code: def test_labels_size(self):
      labels = Labels([(0, 3, 0), (0, 2, 1), (0, 1, 1)]).opts(size="y")
      state = self._get_plot_state(labels)
      self.assertEqual(
          state["data"][0]["textfont"]["size"], np.array([3, 2, 1])
      )
  
imports: import numpy
  from holoviews.core.options import Cycle
  from holoviews.core.spaces import HoloMap
  from holoviews.element import Labels, Tiles
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 3 for calling the TestLabelsPlot obj's underlying member method code with example usage: obj.test_labels_size() without return types