| /* |
| * 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 final Future<T> first |
| * If this stream is empty (a done event occurs before the first data event), |
| * the resulting future completes with a StateError. |
| * @description Checks that future completes with a StateError when this |
| * stream is empty. |
| * @author kaigorodov |
| */ |
| |
| import "dart:async"; |
| import "../../../Utils/async_utils.dart"; |
| import "../../../Utils/expect.dart"; |
| import "IsolateStream.dart" as IsolateStream; |
| |
| void check(Stream s) { |
| asyncStart(); |
| s.first.then( |
| (value){ |
| Expect.fail("empty stream returned $value"); |
| }, |
| onError:(error){ |
| Expect.isTrue(error is StateError); |
| asyncEnd(); |
| } |
| ); |
| } |
| |
| main() { |
| check(IsolateStream.fromIterable([])); |
| check(IsolateStream.fromIterable(new Iterable.generate(0, (int index)=>1))); |
| } |