fix(curriculum): Made tests not accept invalid HTML (#35774)

* fix: made tests stricter

* fix: simplify text

Co-Authored-By: RandellDawson <5313213+RandellDawson@users.noreply.github.com>

curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/add-images-to-your-website.english.md

@@ -33,11 +33,11 @@ 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);
   - 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($("img").attr("src")), 'Your image should have a <code>src</code> attribute that points to the kitten image.');
-  - text: Your image element <strong>must</strong> have an <code>alt</code> attribute.
-    testString: assert(code.match(/alt\s*?=\s*?(\"|\').*(\"|\')/), 'Your image element <strong>must</strong> have an <code>alt</code> attribute.');
+    testString: assert(/^https:\/\/bit\.ly\/fcc-relaxing-cat$/i.test($("img").attr("src")));
+  - text: Your image element's <code>alt</code> attribute <strong>must</strong> not be empty.
+    testString: assert($("img").attr("alt") && $("img").attr("alt").length && /<img\S*alt=(['"])(?!\1|>)\S+\1\S*\/?>/.test(code.replace(/\s/g,'')));
 
 ```