Follow up fix for #187

[cracksalad]

This is a follow up of #187
Added a test case to cover backed enums as well. The proper solution is way easier than the one I wrote last time. Sorry for messing this up.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.65%. Comparing base (35d4381) to head (26c8c70).
⚠️ Report is 8 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
+ Coverage   68.51%   68.65%   +0.13%     
==========================================
  Files           7        7              
  Lines        1350     1356       +6     
  Branches      247      248       +1     
==========================================
+ Hits          925      931       +6     
  Misses        310      310              
  Partials      115      115              

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