test: add some doctests

[oameye]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.77%. Comparing base (5659f79) to head (d794a92).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   66.44%   66.77%   +0.32%     
==========================================
  Files           8        8              
  Lines         304      304              
==========================================
+ Hits          202      203       +1     
+ Misses        102      101       -1     

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