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test_primary_model_succeeds() — langchain Function Reference

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

Function python LangChainCore LanguageModelBase calls 1

Entity Profile

Dependency Diagram

graph TD
  12e2c500_f0e9_d9b0_f5b5_49bdbf7c06f5["test_primary_model_succeeds()"]
  c6372e75_e4e3_ed20_8230_4be219762f0f["test_model_fallback.py"]
  12e2c500_f0e9_d9b0_f5b5_49bdbf7c06f5 -->|defined in| c6372e75_e4e3_ed20_8230_4be219762f0f
  87e5ea8c_f6ab_eab3_8968_7c2261cefbeb["_make_request()"]
  12e2c500_f0e9_d9b0_f5b5_49bdbf7c06f5 -->|calls| 87e5ea8c_f6ab_eab3_8968_7c2261cefbeb
  style 12e2c500_f0e9_d9b0_f5b5_49bdbf7c06f5 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py lines 45–62

def test_primary_model_succeeds() -> None:
    """Test that 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)

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

    response = middleware.wrap_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() do?
test_primary_model_succeeds() 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() defined?
test_primary_model_succeeds() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_model_fallback.py at line 45.
What does test_primary_model_succeeds() call?
test_primary_model_succeeds() calls 1 function(s): _make_request.

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