| // Copyright (c) 2015, 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. |
| |
| // @dart = 2.9 |
| |
| import "dart:async"; |
| import "package:expect/expect.dart"; |
| import "package:async_helper/async_helper.dart"; |
| |
| main() { |
| asyncStart(); |
| |
| bool waitedForCancel = false; |
| |
| var controller = new StreamController( |
| onCancel: () => new Future(() => waitedForCancel = true)); |
| var sub = controller.stream.take(1).listen((x) { |
| Expect.fail("onData should not be called"); |
| }); |
| var cancelFuture = sub.cancel(); |
| Expect.isNotNull(cancelFuture); |
| cancelFuture.then((_) { |
| Expect.isTrue(waitedForCancel); |
| asyncEnd(); |
| }); |
| } |