fix(curriculum): improve test for profile card step 4 (#61992)

curriculum/challenges/english/blocks/workshop-reusable-profile-card-component/674ef2d357676e50e469165a.md

@@ -19,14 +19,17 @@ You should export an `App` functional component.
 assert.isFunction(window.index.App);
 ```
 
-Your `App` component should return an empty string.
+Your `App` component should return a pair of parentheses with an empty string inside.
 
 ```js
-// This isn't a perfect test, since various return values are converted into
-// empty strings, but it has to be a valid React component.
-async() => {
-  const testElem = await __helpers.prepTestComponent(window.index.App);
-  assert.equal(testElem.textContent, '');
+async () => {
+  const functionRegex = __helpers.functionRegex("App", null, { capture: true });
+  const match = code.match(functionRegex);
+  const functionDefinition = match[0];
+  assert.match(
+    functionDefinition,
+    /\s*{\s*return\s*\(\s*(''|""|``)\s*\)\s*;?\s*}|\s*=>\s*\(\s*(''|""|``)\s*\)/
+  );
 }
 ```