docs(assert): improve assert() docs and test coverage

[tomas-zijdemans]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.08%. Comparing base (885c4f9) to head (04bb9af).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6955      +/-   ##
==========================================
- Coverage   94.08%   94.08%   -0.01%     
==========================================
  Files         600      600              
  Lines       43541    43540       -1     
  Branches     6992     6991       -1     
==========================================
- Hits        40967    40965       -2     
- Misses       2519     2520       +1     
  Partials       55       55              

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