code: def test_cartpole(self):
      env = gym.make("CartPole-v0")
      replay_buffer, inserted = _create_replay_buffer_and_insert(env)
      batch = replay_buffer.sample_transition_batch(
          indices=torch.tensor([0])
      )
      npt.assert_array_almost_equal(
          inserted[0]["observation"], batch.state.squeeze(0)
      )
      npt.assert_array_almost_equal(
          inserted[1]["observation"], batch.next_state.squeeze(0)
      )
      npt.assert_array_equal(
          inserted[0]["action"], batch.action.squeeze(0)
      )
      npt.assert_array_equal(
          inserted[1]["action"], batch.next_action.squeeze(0)
      )
  
file_path: ReAgent/reagent/gym/tests/preprocessors/test_replay_buffer_inserters.py
imports: import logging
  import unittest
  import gym
  import numpy
  import numpy.testing
  import torch
  from reagent.gym.envs import EnvWrapper
  from reagent.gym.preprocessors import make_replay_buffer_inserter
  from reagent.gym.types import Transition
  from reagent.replay_memory import ReplayBuffer
  from reagent.test.base.horizon_test_base import HorizonTestBase
label_desc: Use image node_id 1 for calling the TestBasicReplayBufferInserter obj's underlying member method code with example usage: obj.test_cartpole() without return types