class_docstr: Terminates once it receives the first ping() call.
code: def run(self):
      self._server.Start()
      self._has_ping.wait()
      self._has_call.wait()
      self._server.Stop()
  
imports: import datetime
  import sys
  import threading
  import time
  from unittest import mock
  from absl.testing import absltest
  import courier
  from launchpad.launch.test_multi_threading import address_builder
  from launchpad.nodes.courier import node
label_desc: Use image node_id 6 for calling the Server obj's underlying member method code with example usage: obj.run() without return types