The Tor Browser / file revision

 // Copyright 2009 the Sputnik authors.  All rights reserved.

 // This code is governed by the BSD license found in the LICENSE file.

 /**

  * Operator x / y returns ToNumber(x) / ToNumber(y)

  *

  * @path ch11/11.5/11.5.2/S11.5.2_A3_T2.4.js

  * @description Type(x) is different from Type(y) and both types vary between Number (primitive or object) and Undefined

  */

 //CHECK#1

 if (isNaN(1 / undefined) !== true) {

   $ERROR('#1: 1 / undefined === Not-a-Number. Actual: ' + (1 / undefined));

 }

 //CHECK#2

 if (isNaN(undefined / 1) !== true) {

   $ERROR('#2: undefined / 1 === Not-a-Number. Actual: ' + (undefined / 1));

 }

 //CHECK#3

 if (isNaN(new Number(1) / undefined) !== true) {

   $ERROR('#3: new Number(1) / undefined === Not-a-Number. Actual: ' + (new Number(1) / undefined));

 }

 //CHECK#4

 if (isNaN(undefined / new Number(1)) !== true) {

   $ERROR('#4: undefined / new Number(1) === Not-a-Number. Actual: ' + (undefined / new Number(1)));

 }