code: def test_graph_selection_policy_edges(self):
      plot = bokeh_renderer.get_plot(
          self.graph.opts(selection_policy="edges")
      )
      renderer = plot.handles["glyph_renderer"]
      hover = plot.handles["hover"]
      self.assertIsInstance(
          renderer.selection_policy, EdgesAndLinkedNodes
      )
      self.assertIn(renderer, hover.renderers)
  
imports: import numpy
  from bokeh.models import EdgesAndLinkedNodes, NodesAndLinkedEdges, NodesOnly, Patches
  from bokeh.models.mappers import CategoricalColorMapper, LinearColorMapper
  from holoviews.core.data import Dataset
  from holoviews.element import Chord, Graph, Nodes, TriMesh, VLine, circular_layout
  from holoviews.plotting.bokeh.util import property_to_dict
  from holoviews.util.transform import dim
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 10 for calling the TestBokehGraphPlot obj's underlying member method code with example usage: obj.test_graph_selection_policy_edges() without return types