code: def test_kronsum(self, xp, sp):
      a = self._make_sp_mat(xp, sp, self.arrA, self.dtype)
      b = self._make_sp_mat(xp, sp, self.arrB, self.dtype)
      kronsum = sp.kronsum(a, b, format=self.format)
      assert kronsum.shape == (
          a.shape[0] * b.shape[0],
          a.shape[1] * b.shape[1],
      )
      return kronsum
  
imports: import functools
  import re
  from unittest import mock
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.cuda import runtime
  from cupyx.scipy import sparse
  from cupyx.scipy.sparse import _construct
label_desc: Use image node_id 2 for calling the TestKronsum obj's underlying member method code with example usage: obj.test_kronsum(xp, sp) and returns: kronsum