Fixing issue in component test where AppController will cause failing…

… tests due to bleed through.

cake/tests/cases/libs/controller/component.test.php

@@ -426,6 +426,7 @@ function testComponentStartup() {
 	function testTriggerCallback() {
 		$Controller =& new ComponentTestController();
 		$Controller->components = array('ComponentMock');
+		$Controller->uses = null;
 		$Controller->constructClasses();
 
 		$Controller->ComponentMock->expectOnce('beforeRender');