MVP: 按 07 风格重写前端 + Go 后端落地（长文/短文、编辑器、后台管理）

backend/internal/render/markdown_test.go

@@ -0,0 +1,49 @@
+package render
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestMarkdownRendersStructure(t *testing.T) {
+	out := Markdown("## 标题\n\n正文 **粗体**。\n\n- 一\n- 二\n\n> 引用\n")
+	for _, want := range []string{"<h2", "<strong>粗体</strong>", "<li>一</li>", "<blockquote>"} {
+		if !strings.Contains(out, want) {
+			t.Errorf("missing %q in %q", want, out)
+		}
+	}
+}
+
+func TestMarkdownEscapesRawHTML(t *testing.T) {
+	out := Markdown("<script>alert(1)</script>")
+	if strings.Contains(out, "<script>") {
+		t.Errorf("raw HTML should be escaped, got %q", out)
+	}
+}
+
+func TestMarkdownBlocksUnsafeSchemes(t *testing.T) {
+	out := Markdown(`[x](javascript:alert(1))`)
+	if strings.Contains(out, "javascript:") {
+		t.Errorf("unsafe scheme should be stripped, got %q", out)
+	}
+}
+
+func TestReadingMinutes(t *testing.T) {
+	if got := ReadingMinutes(""); got != 1 {
+		t.Errorf("empty content should be 1 minute, got %d", got)
+	}
+	long := strings.Repeat("字", 1200)
+	if got := ReadingMinutes(long); got != 3 {
+		t.Errorf("1200 CJK chars should be 3 minutes, got %d", got)
+	}
+}
+
+func TestExcerpt(t *testing.T) {
+	got := Excerpt("# 标题\n\n这是正文。\n\n```go\nfmt.Println()\n```", 140)
+	if strings.Contains(got, "fmt.Println") {
+		t.Errorf("code fences should be dropped, got %q", got)
+	}
+	if !strings.Contains(got, "这是正文。") {
+		t.Errorf("excerpt should keep body text, got %q", got)
+	}
+}