Added test for multiprocessing of roadrunner.

[PaulJonasJost]

Roadrunner after 2.7.0 should be able to handle multiprocessing engine. added a small test. Debatable whether 30 starts is enough/too much, kinda hard to estimate.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.33%. Comparing base (ef34eeb) to head (86188ba).

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1408      +/-   ##
===========================================
+ Coverage    82.26%   83.33%   +1.06%     
===========================================
  Files          161      161              
  Lines        13237    13237              
===========================================
+ Hits         10890    11031     +141     
+ Misses        2347     2206     -141     

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