code: def test_histogram_line_color_op(self):
      histogram = Histogram(
          [(0, 0, "#000"), (0, 1, "#F00"), (0, 2, "#0F0")],
          vdims=["y", "color"],
      ).opts(line_color="color")
      plot = bokeh_renderer.get_plot(histogram)
      cds = plot.handles["cds"]
      glyph = plot.handles["glyph"]
      self.assertEqual(
          cds.data["line_color"], np.array(["#000", "#F00", "#0F0"])
      )
      self.assertNotEqual(
          property_to_dict(glyph.fill_color), {"field": "line_color"}
      )
      self.assertEqual(
          property_to_dict(glyph.line_color), {"field": "line_color"}
      )
  
imports: import datetime
  import numpy
  from bokeh.models import CategoricalColorMapper, DatetimeAxis, LinearColorMapper
  from holoviews.core.overlay import NdOverlay
  from holoviews.element import Dataset, Histogram, Image, Points
  from holoviews.operation import histogram
  from holoviews.plotting.bokeh.util import property_to_dict
  from ...utils import LoggingComparisonTestCase
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 16 for calling the TestSideHistogramPlot obj's underlying member method code with example usage: obj.test_histogram_line_color_op() without return types