code: def test_empty_send_state():
      w = SimpleWidget()
      w.send_state([])
      assert w.comm.messages == []
  
file_path: catboost/contrib/python/ipywidgets/py3/ipywidgets/widgets/tests/test_send_state.py
imports: from traitlets import Bool, Tuple, List
  from .utils import setup, teardown, DummyComm
  from ipywidgets.widgets.widget import Widget
  from ipywidgets._version import __control_protocol_version__
label_desc: Use image node_id 1 for calling a global function with example usage: test_empty_send_state() without return types