fix up test matrix implementation

[tclose]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.82%. Comparing base (7ae20cc) to head (009ce27).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #8   +/-   ##
=======================================
  Coverage   82.82%   82.82%           
=======================================
  Files           8        8           
  Lines          99       99           
=======================================
  Hits           82       82           
  Misses         17       17           

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