Add test for path dependency

[luca-della-vedova]

Turns out it's just one line since we already have two packages

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.28%. Comparing base (9f1da80) to head (bcb5722).

Additional details and impacted files

@@                     Coverage Diff                     @@
##           cottsay/dep-source-info      #53      +/-   ##
===========================================================
+ Coverage                    66.79%   68.28%   +1.49%     
===========================================================
  Files                            7        7              
  Lines                          268      268              
  Branches                        46       46              
===========================================================
+ Hits                           179      183       +4     
+ Misses                          60       56       -4     
  Partials                        29       29              

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[luca-della-vedova]

Sadly the test became fairly convoluted because we need to support old Python versions, but at least now we can make sure path resolution works