code: def test_point_size_op(self):
      points = Points(
          [(0, 0, 1), (0, 1, 4), (0, 2, 8)], vdims="size"
      ).opts(s="size")
      plot = mpl_renderer.get_plot(points)
      artist = plot.handles["artist"]
      self.assertEqual(artist.get_sizes(), np.array([1, 4, 8]))
  
imports: import matplotlib.pyplot
  import numpy
  import pytest
  from holoviews.core.options import AbbreviatedException
  from holoviews.core.overlay import NdOverlay
  from holoviews.core.spaces import HoloMap
  from holoviews.element import Points
  from ..utils import ParamLogStream
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 29 for calling the TestPointPlot obj's underlying member method code with example usage: obj.test_point_size_op() without return types