Update tests for more coverage

[kdheepak]

WIP

Fixes #24

[codecov-io]

Codecov Report

Merging #34 into master will increase coverage by 0.42%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   68.52%   68.95%   +0.42%     
==========================================
  Files          47       47              
  Lines        3050     3050              
==========================================
+ Hits         2090     2103      +13     
+ Misses        960      947      -13

Impacted Files	Coverage Δ
opendssdirect/CapControls.py	60.41% <0%> (+1.04%)	⬆️
opendssdirect/Bus.py	100% <0%> (+6.75%)	⬆️
opendssdirect/Basic.py	95.83% <0%> (+14.58%)	⬆️

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