| // Copyright (c) 2020, 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 |
| |
| library async_start_test; |
| |
| import "dart:async"; |
| |
| import "package:expect/expect.dart"; |
| |
| void main() async { |
| var results = []; |
| |
| f() async* { |
| yield 0; |
| yield 1; |
| yield 2; |
| } |
| |
| //Broken, the value 1 was lost. |
| await for (var i in f()) { |
| results.add(i); |
| if (i == 0) { |
| // This should pause the stream subscription. |
| await Future.delayed(Duration(milliseconds: 500)); |
| } |
| } |
| |
| Expect.listEquals([0, 1, 2], results); |
| } |