JSTests/test262/test/built-ins/Object/isExtensible/15.2.3.13-2-27.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es5id: 15.2.3.13-2-27
description: >
    Object.isExtensible returns false if O is not extensible and has a
    prototype that is not extensible
---*/

        var proto = {};
        Object.preventExtensions(proto);

        var ConstructFun = function () { };
        ConstructFun.prototype = proto;

        var obj = new ConstructFun();
        Object.preventExtensions(obj);

assert.sameValue(Object.isExtensible(obj), false, 'Object.isExtensible(obj)');