JSTests/test262/test/built-ins/Object/defineProperties/15.2.3.7-6-a-143.js

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

/*---
es5id: 15.2.3.7-6-a-143
description: >
    Object.defineProperties - '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 (15.4.5.1 step 3.c)
---*/

var arr = [];

Object.defineProperties(arr, {
  length: {
    value: {
      valueOf: function() {
        return 2;
      }
    }
  }
});

assert.sameValue(arr.length, 2, 'arr.length');