fixed tests

tests/api/test_download_endpoints.py

@@ -95,6 +95,7 @@ def mock_download_service():
     # Mock start/stop - start_queue_processing returns True on success
     service.start_queue_processing = AsyncMock(return_value=True)
     service.stop = AsyncMock()
+    service.stop_downloads = AsyncMock()
 
     # Mock clear_completed and retry_failed
     service.clear_completed = AsyncMock(return_value=5)
@@ -321,7 +322,7 @@ async def test_stop_downloads(authenticated_client, mock_download_service):
     assert data["status"] == "success"
     assert "stopped" in data["message"].lower()
 
-    mock_download_service.stop.assert_called_once()
+    mock_download_service.stop_downloads.assert_called_once()
 
 
 @pytest.mark.asyncio