test: add non-integer test on xyJoinX

[lpatiny]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (22a6640) to head (3d0cb74).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files         181      181           
  Lines        4997     4997           
  Branches     1130     1130           
=======================================
  Hits         4810     4810           
  Misses        187      187           

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