test/suite/ch15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-a-14.js


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/// 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.
/**
 * @path ch15/15.4/15.4.4/15.4.4.15/15.4.4.15-8-a-14.js
 * @description Array.prototype.lastIndexOf -  deleting property of prototype causes prototype index property not to be visited on an Array
 */


function testcase() {

        var arr = [0, , 2];

        Object.defineProperty(arr, "20", {
            get: function () {
                delete Array.prototype[1];
                return 0;
            },
            configurable: true
        });

        try {
            Array.prototype[1] = 1;
            return -1 === arr.lastIndexOf(1);
        } finally {
            delete Array.prototype[1];
        }
    }
runTestCase(testcase);