JSTests/test262/test/language/expressions/compound-assignment/S11.13.2_A4.6_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: The production x <<= y is the same as x = x << y
es5id: 11.13.2_A4.6_T2.6
description: >
    Type(x) is different from Type(y) and both types vary between
    String (primitive or object) and Undefined
---*/

var x;

//CHECK#1
x = "1";
x <<= undefined;
if (x !== 1) {
  $ERROR('#1: x = "1"; x <<= undefined; x === 1. Actual: ' + (x));
}

//CHECK#2
x = undefined;
x <<= "1";
if (x !== 0) {
  $ERROR('#2: x = undefined; x <<= "1"; x === 0. Actual: ' + (x));
}

//CHECK#3
x = new String("1");
x <<= undefined;
if (x !== 1) {
  $ERROR('#3: x = new String("1"); x <<= undefined; x === 1. Actual: ' + (x));
}

//CHECK#4
x = undefined;
x <<= new String("1");
if (x !== 0) {
  $ERROR('#4: x = undefined; x <<= new String("1"); x === 0. Actual: ' + (x));
}