JSTests/test262/test/language/expressions/compound-assignment/S11.13.2_A4.5_T2.9.js

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

/*---
info: The production x -= y is the same as x = x - y
es5id: 11.13.2_A4.5_T2.9
description: >
    Type(x) is different from Type(y) and both types vary between
    Boolean (primitive or object) and Null
---*/

var x;

//CHECK#1
x = true;
x -= null;
if (x !== 1) {
  $ERROR('#1: x = true; x -= null; x === 1. Actual: ' + (x));
}

//CHECK#2
x = null;
x -= true;
if (x !== -1) {
  $ERROR('#2: x = null; x -= true; x === -1. Actual: ' + (x));
}

//CHECK#3
x = new Boolean(true);
x -= null;
if (x !== 1) {
  $ERROR('#3: x = new Boolean(true); x -= null; x === 1. Actual: ' + (x));
}

//CHECK#4
x = null;
x -= new Boolean(true);
if (x !== -1) {
  $ERROR('#4: x = null; x -= new Boolean(true); x === -1. Actual: ' + (x));
}