Disallow untyped defs in tests

[Dreamsorcerer]

No description provided.

[codecov]

Codecov Report

Merging #5829 (10ea33c) into master (38c396b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5829   +/-   ##
=======================================
  Coverage   96.75%   96.75%           
=======================================
  Files          44       44           
  Lines        9849     9849           
  Branches     1591     1591           
=======================================
  Hits         9529     9529           
  Misses        182      182           
  Partials      138      138           

Flag	Coverage Δ
unit	96.64% <ø> (ø)

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