test/built-ins/Object/defineProperty/15.2.3.6-4-171.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: 15.2.3.6-4-171
description: >
    Object.defineProperty - 'O' is an Array, 'name' is the length
    property of 'O', the [[Value]] field of 'desc' is less than value
    of  the length property, test the [[Configurable]] attribute of an
    inherited data property with large index named in 'O' can't stop
    deleting index named properties (15.4.5.1 step 3.l.ii)
includes: [runTestCase.js]
---*/

function testcase() {

        var arrObj = [0, 1];
        try {
            Array.prototype[1] = 2; // Not setting the [[Configurable]] attribute of property "1" to false here, since Array.prototype is a global object, and non-configurbale property can't revert to configurable
            Object.defineProperty(arrObj, "length", {
                value: 1
            });
            return arrObj.length === 1 && !arrObj.hasOwnProperty("1");
        } finally {
            delete Array.prototype[1];
        }
    }
runTestCase(testcase);