ENH: Run pytest on CircleCI

[effigies]

We don't currently run tests in an environment with everything installed.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.42% 🎉

Comparison is base (506df71) 52.58% compared to head (601231e) 54.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #364      +/-   ##
==========================================
+ Coverage   52.58%   54.00%   +1.42%     
==========================================
  Files          22       23       +1     
  Lines        1666     1685      +19     
  Branches      229      229              
==========================================
+ Hits          876      910      +34     
+ Misses        722      719       -3     
+ Partials       68       56      -12     

Flag	Coverage Δ
ds005	∅ <ø> (∅)
ds054	44.65% <ø> (ø)
pytest	30.02% <ø> (?)

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see 8 files with indirect coverage changes

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