TST:RF: Move common core test operations into helper methods

[scottclowe]

No description provided.

[codecov]

Codecov Report

Merging #201 (d6ecce2) into master (726a4ef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   93.09%   93.09%           
=======================================
  Files           8        8           
  Lines         912      912           
  Branches      189      189           
=======================================
  Hits          849      849           
  Misses         32       32           
  Partials       31       31           

Flag	Coverage Δ
nbsmoke	63.92% <ø> (ø)
unittests	92.98% <ø> (ø)

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