code: def test_remove_worker(self):
      worker_manager = WorkerManager("localhost", ["gpu"])
      worker_manager.add_worker(self.worker1)
      worker_manager.add_worker(self.worker2)
  
      self.assertEqual(worker_manager.job_num, 8)
      self.assertEqual(
          self.worker1.worker_address
          in worker_manager.worker_vacant_jobs,
          True,
      )
      self.assertEqual(
          self.worker2.worker_address
          in worker_manager.worker_vacant_jobs,
          True,
      )
  
      worker_manager.remove_worker(self.worker1.worker_address)
      self.assertEqual(worker_manager.job_num, 4)
      self.assertEqual(
          self.worker1.worker_address
          in worker_manager.worker_vacant_jobs,
          False,
      )
  
      worker_manager.remove_worker(self.worker2.worker_address)
      self.assertEqual(worker_manager.job_num, 0)
      self.assertEqual(
          self.worker2.worker_address
          in worker_manager.worker_vacant_jobs,
          False,
      )
  
file_path: PARL/parl/remote/tests/gpu/worker_manager_test.py
imports: import unittest
  import socket
  from parl.remote.worker_manager import WorkerManager
  from parl.remote.message import InitializedWorker, InitializedJob, AllocatedCpu, AllocatedGpu
  from parl.utils.test_utils import XparlTestCase
label_desc: Use image node_id 3 for calling the ImportTest obj's underlying member method code with example usage: obj.test_remove_worker() without return types