replaced test config files with default config

[jstucke]

• replaced test config files with default config
  • this fixes the problem that these config files always need to be updated as well if the default config changes
  • additional advantage: the default config is tested and the tests make sure that it is valid

resolves #1036

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.87%. Comparing base (58fe736) to head (3c93be6).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1296      +/-   ##
==========================================
- Coverage   92.25%   91.87%   -0.38%     
==========================================
  Files         376      376              
  Lines       22054    21080     -974     
==========================================
- Hits        20346    19368     -978     
- Misses       1708     1712       +4     

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