Unit tests fix

tests/unit/framework/rbac/PhpManagerTest.php

@@ -2,6 +2,7 @@
 
 namespace yiiunit\framework\rbac;
 
+use Yii;
 use yii\rbac\PhpManager;
 
 require_once(__DIR__ . '/ManagerTestBase.php');
@@ -10,7 +11,7 @@ class PhpManagerTest extends ManagerTestBase
 {
 	public function setUp()
 	{
-		$authFile = \Yii::$app->getRuntimePath() . '/rbac.php';
+		$authFile = Yii::$app->getRuntimePath() . '/rbac.php';
 		@unlink($authFile);
 		$this->auth = new PhpManager;
 		$this->auth->authFile = $authFile;