test/built-ins/Proxy/isExtensible/return-is-boolean.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 9.5.3
description: >
    The trap returns a boolean result.
---*/

var target = {};
var p = new Proxy(target, {
    isExtensible: function(t) {
        if ( Object.isExtensible(t) ) {
            return 1;
        } else {
            return 0;
        }
    }
});

assert.sameValue(Object.isExtensible(p), true);

Object.preventExtensions(target);

assert.sameValue(Object.isExtensible(p), false);