class_docstr: Terminates once it receives the first ping() call.
code: def set_courier_server(self, server: courier.Server):
      self._server = server
  
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 5 for calling the Server obj's underlying member method code with example usage: obj.set_courier_server(server) without return types