Refactor tests to increase coverage

[codingjoe]

No description provided.

[codecov]

Codecov Report

Merging #179 into master will increase coverage by 3.92%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   92.49%   96.41%   +3.92%     
==========================================
  Files           5        5              
  Lines         253      251       -2     
==========================================
+ Hits          234      242       +8     
+ Misses         19        9      -10

Impacted Files	Coverage Δ
stdimage/management/commands/rendervariations.py	100% <100%> (+17.02%)	⬆️
stdimage/models.py	95.08% <0%> (+1.63%)	⬆️

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