The Tor Browser: js/src/tests/test262/ch11/11.6/11.6.2/S11.6.2_A4

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

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

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

     4 /**

     5  * Operator x - y produces the same result as x + (-y)

     6  *

     7  * @path ch11/11.6/11.6.2/S11.6.2_A4_T3.js

     8  * @description The difference of two infinities of the same sign is NaN

     9  */

    11 //CHECK#1

    12 if (isNaN(Number.POSITIVE_INFINITY - Number.POSITIVE_INFINITY) !== true ) {

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

    14 }

    16 //CHECK#2

    17 if (isNaN(Number.NEGATIVE_INFINITY - Number.NEGATIVE_INFINITY) !== true ) {

    18   $ERROR('#2: -Infinity - -Infinity === Not-a-Number. Actual: ' + (-Infinity - -Infinity));

    19 }

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