| // Copyright (c) 2013, 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 'package:async_helper/async_helper.dart'; |
| import "package:expect/expect.dart"; |
| import 'dart:async'; |
| |
| class MyFuture<T> implements Future<T> { |
| Future<S> then<S>(FutureOr<S> valueHandler(T x), {Function onError}) { |
| scheduleMicrotask(() { |
| valueHandler(null); |
| }); |
| return null; |
| } |
| |
| catchError(_, {test}) => null; |
| whenComplete(_) => null; |
| asStream() => null; |
| timeout(Duration timeLimit, {void onTimeout()}) => null; |
| } |
| |
| main() { |
| asyncStart(); |
| Completer completer = new Completer(); |
| completer.complete(new MyFuture()); |
| Expect.isTrue(completer.isCompleted); |
| Expect.throws(() => completer.complete(42)); |
| completer.future.then((_) => asyncEnd()); |
| } |