diff --git a/tests/test_additional_responses_no_mutation.py b/tests/test_additional_responses_no_mutation.py
index 589b893ed..95abbc457 100644
--- a/tests/test_additional_responses_no_mutation.py
+++ b/tests/test_additional_responses_no_mutation.py
@@ -5,6 +5,7 @@ See https://github.com/fastapi/fastapi/pull/14463
 """
 
 from typing import Union
+
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from pydantic import BaseModel