Fix: Remove unused test facilities related to removed file argument

[localheinz]

This PR

• removes unused test facilities related to previously removed file argument

Related to #143.
Follows #151.

[codecov]

Codecov Report

Merging #164 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #164   +/-   ##
=========================================
  Coverage     79.87%   79.87%           
  Complexity       31       31           
=========================================
  Files             2        2           
  Lines           164      164           
=========================================
  Hits            131      131           
  Misses           33       33

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