code: def testToTransitionHandlesTrajectoryFromDriverCorrectly(self):
      env = tf_py_environment.TFPyEnvironment(
          drivers_test_utils.PyEnvironmentMock()
      )
      policy = drivers_test_utils.TFPolicyMock(
          env.time_step_spec(), env.action_spec()
      )
      replay_buffer = drivers_test_utils.make_replay_buffer(policy)
  
      driver = dynamic_episode_driver.DynamicEpisodeDriver(
          env,
          policy,
          num_episodes=3,
          observers=[replay_buffer.add_batch],
      )
  
      run_driver = driver.run()
      rb_gather_all = replay_buffer.gather_all()
  
      self.evaluate(tf.compat.v1.global_variables_initializer())
      self.evaluate(run_driver)
      trajectories = self.evaluate(rb_gather_all)
  
      transitions = trajectory.to_transition(trajectories)
      self.assertIsInstance(transitions, trajectory.Transition)
      time_steps, policy_step, next_time_steps = transitions
  
      self.assertAllEqual(
          time_steps.observation, trajectories.observation[:, :-1]
      )
      self.assertAllEqual(
          time_steps.step_type, trajectories.step_type[:, :-1]
      )
      self.assertAllEqual(
          next_time_steps.observation, trajectories.observation[:, 1:]
      )
      self.assertAllEqual(
          next_time_steps.step_type, trajectories.step_type[:, 1:]
      )
      self.assertAllEqual(
          next_time_steps.reward, trajectories.reward[:, :-1]
      )
      self.assertAllEqual(
          next_time_steps.discount, trajectories.discount[:, :-1]
      )
  
      self.assertAllEqual(
          policy_step.action, trajectories.action[:, :-1]
      )
      self.assertAllEqual(
          policy_step.info, trajectories.policy_info[:, :-1]
      )
  
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 16 for calling the TrajectoryTest obj's underlying member method code with example usage: obj.testToTransitionHandlesTrajectoryFromDriverCorrectly() without return types