Testing asynchronous applications with FastAPI and pytest
summary
Shows concrete test code: unit tests use FastAPI test client with async mocks to avoid startup pubsub calls, end‑to‑end tests use pytest + httpx async client against a running server and a real redis pub/sub, creating a subscriber task, posting a user, asserting the broadcasted create event, then unsubscribing. Demonstrates kernelCI‑API backend, specific fixtures, async mock usage, ordered tests and that the pipeline passes when redis and the API are actually run.
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