1// Copyright 2015 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// Flags: --harmony-proxies --harmony-reflect
6
7
8(function () {
9  // No trap.
10
11  var target = {};
12  var handler = {};
13  var proxy = new Proxy(target, handler);
14
15  assertTrue(Reflect.isExtensible(target));
16  assertTrue(Reflect.isExtensible(proxy));
17  assertTrue(Reflect.preventExtensions(proxy));
18  assertFalse(Reflect.isExtensible(target));
19  assertFalse(Reflect.isExtensible(proxy));
20})();
21
22
23(function () {
24  // "Undefined" trap.
25
26  var target = {};
27  var handler = { isExtensible: null };
28  var proxy = new Proxy(target, handler);
29
30  assertTrue(Reflect.isExtensible(target));
31  assertTrue(Reflect.isExtensible(proxy));
32  assertTrue(Reflect.preventExtensions(proxy));
33  assertFalse(Reflect.isExtensible(target));
34  assertFalse(Reflect.isExtensible(proxy));
35})();
36
37
38(function () {
39  // Invalid trap.
40
41  var target = {};
42  var handler = { isExtensible: true };
43  var proxy = new Proxy(target, handler);
44
45  assertThrows(() => {Reflect.isExtensible(proxy)}, TypeError);
46})();
47
48
49(function () {
50  var target = {};
51  var handler = { isExtensible() {return "bla"} };
52  var proxy = new Proxy(target, handler);
53
54  // Trap returns trueish and target is extensible.
55  assertTrue(Reflect.isExtensible(proxy));
56
57  // Trap returns trueish but target is not extensible.
58  Reflect.preventExtensions(target);
59  assertThrows(() => {Reflect.isExtensible(proxy)}, TypeError);
60})();
61
62
63(function () {
64  var target = {};
65  var handler = { isExtensible() {return 0} };
66  var proxy = new Proxy(target, handler);
67
68  // Trap returns falsish but target is extensible.
69  assertThrows(() => {Reflect.isExtensible(proxy)}, TypeError);
70
71  // Trap returns falsish and target is not extensible.
72  Reflect.preventExtensions(target);
73  assertFalse(Reflect.isExtensible(proxy));
74})();
75