Revise control tests

[lenasal]

• added tests for so far uncovered functions
• moved static functions and parameters to test_oc_utils

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (762456a) 91.14% compared to head (75fb962) 91.08%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
- Coverage   91.14%   91.08%   -0.06%     
==========================================
  Files          65       65              
  Lines        5189     5189              
==========================================
- Hits         4729     4726       -3     
- Misses        460      463       +3     

Flag	Coverage Δ
unittests	91.08% <ø> (-0.06%)	⬇️

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