code: def test_labels_size(self):
      labels = Tiles("") * Labels(
          [(0, 3, 0), (0, 2, 1), (0, 1, 1)]
      ).opts(size=23)
      state = self._get_plot_state(labels)
      self.assertEqual(state["data"][1]["textfont"]["size"], 23)
  
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 4 for calling the TestMapboxLabelsPlot obj's underlying member method code with example usage: obj.test_labels_size() without return types