Add show test for DimSelectors

[felixcremer]

I also added a println because it looked a bit strange otherwise.
Because the selector type was moved outside of the box.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.84%. Comparing base (8775318) to head (f9e33ae).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1081      +/-   ##
==========================================
+ Coverage   86.52%   86.84%   +0.32%     
==========================================
  Files          54       54              
  Lines        5282     5283       +1     
==========================================
+ Hits         4570     4588      +18     
+ Misses        712      695      -17     

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