code: def tearDown(self):
      if self.FILE:
          self.FILE.Close()
      self.COMM.Barrier()
  
imports: from mpi4py import MPI
  import mpiunittest
  import arrayimpl
  import os, tempfile
  import platform
label_desc: Use image node_id 2 for calling the BaseTestIO obj's underlying member method code with example usage: obj.tearDown() without return types