test_setattr_system_prompt_deprecated() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/test_system_message.py lines 224–249

    def test_setattr_system_prompt_deprecated(
        self, new_value: str | None, *, should_be_none: bool
    ) -> None:
        """Test that setting system_prompt via setattr raises deprecation warning."""
        model = GenericFakeChatModel(messages=iter([AIMessage(content="Hello")]))

        request = ModelRequest(
            model=model,
            system_message=SystemMessage(content="Original") if not should_be_none else None,
            messages=[],
            tool_choice=None,
            tools=[],
            response_format=None,
            state=AgentState(messages=[]),
            runtime=None,
        )

        with pytest.warns(DeprecationWarning, match="system_prompt is deprecated"):
            request.system_prompt = new_value  # type: ignore[misc]

        if should_be_none:
            assert request.system_message is None
            assert request.system_prompt is None
        else:
            assert isinstance(request.system_message, SystemMessage)
            assert request.system_message.content_blocks[0].get("text") == new_value