Robert Nystrom
a2b556b937
Change-Id: Ia5c41dda6503e1fbb8cc6099835d07588425e2ba Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128310 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
50 lines
1.4 KiB
Dart
50 lines
1.4 KiB
Dart
// Copyright (c) 2011, 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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library timer_test;
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import 'dart:async';
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import 'package:expect/expect.dart';
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import 'package:async_helper/async_helper.dart';
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const ms = const Duration(milliseconds: 1);
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expectGTE(min, actual, msg) {
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if (actual >= min) return;
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Expect.fail(msg.replaceAll('{0}', "$min").replaceAll('{1}', "$actual"));
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}
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main() {
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int interval = 20;
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asyncStart();
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var sw = new Stopwatch()..start();
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int nextTick = 1;
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bool running = true;
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var timer = new Timer.periodic(ms * interval, (t) {
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expectGTE(nextTick, t.tick, "tick {1} before expect next tick {0}.");
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nextTick += 1;
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int time = sw.elapsedMilliseconds;
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int minTime = interval * t.tick;
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expectGTE(minTime, time, "Actual time {1} before {0} at tick ${t.tick}");
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if (t.tick > 20) {
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running = false;
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t.cancel();
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asyncEnd();
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}
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});
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/// Test that ticks still happen when the rest of the system is slow.
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delay() {
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int time = new DateTime.now().millisecondsSinceEpoch;
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int limit = time + 3 * interval;
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while (new DateTime.now().millisecondsSinceEpoch < limit) {
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// Idle.
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}
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nextTick = timer.tick + 2; // At least increment by two, probably more.
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if (running) Timer.run(delay);
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}
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Timer.run(delay);
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}
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