| // 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 E elementAt(int index) |
| /// The [index] must be non-negative and less than [length]. Index zero |
| /// represents the first element (so [iterable.elementAt(0)] is equivalent to |
| /// [iterable.first]). |
| /// @description Checks that a RangeError is thrown if index is incorrect. |
| /// @author kaigorodov |
| |
| import "../../../Utils/expect.dart"; |
| import "dart:collection"; |
| |
| DoubleLinkedQueue queue = new DoubleLinkedQueue(); |
| |
| void check(int index) { |
| Expect.throws(() { queue.elementAt(index); }, (e) => e is RangeError); |
| } |
| |
| main() { |
| check(0); |
| check (-10); |
| |
| queue.addFirst(1); |
| check(1); |
| check(2); |
| check (-10); |
| |
| queue.addFirst(2); |
| check(2); |
| check(10); |
| check (-10); |
| |
| queue.clear(); |
| check(0); |
| check(1000); |
| check (-10); |
| } |