| // 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({void onListen(), void onPause(), |
| /// void onResume(), dynamic onCancel(), bool sync: false}) |
| /// If onCancel needs to perform an asynchronous operation, onCancel should |
| /// return a future that completes when the cancel operation is done. |
| /// |
| /// @description Checks that stream subscription is cancelled only after |
| /// the Future returned by onCancel function is completed. |
| /// @author a.semenov@unipro.ru |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| asyncStart(); |
| bool onCancelFutureComplete = false; |
| StreamController controller = new StreamController( |
| onCancel: () => new Future.delayed( |
| durationInMilliseconds(100), |
| () { |
| onCancelFutureComplete = true; |
| } |
| ) |
| ); |
| |
| Expect.isFalse(onCancelFutureComplete); |
| StreamSubscription subs = controller.stream.listen((event) {}); |
| |
| new Future(() => subs.cancel()).then( |
| (_) { |
| Expect.isTrue(onCancelFutureComplete); |
| asyncEnd(); |
| } |
| ); |
| } |