First Unit Tests

[codecov-io]

Codecov Report

Merging #277 into master will increase coverage by 0.12%. The diff coverage is 75.71%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   40.23%   40.36%   +0.12%     
==========================================
  Files          86       86              
  Lines       20033    20078      +45     
==========================================
+ Hits         8060     8104      +44     
- Misses      11973    11974       +1

Impacted Files	Coverage Δ
ditto/models/line.py	100% <ø> (ø)	:arrow_up:
ditto/readers/abstract_reader.py	44.9% <100%> (+2.72%)	:arrow_up:
ditto/readers/opendss/read.py	64.63% <75%> (+0.78%)	:arrow_up:
ditto/writers/cyme/write.py	46.61% <76.92%> (-0.59%)	:arrow_down:
ditto/writers/ephasor/write.py	90.04% <0%> (-0.21%)	:arrow_down:
ditto/writers/gridlabd/write.py	85.47% <0%> (ø)	:arrow_up:
ditto/metrics/network_analysis.py	49.1% <0%> (+0.52%)	:arrow_up:

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[kdheepak]

See #320.