code: def test_generates_data(self):
      # This test needs base env which outputs done after two steps.
      self.init_batch_and_play(
          TEST_ENV_NAME, steps_per_epoch=20, generate_data=True
      )
  
      filenames = os.listdir(self.out_dir)
      self.assertTrue(filenames)
      for filename in filenames:
          path = os.path.join(self.out_dir, filename)
          records = list(tf.python_io.tf_record_iterator(path))
          self.assertTrue(records)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  import gym
  from gym.spaces import Box
  from gym.spaces import Discrete
  import numpy
  from tensor2tensor.data_generators import gym_env
  from tensor2tensor.data_generators import problem
  from tensor2tensor.rl.gym_utils import make_gym_env
  import tensorflow.compat.v1
label_desc: Use image node_id 7 for calling the GymEnvTest obj's underlying member method code with example usage: obj.test_generates_data() without return types