code: def test_spikes_color_op_update(self):
      spikes = HoloMap(
          {
              0: Spikes(
                  [
                      (0, 0, "#000000"),
                      (0, 1, "#FF0000"),
                      (0, 2, "#00FF00"),
                  ],
                  vdims=["y", "color"],
              ),
              1: Spikes(
                  [
                      (0, 0, "#FF0000"),
                      (0, 1, "#00FF00"),
                      (0, 2, "#0000FF"),
                  ],
                  vdims=["y", "color"],
              ),
          }
      ).opts(color="color")
      plot = mpl_renderer.get_plot(spikes)
      artist = plot.handles["artist"]
      self.assertEqual(
          artist.get_edgecolors(),
          np.array([[0, 0, 0, 1], [1, 0, 0, 1], [0, 1, 0, 1]]),
      )
      plot.update((1,))
      self.assertEqual(
          artist.get_edgecolors(),
          np.array([[1, 0, 0, 1], [0, 1, 0, 1], [0, 0, 1, 1]]),
      )
  
imports: 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 Spikes
  from ..utils import ParamLogStream
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 12 for calling the TestSpikesPlot obj's underlying member method code with example usage: obj.test_spikes_color_op_update() without return types