code: def test_collate_ndlayout_ndoverlay(self):
      layout = (
          self.nesting_hmap.groupby(["delta"])
          .collate(NdOverlay)
          .layout(["alpha", "beta"])
      )
      self.assertEqual(
          layout.dimensions(), self.nested_layout.dimensions()
      )
      self.assertEqual(layout.keys(), self.nested_layout.keys())
      self.assertEqual(repr(layout), repr(self.nested_layout))
  
file_path: holoviews/holoviews/tests/core/test_collation.py
imports: import itertools
  import numpy
  from holoviews.core import Collator, GridSpace, HoloMap, NdOverlay, Overlay
  from holoviews.element import Curve
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 5 for calling the TestCollation obj's underlying member method code with example usage: obj.test_collate_ndlayout_ndoverlay() without return types