+<strong>User Story:</strong> When I choose to cancel the room name input step, or if I type in no name, or just spaces, it should again ask me again to type in a valid room name.
 <strong>User Story:</strong> If one of the two people in the room get disconnected, they can reconnect to the same room and continue chatting.
 Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck.
 When you are finished, click the "I've completed this challenge" button and include a link to your Glitch App.
diff --git a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.english.md b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.english.md
index 68a7ac7fbd..243664127f 100644
--- a/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.english.md
+++ b/curriculum/challenges/english/08-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.english.md
@@ -14,7 +14,7 @@ Fulfill the following <a href='https://en.wikipedia.org/wiki/User_story' target=
 <strong>Hint:</strong> Here's a dataset you can use to build this: <a href='https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json' target='_blank'>https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json</a>
 <strong>Hint:</strong> You can create a spritesheet of national flags at <a href='https://www.flag-sprites.com' target='_blank'>https://www.flag-sprites.com</a>.
 Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck.
-When you are finished, click the "I've completed this challenge" button and include a link to your CodePen. 
+When you are finished, click the "I've completed this challenge" button and include a link to your CodePen.
 You can get feedback on your project by sharing it with your friends on Facebook.
 </section>