diff --git a/tests/codeigniter/database/DB_test.php b/tests/codeigniter/database/DB_test.php
index d5c0dea..0c3df3f 100644
--- a/tests/codeigniter/database/DB_test.php
+++ b/tests/codeigniter/database/DB_test.php
@@ -34,6 +34,9 @@
 
 	// ------------------------------------------------------------------------
 
+	/**
+	 * @expectedException RuntimeException
+	 */
 	public function test_db_failover()
 	{
 		$config = Mock_Database_DB::config(DB_DRIVER);