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test_single_handler_returns_unchanged() — langchain Function Reference

Architecture documentation for the test_single_handler_returns_unchanged() function in test_composition.py from the langchain codebase.

Function python LangChainCore Runnables

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Dependency Diagram

graph TD
  a2281178_3cbf_7b38_b7bb_cca761dfac12["test_single_handler_returns_unchanged()"]
  f1e766c6_5a64_9e6c_f2a8_d41c64f6f142["TestChainModelCallHandlers"]
  a2281178_3cbf_7b38_b7bb_cca761dfac12 -->|defined in| f1e766c6_5a64_9e6c_f2a8_d41c64f6f142
  style a2281178_3cbf_7b38_b7bb_cca761dfac12 fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_composition.py lines 48–59

    def test_single_handler_returns_unchanged(self) -> None:
        """Test that single handler is wrapped to normalize output."""

        def handler(
            request: ModelRequest, base_handler: Callable[[ModelRequest], ModelResponse]
        ) -> ModelResponse:
            return base_handler(request)

        result = _chain_model_call_handlers([handler])
        # Result is wrapped to normalize, so it won't be identical
        assert result is not None
        assert callable(result)

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Frequently Asked Questions

What does test_single_handler_returns_unchanged() do?
test_single_handler_returns_unchanged() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_composition.py.
Where is test_single_handler_returns_unchanged() defined?
test_single_handler_returns_unchanged() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_composition.py at line 48.

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