Test compatibility issues and small deprecation fix

[pedro-stanaka]

Hey guys, I stumbled upon a couple of problems while running the tests on docker (with alpine images), so I wanted to make this little change to make tests behavior better on newer versions of git and different linux distros.

Also, the factory method for Config from phpcs has been deprecated, I took time to fix that as well.

[codecov]

Codecov Report

Merging #414 (58acce9) into master (f34f997) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #414   +/-   ##
=========================================
  Coverage     99.38%   99.38%           
  Complexity     1863     1863           
=========================================
  Files           297      297           
  Lines          5871     5871           
=========================================
  Hits           5835     5835           
  Misses           36       36           

---

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 f34f997...58acce9. Read the comment docs.

[akondas]

Thanks 👍