| // Copyright (c) 2012, 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 |
| |
| library timer_repeat_test; |
| |
| import 'dart:async'; |
| |
| import 'package:expect/expect.dart'; |
| |
| const Duration TIMEOUT = const Duration(milliseconds: 500); |
| const int ITERATIONS = 5; |
| |
| Timer timer; |
| Stopwatch stopwatch = new Stopwatch(); |
| int iteration; |
| |
| // Some browsers (Firefox and IE so far) can trigger too early. Add a safety |
| // margin. We use identical(1, 1.0) as an easy way to know if the test is |
| // compiled by dart2js. |
| int get safetyMargin => identical(1, 1.0) ? 100 : 0; |
| |
| var completer = new Completer(); |
| |
| void timeoutHandler(Timer timer) { |
| iteration++; |
| Expect.isTrue(iteration <= ITERATIONS); |
| if (iteration == ITERATIONS) { |
| // When we are done with all of the iterations, we expect a |
| // certain amount of time to have passed. Checking the time on |
| // each iteration doesn't work because the timeoutHandler runs |
| // concurrently with the periodic timer. |
| Expect.isTrue(stopwatch.elapsedMilliseconds + safetyMargin >= |
| ITERATIONS * TIMEOUT.inMilliseconds); |
| timer.cancel(); |
| completer.complete(); |
| } |
| } |
| |
| main() { |
| iteration = 0; |
| stopwatch.start(); |
| timer = new Timer.periodic(TIMEOUT, timeoutHandler); |
| return completer.future; |
| } |