Form submit handler for database form_state test.
function form_test_form_state_database_submit($form, &$form_state) {
$form_state['cache'] = TRUE;
$form_state['rebuild'] = TRUE;
if ($form_state['storage']['database'] instanceof $form_state['storage']['database_class']) {
$form_state['storage']['database_connection_found'] = TRUE;
}
}