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test_async_both_commands_additive_messages() — langchain Function Reference

Architecture documentation for the test_async_both_commands_additive_messages() function in test_wrap_model_call_state_update.py from the langchain codebase.

Function python LangChainCore LanguageModelBase

Entity Profile

Dependency Diagram

graph TD
  27773a64_cc86_16f8_6afe_6a894b80f58b["test_async_both_commands_additive_messages()"]
  0f39b70e_2926_951e_853d_3344387750a6["TestAsyncComposition"]
  27773a64_cc86_16f8_6afe_6a894b80f58b -->|defined in| 0f39b70e_2926_951e_853d_3344387750a6
  style 27773a64_cc86_16f8_6afe_6a894b80f58b fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call_state_update.py lines 688–733

    async def test_async_both_commands_additive_messages(self) -> None:
        """Async: both inner and outer command messages are added alongside model."""

        class OuterMiddleware(AgentMiddleware):
            async def awrap_model_call(
                self,
                request: ModelRequest,
                handler: Callable[[ModelRequest], Awaitable[ModelResponse]],
            ) -> ExtendedModelResponse:
                response = await handler(request)
                return ExtendedModelResponse(
                    model_response=response,
                    command=Command(
                        update={"messages": [HumanMessage(content="Outer msg", id="outer")]}
                    ),
                )

        class InnerMiddleware(AgentMiddleware):
            async def awrap_model_call(
                self,
                request: ModelRequest,
                handler: Callable[[ModelRequest], Awaitable[ModelResponse]],
            ) -> ExtendedModelResponse:
                response = await handler(request)
                return ExtendedModelResponse(
                    model_response=response,
                    command=Command(
                        update={"messages": [HumanMessage(content="Inner msg", id="inner")]}
                    ),
                )

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

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

        # All messages additive: model + inner + outer
        messages = result["messages"]
        assert len(messages) == 4
        assert messages[0].content == "Hi"
        assert messages[1].content == "Hello"
        assert messages[2].content == "Inner msg"
        assert messages[3].content == "Outer msg"

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Frequently Asked Questions

What does test_async_both_commands_additive_messages() do?
test_async_both_commands_additive_messages() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call_state_update.py.
Where is test_async_both_commands_additive_messages() defined?
test_async_both_commands_additive_messages() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call_state_update.py at line 688.

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