Add test for empty string arg

[RustedBones]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.31%. Comparing base (515120c) to head (46bf49b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5485      +/-   ##
==========================================
- Coverage   61.32%   61.31%   -0.01%     
==========================================
  Files         312      312              
  Lines       11077    11077              
  Branches      779      779              
==========================================
- Hits         6793     6792       -1     
- Misses       4284     4285       +1     

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