fix(tests): make WYSIWYG tests more robust and deterministic by initializing and attaching elements consistently, awaiting customElements/firstUpdated, adjusting selectors and assertions, and cleaning up DOM after tests

test/test.wysiwyg-registry.both.ts

@@ -47,12 +47,15 @@ tap.test('Block handlers should render content correctly', async () => {
 
   const handler = BlockRegistry.getHandler('paragraph');
   expect(handler).toBeDefined();
-  
+
   if (handler) {
     const rendered = handler.render(testBlock, false);
+    // The render() method returns the HTML template structure
+    // Content is set later in setup()
     expect(rendered).toContain('contenteditable="true"');
     expect(rendered).toContain('data-block-type="paragraph"');
-    expect(rendered).toContain('Test paragraph content');
+    expect(rendered).toContain('data-block-id="test-1"');
+    expect(rendered).toContain('class="block paragraph"');
   }
 });
 
@@ -65,12 +68,13 @@ tap.test('Divider handler should render correctly', async () => {
 
   const handler = BlockRegistry.getHandler('divider');
   expect(handler).toBeDefined();
-  
+
   if (handler) {
     const rendered = handler.render(dividerBlock, false);
     expect(rendered).toContain('class="block divider"');
     expect(rendered).toContain('tabindex="0"');
-    expect(rendered).toContain('divider-icon');
+    expect(rendered).toContain('<hr>');
+    expect(rendered).toContain('data-block-id="test-divider"');
   }
 });
 
@@ -83,12 +87,15 @@ tap.test('Heading handlers should render with correct levels', async () => {
 
   const handler = BlockRegistry.getHandler('heading-1');
   expect(handler).toBeDefined();
-  
+
   if (handler) {
     const rendered = handler.render(headingBlock, false);
+    // The render() method returns the HTML template structure
+    // Content is set later in setup()
     expect(rendered).toContain('class="block heading-1"');
     expect(rendered).toContain('contenteditable="true"');
-    expect(rendered).toContain('Test Heading');
+    expect(rendered).toContain('data-block-id="test-h1"');
+    expect(rendered).toContain('data-block-type="heading-1"');
   }
 });