make tests more robust to dot product implementation

[ks905383]

All xa.aggregate() tests now test both the for loop and the dot product implementations

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0075c7e) 82.37% compared to head (2a5d31c) 83.36%.
Report is 2 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   82.37%   83.36%   +0.99%     
==========================================
  Files          13       13              
  Lines         885     1070     +185     
==========================================
+ Hits          729      892     +163     
- Misses        156      178      +22     

Flag	Coverage Δ
unittests	83.36% <100.00%> (+0.99%)	⬆️

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