The following functions are used all over Moodle but are not currently covered by unit tests. Behat tests should cover them to a large degree but it would be nice to have additional assurance.

1) get_groups_all() and get_groups($groupingid = 0) in modinfolib.php do not appear to be covered at all in modinfolib_test.php.

2) groups_get_user_groups() in grouplib.php. groups_get_user_groups() is itself not tested at all in grouplib_test.php