code: def test_channels(self):
      env_name = TEST_ENV_NAME
      env, obs, _, _ = self.init_batch_and_play(
          env_name, grayscale=True
      )
      self.assert_channels(env, obs, n_channels=1)
  
      env, obs, _, _ = self.init_batch_and_play(
          env_name, grayscale=False
      )
      self.assert_channels(env, obs, n_channels=3)
  
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 14 for calling the GymEnvTest obj's underlying member method code with example usage: obj.test_channels() without return types