class_docstr: Test of the MultiInterface.
class_docstr_tok: ["Test","of","the","MultiInterface","."]
code: def test_array_groupby_non_scalar(self):
      arrays = [
          np.array([(1 + i, i), (2 + i, i), (3 + i, i)])
          for i in range(2)
      ]
      mds = Dataset(arrays, kdims=["x", "y"], datatype=[self.datatype])
      self.assertIs(mds.interface, self.interface)
      with self.assertRaises(ValueError):
          mds.groupby("x")
  
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 36 for calling the GeomTests obj's underlying member method code with example usage: obj.test_array_groupby_non_scalar() without return types