code: def test_pixel_env_observation_space(self):
      assert isinstance(
          self.pixel_env.observation_space, gym.spaces.Box
      )
      assert (self.pixel_env.observation_space.low == 0).all()
      assert (self.pixel_env.observation_space.high == 255).all()
  
file_path: garage/tests/garage/envs/wrappers/test_pixel_observation_wrapper.py
imports: import gym
  import numpy
  import pytest
  from garage.envs.wrappers import PixelObservationWrapper
label_desc: Use image node_id 4 for calling the TestPixelObservationWrapper obj's underlying member method code with example usage: obj.test_pixel_env_observation_space() without return types