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);
}