test262/test/built-ins/Object/preventExtensions/15.2.3.10-3-18.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// Ecma International makes this code available under the terms and conditions set
// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the
// "Use Terms").   Any redistribution of this code must retain the above
// copyright and this notice and otherwise comply with the Use Terms.

/*---
es5id: 15.2.3.10-3-18
description: >
    Object.preventExtensions - named properties cannot be added into a
    Date object
includes: [propertyHelper.js]
---*/

var obj = new Date();

assert(Object.isExtensible(obj));
Object.preventExtensions(obj);
assert(!Object.isExtensible(obj));

verifyNotWritable(obj, "exName", "nocheck");

assert(!obj.hasOwnProperty("exName"));