code: def testGetSetAtomicity(self):
      atom = self.FILE.Get_atomicity()
      self.assertFalse(atom)
      for atomicity in [True, False] * 4:
          self.FILE.Set_atomicity(atomicity)
          atom = self.FILE.Get_atomicity()
          self.assertEqual(atom, atomicity)
  
imports: from mpi4py import MPI
  import mpiunittest
  import os, tempfile, pathlib
label_desc: Use image node_id 9 for calling the BaseTestFile obj's underlying member method code with example usage: obj.testGetSetAtomicity() without return types