JSTests/test262/test/built-ins/Object/prototype/valueOf/S15.2.4.4_A1_T5.js

// Copyright 2009 the Sputnik authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
info: The valueOf method returns its "this" value
es5id: 15.2.4.4_A1_T5
description: "\"this\" value is \"null\""
---*/

//CHECK#1
if (typeof Object.prototype.valueOf !== "function") {
  $ERROR('#1: valueOf method defined');
}

var obj = new Object(null);

//CHECK#2
if (typeof obj.valueOf !== "function") {
  $ERROR('#2: valueOf method accessed');
}

//CHECK#3
if (obj.valueOf() !== obj) {
  $ERROR('#3: The valueOf method returns its this value');
}