code: def test_slope(self):
      hspan = Slope(2, 10)
      plot = bokeh_renderer.get_plot(hspan)
      slope = plot.handles["glyph"]
      self.assertEqual(slope.gradient, 2)
      self.assertEqual(slope.y_intercept, 10)
  
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 1 for calling the TestSlopePlot obj's underlying member method code with example usage: obj.test_slope() without return types