code: def test_graph_inspection_policy_nodes(self):
      plot = bokeh_renderer.get_plot(self.graph)
      renderer = plot.handles["glyph_renderer"]
      hover = plot.handles["hover"]
      self.assertIsInstance(
          renderer.inspection_policy, NodesAndLinkedEdges
      )
      self.assertEqual(hover.tooltips, [("index", "@{index_hover}")])
      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 5 for calling the TestBokehGraphPlot obj's underlying member method code with example usage: obj.test_graph_inspection_policy_nodes() without return types