code: def test_observation_space(self):
      env = InterestEvolutionRecSimEnv()
      obs, info = env.reset()
      self.assertTrue(
          env.observation_space.contains(obs),
          f"{env.observation_space} doesn't contain {obs}",
      )
      new_obs, _, _, _, _ = env.step(env.action_space.sample())
      self.assertTrue(env.observation_space.contains(new_obs))
  
file_path: ray/rllib/env/wrappers/tests/test_recsim_wrapper.py
imports: import gymnasium
  import unittest
  from ray.rllib.examples.env.recommender_system_envs_with_recsim import InterestEvolutionRecSimEnv
  from ray.rllib.env.wrappers.recsim import MultiDiscreteToDiscreteActionWrapper
  from ray.rllib.utils.error import UnsupportedSpaceException
label_desc: Use image node_id 1 for calling the TestRecSimWrapper obj's underlying member method code with example usage: obj.test_observation_space() without return types