blob: d09e636af8d013ddc769e00fe2489ee38ecc0cb8 [file] [log] [blame]
// Copyright (c) 2011, 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.
library timer_test;
import 'dart:async';
import 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
const ms = const Duration(milliseconds: 1);
expectGTE(min, actual, msg) {
if (actual >= min) return;
Expect.fail(msg.replaceAll('{0}', "$min").replaceAll('{1}', "$actual"));
}
main() {
int interval = 20;
asyncStart();
var sw = new Stopwatch()..start();
int nextTick = 1;
new Timer.periodic(ms * interval, (t) {
expectGTE(nextTick, t.tick, "tick {1} before expect next tick {0}.");
int time = sw.elapsedMilliseconds;
int minTime = interval * t.tick;
expectGTE(minTime, time, "Actual time {1} before {0} at tick ${t.tick}");
while (sw.elapsedMilliseconds < time + 3 * interval) {
// idle.
}
nextTick = t.tick + 2; // At least increment by two, probably more.
if (t.tick > 20) {
t.cancel();
asyncEnd();
}
});
}