Added isMouseEvent() unit test to verify focus event

Related to issue #158.

Author: stevenbenner

test/unit/utility.js

@@ -14,10 +14,12 @@ $(function() {
 	QUnit.test('isMouseEvent', function(assert) {
 		var mouseEnterEvent = new $.Event('mouseenter', { pageX: 2, pageY: 3 }),
 			mouseEventWithoutData = new $.Event('mouseenter'),
+			focusEvent = new $.Event('focus', { pageX: 0, pageY: 0 }),
 			emptyEvent = new $.Event();
 
 		assert.strictEqual(isMouseEvent(mouseEnterEvent), true, 'The mouseenter event with coordinates is a mouse event');
 		assert.strictEqual(isMouseEvent(mouseEventWithoutData), false, 'The mouseenter event without coordinates is not a mouse event');
+		assert.strictEqual(isMouseEvent(focusEvent), false, 'The focus event is not a mouse event, even with mouse coordinates');
 		assert.strictEqual(isMouseEvent(emptyEvent), false, 'Empty event is not a mouse event');
 		assert.strictEqual(isMouseEvent(), false, 'Undefined argument is not a mouse event');
 	});