FastAPI

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The harness does not import FastAPI. TestClient calls the route, and dependency_overrides installs the mediator. Assert requests and outbox. published stays empty while the row is still pending.

See FastAPI.

from fastapi.testclient import TestClient

app.dependency_overrides[mediator_factory] = lambda: mediator
async with test_harness.around(mediator, outbox=outbox) as harness:
    response = TestClient(app).post("/orders", json={"sku": "book"})
    assert response.status_code == 201
    assert harness.requests.contains(CreateOrder)
    assert harness.outbox.pending_count == 1

Library example: examples/testing/fastapi_app.py.