code: def test_coloring_hline(self):
      hspans = HSpans({"y0": [1, 3, 5], "y1": [2, 4, 6]}).opts(
          alpha=hv.dim("y0").norm(),
          line_color="red",
          line_dash=hv.dim("y1").bin([0, 3, 6], ["dashed", "solid"]),
      )
  
      plot = hv.renderer("bokeh").get_plot(hspans)
      assert plot.handles["glyph"].line_color == "red"
  
      data = plot.handles["glyph_renderer"].data_source.data
      np.testing.assert_allclose(data["alpha"], [0, 0.5, 1])
      assert data["line_dash"] == ["dashed", "solid", "solid"]
  
imports: import unittest
  import numpy
  import holoviews
  from holoviews.element import Arrow, HLine, HLines, HSpan, HSpans, Labels, Slope, Text, VLine, VLines, VSpan, VSpans
  from holoviews.plotting.bokeh.util import bokeh32, bokeh33
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 12 for calling the TestHVSpansPlot obj's underlying member method code with example usage: obj.test_coloring_hline() without return types