| // Copyright (c) 2016, 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 isNotEmpty |
| /// May be computed by checking if [iterator.moveNext()] returns [true]. |
| /// @description Checks that method returns true only if queue is not empty. |
| /// @author iarkh@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| main() { |
| DoubleLinkedQueue list = new DoubleLinkedQueue(); |
| Expect.equals(list.isNotEmpty, list.iterator.moveNext()); |
| list.addLast(1); |
| Expect.equals(list.isNotEmpty, list.iterator.moveNext()); |
| list.addFirst(1); |
| Expect.equals(list.isNotEmpty, list.iterator.moveNext()); |
| list.removeFirst(); |
| Expect.equals(list.isNotEmpty, list.iterator.moveNext()); |
| list.removeFirst(); |
| Expect.equals(list.isNotEmpty, list.iterator.moveNext()); |
| } |