code: def test_empty(self):
      logdir = self.get_temp_dir()
      output = output_lib.DirectoryOutput(logdir)
      output.close()
      events = _test_util.read_tfevents(logdir)
      self.assertLen(events, 1)
      self.assertEqual(events[0].file_version, "brain.Event:2")
  
file_path: tensorboard/tensorboard/summary/_output_test.py
imports: import numpy
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.compat.proto import types_pb2
  from tensorboard.summary import _output
  from tensorboard.summary import _test_util
  from tensorboard.util import tensor_util
  from tensorboard import test
label_desc: Use image node_id 1 for calling the DirectoryOutputTest obj's underlying member method code with example usage: obj.test_empty() without return types