TST: Add test code for less frequently encountered paths

[bashtage]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.29%. Comparing base (366347b) to head (d79629b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
randomgen/__init__.py	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
+ Coverage   92.91%   93.29%   +0.37%     
==========================================
  Files          54       54              
  Lines        8441     8456      +15     
  Branches      535      539       +4     
==========================================
+ Hits         7843     7889      +46     
+ Misses        571      540      -31     
  Partials       27       27              

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