Optimize tests

[gromdimon]

Issue:

• Closes Sort and refine Tests #198

Description:

• Added comments to tests
• Fixed some skipped tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.39%. Comparing base (30d9b46) to head (0500574).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   86.78%   87.39%   +0.60%     
==========================================
  Files          65       65              
  Lines        5624     5624              
==========================================
+ Hits         4881     4915      +34     
+ Misses        743      709      -34     

Files with missing lines	Coverage Δ
src/seqvar/auto_pp3_bp4.py	97.45% <100.00%> (+2.54%)	⬆️

... and 5 files with indirect coverage changes