| // 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. |
| /// Except for the type of the error, this method is equivalent to |
| /// this.elementAt(0). |
| /// @description Checks that for non-empty stream, this.first is equivalent to this.elementAt(0). |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| import "IsolateStream.dart" as IsolateStream; |
| |
| const VAL = 123; |
| |
| void check(Stream s) { |
| asyncStart(); |
| s.elementAt(0).then((value) { |
| Expect.equals(VAL, value); |
| asyncEnd(); |
| }); |
| } |
| |
| main() { |
| check(IsolateStream.fromIterable([VAL, 2, 3])); |
| check( |
| IsolateStream.fromIterable(new Iterable.generate(1, (int index) => VAL))); |
| } |