JSTests/test262/test/built-ins/Array/prototype/map/15.4.4.19-8-b-16.js

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

/*---
esid: sec-array.prototype.map
es5id: 15.4.4.19-8-b-16
description: >
    Array.prototype.map - decreasing length of array does not delete
    non-configurable properties
flags: [noStrict]
---*/

        function callbackfn(val, idx, obj) {
            if (idx === 2 && val === "unconfigurable") {
                return false;
            } else {
                return true;
            }
        }

        var arr = [0, 1, 2];

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

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

        var testResult = arr.map(callbackfn);

assert.sameValue(testResult.length, 3, 'testResult.length');
assert.sameValue(testResult[2], false, 'testResult[2]');