JSTests/test262/test/built-ins/Object/defineProperty/15.2.3.6-4-148.js

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

/*---
es5id: 15.2.3.6-4-148
description: >
    Object.defineProperty - 'O' is an Array, 'name' is the length
    property of 'O', test the [[Value]] field of 'desc' is an Object
    which has an own valueOf method that returns an object and
    toString method that returns a string (15.4.5.1 step 3.c)
---*/

        var arrObj = [];
        var toStringAccessed = false;
        var valueOfAccessed = false;

        Object.defineProperty(arrObj, "length", {
            value: {
                toString: function () {
                    toStringAccessed = true;
                    return '2';
                },

                valueOf: function () {
                    valueOfAccessed = true;
                    return {};
                }
            }
        });

assert.sameValue(arrObj.length, 2, 'arrObj.length');
assert(toStringAccessed, 'toStringAccessed !== true');
assert(valueOfAccessed, 'valueOfAccessed !== true');