JSTests/test262/test/language/expressions/subtraction/S11.6.2_A3_T2.4.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 returns ToNumber(x) - ToNumber(y)
es5id: 11.6.2_A3_T2.4
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)));
}