code: def test_image_stack(self):
      x = np.arange(0, 3)
      y = np.arange(5, 8)
      a = np.array([[np.nan, np.nan, 1], [np.nan] * 3, [np.nan] * 3])
      b = np.array([[np.nan] * 3, [1, 1, np.nan], [np.nan] * 3])
      c = np.array([[np.nan] * 3, [np.nan] * 3, [1, 1, 1]])
      image_stack = ImageStack(
          (x, y, a, b, c), kdims=["x", "y"], vdims=["a", "b", "c"]
      )
      assert isinstance(plotly_renderer.get_plot(image_stack), RGBPlot)
      fig_dict = plotly_renderer.get_plot_state(image_stack)
      x_range = fig_dict["layout"]["xaxis"]["range"]
      assert x_range[0] == -0.5
      assert x_range[1] == 2.5
  
      y_range = fig_dict["layout"]["yaxis"]["range"]
      assert y_range[0] == 4.5
      assert y_range[1] == 7.5
  
      # Check layout.image object
      images = fig_dict["layout"]["images"]
      assert len(images) == 1
      image = images[0]
  
      # Check location properties
      assert image["xref"] == "x"
      assert image["yref"] == "y"
      assert image["x"] == -0.5
      assert image["y"] == 7.5
      assert image["sizex"] == 3
      assert image["sizey"] == 3
      assert image["sizing"] == "stretch"
      assert image["layer"] == "above"
  
file_path: holoviews/holoviews/tests/plotting/plotly/test_imagestack.py
imports: from unittest import SkipTest
  import numpy
  from holoviews.element import ImageStack
  from holoviews.plotting.plotly import RGBPlot
  from .test_plot import TestPlotlyPlot, plotly_renderer
label_desc: Use image node_id 1 for calling the TestImageStackPlot obj's underlying member method code with example usage: obj.test_image_stack() without return types