LibTest/core/String/String_class_A01_t01.dart

// Copyright (c) 2011, 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.

// @dart = 2.9

/// @assertion The String class represents character strings. Strings are
/// immutable.
/// @description Checks that invoking various methods of String class doesn't
/// change the original object
/// @author msyabro

import "../../../Utils/expect.dart";

main() {
  String s = "Immutable String ";
  String str = "Immutable String ";

  str.substring(0, 1);
  Expect.isTrue(str == s);

  str.toLowerCase();
  Expect.isTrue(str == s);

  str.toUpperCase();
  Expect.isTrue(str == s);

  str.trim();
  Expect.isTrue(str == s);

  str.replaceFirst("mm", "m");
  Expect.isTrue(str == s);

  str.replaceAll("mm", "m");
  Expect.isTrue(str == s);
}