Add futher tests for badwords plugin

[codecov[bot]]

Codecov Report

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

Project coverage is 81.08%. Comparing base (492dbf5) to head (96aac13).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #679 +/- ## ========================================== + Coverage 80.84% 81.08% +0.23% ========================================== Files 279 280 +1 Lines 19602 19669 +67 Branches 3120 3126 +6 ========================================== + Hits 15847 15948 +101 + Misses 3503 3463 -40 - Partials 252 258 +6 ```

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