JSTests/test262/test/built-ins/Object/defineProperty/15.2.3.6-4-149.js

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

/*---
es5id: 15.2.3.6-4-149
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 toString and valueOf method (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 3;
    }
  }
});

assert.sameValue(arrObj.length, 3, 'arrObj.length');
assert.sameValue(toStringAccessed, false, 'toStringAccessed');
assert(valueOfAccessed, 'valueOfAccessed !== true');