]
    assert len(data_lines) == 2


# Keepalive ping tests


keepalive_app = FastAPI()


@keepalive_app.get("/slow-async", response_class=EventSourceResponse)
async def slow_async_stream():
    yield {"n": 1}
    # Sleep longer than the (monkeypatched) ping interval so a keepalive
    # comment is emitted before the next item.
    await asyncio.sleep(0.3)

                    ObjectReceiveStream[bytes]
                ]:
                    # Use a memory stream to decouple generator iteration
                    # from the keepalive timer. A producer task pulls items
                    # from the generator independently, so
                    # `anyio.fail_after` never wraps the generator's