code: def test_csc(self):
      A, B = self.data()
      actual = _construct.hstack(
          [A.tocsc(), B.tocsc()], dtype=self.dtype
      ).todense()
      testing.assert_array_equal(actual, self.expected())
      assert actual.dtype == self.dtype
  
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 4 for calling the TestHstack obj's underlying member method code with example usage: obj.test_csc() without return types