test_tool_retry_failing_tool_raises() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_tool_retry.py lines 219–247

def test_tool_retry_failing_tool_raises() -> None:
    """Test ToolRetryMiddlewarewith on_failure='error' re-raises exception."""
    model = FakeToolCallingModel(
        tool_calls=[
            [ToolCall(name="failing_tool", args={"value": "test"}, id="1")],
            [],
        ]
    )

    retry = ToolRetryMiddleware(
        max_retries=2,
        initial_delay=0.01,
        jitter=False,
        on_failure="error",
    )

    agent = create_agent(
        model=model,
        tools=[failing_tool],
        middleware=[retry],
        checkpointer=InMemorySaver(),
    )

    # Should raise the ValueError from the tool
    with pytest.raises(ValueError, match="Failed: test"):
        agent.invoke(
            {"messages": [HumanMessage("Use failing tool")]},
            {"configurable": {"thread_id": "test"}},
        )