code: def test_multi_y_enabled_two_curves_one_vdim(self):
      overlay = (Curve(range(10)) * Curve(range(10))).opts(multi_y=True)
      plot = bokeh_renderer.get_plot(overlay).state
      self.assertEqual(len(plot.yaxis), 1)
  
imports: from bokeh.models import LinearAxis, LinearScale, LogAxis, LogScale
  from holoviews.element import Curve
  from ...utils import LoggingComparisonTestCase
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 2 for calling the TestCurveTwinAxes obj's underlying member method code with example usage: obj.test_multi_y_enabled_two_curves_one_vdim() without return types