File: test/js/UnexpectedValue.js

            /**
             * 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) + ") ";
            };