| /* |
| * 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 factory StreamTransformer(StreamSubscription<T> |
| * transformer(Stream<S> stream, bool cancelOnError)) |
| * Creates a StreamTransformer. |
| * |
| * The returned instance takes responsibility of implementing (bind). When |
| * the user invokes bind it returns a new "bound" stream. Only when the user |
| * starts listening to the bound stream, the listen method invokes the given |
| * closure transformer. |
| * |
| * @description Checks that [transformer] closure is invoked when stream gets a |
| * subscription. |
| * @author ilya |
| */ |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| Stream<int> s = new Stream.fromIterable([1]); |
| StreamTransformer<int, dynamic> tr = new StreamTransformer( |
| (stream, cancelOnError) { |
| asyncEnd(); |
| return stream.listen(null); |
| } |
| ); |
| |
| asyncStart(); |
| s.transform(tr).toList(); |
| } |