Update tests to ensure config files are accessed from absolute paths

[pfeairheller]

The PR ensures config files are accessed from absolute paths not relative to where the test is being run.

The previous behavior was causing the creation of new empty config files if tests were run from anywhere but the root directory of project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.81%. Comparing base (5f06007) to head (bf92386).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
- Coverage   93.08%   92.81%   -0.28%     
==========================================
  Files          38       37       -1     
  Lines        7002     6974      -28     
==========================================
- Hits         6518     6473      -45     
- Misses        484      501      +17     

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