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test_model_request_preserves_context_type() — langchain Function Reference

Architecture documentation for the test_model_request_preserves_context_type() function in test_middleware_typing.py from the langchain codebase.

Function python LangChainCore LanguageModelBase

Entity Profile

Dependency Diagram

graph TD
  8391aa5b_1592_0e6a_4127_9ccf2839737c["test_model_request_preserves_context_type()"]
  689eac1f_5845_440c_f60b_988968e02ee6["test_middleware_typing.py"]
  8391aa5b_1592_0e6a_4127_9ccf2839737c -->|defined in| 689eac1f_5845_440c_f60b_988968e02ee6
  style 8391aa5b_1592_0e6a_4127_9ccf2839737c fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_typing.py lines 373–386

def test_model_request_preserves_context_type() -> None:
    """Test that ModelRequest.override() preserves ContextT."""
    request: ModelRequest[UserContext] = ModelRequest(
        model=None,  # type: ignore[arg-type]
        messages=[HumanMessage(content="test")],
        runtime=None,
    )

    # Override should preserve the type parameter
    new_request: ModelRequest[UserContext] = request.override(
        messages=[HumanMessage(content="updated")]
    )

    assert type(request) is type(new_request)

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Defined In

Source

Frequently Asked Questions

What does test_model_request_preserves_context_type() do?
test_model_request_preserves_context_type() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_typing.py.
Where is test_model_request_preserves_context_type() defined?
test_model_request_preserves_context_type() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_typing.py at line 373.

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