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test_all_models_fail_async() — langchain Function Reference

Architecture documentation for the test_all_models_fail_async() function in test_model_fallback.py from the langchain codebase.

Function python LangChainCore LanguageModelBase calls 2

Entity Profile

Dependency Diagram

graph TD
  480a6110_51df_d0de_c692_ed27d4f5011e["test_all_models_fail_async()"]
  c6372e75_e4e3_ed20_8230_4be219762f0f["test_model_fallback.py"]
  480a6110_51df_d0de_c692_ed27d4f5011e -->|defined in| c6372e75_e4e3_ed20_8230_4be219762f0f
  87e5ea8c_f6ab_eab3_8968_7c2261cefbeb["_make_request()"]
  480a6110_51df_d0de_c692_ed27d4f5011e -->|calls| 87e5ea8c_f6ab_eab3_8968_7c2261cefbeb
  b6272a92_ada1_37f0_58c7_437cc1db0ff8["_agenerate()"]
  480a6110_51df_d0de_c692_ed27d4f5011e -->|calls| b6272a92_ada1_37f0_58c7_437cc1db0ff8
  style 480a6110_51df_d0de_c692_ed27d4f5011e fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py lines 245–272

async def test_all_models_fail_async() -> None:
    """Test async version - exception is raised when all models fail."""

    class AsyncAlwaysFailingModel(GenericFakeChatModel):
        @override
        async def _agenerate(
            self,
            messages: list[BaseMessage],
            stop: list[str] | None = None,
            run_manager: AsyncCallbackManagerForLLMRun | None = None,
            **kwargs: Any,
        ) -> ChatResult:
            msg = "Model failed"
            raise ValueError(msg)

    primary_model = AsyncAlwaysFailingModel(messages=iter([]))
    fallback_model = AsyncAlwaysFailingModel(messages=iter([]))

    middleware = ModelFallbackMiddleware(fallback_model)
    request = _make_request()
    request = request.override(model=primary_model)

    async def mock_handler(req: ModelRequest) -> ModelResponse:
        result = await req.model.ainvoke([])
        return ModelResponse(result=[result])

    with pytest.raises(ValueError, match="Model failed"):
        await middleware.awrap_model_call(request, mock_handler)

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Frequently Asked Questions

What does test_all_models_fail_async() do?
test_all_models_fail_async() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py.
Where is test_all_models_fail_async() defined?
test_all_models_fail_async() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py at line 245.
What does test_all_models_fail_async() call?
test_all_models_fail_async() calls 2 function(s): _agenerate, _make_request.

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