Add tests reflecting #19390 (#19477)

* Add test reflecting #19390

Added two tests to prevent checking only `Alan`.

* Split into 4 tests for each prop

Split previous tests with 2 props on each into 4 single-prop tests; fixed whitespace

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/check-if-an-object-has-a-property.english.md

@@ -20,13 +20,18 @@ 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> is not a property on the <code>users</code> object'
+    testString: 'assert((function() { delete users.Alan; return isEveryoneHere(users) })() === false, "The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Alan</code> is not a property on the <code>users</code> object");'
+  - text: 'The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Jeff</code> is not a property on the <code>users</code> object'
+    testString: 'assert((function() { delete users.Jeff; return isEveryoneHere(users) })() === false, "The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Jeff</code> is not a property on the <code>users</code> object");'
+  - text: 'The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Sarah</code> is not a property on the <code>users</code> object'
+    testString: 'assert((function() { delete users.Sarah; return isEveryoneHere(users) })() === false, "The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Sarah</code> is not a property on the <code>users</code> object");'
+  - text: 'The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Ryan</code> is not a property on the <code>users</code> object'
+    testString: 'assert((function() { delete users.Ryan; return isEveryoneHere(users) })() === false, "The function <code>isEveryoneHere</code> returns <code>false</code> if <code>Ryan</code> is not a property on the <code>users</code> object");'
 ```
 
 </section>