LibTest/io/FileSystemEntity/parentOf_A01_t02.dart

// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion parentOf static method
/// ```
/// String parentOf(String path)
/// ```
/// The parent path of a path.
///
/// Finds the final path component of a path, using the platform's path
/// separator to split the path, and returns the prefix up to that part.
///
/// Will not remove the root component of a Windows path, like "C:\" or
/// "\\server_name\". Includes a trailing path separator in the last part of
/// path, and leaves no trailing path separator.
///
/// @description Checks that this method returns the final path component of a
/// path. Test absolute paths.
/// @author sgrekhov22@gmail.com

import 'dart:io';
import '../../../Utils/expect.dart';

main() {
  test('/a/b/c', '/a/b');
  test('/a/b/c/', '/a/b');
  test('/a', '/');
  test('/../a/', '/..');
  test('/.', '/');
  test('/', '/');
  test('/..', '/');
  test('/...', '/');
  test('/....', '/');
  test('/,', '/');
  test('/a b/file.txt', '/a b');
  test('/a b/file,with comma.txt', '/a b');
  test('/a b/dir,with comma/file.txt', '/a b/dir,with comma');
  test('/a b:c,d#e;f?g/a b:c,d#e;f?g/', '/a b:c,d#e;f?g');
  test("/a'b/c'd", "/a'b");
  test('/./', '/');
}

void test(String path, String expected) {
  Expect.equals(
    toPlatformPath(expected),
    FileSystemEntity.parentOf(toPlatformPath(path)),
  );
}

String toPlatformPath(String path) =>
    path.replaceAll('/', Platform.pathSeparator);