Adds further unit tests for OctopOS

[JoshuaHassler]

No description provided.

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 18.84%.
The diff coverage is 88.46%.

@@             Coverage Diff             @@
##           master       #3       +/-   ##
===========================================
+ Coverage   64.85%   83.69%   +18.84%     
===========================================
  Files           8        8               
  Lines         367      417       +50     
  Branches       57       65        +8     
===========================================
+ Hits          238      349      +111     
+ Misses        129       68       -61

Impacted Files	Coverage Δ
src/octopos.cpp	82.85% <ø> (+8.99%)	⬆️
src/subscriber.cpp	92.68% <ø> (+33.15%)	⬆️
tests/test_octopOS.cpp	87.5% <88.46%> (+1.78%)	⬆️
src/tentacle.cpp	86% <0%> (+6%)	⬆️
include/publisher.h	88.57% <0%> (+12.1%)	⬆️
src/utility.cpp	56.66% <0%> (+40%)	⬆️
include/subscriber.h	86.04% <0%> (+57.47%)	⬆️

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