Switch from Jasmine to Mocha to get better text diffs when assertions fail

[gregjacobs]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.62%. Comparing base (ca28acd) to head (539d8a8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #421   +/-   ##
=======================================
  Coverage   95.62%   95.62%           
=======================================
  Files          23       23           
  Lines        1370     1370           
  Branches      332      332           
=======================================
  Hits         1310     1310           
  Misses         36       36           
  Partials       24       24           

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