code: def test_boxwhisker_simple(self):
      values = np.random.rand(100)
      boxwhisker = BoxWhisker(values)
      plot = mpl_renderer.get_plot(boxwhisker)
      data, style, axis_opts = plot.get_data(boxwhisker, {}, {})
      self.assertEqual(data[0][0], values)
      self.assertEqual(style["labels"], [""])
  
file_path: holoviews/holoviews/tests/plotting/matplotlib/test_boxwhisker.py
imports: import numpy
  from holoviews.element import BoxWhisker
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 1 for calling the TestMPLBoxWhiskerPlot obj's underlying member method code with example usage: obj.test_boxwhisker_simple() without return types