docstr: Test computation of ymarks data for single ymark.
  
          
docstr_tok: ["Test","computation","of","ymarks","data","for","single","ymark","."]
code: def test_get_ymarks_data(self):
      """Test computation of ymarks data for single ymark."""
  
      self.plot.ymarks = 1
      test_mark_data = dict(radius=self.ann_bins["o1"][1])
      cmp_mark_data = self.plot._get_ymarks_data(["o1"], self.ann_bins)
  
      self.assertEqual(test_mark_data, cmp_mark_data)
  
imports: from itertools import product
  import numpy
  from bokeh.models import ColorBar
  from holoviews.core.spaces import HoloMap
  from holoviews.element.raster import HeatMap
  from holoviews.plotting.bokeh import RadialHeatMapPlot
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 13 for calling the BokehRadialHeatMapPlotTests obj's underlying member method code with example usage: obj.test_get_ymarks_data() without return types