Fix Shiboken warnings in unit tests

[soininen]

One of the warnings was probably a minor visual bug in check box lists.

No associated issue

Checklist before merging

• Documentation is up-to-date
• Release notes have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black & isort
• Unit tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.83%. Comparing base (42b4617) to head (4c6fc8c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3202   +/-   ##
=======================================
  Coverage   68.82%   68.83%           
=======================================
  Files         198      198           
  Lines       38342    38342           
  Branches     4596     4596           
=======================================
+ Hits        26390    26391    +1     
+ Misses      10644    10643    -1     
  Partials     1308     1308           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.