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test_old_pattern_5_decorator() — langchain Function Reference

Architecture documentation for the test_old_pattern_5_decorator() function in test_middleware_backwards_compat.py from the langchain codebase.

Function python LangChainCore ApiManagement

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Dependency Diagram

graph TD
  93f6d879_7ea3_b6b3_6bb9_b015bed65c4e["test_old_pattern_5_decorator()"]
  74d2d22f_07ae_c5bb_33c3_7da58e2da5a0["test_middleware_backwards_compat.py"]
  93f6d879_7ea3_b6b3_6bb9_b015bed65c4e -->|defined in| 74d2d22f_07ae_c5bb_33c3_7da58e2da5a0
  style 93f6d879_7ea3_b6b3_6bb9_b015bed65c4e 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 202–210

def test_old_pattern_5_decorator(fake_model: GenericFakeChatModel) -> None:
    """Old pattern 5: Decorator-based middleware."""
    agent = create_agent(
        model=fake_model,
        middleware=[old_style_decorator],
    )
    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_5_decorator() do?
test_old_pattern_5_decorator() 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_5_decorator() defined?
test_old_pattern_5_decorator() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py at line 202.

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