diff --git a/fastapi/routing.py b/fastapi/routing.py
index 1586ee63b5..5176861a77 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -61,9 +61,9 @@ from fastapi.utils import (
     is_body_allowed_for_status_code,
 )
 from starlette import routing
-from starlette.background import BackgroundTasks as StarletteBackgroundTasks
 from starlette._exception_handler import wrap_app_handling_exceptions
 from starlette._utils import is_async_callable
+from starlette.background import BackgroundTasks as StarletteBackgroundTasks
 from starlette.concurrency import run_in_threadpool
 from starlette.exceptions import HTTPException
 from starlette.requests import Request
@@ -446,9 +446,7 @@ def get_request_handler(
                         merged.tasks.extend(existing.tasks)
                     else:
                         merged.tasks.append(existing)
-                    merged.tasks.extend(
-                        solved_result.background_tasks.tasks
-                    )
+                    merged.tasks.extend(solved_result.background_tasks.tasks)
                     raw_response.background = merged
                 response = raw_response
             else:
diff --git a/tests/test_background_tasks_merge.py b/tests/test_background_tasks_merge.py
index 84565ed5fd..94f2a51bd4 100644
--- a/tests/test_background_tasks_merge.py
+++ b/tests/test_background_tasks_merge.py
@@ -3,7 +3,6 @@ from fastapi.testclient import TestClient
 from starlette.background import BackgroundTask
 from starlette.responses import JSONResponse
 
-
 results: list[str] = []