testing-cqrs-handlers

To write unit tests for CQRS command handlers, you set up a mock ApplicationContext and verify command handling logic in isolation. This approach ensures the handler logic is validated without triggering real bus interactions or external dependencies.

Testing authorization and validation in a CQRS pipeline ensures security and data integrity execute before business logic. You verify Jakarta Bean Validation checks and authorization rules using structured test context propagation within integration tests.

To verify domain event emission in reactive CQRS handlers, you check that published events are emitted when handlers succeed and suppressed when not annotated. This confirms your event-driven architecture behaves correctly across the reactive pipeline.

The best way to mock the Command Bus and ExecutionContext for CQRS tests is to simulate bus interactions and context propagation directly. This exercises the full pipeline safely, allowing you to test user and tenant context, feature flags, and properties.

Yes, this CQRS testing approach works specifically with reactive Firefly-based services. It applies to writing tests for command handlers, query handlers, and the CQRS pipeline, covering mocking the bus, integration scenarios, and edge-case checks.