code: def test_polygons_color_op_update(self):
      polygons = HoloMap(
          {
              0: Polygons(
                  [
                      {
                          ("x", "y"): [(0, 0), (0, 1), (1, 0)],
                          "color": "green",
                      },
                      {
                          ("x", "y"): [(1, 0), (1, 1), (0, 1)],
                          "color": "red",
                      },
                  ],
                  vdims="color",
              ),
              1: Polygons(
                  [
                      {
                          ("x", "y"): [(0, 0), (0, 1), (1, 0)],
                          "color": "blue",
                      },
                      {
                          ("x", "y"): [(1, 0), (1, 1), (0, 1)],
                          "color": "green",
                      },
                  ],
                  vdims="color",
              ),
          }
      ).opts(color="color")
      plot = mpl_renderer.get_plot(polygons)
      artist = plot.handles["artist"]
      colors = np.array([[0, 0.501961, 0, 1], [1, 0, 0, 1]])
      self.assertEqual(artist.get_facecolors(), colors)
      plot.update((1,))
      colors = np.array([[0, 0, 1, 1], [0, 0.501961, 0, 1]])
      self.assertEqual(artist.get_facecolors(), colors)
  
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 5 for calling the TestPolygonPlot obj's underlying member method code with example usage: obj.test_polygons_color_op_update() without return types