tests/lib/async/multiple_timer_test.dart

// 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.

library multiple_timer_test;

import 'dart:async';
import '../../../pkg/unittest/lib/unittest.dart';

const Duration TIMEOUT1 = const Duration(seconds: 1);
const Duration TIMEOUT2 = const Duration(seconds: 2);
const Duration TIMEOUT3 = const Duration(milliseconds: 500);
const Duration TIMEOUT4 = const Duration(milliseconds: 1500);

// The stopwatch is more precise than the Timer. It can happen that
// the TIMEOUT triggers *slightly* too early on the VM. So we add a millisecond
// as safetymargin.
// Some browsers (Firefox and IE so far) can trigger too early. So we add more
// 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 : 1;

main() {
  test("multiple timer test", () {
    Stopwatch _stopwatch1 = new Stopwatch();
    Stopwatch _stopwatch2 = new Stopwatch();
    Stopwatch _stopwatch3 = new Stopwatch();
    Stopwatch _stopwatch4 = new Stopwatch();
    List<int> _order;
    int _message;

    void timeoutHandler1() {
      expect(_stopwatch1.elapsedMilliseconds + safetyMargin,
             greaterThanOrEqualTo(TIMEOUT1.inMilliseconds));
      expect(_order[_message], 0);
      _message++;
    }

    void timeoutHandler2() {
      expect(_stopwatch2.elapsedMilliseconds + safetyMargin,
             greaterThanOrEqualTo(TIMEOUT2.inMilliseconds));
      expect(_order[_message], 1);
      _message++;
    }

    void timeoutHandler3() {
      expect(_stopwatch3.elapsedMilliseconds + safetyMargin,
             greaterThanOrEqualTo(TIMEOUT3.inMilliseconds));
      expect(_order[_message], 2);
      _message++;
    }

    void timeoutHandler4() {
      expect(_stopwatch4.elapsedMilliseconds + safetyMargin,
             greaterThanOrEqualTo(TIMEOUT4.inMilliseconds));
      expect(_order[_message], 3);
      _message++;
    }

    _order = new List<int>(4);
    _order[0] = 2;
    _order[1] = 0;
    _order[2] = 3;
    _order[3] = 1;
    _message = 0;

    _stopwatch1.start();
    new Timer(TIMEOUT1, expectAsync0(timeoutHandler1));
    _stopwatch2.start();
    new Timer(TIMEOUT2, expectAsync0(timeoutHandler2));
    _stopwatch3.start();
    new Timer(TIMEOUT3, expectAsync0(timeoutHandler3));
    _stopwatch4.start();
    new Timer(TIMEOUT4, expectAsync0(timeoutHandler4));
  });
}