Fix: Remove ergebnis/test-util

[localheinz]

This pull request

• removes ergebnis/test-util

[codecov]

Codecov Report

Merging #344 (e242e84) into main (bc7f78f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #344   +/-   ##
=========================================
  Coverage     93.18%   93.18%           
  Complexity       88       88           
=========================================
  Files            11       11           
  Lines           176      176           
=========================================
  Hits            164      164           
  Misses           12       12           

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