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test_old_pattern_3_explicit_none() — langchain Function Reference

Architecture documentation for the test_old_pattern_3_explicit_none() function in test_middleware_backwards_compat.py from the langchain codebase.

Function python LangChainCore Runnables

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Dependency Diagram

graph TD
  9af795af_6177_af61_e509_b2b6f9021f0e["test_old_pattern_3_explicit_none()"]
  74d2d22f_07ae_c5bb_33c3_7da58e2da5a0["test_middleware_backwards_compat.py"]
  9af795af_6177_af61_e509_b2b6f9021f0e -->|defined in| 74d2d22f_07ae_c5bb_33c3_7da58e2da5a0
  style 9af795af_6177_af61_e509_b2b6f9021f0e 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 176–184

def test_old_pattern_3_explicit_none(fake_model: GenericFakeChatModel) -> None:
    """Old pattern 3: Explicit None context."""
    agent = create_agent(
        model=fake_model,
        middleware=[OldStyleMiddleware3()],
    )
    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_3_explicit_none() do?
test_old_pattern_3_explicit_none() 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_3_explicit_none() defined?
test_old_pattern_3_explicit_none() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py at line 176.

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