code: def test_state(self):
      env = ale.ALE("breakout")
      self.assertEqual(len(env.state), 4)
      for s in env.state:
          self.assertEqual(s.shape, (84, 84))
          self.assertEqual(s.dtype, np.uint8)
  
file_path: chainerrl/tests/test_ale.py
imports: import random
  import sys
  import tempfile
  import unittest
  import numpy
  from PIL import Image
  from chainerrl.envs import ale
label_desc: Use image node_id 2 for calling the TestALE obj's underlying member method code with example usage: obj.test_state() without return types