Start at moving tests for git module ⚡️

[lwasser]

This is ready for a review. I still am struggling to raise a filenotfound see #468 and also we need to resolve how we want to handle commit messages: see: #466

#466 #465 are related to this PR and could be addressed here as well potentially

i'm slowly updating docstrings as i write tests.

There is also a general question about some of the git / github functionality. it's easy to test git operations that don't hit github because authentication doesn't seem to be an issue. you can run git status for instance and it just works. But if we use SSH we can't really clone or pull without it benign setup and doing that on ci is tricky.

So one option is to have a suite of tests that only run locally. but even then pushing to a random repo seems a bit tricky too as it does require permissions that a new dev may not have. so i'm not sure how to do this without a good bit of mocking.

[codecov[bot]]

Codecov Report

Merging #462 (8059dd6) into main (f680b89) will increase coverage by 5.86%. The diff coverage is 99.09%.

@@            Coverage Diff             @@
##             main     #462      +/-   ##
==========================================
+ Coverage   60.61%   66.48%   +5.86%     
==========================================
  Files          20       20              
  Lines        1163     1265     +102     
==========================================
+ Hits          705      841     +136     
+ Misses        458      424      -34     

Flag	Coverage Δ
unittests	66.48% <99.09%> (+5.86%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
abcclassroom/tests/test_git.py	99.21% <99.07%> (-0.79%)	:arrow_down:
abcclassroom/git.py	82.00% <100.00%> (+36.08%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update f680b89...8059dd6. Read the comment docs.

[lwasser]

consider pulling out updates to the code base vs tests...