code: def test_stack_frames_output_observation_space(self):
      print(self.env_s.observation_space.shape)
      assert self.env_s.observation_space.shape == (
          self.width,
          self.height,
          self.n_frames,
      )
  
file_path: garage/tests/garage/envs/wrappers/test_stack_frames_env.py
imports: import gym.spaces
  import numpy
  import pytest
  from garage.envs.wrappers import StackFrames
  from tests.fixtures.envs.dummy import DummyDiscrete2DEnv
label_desc: Use image node_id 5 for calling the TestStackFrames obj's underlying member method code with example usage: obj.test_stack_frames_output_observation_space() without return types