/**
                             * ShouldFail is subclass of AssertionError that is thrown whenever
                             * a test was expected to fail but did not.
                             *
                             * @param {String} message The message to display when the error occurs.
                             * @namespace Test
                             * @extends YUITest.AssertionError
                             * @module test
                             * @class ShouldFail
                             * @constructor
                             */
                            YUITest.ShouldFail = function (message){
                            
                                //call superclass
                                YUITest.AssertionError.call(this, message || "This test should fail but didn't.");
                            
                                /**
                                 * The name of the error that occurred.
                                 * @type String
                                 * @property name
                                 */
                                this.name = "ShouldFail";
                            
                            };
                            
                            //inherit from YUITest.AssertionError
                            YUITest.ShouldFail.prototype = new YUITest.AssertionError();
                            
                            //restore constructor
                            YUITest.ShouldFail.prototype.constructor = YUITest.ShouldFail;