Function handle_cancel

tests/test_cancellederror.py:12–13

(request: Request, exc: CancelledError)

    @app.exception(CancelledError)
    async def handle_cancel(request: Request, exc: CancelledError):
        return json({"message": exc.args[0]}, status=418)

    _, response = app.test_client.get("/")
    assert response.status == 418