test: Increase test coverage

Sebastian N. Kauperequested to merge
test/increase-coverage into main

Summary

Increases the test coverage to almost 90%.

Description

-- Add a detailed description of the changes --

Checklist

  • Have the changes been tested?
  • Have tests (e.g. unit tests) been adapted or new ones written?
  • Has the changelog been updated?
  • Are all pipelines completed successfully?
  • Was a review completed by someone else?
Edited by Philip Rühl

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