test262/test/built-ins/Object/defineProperty/15.2.3.6-4-405.js

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

/*---
es5id: 15.2.3.6-4-405
description: >
    ES5 Attributes - Failed to add a property to an object when the
    object's object has a property with same name and [[Writable]]
    attribute is set to false (Number instance)
includes: [propertyHelper.js]
---*/

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

    assert(!numObj.hasOwnProperty("prop"));
    verifyNotWritable(numObj, "prop", "noCheckOwnProp");
} finally {
    delete Number.prototype.prop;
}