test262/test/suite/ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-9-b-29.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.
/**
 * @path ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-9-b-29.js
 * @description Array.prototype.reduce - decreasing length of array does not delete non-configurable properties
 */


function testcase() {

        var testResult = false;

        function callbackfn(accum, val, idx, obj) {
            if (idx === 2 && val === "unconfigurable") {
                testResult = true;
            }
        }

        var arr = [0, 1, 2, 3];

        Object.defineProperty(arr, "2", {
            get: function () {
                return "unconfigurable";
            },
            configurable: false
        });

        Object.defineProperty(arr, "0", {
            get: function () {
                arr.length = 2;
                return 1;
            },
            configurable: true
        });

        arr.reduce(callbackfn, "initialValue");

        return testResult;
    }
runTestCase(testcase);