| /* |
| * 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 StreamSubscription<T> listen(void onData(T event), |
| * {Function onError, void onDone(), bool cancelOnError}) |
| * Adds a subscription to this stream. |
| * If onData is null, nothing happens. |
| * @description Checks that onData can be null. |
| * @author kaigorodov |
| */ |
| library listen_A02_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(Stream s) { |
| asyncStart(); |
| s.listen(null, |
| onDone: () { |
| asyncEnd(); |
| } |
| ); |
| } |
| |
| void test(CreateStreamFunction create) { |
| check(create([])); |
| check(create([1, 2, 3, 4])); |
| check(create([null, "2", -3, 4.0, []])); |
| } |