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test_primary_model_succeeds_async() — langchain Function Reference

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

Function python LangChainCore LanguageModelBase calls 1

Entity Profile

Dependency Diagram

graph TD
  2d0593e6_dcee_701d_a4b8_eedda059ff48["test_primary_model_succeeds_async()"]
  c6372e75_e4e3_ed20_8230_4be219762f0f["test_model_fallback.py"]
  2d0593e6_dcee_701d_a4b8_eedda059ff48 -->|defined in| c6372e75_e4e3_ed20_8230_4be219762f0f
  87e5ea8c_f6ab_eab3_8968_7c2261cefbeb["_make_request()"]
  2d0593e6_dcee_701d_a4b8_eedda059ff48 -->|calls| 87e5ea8c_f6ab_eab3_8968_7c2261cefbeb
  style 2d0593e6_dcee_701d_a4b8_eedda059ff48 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py lines 160–177

async def test_primary_model_succeeds_async() -> None:
    """Test async version - primary model is used when it succeeds."""
    primary_model = GenericFakeChatModel(messages=iter([AIMessage(content="primary response")]))
    fallback_model = GenericFakeChatModel(messages=iter([AIMessage(content="fallback response")]))

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

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

    response = await middleware.awrap_model_call(request, mock_handler)

    assert isinstance(response, ModelResponse)
    assert response.result[0].content == "primary response"

Domain

Subdomains

Defined In

Calls

Source

Frequently Asked Questions

What does test_primary_model_succeeds_async() do?
test_primary_model_succeeds_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_primary_model_succeeds_async() defined?
test_primary_model_succeeds_async() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py at line 160.
What does test_primary_model_succeeds_async() call?
test_primary_model_succeeds_async() calls 1 function(s): _make_request.

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