code: def test_calling_get_function_twice(self):
      self.add_master()
      self.add_worker(n_cpu=1)
      parl.connect("localhost:{}".format(self.port))
      actor = Actor()
      future_obj = actor.get_arg1()
      result = future_obj.get()
      with self.assertRaises(exceptions.FutureGetRepeatedlyError):
          result = future_obj.get()
      actor.destroy()
  
file_path: PARL/parl/remote/future_mode/tests/future_object_test.py
imports: import unittest
  import parl
  import time
  import threading
  from parl.remote import exceptions
  from parl.remote.future_mode import FutureObject
  from parl.utils.test_utils import XparlTestCase
label_desc: Use image node_id 2 for calling the TestFutureObject obj's underlying member method code with example usage: obj.test_calling_get_function_twice() without return types