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// 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.
// @dart = 2.9
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;
bool running = true;
var timer = new Timer.periodic(ms * interval, (t) {
expectGTE(nextTick, t.tick, "tick {1} before expect next tick {0}.");
nextTick += 1;
int time = sw.elapsedMilliseconds;
int minTime = interval * t.tick;
expectGTE(minTime, time, "Actual time {1} before {0} at tick ${t.tick}");
if (t.tick > 20) {
running = false;
t.cancel();
asyncEnd();
}
});
/// Test that ticks still happen when the rest of the system is slow.
delay() {
int time = new DateTime.now().millisecondsSinceEpoch;
int limit = time + 3 * interval;
while (new DateTime.now().millisecondsSinceEpoch < limit) {
// Idle.
}
nextTick = timer.tick + 2; // At least increment by two, probably more.
if (running) Timer.run(delay);
}
Timer.run(delay);
}