Add test directory to coverage report

[efaulhaber]

All test code should be fully covered. If not, that means that we forgot to include a test file. The coverage report should include the test directory, so that we can immediately spot something like this.

[codecov]

Codecov Report

Merging #119 (85b0ed5) into main (41d93ed) will increase coverage by 3.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   41.47%   44.73%   +3.26%     
==========================================
  Files          27       34       +7     
  Lines        1999     2157     +158     
==========================================
+ Hits          829      965     +136     
- Misses       1170     1192      +22     

Flag	Coverage Δ
unitandintegration	44.73% <ø> (+3.26%)	⬆️

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see 7 files with indirect coverage changes

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