Add extension normalization command

tests/integration/extension_undo_test.go

@@ -0,0 +1,52 @@
+package integration
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+)
+
+func TestExtensionAutomationUndo(t *testing.T) {
+	t.Parallel()
+
+	tmp := t.TempDir()
+	createFile(t, filepath.Join(tmp, "config.yaml"))
+	createFile(t, filepath.Join(tmp, "notes.yml"))
+
+	var applyOut bytes.Buffer
+	apply := renamercmd.NewRootCommand()
+	apply.SetOut(&applyOut)
+	apply.SetErr(&applyOut)
+	apply.SetArgs([]string{"extension", ".yaml", ".yml", ".yml", "--yes", "--path", tmp})
+
+	if err := apply.Execute(); err != nil {
+		t.Fatalf("automation apply failed: %v\noutput: %s", err, applyOut.String())
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "config.yml")); err != nil {
+		t.Fatalf("expected config.yml after apply: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(tmp, "config.yaml")); !os.IsNotExist(err) {
+		t.Fatalf("expected config.yaml renamed, err=%v", err)
+	}
+
+	var undoOut bytes.Buffer
+	undo := renamercmd.NewRootCommand()
+	undo.SetOut(&undoOut)
+	undo.SetErr(&undoOut)
+	undo.SetArgs([]string{"undo", "--path", tmp})
+
+	if err := undo.Execute(); err != nil {
+		t.Fatalf("undo failed: %v\noutput: %s", err, undoOut.String())
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "config.yaml")); err != nil {
+		t.Fatalf("expected config.yaml after undo: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(tmp, "config.yml")); !os.IsNotExist(err) {
+		t.Fatalf("expected config.yml removed after undo, err=%v", err)
+	}
+}