code: def test_vstack_matrix_or_array(self):
      A = [[1, 2], [3, 4]]
      B = [[5, 6]]
      assert isinstance(
          construct.vstack([coo_array(A), coo_array(B)]), sparray
      )
      assert isinstance(
          construct.vstack([coo_array(A), coo_matrix(B)]), sparray
      )
      assert isinstance(
          construct.vstack([coo_matrix(A), coo_array(B)]), sparray
      )
      assert isinstance(
          construct.vstack([coo_matrix(A), coo_matrix(B)]), spmatrix
      )
  
imports: import numpy
  from numpy import array
  from numpy.testing import assert_equal, assert_, assert_array_equal, assert_array_almost_equal_nulp
  import pytest
  from pytest import raises
  from scipy._lib._testutils import check_free_memory
  from scipy._lib._util import check_random_state
  from scipy.sparse import csr_matrix, coo_matrix, csr_array, coo_array, sparray, spmatrix, _construct
  from scipy.sparse._construct import rand
label_desc: Use image node_id 18 for calling the TestConstructUtils obj's underlying member method code with example usage: obj.test_vstack_matrix_or_array() without return types