WIP - test for cli args

[lholmquist]

fixes #69

This PR is for adding in tests for the commands of the cli.

It is currently a WIP, and more commits will be added to it. Probably 1 commit per command

[codecov[bot]]

Codecov Report

Merging #70 into master will increase coverage by 3.34%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   57.14%   60.49%   +3.34%     
==========================================
  Files          18       18              
  Lines         448      448              
==========================================
+ Hits          256      271      +15     
+ Misses        192      177      -15

Impacted Files	Coverage Δ
bin/cmd.js	41.57% <0%> (+12.35%)	:arrow_up:
lib/utils.js	70.96% <0%> (+12.9%)	:arrow_up:

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[lholmquist]

The changes in #73 will affect this PR a little bit, so just putting this on hold until that one is sorted out