class CustomModel(BaseModel):
    a: int


app = FastAPI()

callback_router = APIRouter(default_response_class=JSONResponse)


@callback_router.get(
    "{$callback_url}/callback/", responses={400: {"model": CustomModel}}
)
def callback_route():
    pass  # pragma: no cover


@app.post("/", callbacks=callback_router.routes)
def main_route(callback_url: HttpUrl):
    pass  # pragma: no cover

        },
    }


def test_callback_override_generate_unique_id():
    app = FastAPI(generate_unique_id_function=custom_generate_unique_id)
    callback_router = APIRouter(generate_unique_id_function=custom_generate_unique_id2)

    @callback_router.post(
        "/post-callback",
        response_model=list[Item],
        responses={404: {"model": list[Message]}},