diff --git a/tests/authentication/server_test.php b/tests/authentication/server_test.php
index 87842d03..211c03a1 100644
--- a/tests/authentication/server_test.php
+++ b/tests/authentication/server_test.php
@@ -5,9 +5,10 @@ class Authentication_Server_test extends PHPUnit_Framework_TestCase {
 	function setUp()
 	{
 		$this->oauth = new Oauth2\Authentication\Server();
-		
+
 		require_once('database_mock.php');
 		$this->oauthdb = new OAuthdb();
+		$this->assertInstanceOf('Oauth2\Authentication\Database', $this->oauthdb);
 		$this->oauth->registerDbAbstractor($this->oauthdb);
 	}
 
diff --git a/tests/resource/server_test.php b/tests/resource/server_test.php
index e66a05a6..456f686c 100644
--- a/tests/resource/server_test.php
+++ b/tests/resource/server_test.php
@@ -8,6 +8,7 @@ class Resource_Server_test extends PHPUnit_Framework_TestCase {
 		$this->server = new Oauth2\Resource\Server();
 		$this->db = new ResourceDB();
 
+		$this->assertInstanceOf('Oauth2\Resource\Database', $this->db);
 		$this->server->registerDbAbstractor($this->db);
 	}