docstr: Test correct computation of a single annular label data point.
  
          
docstr_tok: ["Test","correct","computation","of","a","single","annular","label","data","point","."]
code: def test_get_ann_labels_data(self):
      """Test correct computation of a single annular label data point."""
  
      test_ann_data = dict(
          x=np.array(1),
          y=np.array(self.ann_bins["o1"][0] + 1),
          text=np.array("o1"),
          angle=[0],
      )
  
      cmp_ann_data = self.plot._get_ann_labels_data(
          ["o1"], self.ann_bins
      )
  
      self.assertEqual(test_ann_data, cmp_ann_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 10 for calling the BokehRadialHeatMapPlotTests obj's underlying member method code with example usage: obj.test_get_ann_labels_data() without return types