code: def read_config(self):
      with open(self.config_file, "r") as f:
          config_file = json.load(f)
      return config_file["test"]
  
file_path: PARL/parl/remote/tests/sync_config_file_test.py
imports: import unittest
  import parl
  import os
  import time
  import threading
  import sys
  import numpy
  import json
  from parl.utils import get_free_tcp_port
  from parl.utils.test_utils import XparlTestCase
label_desc: Use image node_id 3 for calling the Actor obj's underlying member method code with example usage: obj.read_config() and returns: config_file