code: def step(self, action):
      del action
      observation = self.observation_space.sample()
      reward, terminal, info = 0.0, False, {}
      return observation, reward, terminal, info
  
file_path: gym/tests/wrappers/test_pixel_observation.py
imports: from typing import Optional
  import numpy
  import pytest
  import gym
  from gym import spaces
  from gym.wrappers.pixel_observation import STATE_KEY, PixelObservationWrapper
label_desc: Use image node_id 4 for calling the FakeEnvironment obj's underlying member method code with example usage: obj.step(action) and returns: observation,  reward,  terminal,  info