code: def test_env_vars(self):
      self.assertEqual(config.client_id(), 0)
      self.assertEqual(config.num_clients(), 1)
      self.assertEqual(config.job_name(), "localhost")
      self.assertEqual(
          config.full_job_name(), "localhost/replica:0/task:0"
      )
      self.assertEqual(config.jobs(), [])
  
file_path: tensorflow-upstream/tensorflow/dtensor/python/tests/config_test.py
imports: import os
  from tensorflow.dtensor.python import config
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.python.eager import context
  from tensorflow.python.framework import device
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the ConfigTest obj's underlying member method code with example usage: obj.test_env_vars() without return types