test262/test/language/expressions/subtraction/S11.6.2_A3_T2.3.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_T2.3
description: >
    Type(x) is different from Type(y) and both types vary between
    Number (primitive or object) and Null
---*/

//CHECK#1
if (1 - null !== 1) {
  throw new Test262Error('#1: 1 - null === 1. Actual: ' + (1 - null));
}

//CHECK#2
if (null - 1 !== -1) {
  throw new Test262Error('#2: null - 1 === -1. Actual: ' + (null - 1));
}

//CHECK#3
if (new Number(1) - null !== 1) {
  throw new Test262Error('#3: new Number(1) - null === 1. Actual: ' + (new Number(1) - null));
}

//CHECK#4
if (null - new Number(1) !== -1) {
  throw new Test262Error('#4: null - new Number(1) === -1. Actual: ' + (null - new Number(1)));
}