test: Add exec tests for widen op

[croyzor]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.00%. Comparing base (fefa599) to head (aa35f46).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2043   +/-   ##
=======================================
  Coverage   82.00%   82.00%           
=======================================
  Files         234      234           
  Lines       41619    41619           
  Branches    37532    37532           
=======================================
+ Hits        34128    34129    +1     
+ Misses       5518     5517    -1     
  Partials     1973     1973           

Flag	Coverage Δ
python	85.22% <ø> (ø)
rust	81.65% <ø> (+<0.01%)	⬆️

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