old_contents: # Copyright 2019 The gRPC Authors
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """Test for gRPC Python debug example."""
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  import logging
  import unittest
  from contextlib import contextmanager
  import socket
  
  from examples.python.debug import debug_server
  from examples.python.debug import send_message
  from examples.python.debug import get_stats
  
  _LOGGER = logging.getLogger(__name__)
  _LOGGER.setLevel(logging.INFO)
  
  _FAILURE_RATE = 0.5
  _NUMBER_OF_MESSAGES = 100
  
  _ADDR_TEMPLATE = 'localhost:%d'
  
  class DebugExampleTest(unittest.TestCase):
  
      def test_channelz_example(self):
          server = debug_server.create_server(
              addr='[::]:0', failure_rate=_FAILURE_RATE)
          port = server.add_insecure_port('[::]:0')
          server.start()
          address = _ADDR_TEMPLATE % port
  
          send_message.run(addr=address, n=_NUMBER_OF_MESSAGES)
          get_stats.run(addr=address)
          server.stop(None)
          # No unhandled exception raised, test passed!
  
  
  if __name__ == '__main__':
      logging.basicConfig()
      unittest.main(verbosity=2)
  
new_contents: # Copyright 2019 The gRPC Authors
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """Test for gRPC Python debug example."""
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  import logging
  import unittest
  
  from examples.python.debug import debug_server
  from examples.python.debug import send_message
  from examples.python.debug import get_stats
  
  _LOGGER = logging.getLogger(__name__)
  _LOGGER.setLevel(logging.INFO)
  
  _FAILURE_RATE = 0.5
  _NUMBER_OF_MESSAGES = 100
  
  _ADDR_TEMPLATE = 'localhost:%d'
  
  
  class DebugExampleTest(unittest.TestCase):
  
      def test_channelz_example(self):
          server = debug_server.create_server(
              addr='[::]:0', failure_rate=_FAILURE_RATE)
          port = server.add_insecure_port('[::]:0')
          server.start()
          address = _ADDR_TEMPLATE % port
  
          send_message.run(addr=address, n=_NUMBER_OF_MESSAGES)
          get_stats.run(addr=address)
          server.stop(None)
          # No unhandled exception raised, test passed!
  
  
  if __name__ == '__main__':
      logging.basicConfig()
      unittest.main(verbosity=2)
  
subject: Remove unused imports