restore deleted example test

Author: trusktr

Diff for: test/unit/example.test.js

@@ -120,4 +120,19 @@ describe(`Example Tests`, function () {
       expect(greeting).toBe(`Good night, John!`);
     });
   });
+
+  describe('Verify Special Changes Test Case', function () {
+    test('document.querySelector with id=pure number', () => {
+      const testText = 'This is a test';
+      const testHTML = `<div id=24><p>${testText}</p></div>`;
+
+      // Inject HTML
+      document.body.innerHTML = testHTML;
+      expect(() => {
+        document.querySelector('#24');
+      }).toThrow(DOMException);
+
+      expect(document.querySelector("[id='24']").textContent).toBe(testText);
+    });
+  });
 });