code: def test_quadmesh_nodata_uint(self):
      xs = [0, 1, 2]
      ys = [2, 1, 0]
      data = np.array([[0, 1, 2], [3, 4, 5], [6, 7, 8]], dtype="uint32")
      flattened = np.array([6, 3, np.nan, 7, 4, 1, 8, 5, 2])
      qmesh = QuadMesh((xs, ys, data)).opts(nodata=0)
      plot = bokeh_renderer.get_plot(qmesh)
      source = plot.handles["source"]
      self.assertEqual(source.data["z"], flattened)
  
file_path: holoviews/holoviews/tests/plotting/bokeh/test_quadmeshplot.py
imports: import numpy
  from bokeh.models import ColorBar
  from holoviews.element import Image, QuadMesh
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 6 for calling the TestQuadMeshPlot obj's underlying member method code with example usage: obj.test_quadmesh_nodata_uint() without return types