code: def testToTransitionSpec(self):
      env = tf_py_environment.TFPyEnvironment(
          drivers_test_utils.PyEnvironmentMock()
      )
      policy = drivers_test_utils.TFPolicyMock(
          env.time_step_spec(), env.action_spec()
      )
      trajectory_spec = policy.trajectory_spec
      transition_spec = trajectory.to_transition_spec(trajectory_spec)
      self.assertIsInstance(transition_spec, trajectory.Transition)
      ts_spec, ps_spec, nts_spec = transition_spec
  
      self.assertAllEqual(ts_spec, env.time_step_spec())
      self.assertAllEqual(ps_spec.action, env.action_spec())
      self.assertAllEqual(nts_spec, env.time_step_spec())
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import sys
  import numpy
  import tensorflow
  from tf_agents.drivers import dynamic_episode_driver
  from tf_agents.drivers import test_utils
  from tf_agents.environments import tf_py_environment
  from tf_agents.trajectories import time_step
  from tf_agents.trajectories import trajectory
  from tf_agents.utils import test_utils
label_desc: Use image node_id 17 for calling the TrajectoryTest obj's underlying member method code with example usage: obj.testToTransitionSpec() without return types