from fastapi import APIRouter, FastAPI from fastapi.testclient import TestClient app = FastAPI() router = APIRouter() @router.get("/users/{id}") def read_user(segment: str, id: str): return {"segment": segment, "id": id} app.include_router(router, prefix="/{segment}") client = TestClient(app) def test_get(): response = client.get("/seg/users/foo") assert response.status_code == 200, response.text assert response.json() == {"segment": "seg", "id": "foo"}