code: def test_overlay_plot_xlabel(self):
      overlay = Curve([]) * Curve([(10, 1), (100, 2), (1000, 3)]).opts(
          xlabel="X-Axis"
      )
      state = self._get_plot_state(overlay)
      self.assertEqual(
          state["layout"]["xaxis"]["title"]["text"], "X-Axis"
      )
  
imports: from collections import deque
  import numpy
  import pandas
  from holoviews.core.spaces import DynamicMap
  from holoviews.element import Curve, Path3D, Scatter3D
  from holoviews.streams import PointerX
  from .test_plot import TestPlotlyPlot, plotly_renderer
label_desc: Use image node_id 5 for calling the TestOverlayPlot obj's underlying member method code with example usage: obj.test_overlay_plot_xlabel() without return types