test_override_preserves_identity() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_overrides.py lines 387–410

    def test_override_preserves_identity(self) -> None:
        """Test that unchanged attributes maintain object identity."""

        @tool
        def test_tool(x: int) -> str:
            """A test tool."""
            return f"Result: {x}"

        tool_call = ToolCall(name="test_tool", args={"x": 5}, id="1", type="tool_call")
        state = AgentState[Any](messages=[])

        original_request = ToolCallRequest(
            tool_call=tool_call,
            tool=test_tool,
            state=state,
            runtime=Mock(),
        )

        new_call = ToolCall(name="test_tool", args={"x": 10}, id="1", type="tool_call")
        new_request = original_request.override(tool_call=new_call)

        # Unchanged objects should be the same instance
        assert new_request.tool is test_tool
        assert new_request.state is state