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Side by Side Diff: tests/lib_strong/async/zone_register_callback_test.dart

Issue 2802973005: Migrate async tests to strong (Closed)
Patch Set: Created 3 years, 8 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 import 'package:expect/expect.dart';
6 import 'package:async_helper/async_helper.dart';
7 import 'dart:async';
8
9 main() {
10 Completer done = new Completer();
11
12 var valueToCapture;
13 var restoredValue;
14
15 Expect.identical(Zone.ROOT, Zone.current);
16 Zone forked = Zone.current.fork(specification: new ZoneSpecification(
17 registerCallback: (Zone self, ZoneDelegate parent, Zone origin, f()) {
18 // The zone is still the same as when origin.run was invoked, which
19 // is the root zone. (The origin zone hasn't been set yet).
20 Expect.identical(Zone.current, Zone.ROOT);
21 // Note that not forwarding is completely legal, though not encouraged.
22 var capturedValue = valueToCapture;
23 return parent.registerCallback(origin, () {
24 restoredValue = capturedValue;
25 return f();
26 });
27 }));
28
29 valueToCapture = 499;
30 var fun = () => 99;
31 var registered = forked.registerCallback(fun);
32 Expect.isFalse(identical(fun, registered));
33
34 // It is legal to invoke the callback in a different zone. This is, of course,
35 // extremely discouraged.
36 var result = registered();
37 Expect.equals(99, result);
38 Expect.equals(499, restoredValue);
39 }
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