code: def test_deep_layout_nesting_slice(self):
      hmap1 = self.layout_map.HoloMap.I[1:3, 1:3, 0:0.5, 0:0.5]
      hmap2 = self.layout_map.HoloMap.II[1:3, 1:3, 0:0.5, 0:0.5]
      selection = self.layout_map.select(
          a=(1, 3), b=(1, 3), x=(0, 0.5), y=(0, 0.5)
      )
      self.assertEqual(selection, hmap1 + hmap2)
  
imports: import datetime
  from itertools import product
  import numpy
  import pandas
  from holoviews.core import HoloMap
  from holoviews.element import Contours, Curve, Image
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 9 for calling the DimensionedSelectionTest obj's underlying member method code with example usage: obj.test_deep_layout_nesting_slice() without return types