Initial commit

Assisted-by: GLM 5.3

internal/markdown/golden_test.go

@@ -0,0 +1,56 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
+
+package markdown
+
+import (
+	"flag"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+var update = flag.Bool("update", false, "rewrite golden files")
+
+// TestGoldenCorpus renders every corpus file and compares against the
+// committed golden output. Run `go test ./internal/markdown -update` to
+// regenerate after an intentional rendering change.
+func TestGoldenCorpus(t *testing.T) {
+	corpusDir := filepath.Join("testdata", "corpus")
+	entries, err := os.ReadDir(corpusDir)
+	if err != nil {
+		t.Fatalf("read corpus: %v", err)
+	}
+	for _, entry := range entries {
+		if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".md") {
+			continue
+		}
+		name := strings.TrimSuffix(entry.Name(), ".md")
+		t.Run(name, func(t *testing.T) {
+			src, err := os.ReadFile(filepath.Join(corpusDir, entry.Name()))
+			if err != nil {
+				t.Fatalf("read corpus file: %v", err)
+			}
+			htmlOut, toc, err := RenderWithTOC(string(src))
+			if err != nil {
+				t.Fatalf("RenderWithTOC: %v", err)
+			}
+			got := "=== HTML ===\n" + htmlOut + "=== TOC ===\n" + toc
+			goldenPath := filepath.Join("testdata", name+".html")
+			if *update {
+				if err := os.WriteFile(goldenPath, []byte(got), 0o644); err != nil {
+					t.Fatalf("write golden: %v", err)
+				}
+				return
+			}
+			want, err := os.ReadFile(goldenPath)
+			if err != nil {
+				t.Fatalf("read golden (run with -update): %v", err)
+			}
+			if got != string(want) {
+				t.Fatalf("output differs from golden:\n--- got ---\n%s\n--- want ---\n%s", got, want)
+			}
+		})
+	}
+}