Thanks a lot for the contribution - I would love to merge, but can't as long as there is test breakage. Maybe it's an easy fix.

I tried a work-around but i'm not sure of it, there is some circular dependency between the search got the .git directory in Repo and the initialization of the self.git command wrapper (the git command should be able to find the .git itself, but the late initialization has maybe some use).

And it works (I don't know the problem with appveyor, I do not think it's related to my patch).

Codecov Report

Merging #894 into master will decrease coverage by 0.02%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master     #894      +/-   ##
==========================================
- Coverage    93.6%   93.57%   -0.03%     
==========================================
  Files          59       59              
  Lines        9769     9787      +18     
==========================================
+ Hits         9144     9158      +14     
- Misses        625      629       +4

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Thanks so much! I am glad you could find the time.
In the next days, GitPython 3 will be released and include the fix.