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test_old_pattern_2_two_params() — langchain Function Reference

Architecture documentation for the test_old_pattern_2_two_params() function in test_middleware_backwards_compat.py from the langchain codebase.

Function python LangChainCore ApiManagement

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Dependency Diagram

graph TD
  9cb1ae4c_8e08_4930_0158_96edb22ea8ae["test_old_pattern_2_two_params()"]
  74d2d22f_07ae_c5bb_33c3_7da58e2da5a0["test_middleware_backwards_compat.py"]
  9cb1ae4c_8e08_4930_0158_96edb22ea8ae -->|defined in| 74d2d22f_07ae_c5bb_33c3_7da58e2da5a0
  style 9cb1ae4c_8e08_4930_0158_96edb22ea8ae fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py lines 165–173

def test_old_pattern_2_two_params(fake_model: GenericFakeChatModel) -> None:
    """Old pattern 2: AgentMiddleware[StateT, ContextT] - 2 params."""
    agent = create_agent(
        model=fake_model,
        middleware=[OldStyleMiddleware2()],
    )
    result = agent.invoke({"messages": [HumanMessage(content="hi")]})
    assert "messages" in result
    assert len(result["messages"]) >= 1

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Frequently Asked Questions

What does test_old_pattern_2_two_params() do?
test_old_pattern_2_two_params() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py.
Where is test_old_pattern_2_two_params() defined?
test_old_pattern_2_two_params() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py at line 165.

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