test: cleanup some tests, add more testdata

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #15 (1fe98c4) into main (355fdc6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files          29       29           
  Lines        2011     2011           
=======================================
  Hits         2004     2004           
  Misses          6        6           
  Partials        1        1           

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