// 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.

// @dart = 2.9

/// @assertion hashCode → int
/// Get a hash code for this object.…
/// read-only, inherited
/// @description Checks that hashCode is constant in time even if element
/// is changed
/// @author a.semenov@unipro.ru

import "../../../Utils/expect.dart";
import "dart:collection";
import "dart:math";
main() {
  DoubleLinkedQueueEntry d = new DoubleLinkedQueueEntry(pi);
  int hashCode = d.hashCode;
  for (Object o in [e, double.nan, -1, "hello", d]){
    d.element = o;
    Expect.equals(hashCode, d.hashCode);
  }
}