chore: add test for minifying nth selectors

[bartveneman]

No description provided.

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.78%. Comparing base (59c00e7) to head (2efbeca).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
=======================================
  Coverage   96.78%   96.78%           
=======================================
  Files           2        2           
  Lines         342      342           
  Branches      119      119           
=======================================
  Hits          331      331           
  Misses         10       10           
  Partials        1        1           

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