fix: remove comments before tests (#35906)

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.english.md

@@ -23,9 +23,9 @@ Refactor the function <code>setGear</code> inside the object <code>bicycle</code
 ```yml
 tests:
   - text: Traditional function expression should not be used.
-    testString: getUserInput => assert(!getUserInput('index').match(/function/));
+    testString: getUserInput => assert(!removeJSComments(code).match(/function/));
   - text: <code>setGear</code> should be a declarative function.
-    testString: getUserInput => assert(typeof bicycle.setGear === 'function' && getUserInput('index').match(/setGear\s*\(.+\)\s*\{/));
+    testString: assert(typeof bicycle.setGear === 'function' && code.match(/setGear\s*\(.+\)\s*\{/));
   - text: <code>bicycle.setGear(48)</code> should change the <code>gear</code> value to 48.
     testString: assert((new bicycle.setGear(48)).gear === 48);
 
@@ -53,6 +53,15 @@ console.log(bicycle.gear);
 
 </div>
 
+### After Test
+<div id='js-teardown'>
+
+```js
+const removeJSComments = str => str.replace(/\/\*[\s\S]*?\*\/|\/\/.*$/gm, '');
+```
+
+</div>
+
 </section>
 
 ## Solution