code: def testRendersImage(self):
      action_spec = array_spec.BoundedArraySpec((1,), np.int32, -10, 10)
      observation_spec = array_spec.BoundedArraySpec(
          (1,), np.int32, -10, 10
      )
      env = random_py_environment.RandomPyEnvironment(
          observation_spec, action_spec, render_size=(4, 4, 3)
      )
  
      env.reset()
      img = env.render()
  
      self.assertTrue(np.all(img < 256))
      self.assertTrue(np.all(img >= 0))
      self.assertEqual((4, 4, 3), img.shape)
      self.assertEqual(np.uint8, img.dtype)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  from tf_agents.environments import random_py_environment
  from tf_agents.specs import array_spec
  from tf_agents.utils import test_utils
label_desc: Use image node_id 6 for calling the RandomPyEnvironmentTest obj's underlying member method code with example usage: obj.testRendersImage() without return types