add single arg test_objects

[rafaqz]

@Datseris this PR implements the single argument test_objects method.

It returns a Dict of ObjType => test_object_vector

Closes #49

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.54%. Comparing base (071d44f) to head (9f61332).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   85.11%   87.54%   +2.43%     
==========================================
  Files           5        6       +1     
  Lines         215      257      +42     
==========================================
+ Hits          183      225      +42     
  Misses         32       32              

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