code: def test_copy_tree_skips_nfs_temp_files(self):
      mkpath(self.target, verbose=0)
  
      a_file = os.path.join(self.target, "ok.txt")
      nfs_file = os.path.join(self.target, ".nfs123abc")
      for f in a_file, nfs_file:
          fh = open(f, "w")
          try:
              fh.write("some content")
          finally:
              fh.close()
  
      copy_tree(self.target, self.target2)
      self.assertEqual(os.listdir(self.target2), ["ok.txt"])
  
      remove_tree(self.root_target, verbose=0)
      remove_tree(self.target2, verbose=0)
  
imports: import unittest
  import os
  import stat
  import shutil
  import sys
  from distutils.dir_util import mkpath, remove_tree, create_tree, copy_tree, ensure_relative
  from distutils import log
  from distutils.tests import support
  from test.test_support import run_unittest
label_desc: Use image node_id 8 for calling the DirUtilTestCase obj's underlying member method code with example usage: obj.test_copy_tree_skips_nfs_temp_files() without return types