File: test/js/UnexpectedError.js

            /**
             * UnexpectedError is subclass of AssertionError that is thrown whenever
             * an error occurs within the course of a test and the test was not expected
             * to throw an error.
             *
             * @param {Error} cause The unexpected error that caused this error to be
             *                      thrown.
             * @namespace Test
             * @extends YUITest.AssertionError
             * @module test
             * @class UnexpectedError
             * @constructor
             */
            YUITest.UnexpectedError = function (cause){
            
                //call superclass
                YUITest.AssertionError.call(this, "Unexpected error: " + cause.message);
            
                /**
                 * The unexpected error that occurred.
                 * @type Error
                 * @property cause
                 */
                this.cause = cause;
            
                /**
                 * The name of the error that occurred.
                 * @type String
                 * @property name
                 */
                this.name = "UnexpectedError";
            
                /**
                 * Stack information for the error (if provided).
                 * @type String
                 * @property stack
                 */
                this.stack = cause.stack;
            
            };
            
            //inherit from YUITest.AssertionError
            YUITest.UnexpectedError.prototype = new YUITest.AssertionError();
            
            //restore constructor
            YUITest.UnexpectedError.prototype.constructor = YUITest.UnexpectedError;