fastapi/docs/en/docs/advanced/testing-events.md

Testing Events: lifespan and startup - shutdown

When you need lifespan to run in your tests, you can use the TestClient with a with statement:

{* ../../docs_src/app_testing/tutorial004.py hl[9:15,18,27:28,30:32,41:43] *}

You can read more details about the "Running lifespan in tests in the official Starlette documentation site."

For the deprecated startup and shutdown events, you can use the TestClient as follows:

{* ../../docs_src/app_testing/tutorial003.py hl[9:12,20:24] *}