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test_middleware_handles_none_system_message() — langchain Function Reference

Architecture documentation for the test_middleware_handles_none_system_message() function in test_system_message.py from the langchain codebase.

Function python LangChainCore MessageInterface calls 1

Entity Profile

Dependency Diagram

graph TD
  d17a013b_cdc8_048c_b2e8_79d48b4f944a["test_middleware_handles_none_system_message()"]
  71806697_b367_06d3_c3dc_8764efaf8550["TestDynamicSystemPromptMiddleware"]
  d17a013b_cdc8_048c_b2e8_79d48b4f944a -->|defined in| 71806697_b367_06d3_c3dc_8764efaf8550
  56f7d1ae_98db_01a6_dc7e_786fe86dd0c4["_make_request()"]
  d17a013b_cdc8_048c_b2e8_79d48b4f944a -->|calls| 56f7d1ae_98db_01a6_dc7e_786fe86dd0c4
  style d17a013b_cdc8_048c_b2e8_79d48b4f944a fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/test_system_message.py lines 819–833

    def test_middleware_handles_none_system_message(self) -> None:
        """Test middleware creating new SystemMessage when none exists."""

        def create_if_none_middleware(request: ModelRequest) -> SystemMessage:
            """Create a system message if none exists."""
            if request.system_message is None:
                return SystemMessage(content="Default system prompt")
            return request.system_message

        request = _make_request(system_message=None)
        new_system_message = create_if_none_middleware(request)

        assert isinstance(new_system_message, SystemMessage)
        assert len(new_system_message.content_blocks) == 1
        assert new_system_message.content_blocks[0].get("text") == "Default system prompt"

Domain

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Defined In

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Source

Frequently Asked Questions

What does test_middleware_handles_none_system_message() do?
test_middleware_handles_none_system_message() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/test_system_message.py.
Where is test_middleware_handles_none_system_message() defined?
test_middleware_handles_none_system_message() is defined in libs/langchain_v1/tests/unit_tests/agents/test_system_message.py at line 819.
What does test_middleware_handles_none_system_message() call?
test_middleware_handles_none_system_message() calls 1 function(s): _make_request.

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