The "test-subtree" command:

Usage: fossil test-subtree ?OPTIONS?

Show the subset of check-ins that match the supplied options.  This
command is used to test the subtree_from_options() subroutine in the
implementation and does not really have any other practical use that
we know of.

Options:
   --branch BRANCH           Include only check-ins on BRANCH
   --from TAG                Start the subtree at TAG
   --to TAG                  End the subtree at TAG
   --checkin TAG             The subtree is the single check-in TAG
   --all                     Include FILE and TAG artifacts
   --exclusive               Include FILES exclusively on check-ins