protected function getDataStorage($data, $params = array())
{
$factory = new Horde_Kolab_Storage_Factory(array_merge(array('driver' => 'mock', 'params' => $data, 'logger' => $this->getMock('Horde_Log_Logger'), 'history_prefix_generator' => new Horde_Kolab_Storage_Stub_HistoryPrefix()), $params));
return $factory->create();
}