| /* |
| * 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 |
| * Returns the first element of the stream. |
| * @description Checks that the first element is returned. |
| * @author kaigorodov |
| */ |
| |
| import "dart:async"; |
| import "../../../Utils/async_utils.dart"; |
| import "../../../Utils/expect.dart"; |
| |
| const VAL=123; |
| |
| void check(Stream s) { |
| asyncStart(); |
| s.first.then((value){ |
| Expect.equals(VAL, value); |
| asyncEnd(); |
| }); |
| } |
| |
| main() { |
| check(new Stream.fromFuture(new Future.sync(() => VAL))); |
| check(new Stream.fromFuture(new Future(() => VAL))); |
| |
| // using completable future |
| Completer completer = new Completer(); |
| check(new Stream.fromFuture(completer.future)); |
| completer.complete(VAL); |
| |
| // using fromIterable |
| check(new Stream.fromIterable([VAL,2,3])); |
| check(new Stream.fromIterable(new Iterable.generate(1, (int index)=>VAL))); |
| |
| // using periodic |
| Stream s=new Stream.periodic(durationMs(0), (computationCount)=>VAL); |
| check(s); |
| } |
| |