JSTests/test262/test/built-ins/Object/defineProperty/15.2.3.6-4-275.js

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

/*---
es5id: 15.2.3.6-4-275
description: >
    Object.defineProperty - 'O' is an Array, 'name' is an array index
    named property, test the length property of 'O' is set as
    ToUint32('name') + 1 if ToUint32('name') equals to value of the
    length property in 'O' (15.4.5.1 step 4.e.ii)
---*/

var arrObj = [];
arrObj.length = 3; // default value of length: writable: true, configurable: false, enumerable: false

Object.defineProperty(arrObj, "3", {
  value: 3
});

assert.sameValue(arrObj.length, 4, 'arrObj.length');
assert.sameValue(arrObj[3], 3, 'arrObj[3]');