JSTests/test262/test/built-ins/Object/isFrozen/15.2.3.12-2-a-2.js

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

/*---
es5id: 15.2.3.12-2-a-2
description: >
    Object.isFrozen - 'P' is own data property that overrides an
    inherited data property
---*/

var proto = {};

Object.defineProperty(proto, "foo", {
  value: 9,
  writable: false,
  configurable: false
});

var Con = function() {};
Con.prototype = proto;
var child = new Con();

Object.defineProperty(child, "foo", {
  value: 12,
  writable: true,
  configurable: false
});

Object.preventExtensions(child);

assert.sameValue(Object.isFrozen(child), false, 'Object.isFrozen(child)');