| // 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 StreamController.broadcast({void onListen(), void onCancel(), |
| /// bool sync: false}) |
| /// The onListen callback is called when the first listener is subscribed, |
| /// and the onCancel is called when there are no longer any active listeners. |
| /// |
| /// @description Checks that the onListen function is called when the stream |
| /// receives its listener. |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| bool onListenCalled = false; |
| asyncStart(); |
| StreamController controller = new StreamController.broadcast( |
| onListen: () { |
| onListenCalled = true; |
| asyncEnd(); |
| } |
| ); |
| |
| Expect.isFalse(onListenCalled); |
| StreamSubscription subs = controller.stream.listen((event) {}); |
| } |