code: def test_DomainScalar_unify():
      A = DomainScalar(ZZ(1), ZZ)
      B = DomainScalar(QQ(2), QQ)
      A, B = A.unify(B)
      assert A.domain == B.domain == QQ
  
imports: from sympy.testing.pytest import raises
  from sympy.core.symbol import S
  from sympy.polys import ZZ, QQ
  from sympy.polys.matrices.domainscalar import DomainScalar
  from sympy.polys.matrices.domainmatrix import DomainMatrix
label_desc: Use image node_id 8 for calling a global function with example usage: test_DomainScalar_unify() without return types