Re: [PATCH 03/12] t: drop useless sane_unset GIT_* calls

Jeff King [off-list ref] writes:

I do not have a problem with that, as it implicitly covers all of the
tests following it. I do not think it is particularly necessary, though.
Assuming we start with a known test environment and avoiding polluting
it for further tests are basic principles of _all_ test scripts.

They should be, but I suspect majority of tests, especially the
older ones, do have dependencies on earlier test pieces X-<.