registry (threading): fix broken but passing test

[x0ul]

Hello, while hacking on your framework I noticed these two tests were passing when they shouldn't have been. I realized that in both cases the tests were missing the actor ref fixture parameters, so no actors were ever added to the registry. The assertions inside the loops over the actor refs retrieved from the registry consequently never ran!

I've added the missing actor refs to both tests, plus some additional asserts to cover that the registry contains the expected actors.

Thanks for writing this excellent library (the code is extremely pleasant to work with, I can learn a lot from this). I hope you find this contribution useful.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.30%. Comparing base (1f4a1f6) to head (a051078).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #217   +/-   ##
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  Coverage   93.30%   93.30%           
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  Files          14       14           
  Lines         553      553           
  Branches       76       76           
=======================================
  Hits          516      516           
  Misses         32       32           
  Partials        5        5           

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[jodal]

Thanks for writing this excellent library (the code is extremely pleasant to work with, I can learn a lot from this). I hope you find this contribution useful.

Thanks, both for the kind words and the fix!