code: def test_spikes_line_width_op(self):
      spikes = Spikes(
          [(0, 0, 1), (0, 1, 4), (0, 2, 8)], vdims=["y", "line_width"]
      ).opts(line_width="line_width")
      plot = bokeh_renderer.get_plot(spikes)
      cds = plot.handles["cds"]
      glyph = plot.handles["glyph"]
      self.assertEqual(cds.data["line_width"], np.array([1, 4, 8]))
      self.assertEqual(
          property_to_dict(glyph.line_width), {"field": "line_width"}
      )
  
imports: import datetime
  import numpy
  from bokeh.models import CategoricalColorMapper, LinearColorMapper
  from holoviews.core import NdOverlay
  from holoviews.element import Spikes
  from holoviews.plotting.bokeh.util import property_to_dict
  from ..utils import ParamLogStream
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 23 for calling the TestSpikesPlot obj's underlying member method code with example usage: obj.test_spikes_line_width_op() without return types