Move handler tests

[AlekSi]

Closes #237.

[codecov]

Codecov Report

Merging #239 (2c6c964) into main (fce7877) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #239   +/-   ##
=======================================
  Coverage   48.67%   48.67%           
=======================================
  Files         108      108           
  Lines        5048     5048           
=======================================
  Hits         2457     2457           
  Misses       2172     2172           
  Partials      419      419           

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