Test OC_User_Database in Test_User_Database instead of OC_User_Dummy.

tests/lib/user/database.php

@@ -33,7 +33,7 @@ class Test_User_Database extends Test_User_Backend {
 	}
 	
 	public function setUp() {
-		$this->backend=new OC_User_Dummy();
+		$this->backend=new OC_User_Database();
 	}
 	
 	public function tearDown() {