simplify controller test cases

[maskarb]

• update the controller test suite so the result of one test does not affect the result of another
• each test can now be run individually
• tests should be more robust to future code changes
• should be easier to add new tests in the future

[codecov]

Codecov Report

Merging #170 (f4fe2b3) into main (be0268b) will decrease coverage by 0.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
- Coverage   88.78%   88.27%   -0.52%     
==========================================
  Files          11       11              
  Lines        2328     2328              
==========================================
- Hits         2067     2055      -12     
- Misses        186      196      +10     
- Partials       75       77       +2     

Flag	Coverage Δ
unittests	88.27% <ø> (-0.52%)	⬇️

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