code: def hostname(self):
      import socket
  
      return socket.gethostname()
  
file_path: BigDL/python/orca/test/bigdl/orca/ray/ray_cluster/test_rayctx_local.py
imports: from unittest import TestCase
  import pytest
  import ray
  from bigdl.orca import stop_orca_context
  from bigdl.orca.ray import OrcaRayContext
label_desc: Use image node_id 1 for calling the TestRay obj's underlying member method code with example usage: obj.hostname() and returns: socket