Port testkit test to testkit client

[blkt]

I forgot to port this last test.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.28%. Comparing base (a517677) to head (b4441ca).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2073   +/-   ##
=======================================
  Coverage   48.27%   48.28%           
=======================================
  Files         236      236           
  Lines       29900    29900           
=======================================
+ Hits        14434    14436    +2     
+ Misses      14367    14365    -2     
  Partials     1099     1099           

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