JSTests/test262/test/language/expressions/subtraction/S11.6.2_A3_T2.6.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_T2.6
description: >
    Type(x) is different from Type(y) and both types vary between
    String (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 String("1") - undefined) !== true) {
  $ERROR('#3: new String("1") - undefined === Not-a-Number. Actual: ' + (new String("1") - undefined));
}

//CHECK#4
if (isNaN(undefined - new String("1")) !== true) {
  $ERROR('#4: undefined - new String("1") === Not-a-Number. Actual: ' + (undefined - new String("1")));
}