test/built-ins/Object/defineProperty/15.2.3.6-4-410.js


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

/*---
es5id: 15.2.3.6-4-410
description: >
    ES5 Attributes - Failed to add a property to an object when the
    object's prototype has a property with the same name and
    [[Writable]] set to false (JSON)
includes: [propertyHelper.js]
---*/

try {
    Object.defineProperty(Object.prototype, "prop", {
        value: 1001,
        writable: false,
        enumerable: false,
        configurable: true
    });

    assert(!JSON.hasOwnProperty("prop"));
    verifyNotWritable(JSON, "prop", "noCheckOwnProp");
    assert.sameValue(JSON.prop, 1001);

} finally {
    delete Object.prototype.prop;
}