In a recent codebase update (commit ae8e378430, merge branch 'ps/reftable-write-options', 2024/05/13) the geometric factor used in auto-compaction of reftable tables was made configurable. Add a test to verify the functionality introduced by this update. Mentored-by: Patrick Steinhardt <ps@pks.im> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Chandra Pratap <chandrapratap3519@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>