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// 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 = [];
bool shouldForward = true;
Expect.identical(Zone.ROOT, Zone.current);
Zone forked = Zone.current.fork(specification: new ZoneSpecification(
runUnary: (Zone self, ZoneDelegate parent, Zone origin, f(arg), arg) {
// The zone is still the same as when was invoked, which
// is the root zone. (The origin zone hasn't been set yet).
Expect.identical(Zone.current, Zone.ROOT);
if (shouldForward) return parent.runUnary(origin, f, arg + 1);
return 42;
events.add("zone forked");
Zone expectedZone = forked;
var result = forked.runUnary((arg) {
Expect.identical(expectedZone, Zone.current);
events.add("run closure");
return arg + 3;
}, 495);
Expect.equals(499, result);
events.add("executed run");
shouldForward = false;
result = forked.runUnary((arg) {"should not be invoked");
}, 99);
Expect.equals(42, result);
events.add("executed run2");
shouldForward = true;
result = forked.runUnary((arg) {
Expect.identical(forked, Zone.current);
events.add("run closure 2");
scheduleMicrotask(() {
events.add("run closure 3");
Expect.identical(forked, Zone.current);
return -arg - 8;
}, 490);
events.add("after nested scheduleMicrotask");
Expect.equals(-499, result);
done.future.whenComplete(() {
["zone forked", "forked.run1", "run closure", "executed run",
"forked.run1", "executed run2", "forked.run1", "run closure 2",
"after nested scheduleMicrotask", "run closure 3"],