| // Copyright (c) 2013, 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. |
| |
| // Test merging streams. |
| library dart.test.stream_from_iterable; |
| |
| import "dart:async"; |
| import '../../../pkg/unittest/lib/unittest.dart'; |
| |
| watchMs(Stopwatch watch) { |
| int microsecs = watch.elapsedMicroseconds; |
| // Give it some slack. The Stopwatch is more precise than the timers. This |
| // means that we sometimes get 3995 microseconds instead of 4+ milliseconds. |
| // 200 microseconds should largely account for this discrepancy. |
| return (microsecs + 200) ~/ 1000; |
| } |
| |
| main() { |
| test("stream-periodic4", () { |
| Stopwatch watch = new Stopwatch()..start(); |
| Stream stream = new Stream.periodic(const Duration(milliseconds: 5), |
| (x) => x); |
| var subscription; |
| subscription = stream.take(10).listen((i) { |
| int ms = watchMs(watch); |
| expect(ms, lessThan(100)); |
| watch.reset(); |
| if (i == 2) { |
| subscription.pause(); |
| watch.stop(); |
| new Timer(const Duration(milliseconds: 150), () { |
| watch.start(); |
| subscription.resume(); |
| }); |
| } |
| }, onDone: expectAsync0(() { })); |
| }); |
| } |