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fastapi/routing.py

@@ -656,8 +656,8 @@ class APIRoute(routing.Route):
         )
 
     @cached_property
-    def response_fields(self) -> dict[int| str, ModelField]:
+    def response_fields(self) -> dict[int | str, ModelField]:
-        response_fields: dict[int| str, ModelField] = {}
+        response_fields: dict[int | str, ModelField] = {}
         for additional_status_code, response in self.responses.items():
             assert isinstance(response, dict), "An additional response must be a dict"
             model = response.get("model")

tests/test_route_deferred_init.py

@@ -1,5 +1,4 @@
 from itertools import chain
-from typing import Optional
 
 from fastapi import APIRouter, Depends, FastAPI
 from fastapi.routing import APIRoute
@@ -26,9 +25,7 @@ def check_if_initialized(route: APIRoute, should_not: bool = False):
             assert key in route.__dict__
 
 
-def create_test_router(
+def create_test_router(routes: list[BaseRoute] | None = None, defer_init: bool = True):
-    routes: Optional[list[BaseRoute]] = None, defer_init: bool = True
-):
     router = APIRouter(routes=routes or [], defer_init=defer_init)
 
     class UserIdBody(BaseModel):