tests/lib/async/zone_create_periodic_timer_test.dart

// Copyright (c) 2013, 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.

import 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
import 'dart:async';

main() {
  Completer done = new Completer();
  List events = [];

  Expect.identical(Zone.ROOT, Zone.current);
  Zone forked;
  forked = Zone.current.fork(specification: new ZoneSpecification(
      createPeriodicTimer: (Zone self, ZoneDelegate parent, Zone origin,
                            Duration period, f(Timer timer)) {
        events.add("forked.createPeriodicTimer");
        return parent.createPeriodicTimer(origin, period, (Timer timer) {
          events.add("wrapped function ${period.inMilliseconds}");
          f(timer);
        });
      }));

  asyncStart();
  int tickCount = 0;
  forked.run(() {
    new Timer.periodic(const Duration(milliseconds: 5),
        (Timer timer) {
      events.add("periodic Timer $tickCount");
      Expect.identical(forked, Zone.current);
      tickCount++;
      if (tickCount == 4) {
        timer.cancel();
        // Allow some time in case the cancel didn't work.
        new Timer(const Duration(milliseconds: 20), done.complete);
      }
    });
  });

  Expect.identical(Zone.ROOT, Zone.current);
  events.add("after createPeriodicTimer");

  done.future.whenComplete(() {
    Expect.listEquals(
      [ "forked.createPeriodicTimer", "after createPeriodicTimer",
        "wrapped function 5", "periodic Timer 0",
        "wrapped function 5", "periodic Timer 1",
        "wrapped function 5", "periodic Timer 2",
        "wrapped function 5", "periodic Timer 3" ],
      events);
    asyncEnd();
  });
}