code: def test_polygons_linear_color_op(self):
      polygons = Polygons(
          [
              {("x", "y"): [(0, 0), (0, 1), (1, 0)], "color": 7},
              {("x", "y"): [(1, 0), (1, 1), (0, 1)], "color": 3},
          ],
          vdims="color",
      ).opts(color="color")
      plot = bokeh_renderer.get_plot(polygons)
      cds = plot.handles["source"]
      glyph = plot.handles["glyph"]
      cmapper = plot.handles["color_color_mapper"]
      self.assertEqual(glyph.line_color, "black")
      self.assertEqual(
          property_to_dict(glyph.fill_color),
          {"field": "color", "transform": cmapper},
      )
      self.assertEqual(cds.data["color"], np.array([7, 3]))
      self.assertIsInstance(cmapper, LinearColorMapper)
      self.assertEqual(cmapper.low, 3)
      self.assertEqual(cmapper.high, 7)
  
imports: import datetime
  import numpy
  import pandas
  from bokeh.models import CategoricalColorMapper, LinearColorMapper
  from holoviews.core import HoloMap, NdOverlay
  from holoviews.core.options import Cycle
  from holoviews.element import Contours, Path, Polygons
  from holoviews.plotting.bokeh.util import property_to_dict
  from holoviews.streams import PolyDraw
  from holoviews.util.transform import dim
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 10 for calling the TestPolygonPlot obj's underlying member method code with example usage: obj.test_polygons_linear_color_op() without return types