code: def test_spikes_color_op(self):
      spikes = Spikes(
          [(0, 0, "#000000"), (0, 1, "#FF0000"), (0, 2, "#00FF00")],
          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]]),
      )
  
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 11 for calling the TestSpikesPlot obj's underlying member method code with example usage: obj.test_spikes_color_op() without return types