extras: Add more tests for Django form field for Rut

[jtrobles-cdd]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.82%. Comparing base (f3fb37a) to head (7562a17).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #883   +/-   ##
========================================
  Coverage    88.82%   88.82%           
========================================
  Files           38       38           
  Lines         3498     3498           
  Branches       342      342           
========================================
  Hits          3107     3107           
  Misses         239      239           
  Partials       152      152           

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