code: def testDoesntRaiseDirectoryDeletedErrorIfOutageIsTransient(self):
      self._WriteToFile("a", "a")
      self._LoadAllEvents()
      shutil.rmtree(self._directory)
  
      # Fake a single transient I/O error.
      def FakeFactory(original):
          def Fake(*args, **kwargs):
              if FakeFactory.has_been_called:
                  original(*args, **kwargs)
              else:
                  raise OSError("lp0 temporarily on fire")
  
          return Fake
  
      FakeFactory.has_been_called = False
  
      stub_names = [
          "ListDirectoryAbsolute",
          "ListRecursivelyViaGlobbing",
          "ListRecursivelyViaWalking",
      ]
      for stub_name in stub_names:
          self.stubs.Set(
              io_wrapper,
              stub_name,
              FakeFactory(getattr(io_wrapper, stub_name)),
          )
      for stub_name in ["exists", "stat"]:
          self.stubs.Set(
              tf.io.gfile,
              stub_name,
              FakeFactory(getattr(tf.io.gfile, stub_name)),
          )
  
      with self.assertRaises((IOError, OSError)):
          self._LoadAllEvents()
  
imports: import os
  import shutil
  import tensorflow
  from tensorboard.backend.event_processing import directory_watcher
  from tensorboard.backend.event_processing import io_wrapper
label_desc: Use image node_id 20 for calling the DirectoryWatcherTest obj's underlying member method code with example usage: obj.testDoesntRaiseDirectoryDeletedErrorIfOutageIsTransient() and returns: Fake