REFACTOR: Migrate Discover tests to Swift Testing

[codecov[bot]]

Codecov Report

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

Project coverage is 89.40%. Comparing base (dc91d71) to head (f6e05a1). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #200 +/- ## ======================================= Coverage 89.40% 89.40% ======================================= Files 204 204 Lines 2860 2860 ======================================= Hits 2557 2557 Misses 303 303 ```

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