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.

 /**

  * If Type(Primitive(x)) is not String and Type(Primitive(y)) is not String, then operator x + y returns ToNumber(x) + ToNumber(y)

  *

  * @path ch11/11.6/11.6.1/S11.6.1_A3.1_T2.2.js

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

  */

 //CHECK#1

 if (1 + null !== 1) {

   $ERROR('#1: 1 + null === 1. Actual: ' + (1 + null));

 }

 //CHECK#2

 if (null + 1 !== 1) {

   $ERROR('#2: null + 1 === 1. Actual: ' + (null + 1));

 }

 //CHECK#3

 if (new Number(1) + null !== 1) {

   $ERROR('#3: new Number(1) + null === 1. Actual: ' + (new Number(1) + null));

 }

 //CHECK#4

 if (null + new Number(1) !== 1) {

   $ERROR('#4: null + new Number(1) === 1. Actual: ' + (null + new Number(1)));

 }