Add shadow root related tests

[mreiche]

No description provided.

[github-actions]

Test Results

90 tests  +2   88 ✅ +2   22s ⏱️ -1s
 1 suites ±0    2 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit ddff878. ± Comparison against base commit e4226f6.

[codecov]

Codecov Report

Attention: Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.78%. Comparing base (e4226f6) to head (ddff878).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
paf/uielement.py	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   97.96%   97.78%   -0.19%     
==========================================
  Files          15       15              
  Lines        1377     1398      +21     
==========================================
+ Hits         1349     1367      +18     
- Misses         28       31       +3     

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