code: def test_spikes_padding_datetime_nonsquare(self):
      spikes = Spikes(
          [np.datetime64("2016-04-0%d" % i) for i in range(1, 4)]
      ).opts(padding=0.1, width=600)
      plot = bokeh_renderer.get_plot(spikes)
      x_range = plot.handles["x_range"]
      self.assertEqual(
          x_range.start, np.datetime64("2016-03-31T21:36:00.000000000")
      )
      self.assertEqual(
          x_range.end, np.datetime64("2016-04-03T02:24:00.000000000")
      )
  
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 13 for calling the TestSpikesPlot obj's underlying member method code with example usage: obj.test_spikes_padding_datetime_nonsquare() without return types