code: def test_colorbar_opts_title(self):
      df = pd.DataFrame(np.random.random((10, 4)), columns=list("XYZT"))
      scatter = Scatter3D(data=df).opts(
          color="T",
          colorbar=True,
          colorbar_opts={"title": "some-title"},
      )
      state = self._get_plot_state(scatter)
      assert "colorbar" in state["data"][0]["marker"]
      assert (
          state["data"][0]["marker"]["colorbar"]["title"]["text"]
          == "some-title"
      )
  
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 3 for calling the TestColorbarPlot obj's underlying member method code with example usage: obj.test_colorbar_opts_title() without return types