def METHOD_NAME(convex_hull_decorator):
    node = SceneNode()
    node.addDecorator(NonPrintingDecorator())
    with patch("UM.Application.Application.getInstance", MagicMock(return_value=mocked_application)):
        convex_hull_decorator.setNode(node)
    assert convex_hull_decorator.getConvexHullHead() is None