Writes .coverage.*.*.* files into current directory
My tests create a temp dir, chdir there, run actions, and then verify what files got created. Trying to use pytest-cov with them causes a lot of errors with new .coverage.* files added into my temp dir. Coverage should keep its writes localized to near the .coverage file at the top of the tree, to avoid causing trouble.
I tried to set data_file, but I can't seem to make --cov-config do anything useful.