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test_passthrough_middleware() — langchain Function Reference

Architecture documentation for the test_passthrough_middleware() function in test_wrap_model_call.py from the langchain codebase.

Function python LangChainCore LanguageModelBase

Entity Profile

Dependency Diagram

graph TD
  2d009756_8b41_9e01_c5bf_4891a0962428["test_passthrough_middleware()"]
  9e73d5df_d4b0_2065_d8b9_d39fc190f3f0["TestBasicWrapModelCall"]
  2d009756_8b41_9e01_c5bf_4891a0962428 -->|defined in| 9e73d5df_d4b0_2065_d8b9_d39fc190f3f0
  style 2d009756_8b41_9e01_c5bf_4891a0962428 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py lines 39–56

    def test_passthrough_middleware(self) -> None:
        """Test middleware that simply passes through without modification."""

        class PassthroughMiddleware(AgentMiddleware):
            def wrap_model_call(
                self,
                request: ModelRequest,
                handler: Callable[[ModelRequest], ModelResponse],
            ) -> ModelCallResult:
                return handler(request)

        model = GenericFakeChatModel(messages=iter([AIMessage(content="Hello")]))
        agent = create_agent(model=model, middleware=[PassthroughMiddleware()])

        result = agent.invoke({"messages": [HumanMessage("Hi")]})

        assert len(result["messages"]) == 2
        assert result["messages"][1].content == "Hello"

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Defined In

Source

Frequently Asked Questions

What does test_passthrough_middleware() do?
test_passthrough_middleware() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py.
Where is test_passthrough_middleware() defined?
test_passthrough_middleware() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py at line 39.

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