// 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 final int length
/// Returns the number of elements in this.
/// @description Checks that method returns size of collection.
/// @author kaigorodov

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

main() {
  DoubleLinkedQueue list = new DoubleLinkedQueue();
  Expect.isTrue(list.length == 0);
  
  for(int i = 0; i < 100; i++) {
    list.addLast(i);
    Expect.isTrue(list.length == i + 1);
  }
}