| // Copyright (c) 2016, 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 If f is marked async*, then a fresh instance s implementing |
| /// the built-in class Stream is associated with the invocation and |
| /// immediately returned. When s is listened to, execution of the body of f will |
| /// begin. When f terminates: |
| /// • If the current return value is defined then, if s has been canceled |
| /// then its cancellation future is completed with null. |
| /// • If the current exception x is defined: |
| /// – x is added to s. |
| /// – If s has been canceled then its cancellation future is completed with |
| /// x as an error. |
| /// • s is closed. |
| /// |
| /// @description Check that s is closed if the current return value is defined |
| /// and s has not been canceled. |
| /// |
| /// @author a.semenov@unipro.ru |
| /// @issue 42220 |
| |
| import 'dart:async'; |
| import '../../../Utils/expect.dart'; |
| |
| int sum = 0; |
| |
| Stream generator() async* { |
| for (int i = 0; i < 10000; i++) { |
| sum += i; |
| yield sum; |
| } |
| } |
| |
| main() { |
| asyncStart(); |
| Stream stream = generator(); |
| stream.listen( |
| (_) {}, |
| onDone: () { |
| // make sure the generator function has finished |
| Expect.equals(49995000, sum); |
| asyncEnd(); |
| } |
| ); |
| } |