plan 9: property test compares directories and refuses to pass vacuously; undo tracks directories trash restores recreate

1 files changed, 21 insertions, 0 deletions

diff --git a/internal/engine/roundtrip_test.go b/internal/engine/roundtrip_test.go
index 67de507..e54b0b7 100644
--- a/internal/engine/roundtrip_test.go
+++ b/internal/engine/roundtrip_test.go
@@ -44,6 +44,27 @@ func snapshot(t *testing.T, root string) map[string]string {
 	return out
 }
 
+// treeSnapshot is snapshot plus one "dir" entry per directory under root,
+// so a comparison also sees directories left behind or missing.
+func treeSnapshot(t *testing.T, root string) map[string]string {
+	t.Helper()
+	out := snapshot(t, root)
+	err := filepath.WalkDir(root, func(p string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() && p != root {
+			rel, _ := filepath.Rel(root, p)
+			out[rel+"/"] = "dir"
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return out
+}
+
 func TestApplyThenUndoRestoresTheTree(t *testing.T) {
 	h := sandbox(t)
 	dl := filepath.Join(h, "dl")