code: def test_coloring_hline(self):
      hlines = HLines({"y": [1, 2, 3]})
      hlines = hlines.opts(
          alpha=hv.dim("y").norm(),
          line_color="red",
          line_dash=hv.dim("y").bin([0, 1.5, 3], ["dashed", "solid"]),
      )
  
      plot = hv.renderer("bokeh").get_plot(hlines)
      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 TestHVLinesPlot obj's underlying member method code with example usage: obj.test_coloring_hline() without return types