diff --git a/app/api/integrations.py b/app/api/integrations.py
index 9261e1a6..c0d58893 100644
--- a/app/api/integrations.py
+++ b/app/api/integrations.py
@@ -46,6 +46,7 @@ except ImportError:  # pragma: no cover
     class _DropboxBadInputError(Exception):  # type: ignore[no-redef]
         """Stub — only used when the dropbox package is missing."""
 
+
 logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/integrations", tags=["integrations"])
 
@@ -593,7 +594,10 @@ def _test_dropbox_connection(config: dict[str, Any] | None, credentials: dict[st
         return {"success": True, "message": f"Dropbox connection successful{name_str}"}
     except _DropboxAuthError as exc:
         logger.warning("Dropbox auth error: %s", exc)
-        return {"success": False, "message": "Dropbox authentication failed — check app_key, app_secret, and refresh_token"}
+        return {
+            "success": False,
+            "message": "Dropbox authentication failed — check app_key, app_secret, and refresh_token",
+        }
     except _DropboxBadInputError as exc:
         logger.warning("Dropbox bad input error: %s", exc)
         return {"success": False, "message": "Dropbox connection failed — invalid credentials format"}
diff --git a/tests/test_api_integrations.py b/tests/test_api_integrations.py
index df67a71d..45336b2d 100644
--- a/tests/test_api_integrations.py
+++ b/tests/test_api_integrations.py
@@ -932,9 +932,7 @@ class TestConnectionTestEndpoint:
         with patch("app.api.integrations.dbx_lib") as mock_dbx:
             mock_instance = MagicMock()
             mock_dbx.Dropbox.return_value = mock_instance
-            mock_instance.users_get_current_account.side_effect = dbx_exc.AuthError(
-                "req_id", MagicMock()
-            )
+            mock_instance.users_get_current_account.side_effect = dbx_exc.AuthError("req_id", MagicMock())
             payload = {
                 "integration_type": "DROPBOX",
                 "config": {},