test_convert_to_openai_messages_tool_use_unicode() — langchain Function Reference

Source Code

libs/core/tests/unit_tests/messages/test_utils.py lines 1226–1250

def test_convert_to_openai_messages_tool_use_unicode() -> None:
    """Test that Unicode characters in tool call args are preserved correctly."""
    messages = [
        AIMessage(
            content=[
                {
                    "type": "tool_use",
                    "id": "123",
                    "name": "create_customer",
                    "input": {"customer_name": "你好啊集团"},
                }
            ]
        )
    ]
    result = convert_to_openai_messages(messages, text_format="block")
    assert result[0]["tool_calls"][0]["type"] == "function"
    assert result[0]["tool_calls"][0]["id"] == "123"
    assert result[0]["tool_calls"][0]["function"]["name"] == "create_customer"
    # Ensure Unicode characters are preserved, not escaped as \\uXXXX
    arguments_str = result[0]["tool_calls"][0]["function"]["arguments"]
    parsed_args = json.loads(arguments_str)
    assert parsed_args["customer_name"] == "你好啊集团"
    # Also ensure the raw JSON string contains Unicode, not escaped sequences
    assert "你好啊集团" in arguments_str
    assert "\\u4f60" not in arguments_str  # Should not contain escaped Unicode