Adds flake8 on tests dir to make format

[ajpotts]

Adds flake8 on tests directory to make format.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff            @@
##             main     #5317   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?         4           
  Lines           ?        63           
  Branches        ?         0           
========================================
  Hits            ?        63           
  Misses          ?         0           
  Partials        ?         0           

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