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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 library timer_test; |
| 6 |
| 7 import 'dart:async'; |
| 8 import 'package:expect/expect.dart'; |
| 9 import 'package:async_helper/async_helper.dart'; |
| 10 |
| 11 const ms = const Duration(milliseconds: 1); |
| 12 |
| 13 expectGTE(min, actual, msg) { |
| 14 if (actual >= min) return; |
| 15 Expect._fail(msg.replaceAll('{0}', "$min").replaceAll('{1}', "$actual")); |
| 16 } |
| 17 |
| 18 main() { |
| 19 int interval = 20; |
| 20 asyncStart(); |
| 21 var sw = new Stopwatch()..start(); |
| 22 int nextTick = 1; |
| 23 new Timer.periodic(ms * interval, (t) { |
| 24 expectGTE(nextTick, t.tick, "tick {1} before expect next tick {0}."); |
| 25 int time = sw.elapsedMilliseconds; |
| 26 int minTime = interval * t.tick; |
| 27 expectGTE(minTime, time, "Actual time {1} before {0} at tick ${t.tick}"); |
| 28 while (sw.elapsedMilliseconds < time + 3 * interval) { |
| 29 // idle. |
| 30 } |
| 31 nextTick = t.tick + 2; // At least increment by two, probably more. |
| 32 if (t.tick > 20) { |
| 33 t.cancel(); |
| 34 asyncEnd(); |
| 35 } |
| 36 }); |
| 37 } |
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