JSTests/test262/test/built-ins/String/prototype/concat/S15.5.4.6_A1_T6.js

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

/*---
info: String.prototype.concat([,[...]])
es5id: 15.5.4.6_A1_T6
description: >
    Call concat([,[...]]) function with x argument of new String
    object, where x is undefined variable
---*/

//////////////////////////////////////////////////////////////////////////////
//CHECK#1
//since ToString(undefined) evaluates to "undefined" concat(undefined) evaluates to concat("undefined")
if (new String("lego").concat(x) !== "legoundefined") {
  $ERROR('#1: var x; new String("lego").concat(x) === "legoundefined". Actual: ' + new String("lego").concat(x));
}
//
//////////////////////////////////////////////////////////////////////////////

var x;