class_docstr: Test of the MultiInterface.
class_docstr_tok: ["Test","of","the","MultiInterface","."]
code: def test_empty_length(self):
      mds = Path([], kdims=["x", "y"], datatype=[self.datatype])
      self.assertIs(mds.interface, self.interface)
      self.assertEqual(len(mds), 0)
  
imports: import logging
  import numpy
  import pandas
  from param import get_logger
  from holoviews.core.data import Dataset, MultiInterface
  from holoviews.element import Path, Points, Polygons
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 9 for calling the GeomTests obj's underlying member method code with example usage: obj.test_empty_length() without return types