code: def testRaisesRightErrorWhenDirectoryIsDeleted(self):
      self._WriteToFile("a", "a")
      self._LoadAllEvents()
      shutil.rmtree(self._directory)
      with self.assertRaises(directory_watcher.DirectoryDeletedError):
          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 19 for calling the DirectoryWatcherTest obj's underlying member method code with example usage: obj.testRaisesRightErrorWhenDirectoryIsDeleted() without return types