| /* |
| * 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 Stream<T> where(bool test(T event)) |
| * Creates a new stream from this stream that discards some data events. |
| * The new stream sends the same error and done events as this stream, but it only |
| * sends the data events that satisfy the test. |
| * @description Checks that all stream events are checked by the test. |
| * Checks that the stream sends only the data events that satisfy the test. |
| * @author kaigorodov |
| */ |
| |
| import "dart:async"; |
| import "../../../Utils/async_utils.dart"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(Iterable data, bool test(int element)) { |
| Stream s=new Stream.fromIterable(data); |
| List collected=new List(); |
| bool _test(element){ |
| if (test(element)) { |
| return true; |
| } else { |
| collected.add(element); |
| return false; |
| } |
| } |
| asyncStart(); |
| Stream sw=s.where(_test); |
| sw.listen((int value){ |
| Expect.isTrue(test(value)); |
| collected.add(value); |
| }, |
| onDone:() { |
| Expect.setEquals(data, collected); |
| asyncEnd(); |
| } |
| ); |
| } |
| |
| main() { |
| check([1,2,3,null], (int element)=>element==null); |
| check([1,2,3], (int element)=>element>2); |
| check(new Iterable.generate(10, (int index)=>index*5), (int element)=>element==30); |
| } |