| // 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 K firstKey() |
| /// Returns [null] if the map is empty. |
| /// @description Checks that [null] is returned if map is empty |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| SplayTreeMap map = new SplayTreeMap(); |
| Expect.isNull(map.firstKey()); |
| } |