Move dictionaries needed for testing to new file

[mwcraig]

This ensures that we can get at those constants without having to have test dependencies (e.g. pytest) installed.

Fixes #465

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.40%. Comparing base (7f6ab4c) to head (2ae556c).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #466      +/-   ##
==========================================
+ Coverage   80.32%   80.40%   +0.07%     
==========================================
  Files          30       31       +1     
  Lines        3949     3960      +11     
==========================================
+ Hits         3172     3184      +12     
+ Misses        777      776       -1     

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[JuanCab]

Looks simple and good. Just curious, why the move to settings.constants if (I assume) these dicts are only used for testing. I see the stated reason about wanting to access without pytest, but I assume that only has to do with the fact there are pytest commands in the tests.test_models file... why change the directory as well?

[mwcraig]

I think, though I haven't checked, that putting it in test might have required the test imports? Not actually positive about that. I was inspired by a similar thing in ipyautoui...