Robert Nystrom
d3904f5a54
Change-Id: I6ccbe1494165c2bda142ece13584c4738e3b43e6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/425347 Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
47 lines
1.4 KiB
Dart
47 lines
1.4 KiB
Dart
// Copyright (c) 2012, 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_repeat_test;
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import 'dart:async';
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import 'package:expect/expect.dart';
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const Duration TIMEOUT = const Duration(milliseconds: 500);
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const int ITERATIONS = 5;
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late Timer timer;
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Stopwatch stopwatch = new Stopwatch();
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int iteration = 0;
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// Some browsers (Firefox and IE so far) can trigger too early. Add a safety
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// margin. We use identical(1, 1.0) as an easy way to know if the test is
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// compiled by dart2js.
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int get safetyMargin => identical(1, 1.0) ? 100 : 0;
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var completer = new Completer();
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void timeoutHandler(Timer timer) {
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iteration++;
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Expect.isTrue(iteration <= ITERATIONS);
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if (iteration == ITERATIONS) {
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// When we are done with all of the iterations, we expect a
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// certain amount of time to have passed. Checking the time on
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// each iteration doesn't work because the timeoutHandler runs
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// concurrently with the periodic timer.
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Expect.isTrue(
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stopwatch.elapsedMilliseconds + safetyMargin >=
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ITERATIONS * TIMEOUT.inMilliseconds,
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);
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timer.cancel();
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completer.complete();
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}
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}
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main() {
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stopwatch.start();
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timer = new Timer.periodic(TIMEOUT, timeoutHandler);
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return completer.future;
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}
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