src/third_party/mozjs-45/js/src/tests/test262/ch11/11.6/11.6.2/S11.6.2_A4_T5.js

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

/**
 * Operator x - y produces the same result as x + (-y)
 *
 * @path ch11/11.6/11.6.2/S11.6.2_A4_T5.js
 * @description Using the rule of sum of two zeroes and the fact that a - b = a + (-b)
 */

//CHECK#1
if (-0 - -0 !== 0 ) {  
  $ERROR('#1.1: -0 - -0 === 0. Actual: ' + (-0 - -0));
} else {
  if (1 / (-0 - -0) !== Number.POSITIVE_INFINITY) {
    $ERROR('#1.2: -0 - -0 === + 0. Actual: -0');
  }
}

//CHECK#2
if (0 - -0 !== 0 ) {  
  $ERROR('#2.1: 0 - -0 === 0. Actual: ' + (0 - -0));
} else {
  if (1 / (0 - -0) !== Number.POSITIVE_INFINITY) {
    $ERROR('#2.2: 0 - -0 === + 0. Actual: -0');
  }
}

//CHECK#3
if (-0 - 0 !== -0 ) {  
  $ERROR('#3.1: -0 - 0 === 0. Actual: ' + (-0 - 0));
} else {
  if (1 / (-0 - 0) !== Number.NEGATIVE_INFINITY) {
    $ERROR('#3.2: -0 - 0 === - 0. Actual: +0');
  }
}

//CHECK#4
if (0 - 0 !== 0 ) {  
  $ERROR('#4.1: 0 - 0 === 0. Actual: ' + (0 - 0));
} else {
  if (1 / (0 - 0) !== Number.POSITIVE_INFINITY) {
    $ERROR('#4.2: 0 - 0 === + 0. Actual: -0');
  }
}