code: def test_point_color_op(self):
      points = Points(
          [(0, 0, "#000000"), (0, 1, "#FF0000"), (0, 2, "#00FF00")],
          vdims="color",
      ).opts(color="color")
      plot = mpl_renderer.get_plot(points)
      artist = plot.handles["artist"]
      self.assertEqual(
          artist.get_facecolors(),
          np.array([[0, 0, 0, 1], [1, 0, 0, 1], [0, 1, 0, 1]]),
      )
  
imports: import matplotlib.pyplot
  import numpy
  import pytest
  from holoviews.core.options import AbbreviatedException
  from holoviews.core.overlay import NdOverlay
  from holoviews.core.spaces import HoloMap
  from holoviews.element import Points
  from ..utils import ParamLogStream
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 19 for calling the TestPointPlot obj's underlying member method code with example usage: obj.test_point_color_op() without return types