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Fix tests for Git submodule #3737
I didn't have this problem in my local setup either.
I remember that I had this problem when I was working with the VCS code and this was exactly the problem: wrong GIT_DIR environment variable.
This isn't dangerous as it is, but a small change will end up changing the global git defaults in the under the current user.
As David said, I suppose that it's better explicit here. So, we are good.
(I tested this locally by running all the py36 tests and did work)