test_summarization_middleware_fraction_trigger_with_no_profile() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_summarization.py lines 969–985

def test_summarization_middleware_fraction_trigger_with_no_profile() -> None:
    """Test fractional trigger condition when profile data becomes unavailable."""
    middleware = SummarizationMiddleware(
        model=ProfileChatModel(),
        trigger=[("fraction", 0.5), ("messages", 100)],
        keep=("messages", 5),
    )

    # Test that when fractional condition can't be evaluated, other triggers still work
    messages: list[AnyMessage] = [HumanMessage(content=str(i)) for i in range(100)]

    # Mock _get_profile_limits to return None
    with patch.object(middleware, "_get_profile_limits", autospec=True, return_value=None):
        # Should still trigger based on message count
        state = AgentState[Any](messages=messages)
        result = middleware.before_model(state, Runtime())
        assert result is not None