Add markdown merging test

Author: roblourens

src/vs/workbench/contrib/chat/test/common/__snapshots__/Response_mergeable_markdown.0.snap

@@ -0,0 +1,12 @@
+[
+  {
+    content: {
+      value: "markdown1markdown2",
+      isTrusted: false,
+      supportThemeIcons: false,
+      supportHtml: false,
+      baseUri: undefined
+    },
+    kind: "markdownContent"
+  }
+]

src/vs/workbench/contrib/chat/test/common/__snapshots__/Response_not_mergeable_markdown.0.snap

@@ -0,0 +1,20 @@
+[
+  {
+    content: {
+      value: "markdown1",
+      isTrusted: false,
+      supportThemeIcons: false,
+      supportHtml: true
+    },
+    kind: "markdownContent"
+  },
+  {
+    content: {
+      value: "markdown2",
+      isTrusted: false,
+      supportThemeIcons: false,
+      supportHtml: false
+    },
+    kind: "markdownContent"
+  }
+]

src/vs/workbench/contrib/chat/test/common/chatModel.test.ts

@@ -126,7 +126,7 @@ suite('ChatModel', () => {
 suite('Response', () => {
 	ensureNoDisposablesAreLeakedInTestSuite();
 
-	test('markdown, markdown', async () => {
+	test('mergeable markdown', async () => {
 		const response = new Response([]);
 		response.updateContent({ content: new MarkdownString('markdown1'), kind: 'markdownContent' });
 		response.updateContent({ content: new MarkdownString('markdown2'), kind: 'markdownContent' });
@@ -135,6 +135,15 @@ suite('Response', () => {
 		assert.strictEqual(response.asString(), 'markdown1markdown2');
 	});
 
+	test('not mergeable markdown', async () => {
+		const response = new Response([]);
+		const md1 = new MarkdownString('markdown1');
+		md1.supportHtml = true;
+		response.updateContent({ content: md1, kind: 'markdownContent' });
+		response.updateContent({ content: new MarkdownString('markdown2'), kind: 'markdownContent' });
+		await assertSnapshot(response.value);
+	});
+
 	test('inline reference', async () => {
 		const response = new Response([]);
 		response.updateContent({ content: new MarkdownString('text before'), kind: 'markdownContent' });