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fastapi/routing.py

@@ -411,9 +411,13 @@ def get_request_handler(
                     # Add dependency tasks
                     # solved_result.background_tasks is always BackgroundTasks (from dependencies/utils.py)
                     if isinstance(solved_result.background_tasks, BackgroundTasks):
-                        combined_tasks.tasks.extend(solved_result.background_tasks.tasks)
-                    elif isinstance(solved_result.background_tasks, BackgroundTask):  # pragma: no cover
-                         # Should not happen for BackgroundTasks dependency but safe to handle
+                        combined_tasks.tasks.extend(
+                            solved_result.background_tasks.tasks
+                        )
+                    elif isinstance(
+                        solved_result.background_tasks, BackgroundTask
+                    ):  # pragma: no cover
+                        # Should not happen for BackgroundTasks dependency but safe to handle
                         combined_tasks.tasks.append(solved_result.background_tasks)
 
                     raw_response.background = combined_tasks

tests/test_issue_11215.py

@@ -4,6 +4,7 @@ from starlette.responses import BackgroundTask, Response
 
 app = FastAPI()
 
+
 @app.get("/")
 def endpoint(tasks: BackgroundTasks):
     tasks.add_task(lambda: print("Dependency task executed"))
@@ -12,8 +13,10 @@ def endpoint(tasks: BackgroundTasks):
         background=BackgroundTask(lambda: print("Response task executed")),
     )
 
+
 client = TestClient(app)
 
+
 def test_issue_11215(capsys):
     client.get("/")
     captured = capsys.readouterr()

tests/test_issue_11215_coverage.py

@@ -5,6 +5,7 @@ from starlette.responses import Response
 
 app = FastAPI()
 
+
 @app.get("/")
 def endpoint(tasks: BackgroundTasks):
     tasks.add_task(lambda: print("Dependency task"))
@@ -17,8 +18,10 @@ def endpoint(tasks: BackgroundTasks):
         background=response_tasks,
     )
 
+
 client = TestClient(app)
 
+
 def test_issue_11215_response_background_tasks_collection(capsys):
     client.get("/")
     captured = capsys.readouterr()