code: def test_labels_plot_rotation_style(self):
      text = Labels([(0, 0, "Test")]).opts(angle=90)
      plot = bokeh_renderer.get_plot(text)
      glyph = plot.handles["glyph"]
      self.assertEqual(glyph.angle, np.pi / 2.0)
  
imports: import unittest
  import numpy
  import holoviews
  from holoviews.element import Arrow, HLine, HLines, HSpan, HSpans, Labels, Slope, Text, VLine, VLines, VSpan, VSpans
  from holoviews.plotting.bokeh.util import bokeh32, bokeh33
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 2 for calling the TestLabelsPlot obj's underlying member method code with example usage: obj.test_labels_plot_rotation_style() without return types