code: def test_heatmap_colormapping(self):
      hm = HeatMap([(1, 1, 1), (2, 2, 0)])
      self._test_colormapping(hm, 2)
  
file_path: holoviews/holoviews/tests/plotting/bokeh/test_heatmapplot.py
imports: import numpy
  from bokeh.models import FactorRange, HoverTool, Range1d
  from holoviews.element import HeatMap, Image, Points
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 4 for calling the TestHeatMapPlot obj's underlying member method code with example usage: obj.test_heatmap_colormapping() without return types