Minor fix to tests

[marcofavoritobi]

Proposed changes

Do minor fixes to tests:

• skip TestPlotSampling test on Windows, due to flakiness;
• fix bug in BH4
• add reproducibility tests for BH models
• remove e2e mark to TestMainExample.
• remove duplication of BH4 and NormalV in fixtures.test_models

[codecov-commenter]

Codecov Report

Merging #68 (39ee0d5) into main (c5a5b88) will increase coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   91.36%   91.38%   +0.01%     
==========================================
  Files          42       42              
  Lines        1737     1729       -8     
==========================================
- Hits         1587     1580       -7     
+ Misses        150      149       -1     

see 1 file with indirect coverage changes