1 files changed, 61 insertions, 0 deletions
diff --git a/internal/api/render_test.go b/internal/api/render_test.go
new file mode 100644
index 00000000..d77518d9
--- /dev/null
+++ b/internal/api/render_test.go
@@ -0,0 +1,61 @@
+// Copyright 2026 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package api
+
+import (
+	"context"
+	"go/parser"
+	"go/token"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"golang.org/x/pkgsite/internal/godoc"
+)
+
+func TestRenderDoc(t *testing.T) {
+	src, err := os.ReadFile("testdata/pkg.go")
+	if err != nil {
+		t.Fatal(err)
+	}
+	fset := token.NewFileSet()
+	pf, err := parser.ParseFile(fset, "p.go", src, parser.ParseComments)
+	if err != nil {
+		t.Fatal(err)
+	}
+	docPkg := godoc.NewPackage(fset, nil)
+	docPkg.AddFile(pf, true)
+	gpkg, err := docPkg.Encode(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	decoded, err := godoc.DecodePackage(gpkg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dpkg, err := decoded.DocPackage("p", &godoc.ModuleInfo{ModulePath: "p", ResolvedVersion: "v1.0.0"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var sb strings.Builder
+	tr := &textRenderer{fset: decoded.Fset, w: &sb}
+	if err := renderDoc(dpkg, tr); err != nil {
+		t.Fatal(err)
+	}
+	got := strings.TrimSpace(sb.String())
+	wantBytes, err := os.ReadFile(filepath.FromSlash("testdata/text.golden"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := strings.TrimSpace(string(wantBytes))
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("mismatch (-want +got):\n%s", diff)
+	}
+}