Sigmund Cherem
fb29d0e96d
This allows to break a circular dependency between package:expect and package:async_helper, which will simplify the support for modular tests using package:modular_test. Change-Id: Ie48723d3f35d51a8fbe622e0158450e8104fe3f5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/102140 Reviewed-by: Johnni Winther <johnniwinther@google.com>
46 lines
1.5 KiB
Dart
46 lines
1.5 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Test merging streams.
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library dart.test.stream_from_iterable;
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import 'dart:async';
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import 'package:async_helper/async_minitest.dart';
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watchMs(Stopwatch watch) {
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int microsecs = watch.elapsedMicroseconds;
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// Give it some slack. The Stopwatch is more precise than the timers. This
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// means that we sometimes get 3995 microseconds instead of 4+ milliseconds.
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// 200 microseconds should largely account for this discrepancy.
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return (microsecs + 200) ~/ 1000;
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}
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main() {
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test("stream-periodic4", () {
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Stream stream =
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new Stream.periodic(const Duration(milliseconds: 5), (x) => x);
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Stopwatch watch = new Stopwatch()..start();
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var subscription;
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subscription = stream.take(10).listen((i) {
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int ms = watchMs(watch);
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watch.reset();
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if (i == 2) {
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Stopwatch watch2 = new Stopwatch()..start();
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// Busy wait.
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while (watch2.elapsedMilliseconds < 15) {}
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// Make sure the stream can be paused when it has overdue events.
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// We just busy waited for 15ms, even though the stream is supposed to
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// emit events every 5ms.
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subscription.pause();
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watch.stop();
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new Timer(const Duration(milliseconds: 150), () {
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watch.start();
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subscription.resume();
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});
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}
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}, onDone: expectAsync(() {}));
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});
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}
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