code: def test_polygons_categorical_color_op(self):
      polygons = Polygons(
          [
              {("x", "y"): [(0, 0), (0, 1), (1, 0)], "color": "b"},
              {("x", "y"): [(1, 0), (1, 1), (0, 1)], "color": "a"},
          ],
          vdims="color",
      ).opts(color="color")
      plot = mpl_renderer.get_plot(polygons)
      artist = plot.handles["artist"]
      self.assertEqual(np.asarray(artist.get_array()), np.array([0, 1]))
      self.assertEqual(artist.get_clim(), (0, 1))
  
imports: import numpy
  import pytest
  from holoviews.core import NdOverlay
  from holoviews.core.options import AbbreviatedException
  from holoviews.core.spaces import HoloMap
  from holoviews.element import Contours, Path, Polygons
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 8 for calling the TestPolygonPlot obj's underlying member method code with example usage: obj.test_polygons_categorical_color_op() without return types