chore: import upstream snapshot with attribution

backend/tests/data/conftest.py

@@ -0,0 +1,21 @@
+from unittest.mock import AsyncMock
+
+import pytest
+
+from chainlit.data.storage_clients.base import BaseStorageClient
+from chainlit.user import User
+
+
+@pytest.fixture
+def mock_storage_client():
+    mock_client = AsyncMock(spec=BaseStorageClient)
+    mock_client.upload_file.return_value = {
+        "url": "https://example.com/test.txt",
+        "object_key": "test_user/test_element/test.txt",
+    }
+    return mock_client
+
+
+@pytest.fixture
+def test_user() -> User:
+    return User(identifier="test_user_identifier", metadata={})