Add allocation tests

[blegat]

Hardcoding that we want matrices for now, at least it gets allocation tests working, the goal will be to keep allocation at zero now but support non-matrices as well

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.87%. Comparing base (eada150) to head (f6b64a9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   89.87%   89.87%           
=======================================
  Files          23       23           
  Lines        2844     2844           
=======================================
  Hits         2556     2556           
  Misses        288      288           

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