Add test for figures package

[jeffsee55]

This is a pretty basic test, I didn't want to change the implementation so stubbing the environment was a hands-off way to get a baseline test in there.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.85%. Comparing base (0dfa6bd) to head (7a31b13).
Report is 45 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1390      +/-   ##
==========================================
+ Coverage   94.46%   96.85%   +2.39%     
==========================================
  Files          53       54       +1     
  Lines        4556     4967     +411     
  Branches      772      817      +45     
==========================================
+ Hits         4304     4811     +507     
+ Misses        247      148      -99     
- Partials        5        8       +3     

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[SBoudrias]

Thanks!