JSTests/test262/test/language/expressions/subtraction/S11.6.2_A3_T2.8.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_T2.8
description: >
    Type(x) is different from Type(y) and both types vary between
    Boolean (primitive or object) and Undefined
---*/

//CHECK#1
if (isNaN(true - undefined) !== true) {
  $ERROR('#1: true - undefined === Not-a-Number. Actual: ' + (true - undefined));
}

//CHECK#2
if (isNaN(undefined - true) !== true) {
  $ERROR('#2: undefined - true === Not-a-Number. Actual: ' + (undefined - true));
}

//CHECK#3
if (isNaN(new Boolean(true) - undefined) !== true) {
  $ERROR('#3: new Boolean(true) - undefined === Not-a-Number. Actual: ' + (new Boolean(true) - undefined));
}

//CHECK#4
if (isNaN(undefined - new Boolean(true)) !== true) {
  $ERROR('#4: undefined - new Boolean(true) === Not-a-Number. Actual: ' + (undefined - new Boolean(true)));
}