code: def test_pixel_env_step(self):
      self.pixel_env.reset()
      action = np.full(self.pixel_env.action_space.shape, 0)
      obs, _, _, _ = self.pixel_env.step(action)
      assert (obs <= 255.0).all() and (obs >= 0.0).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 6 for calling the TestPixelObservationWrapper obj's underlying member method code with example usage: obj.test_pixel_env_step() without return types