Fix: Remove unused test doubles

[localheinz]

This pull request

• removes unused test doubles

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ff41300) 66.73% compared to head (6241e93) 66.73%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #409   +/-   ##
=========================================
  Coverage     66.73%   66.73%           
  Complexity       92       92           
=========================================
  Files            21       21           
  Lines           460      460           
=========================================
  Hits            307      307           
  Misses          153      153           

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