| // 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. |
| |
| // @dart = 2.9 |
| |
| // Test merging streams. |
| library dart.test.stream_from_iterable; |
| |
| import 'dart:async'; |
| |
| import 'package:async_helper/async_minitest.dart'; |
| |
| void runTest(period, maxElapsed, pauseDuration) { |
| Function done = expectAsync(() {}); |
| |
| Stopwatch watch = new Stopwatch()..start(); |
| Stream stream = new Stream.periodic(period, (x) => x); |
| var subscription; |
| subscription = stream.take(5).listen((i) { |
| if (watch.elapsed > maxElapsed) { |
| // Test failed in this configuration. Try with more time (or give up |
| // if we reached an unreasonable maxElapsed). |
| if (maxElapsed > const Duration(seconds: 2)) { |
| // Give up. |
| expect(true, false); |
| } else { |
| subscription.cancel(); |
| // Call 'done' ourself, since it won't be invoked in the onDone handler. |
| runTest(period * 2, maxElapsed * 2, pauseDuration * 2); |
| done(); |
| return; |
| } |
| } |
| watch.reset(); |
| if (i == 2) { |
| subscription.pause(); |
| watch.stop(); |
| new Timer(pauseDuration, () { |
| watch.start(); |
| subscription.resume(); |
| }); |
| } |
| }, onDone: done); |
| } |
| |
| main() { |
| test("stream-periodic4", () { |
| runTest(const Duration(milliseconds: 2), const Duration(milliseconds: 8), |
| const Duration(milliseconds: 10)); |
| }); |
| } |