Fix markdown frontmatter rendering (#34102) (#34107)

Backport #34102
Fix #34101

modules/markup/markdown/markdown_test.go

@@ -383,18 +383,74 @@ func TestColorPreview(t *testing.T) {
 	}
 }
 
-func TestTaskList(t *testing.T) {
+func TestMarkdownFrontmatter(t *testing.T) {
 	testcases := []struct {
-		testcase string
+		name     string
+		input    string
 		expected string
 	}{
+		{
+			"MapInFrontmatter",
+			`---
+key1: val1
+key2: val2
+---
+test
+`,
+			`<details class="frontmatter-content"><summary><span>octicon-table(12/)</span> key1, key2</summary><table>
+<thead>
+<tr>
+<th>key1</th>
+<th>key2</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>val1</td>
+<td>val2</td>
+</tr>
+</tbody>
+</table>
+</details><p>test</p>
+`,
+		},
+
+		{
+			"ListInFrontmatter",
+			`---
+- item1
+- item2
+---
+test
+`,
+			`- item1
+- item2
+
+<p>test</p>
+`,
+		},
+
+		{
+			"StringInFrontmatter",
+			`---
+anything
+---
+test
+`,
+			`anything
+
+<p>test</p>
+`,
+		},
+
 		{
 			// data-source-position should take into account YAML frontmatter.
+			"ListAfterFrontmatter",
 			`---
 foo: bar
 ---
 - [ ] task 1`,
-			`<details><summary><i class="icon table"></i></summary><table>
+			`<details class="frontmatter-content"><summary><span>octicon-table(12/)</span> foo</summary><table>
 <thead>
 <tr>
 <th>foo</th>
@@ -414,9 +470,9 @@ foo: bar
 	}
 
 	for _, test := range testcases {
-		res, err := markdown.RenderString(markup.NewTestRenderContext(), test.testcase)
-		assert.NoError(t, err, "Unexpected error in testcase: %q", test.testcase)
-		assert.Equal(t, template.HTML(test.expected), res, "Unexpected result in testcase %q", test.testcase)
+		res, err := markdown.RenderString(markup.NewTestRenderContext(), test.input)
+		assert.NoError(t, err, "Unexpected error in testcase: %q", test.name)
+		assert.Equal(t, test.expected, string(res), "Unexpected result in testcase %q", test.name)
 	}
 }