Writes deterministic unit tests for Blocs using `bloc_test` and `mocktail`, including tests for `bloc_concurrency` transformers and `HydratedBloc` persistence. Use when adding tests for a Bloc's event handlers, verifying its emitted state sequence, mocking a Repository dependency, or asserting that
Writes deterministic unit tests for Blocs using `bloc_test` and `mocktail`, including tests for `bloc_concurrency` transformers and `HydratedBloc` persistence. Use when adding tests for a Bloc's event handlers, verifying its emitted state sequence, mocking a Repository dependency, or asserting that `restartable()` cancels in-flight requests. Prerequisite: `flutter-bloc-setup`, `flutter-bloc-featur