| // 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. |
| |
| /// @assertion final bool isEmpty |
| /// Returns [true] if there is no element in this collection. |
| /// @description Checks that method returns [true] only if queue is empty. |
| /// @author kaigorodov |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| main() { |
| DoubleLinkedQueue list = new DoubleLinkedQueue(); |
| |
| Expect.isTrue(list.isEmpty); |
| |
| list.addLast(1); |
| Expect.isFalse(list.isEmpty); |
| Expect.isFalse(list.isEmpty); |
| Expect.isFalse(list.isEmpty); |
| |
| list.addFirst(1); |
| Expect.isFalse(list.isEmpty); |
| |
| list.removeFirst(); |
| Expect.isFalse(list.isEmpty); |
| list.removeFirst(); |
| Expect.isTrue(list.isEmpty); |
| Expect.isTrue(list.isEmpty); |
| } |