code: def test_flex_dict(self):
      space = FlexDict({})
      space["box"] = gym.spaces.Box(low=-1, high=1, shape=(1, 200))
      space["discrete"] = gym.spaces.Discrete(2)
      space["tuple"] = gym.spaces.Tuple(
          (
              gym.spaces.Box(low=-1, high=1, shape=(1, 200)),
              gym.spaces.Discrete(2),
          )
      )
  
      d = gym_space_to_dict(space)
      sp = gym_space_from_dict(d)
  
      self.assertTrue(isinstance(sp["box"], gym.spaces.Box))
      self.assertTrue(isinstance(sp["discrete"], gym.spaces.Discrete))
      self.assertTrue(isinstance(sp["tuple"], gym.spaces.Tuple))
  
imports: import unittest
  from collections import OrderedDict
  import gymnasium
  import numpy
  from ray.rllib.utils.serialization import convert_numpy_to_python_primitives, gym_space_from_dict, gym_space_to_dict, space_from_dict, space_to_dict
  from ray.rllib.utils.spaces.flexdict import FlexDict
  from ray.rllib.utils.spaces.repeated import Repeated
  from ray.rllib.utils.spaces.simplex import Simplex
label_desc: Use image node_id 10 for calling the TestGymCheckEnv obj's underlying member method code with example usage: obj.test_flex_dict() without return types