| // 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 prepend(E e) → void |
| /// Prepends the given [e] as entry just before this entry. |
| /// @description Checks that [prepend()] adds element before this one |
| /// @author sgrekhov@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| main() { |
| DoubleLinkedQueueEntry e = new DoubleLinkedQueueEntry(1); |
| e.prepend(2); |
| |
| Expect.equals(2, e.previousEntry()?.element); |
| Expect.isNull(e.nextEntry()); |
| } |