support no args jobs

[markburns-tembo]

• add spec for no args passed to job klass
• add spec
• rubocop

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.69%. Comparing base (30cb591) to head (ad24d59).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
=======================================
  Files          33       33           
  Lines         840      843    +3     
=======================================
+ Hits          829      832    +3     
  Misses         11       11           

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