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test_override_messages() — langchain Function Reference

Architecture documentation for the test_override_messages() function in test_overrides.py from the langchain codebase.

Function python LangChainCore Runnables

Entity Profile

Dependency Diagram

graph TD
  8dc43361_95ae_0d75_8bfb_49542eb0196f["test_override_messages()"]
  5e5133af_311a_09ab_c36c_5325b6843847["TestModelRequestOverride"]
  8dc43361_95ae_0d75_8bfb_49542eb0196f -->|defined in| 5e5133af_311a_09ab_c36c_5325b6843847
  style 8dc43361_95ae_0d75_8bfb_49542eb0196f fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py lines 81–103

    def test_override_messages(self) -> None:
        """Test overriding messages list."""
        model = GenericFakeChatModel(messages=iter([AIMessage(content="Hello")]))
        original_messages: list[AnyMessage] = [HumanMessage("Hi")]
        new_messages: list[AnyMessage] = [HumanMessage("Hello"), AIMessage("Hi there")]

        original_request = ModelRequest(
            model=model,
            system_message=None,
            messages=original_messages,
            tool_choice=None,
            tools=[],
            response_format=None,
            state=AgentState(messages=[]),
            runtime=None,
        )

        new_request = original_request.override(messages=new_messages)

        assert new_request.messages == new_messages
        assert original_request.messages == original_messages
        assert len(new_request.messages) == 2
        assert len(original_request.messages) == 1

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Defined In

Source

Frequently Asked Questions

What does test_override_messages() do?
test_override_messages() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py.
Where is test_override_messages() defined?
test_override_messages() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py at line 81.

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