LibTest/math/Point/hashCode_A01_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
/// The hash code for this object.
/// A hash code is a single integer which represents the state of the object that
/// affects == comparisons.
/// All objects have hash codes. The default hash code represents only the
/// identity of the object, the same way as the default == implementation only
/// considers objects equal if they are identical (see identityHashCode).
/// @description Checks that equals objects have equal hash codes and
/// different objects have different hash codes.
/// @author ngl@unipro.ru

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

main() {
  var obj1 = new Point(3, 5);
  var obj2 = new Point(3, 5);
  var obj3 = new Point(1, 2);
  var obj4 = obj1 + new Point(-2, -3);
  Expect.isTrue(obj1.hashCode == obj1.hashCode);
  Expect.isTrue(obj1.hashCode == obj2.hashCode);
  Expect.isFalse(obj1.hashCode == obj3.hashCode);
  Expect.isFalse(obj2.hashCode == obj3.hashCode);
  Expect.isTrue(obj3.hashCode == obj4.hashCode);
}