JSTests/test262/test/language/expressions/subtraction/S11.6.2_A4_T8.js

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

/*---
info: Operator x - y produces the same result as x + (-y)
es5id: 11.6.2_A4_T8
description: >
    If the magnitude is too large to represent, the operation
    overflows and the result is then an infinity of appropriate sign
---*/

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

//CHECK#2
if (-Number.MAX_VALUE - Number.MAX_VALUE !== Number.NEGATIVE_INFINITY) {
  $ERROR('#2: -Number.MAX_VALUE - umber.MAX_VALUE === Number.NEGATIVE_INFINITY. Actual: ' + (-Number.MAX_VALUE - Number.MAX_VALUE));
}

//CHECK#3
if (1e+308 - -1e+308 !== Number.POSITIVE_INFINITY) {
  $ERROR('#3: 1e+308 - -1e+308 === Number.POSITIVE_INFINITY. Actual: ' + (1e+308 - -1e+308));
}

//CHECK#4
if (-8.99e+307 - 8.99e+307 !== Number.NEGATIVE_INFINITY) {
  $ERROR('#4: -8.99e+307 - 8.99e+307 === Number.NEGATIVE_INFINITY. Actual: ' + (-8.99e+307 - 8.99e+307));
}