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internal/tempdir/tempdir_test.go

@@ -29,16 +29,28 @@ func TestOutsideHonorsRelativeTemporaryDirectory(t *testing.T) {
 	}
 }
 
-func TestOutsideRejectsAndCleansStorageInsideWorktree(t *testing.T) {
-	repository := t.TempDir()
-	setTemporaryDirectory(t, repository)
-	if directory, err := Outside(repository, "fixture-"); err == nil {
-		os.RemoveAll(directory)
-		t.Fatal("storage created inside worktree")
+func TestOutsideFallsBackWhenTemporaryDirectoryIsInsideWorktree(t *testing.T) {
+	parent := t.TempDir()
+	repository := filepath.Join(parent, "worktree")
+	if err := os.Mkdir(repository, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	localTemporary := filepath.Join(repository, "tmp")
+	if err := os.Mkdir(localTemporary, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	setTemporaryDirectory(t, localTemporary)
+	directory, err := Outside(repository, "fixture-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(directory)
+	if filepath.Dir(directory) != parent {
+		t.Fatalf("temporary storage=%q want external parent %q", directory, parent)
 	}
 	remaining, err := os.ReadDir(repository)
-	if err != nil || len(remaining) != 0 {
-		t.Fatalf("temporary storage left behind: %v %v", remaining, err)
+	if err != nil || len(remaining) != 1 || remaining[0].Name() != "tmp" {
+		t.Fatalf("temporary storage left behind in worktree: %v %v", remaining, err)
 	}
 }