code: def test_dm_dense_nullspace_fracfree(name, A, A_null):
      A = A.to_dense()
      A_null_found = A.nullspace()
      _check_primitive(A_null_found, A_null)
  
file_path: sympy/sympy/polys/matrices/tests/test_nullspace.py
imports: from sympy import ZZ, Matrix
  from sympy.polys.matrices import DM, DomainMatrix
  from sympy.polys.matrices.ddm import DDM
  from sympy.polys.matrices.sdm import SDM
  import pytest
label_desc: Use image node_id 10 for calling a global function with example usage: test_dm_dense_nullspace_fracfree(name, A, A_null) without return types