/**
                             * Error is thrown whenever an assertion fails. It provides methods
                             * to more easily get at error information and also provides a base class
                             * from which more specific assertion errors can be derived.
                             *
                             * @param {String} message The message to display when the error occurs.
                             * @namespace Test
                             * @module test
                             * @class AssertionError
                             * @constructor
                             */
                            YUITest.AssertionError = function (message){
                            
                                /**
                                 * Error message. Must be duplicated to ensure browser receives it.
                                 * @type String
                                 * @property message
                                 */
                                this.message = message;
                            
                                /**
                                 * The name of the error that occurred.
                                 * @type String
                                 * @property name
                                 */
                                this.name = "Assert Error";
                            };
                            
                            YUITest.AssertionError.prototype = {
                            
                                //restore constructor
                                constructor: YUITest.AssertionError,
                            
                                /**
                                 * Returns a fully formatted error for an assertion failure. This should
                                 * be overridden by all subclasses to provide specific information.
                                 * @method getMessage
                                 * @return {String} A string describing the error.
                                 */
                                getMessage : function () {
                                    return this.message;
                                },
                            
                                /**
                                 * Returns a string representation of the error.
                                 * @method toString
                                 * @return {String} A string representation of the error.
                                 */
                                toString : function () {
                                    return this.name + ": " + this.getMessage();
                                }
                            
                            };