Increase test coverage 43.24% → 86.36%

[julioalucero]

Improve Test Coverage

Summary

Improved test coverage across controllers, models, and services.

• Some tests are basic, covering validations and basic objects.
• Others use mocks for now, but establishes a foundation for maintaining and improving test coverage.

By doing this change we increase Coverage from 43.24% → 86.36%

Before

After

Fix Deprecation Warnings

Fixes two Rails 8.1 deprecation warnings:

1. HTTP status code: Updated :unprocessable_entity → :unprocessable_content Url: TBD maybe Rack status code name changes breaks HttpStatusMatcher rspec/rspec-rails#2763?
2. Timezone handling: Added config.active_support.to_time_preserves_timezone = :zone URL: TBD, maybe app:update prints deprecation warnings during active_storage:update rails/rails#53558

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.35%. Comparing base (4697f35) to head (a6331aa).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #129       +/-   ##
===========================================
+ Coverage   62.69%   86.35%   +23.65%     
===========================================
  Files          48       48               
  Lines         689      689               
===========================================
+ Hits          432      595      +163     
+ Misses        257       94      -163     

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