JSTests/test262/test/built-ins/Function/prototype/toString/S15.3.4.2_A16.js

// Copyright 2011 the Sputnik authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
info: |
    The toString function is not generic; it throws a TypeError exception if
    its this value is not a callable object.
es5id: 15.3.4.2_A16
description: >
    The String constructor, given an object, should invoke that
    object's toString method as a method, i.e., with its this value
    bound to that object.
---*/

var obj = {toString: Function.prototype.toString};

assert.throws(TypeError, function() {
  String(obj);
}, 'String(obj) throws a TypeError exception');