# Yahoo! UI Library

### test 3.0.0

Yahoo! UI Library > test > ObjectAssert.js (source view)
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        /**
         * The ObjectAssert object provides functions to test JavaScript objects
         * for a variety of cases.
         *
         * @class ObjectAssert
         * @static
         */
        Y.ObjectAssert = {

            areEqual: function(expected, actual, message) {
                Y.Assert._increment();
                Y.Object.each(expected, function(value, name){
                    if (expected[name] != actual[name]){
                        throw new Y.Assert.ComparisonFailure(Y.Assert._formatMessage(message, "Values should be equal for property " + name), expected[name], actual[name]);
                    }
                });
            },

            /**
             * Asserts that an object has a property with the given name.
             * @param {String} propertyName The name of the property to test.
             * @param {Object} object The object to search.
             * @param {String} message (Optional) The message to display if the assertion fails.
             * @method hasKey
             * @static
             */
            hasKey: function (propertyName, object, message) {
                Y.Assert._increment();
                if (!Y.Object.hasKey(object, propertyName)){
                    Y.fail(Y.Assert._formatMessage(message, "Property '" + propertyName + "' not found on object."));
                }
            },

            /**
             * Asserts that an object has all properties of a reference object.
             * @param {Array} properties An array of property names that should be on the object.
             * @param {Object} object The object to search.
             * @param {String} message (Optional) The message to display if the assertion fails.
             * @method hasKeys
             * @static
             */
            hasKeys: function (properties, object, message) {
                Y.Assert._increment();
                for (var i=0; i < properties.length; i++){
                    if (!Y.Object.hasKey(object, properties[i])){
                        Y.fail(Y.Assert._formatMessage(message, "Property '" + properties[i] + "' not found on object."));
                    }
                }
            },

            /**
             * Asserts that a property with the given name exists on an object instance (not on its prototype).
             * @param {String} propertyName The name of the property to test.
             * @param {Object} object The object to search.
             * @param {String} message (Optional) The message to display if the assertion fails.
             * @method ownsKey
             * @static
             */
            ownsKey: function (propertyName, object, message) {
                Y.Assert._increment();
                if (!object.hasOwnProperty(propertyName)){
                    Y.fail(Y.Assert._formatMessage(message, "Property '" + propertyName + "' not found on object instance."));
                }
            },

            /**
             * Asserts that all properties exist on an object instance (not on its prototype).
             * @param {Array} properties An array of property names that should be on the object.
             * @param {Object} object The object to search.
             * @param {String} message (Optional) The message to display if the assertion fails.
             * @method ownsKeys
             * @static
             */
            ownsKeys: function (properties, object, message) {
                Y.Assert._increment();
                for (var i=0; i < properties.length; i++){
                    if (!object.hasOwnProperty(properties[i])){
                        Y.fail(Y.Assert._formatMessage(message, "Property '" + properties[i] + "' not found on object instance."));
                    }
                }
            },

            /**
             * Asserts that an object owns no properties.
             * @param {Object} object The object to check.
             * @param {String} message (Optional) The message to display if the assertion fails.
             * @method ownsNoKeys
             * @static
             */
            ownsNoKeys : function (object, message) {
                Y.Assert._increment();

                var keys = Y.Object.keys(object);

                if (keys.length > 0){
                    Y.fail(Y.Assert._formatMessage(message, "Object owns " + keys.length + " properties but should own none."));
                }

            }
        };

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