Test cleanups

[marscher]

I just noticed that we have undefined references at some places in our code base. In this case the "first" and "second" argument in the overridden method were undefined.

This should also fix the float16 test failure which occurred every once in a while.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.19%. Comparing base (dfdeb76) to head (338c94b).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1239   +/-   ##
=======================================
  Coverage   87.19%   87.19%           
=======================================
  Files         113      113           
  Lines       10296    10296           
  Branches     4051     4051           
=======================================
  Hits         8978     8978           
  Misses        726      726           
  Partials      592      592           

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