Refactor: Migrate model unit tests to Swift Testing

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.43%. Comparing base (3c3915c) to head (a1ca5d9). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #190 +/- ## ========================================== + Coverage 89.36% 89.43% +0.07% ========================================== Files 203 203 Lines 2820 2820 ========================================== + Hits 2520 2522 +2 + Misses 300 298 -2 ```

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