LibTest/math/MutableRectangle/hashCode_A02_t01.dart

// Copyright (c) 2017, 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 int hashCode
/// ...
/// Hash codes must be the same for objects that are equal to each other
/// according to ==. The hash code of an object should only change if the object
/// changes in a way that affects equality.
/// @description Checks that hash codes must be the same for objects that are
/// equal to each other according to ==.
/// @author ngl@unipro.ru

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

main() {
  var obj1 = new MutableRectangle(3, 5, 10, 8);
  var obj2 = new MutableRectangle(3, 5, 10, 8);

  Expect.isTrue(obj1 == obj2);
  Expect.isTrue(obj1.hashCode == obj2.hashCode);

  obj1.top = 1;
  Expect.isFalse(obj1 == obj2);
  Expect.isFalse(obj1.hashCode == obj2.hashCode);

  obj2.top = 1;
  Expect.isTrue(obj1 == obj2);
  Expect.isTrue(obj1.hashCode == obj2.hashCode);
}