Error while running tests: Entity class not found

models/Group.php

@@ -2,6 +2,8 @@
 // grouptable doesn't extend Doctrine_Table -> Doctrine_Connection
 // won't initialize grouptable when Doctrine_Connection->getTable('Group') is called
 
+require_once('Entity.php');
+
 class GroupTable { }
 class Group extends Entity {
     public function setUp() {