Fixed JuliaCon review errors with the tests

[kaipartmann]

See #167.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.33%. Comparing base (f5898d9) to head (8894ba1).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
- Coverage   90.34%   90.33%   -0.01%     
==========================================
  Files          43       43              
  Lines        4050     4047       -3     
==========================================
- Hits         3659     3656       -3     
  Misses        391      391              

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