Try to improve theme tests

[hoxbro]

These tests seem to fail a lot. This is an attempt to fix it.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.56%. Comparing base (7377c9e) to head (102501b). Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6848      +/-   ##
==========================================
+ Coverage   81.51%   81.56%   +0.04%     
==========================================
  Files         318      318              
  Lines       46709    46780      +71     
==========================================
+ Hits        38076    38154      +78     
+ Misses       8633     8626       -7     

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