Utils fixme - added some unit tests

[joshgabriel]

added some unit tests .. to see if coverage improves

[codecov-io]

Codecov Report

Merging #12 into master will increase coverage by 0.72%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   55.65%   56.38%   +0.72%     
==========================================
  Files          32       32              
  Lines        2566     2586      +20     
==========================================
+ Hits         1428     1458      +30     
+ Misses       1138     1128      -10

Impacted Files	Coverage Δ
mpinterfaces/tests/test_utils.py	99.05% <100%> (+0.15%)	✅
mpinterfaces/utils.py	46.28% <100%> (+2.26%)	✅

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