another of those "duh! what was I thinking" moments, this specific one
being "why test that files/directories are created with the right user
and group IDs? Shouldn't that be out of your control, as well as
totally unnecessary on a sane system?"
(1) testing is very easy, just run this from a clone
t/g3-clean-install-setup-test
BUT BE WARNED THIS IS DESTRUCTIVE; details in t/WARNING
(2) install is equally simple; see 'INSTALL' in the main directory