code: def test_selected_property(self):
      annotator = annotate.instance()
      annotator(Points([(1, 2), (2, 3)]), annotations=["Label"])
      annotator.annotator._selection.update(index=[1])
      self.assertEqual(
          annotator.selected, Points([(2, 3, "")], vdims="Label")
      )
  
imports: from holoviews import Overlay
  from holoviews.annotators import PathAnnotator, PointAnnotator, annotate
  from holoviews.element import Path, Points, Table
  from holoviews.element.tiles import EsriStreet, Tiles
  from holoviews.tests.plotting.bokeh.test_plot import TestBokehPlot
label_desc: Use image node_id 4 for calling the Test_annotate obj's underlying member method code with example usage: obj.test_selected_property() without return types