test: try using Kotlin to write test code.

[overcat]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.76%. Comparing base (268b133) to head (d18a119).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #715   +/-   ##
=========================================
  Coverage     80.76%   80.76%           
  Complexity     1300     1300           
=========================================
  Files           214      214           
  Lines          5065     5065           
  Branches        429      429           
=========================================
  Hits           4091     4091           
  Misses          715      715           
  Partials        259      259           

see 2 files with indirect coverage changes

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