File: test/js/AssertionError.js

            /**
             * 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();
                }
            
            };