code: def test_depth_mismatch(self):
      try:
          self.assertEqual(self.overlay1_depth2, self.overlay4_depth3)
      except AssertionError as e:
          self.assertEqual(
              str(e), "Overlays have mismatched path counts."
          )
  
imports: import numpy
  from holoviews import Image
  from holoviews.core import BoundingBox, Dimension
  from holoviews.core.element import HoloMap
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 1 for calling the RasterOverlayComparisonTest obj's underlying member method code with example usage: obj.test_depth_mismatch() without return types