code: def setUp(self):
      import holoviews.plotting.plotly  # noqa
  
      super().setUp()
      self._backend = Store.current_backend
      Store.set_current_backend("plotly")
  
imports: from unittest import skip, skipIf
  import pandas
  import holoviews
  from holoviews.core.options import Cycle, Store
  from holoviews.element import ErrorBars, Points, Rectangles, Table, VSpan
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.plotting.util import linear_gradient
  from holoviews.selection import link_selections
  from holoviews.streams import SelectionXY
label_desc: Use image node_id 1 for calling the TestLinkSelectionsPlotly obj's underlying member method code with example usage: obj.setUp() without return types