/**
                             * UnexpectedValue is subclass of Error that is thrown whenever
                             * a value was unexpected in its scope. This typically means that a test
                             * was performed to determine that a value was *not* equal to a certain
                             * value.
                             *
                             * @param {String} message The message to display when the error occurs.
                             * @param {Object} unexpected The unexpected value.
                             * @namespace Test
                             * @extends AssertionError
                             * @module test
                             * @class UnexpectedValue
                             * @constructor
                             */
                            YUITest.UnexpectedValue = function (message, unexpected){
                            
                                //call superclass
                                YUITest.AssertionError.call(this, message);
                            
                                /**
                                 * The unexpected value.
                                 * @type Object
                                 * @property unexpected
                                 */
                                this.unexpected = unexpected;
                            
                                /**
                                 * The name of the error that occurred.
                                 * @type String
                                 * @property name
                                 */
                                this.name = "UnexpectedValue";
                            
                            };
                            
                            //inherit from YUITest.AssertionError
                            YUITest.UnexpectedValue.prototype = new YUITest.AssertionError();
                            
                            //restore constructor
                            YUITest.UnexpectedValue.prototype.constructor = YUITest.UnexpectedValue;
                            
                            /**
                             * Returns a fully formatted error for an assertion failure. This message
                             * provides information about the expected and actual values.
                             * @method getMessage
                             * @return {String} A string describing the error.
                             */
                            YUITest.UnexpectedValue.prototype.getMessage = function(){
                                return this.message + "\nUnexpected: " + this.unexpected + " (" + (typeof this.unexpected) + ") ";
                            };