code: def test_curve_color(self):
      curve = Tiles("") * Curve([1, 2, 3]).opts(color="red")
      state = self._get_plot_state(curve)
      self.assertEqual(state["data"][1]["line"]["color"], "red")
  
imports: import numpy
  from holoviews.element import Curve, Tiles
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 5 for calling the TestMapboxCurvePlot obj's underlying member method code with example usage: obj.test_curve_color() without return types