code: def test_Module_ancestors():
      T = Poly(cyclotomic_poly(5, x))
      A = PowerBasis(T)
      B = A.submodule_from_matrix(2 * DomainMatrix.eye(4, ZZ))
      C = B.submodule_from_matrix(3 * DomainMatrix.eye(4, ZZ))
      D = B.submodule_from_matrix(5 * DomainMatrix.eye(4, ZZ))
      assert C.ancestors(include_self=True) == [A, B, C]
      assert D.ancestors(include_self=True) == [A, B, D]
      assert C.power_basis_ancestor() == A
      assert C.nearest_common_ancestor(D) == B
      M = Module()
      assert M.power_basis_ancestor() is None
  
imports: from sympy.abc import x, zeta
  from sympy.polys import Poly, cyclotomic_poly
  from sympy.polys.domains import FF, QQ, ZZ
  from sympy.polys.matrices import DomainMatrix, DM
  from sympy.polys.numberfields.exceptions import ClosureFailure, MissingUnityError, StructureError
  from sympy.polys.numberfields.modules import Module, ModuleElement, ModuleEndomorphism, PowerBasis, PowerBasisElement, find_min_poly, is_sq_maxrank_HNF, make_mod_elt, to_col
  from sympy.polys.numberfields.utilities import is_int
  from sympy.polys.polyerrors import UnificationFailed
  from sympy.testing.pytest import raises
label_desc: Use image node_id 3 for calling a global function with example usage: test_Module_ancestors() without return types