code: def test_SDM_hstack():
      A = SDM({0: {1: ZZ(1)}}, (2, 2), ZZ)
      B = SDM({1: {1: ZZ(1)}}, (2, 2), ZZ)
      AA = SDM({0: {1: ZZ(1), 3: ZZ(1)}}, (2, 4), ZZ)
      AB = SDM({0: {1: ZZ(1)}, 1: {3: ZZ(1)}}, (2, 4), ZZ)
      assert SDM.hstack(A) == A
      assert SDM.hstack(A, A) == AA
      assert SDM.hstack(A, B) == AB
  
imports: from itertools import product
  from sympy.core.singleton import S
  from sympy.external.gmpy import GROUND_TYPES
  from sympy.testing.pytest import raises
  from sympy.polys.domains import QQ, ZZ, EXRAW
  from sympy.polys.matrices.sdm import SDM
  from sympy.polys.matrices.ddm import DDM
  from sympy.polys.matrices.exceptions import DMBadInputError, DMDomainError, DMShapeError
label_desc: Use image node_id 29 for calling a global function with example usage: test_SDM_hstack() without return types