code: def test_hex_tiles_count_aggregation(self):
      tiles = HexTiles([(0, 0), (0.5, 0.5), (-0.5, -0.5), (-0.4, -0.4)])
      binned = hex_binning(tiles, gridsize=3)
      expected = HexTiles(
          [(0, 0, 1), (2, -1, 1), (-2, 1, 2)],
          kdims=[
              Dimension("x", range=(-0.5, 0.5)),
              Dimension("y", range=(-0.5, 0.5)),
          ],
          vdims="Count",
      )
      self.assertEqual(binned, expected)
  
imports: import numpy
  from holoviews.core import Dimension
  from holoviews.element import HexTiles
  from holoviews.plotting.bokeh.hex_tiles import hex_binning
  from holoviews.plotting.bokeh.util import property_to_dict
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 1 for calling the TestHexTilesOperation obj's underlying member method code with example usage: obj.test_hex_tiles_count_aggregation() without return types