code: def test_curve_dash(self):
      curve = Tiles("") * Curve([1, 2, 3]).opts(dash="dash")
      with self.assertRaises(ValueError) as e:
          self._get_plot_state(curve)
      self.assertIn("dash", str(e.exception))
  
imports: import numpy
  from holoviews.element import Curve, Tiles
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 7 for calling the TestMapboxCurvePlot obj's underlying member method code with example usage: obj.test_curve_dash() without return types