code: def test_discrete_space_encode(self):
      discrete_space = Discrete(100)
      value = discrete_space.sample()
      encoded_value = gym_spaces_utils.gym_space_encode(
          discrete_space, value
      )
      self.assertListEqual([value], encoded_value)
  
file_path: tensor2tensor/tensor2tensor/envs/gym_spaces_utils_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from gym.spaces import Box
  from gym.spaces import Discrete
  import numpy
  from tensor2tensor.envs import gym_spaces_utils
  import tensorflow.compat.v1
label_desc: Use image node_id 3 for calling the GymSpacesUtilsTest obj's underlying member method code with example usage: obj.test_discrete_space_encode() without return types