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 9bb5134dac..6c21fe7527 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 +25,11 @@ 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);
   - 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|\[(['"`])keys\2\])/.test(code));
+  - text: Solve this challenge without hardcoding the <code>ownProps</code> array.
+    testString: assert(!/\[\s*(?:'|")(?:name|numLegs)|(?:push|concat)\(\s*(?:'|")(?:name|numLegs)/.test(code));
 
 ```