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 /**
 * ComparisonFailure is subclass of Error that is thrown whenever
 * a comparison between two values fails. It provides mechanisms to retrieve
 * both the expected and actual value.
 *
 * @param {String} message The message to display when the error occurs.
 * @param {Object} expected The expected value.
 * @param {Object} actual The actual value that caused the assertion to fail.
 * @namespace Test
 * @extends AssertionError
 * @module test
 * @class ComparisonFailure
 * @constructor
 */
 YUITest.ComparisonFailure = function (message, expected, actual){
 
 //call superclass
 YUITest.AssertionError.call(this, message);
 
 /**
 * The expected value.
 * @type Object
 * @property expected
 */
 this.expected = expected;
 
 /**
 * The actual value.
 * @type Object
 * @property actual
 */
 this.actual = actual;
 
 /**
 * The name of the error that occurred.
 * @type String
 * @property name
 */
 this.name = "ComparisonFailure";
 
 };
 
 //inherit from YUITest.AssertionError
 YUITest.ComparisonFailure.prototype = new YUITest.AssertionError;
 
 //restore constructor
 YUITest.ComparisonFailure.prototype.constructor = YUITest.ComparisonFailure;
 
 /**
 * 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.ComparisonFailure.prototype.getMessage = function(){
 return this.message + "\nExpected: " + this.expected + " (" + (typeof this.expected) + ")" +
 "\nActual: " + this.actual + " (" + (typeof this.actual) + ")";
 };