test_document_metadata_with_lc_key_escaped() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/load/test_serializable.py lines 409–423

    def test_document_metadata_with_lc_key_escaped(self) -> None:
        """Test that `Document` metadata with `'lc'` key round-trips as plain dict."""
        # User data that looks like an LC constructor - should be escaped, not executed
        suspicious_metadata = {"lc": 1, "type": "constructor", "id": ["some", "module"]}
        doc = Document(page_content="test", metadata=suspicious_metadata)

        # Serialize - should escape the metadata
        serialized = dumpd(doc)
        assert serialized["kwargs"]["metadata"] == {
            "__lc_escaped__": suspicious_metadata
        }

        # Deserialize - should restore original metadata as plain dict
        loaded = load(serialized, allowed_objects=[Document])
        assert loaded.metadata == suspicious_metadata  # Plain dict, not instantiated