code: def test_indexing(self, xp):
      a = cupy.testing.shaped_arange((3, 1), xp)[:, :, None]
      b = cupy.testing.shaped_arange((3, 2), xp)[:, None, :]
      return a * b
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 6 for calling the TestArrayUfunc obj's underlying member method code with example usage: obj.test_indexing(xp) and returns: unknown