code: def test(self):
      n = 5
      if self.replay_buffer_type == "ReplayBuffer":
          rbuf = replay_buffers.ReplayBuffer(capacity=None, num_steps=n)
      elif self.replay_buffer_type == "PrioritizedReplayBuffer":
          rbuf = replay_buffers.PrioritizedReplayBuffer(
              capacity=None, num_steps=n
          )
      else:
          assert False
  
      # 2 transitions for env_id=0
      for _ in range(2):
          trans1 = dict(
              state=0,
              action=1,
              reward=2,
              next_state=3,
              next_action=4,
              is_state_terminal=False,
          )
          rbuf.append(env_id=0, **trans1)
      # 4 transitions for env_id=1 with a terminal state
      for i in range(4):
          trans1 = dict(
              state=0,
              action=1,
              reward=2,
              next_state=3,
              next_action=4,
              is_state_terminal=(i == 3),
          )
          rbuf.append(env_id=1, **trans1)
      # 9 transitions for env_id=2
      for _ in range(9):
          trans1 = dict(
              state=0,
              action=1,
              reward=2,
              next_state=3,
              next_action=4,
              is_state_terminal=False,
          )
          rbuf.append(env_id=2, **trans1)
  
      # It should have:
      #   - 4 transitions from env_id=1
      #   - 5 transitions from env_id=2
      assert len(rbuf) == 9
  
      # env_id=0 episode ends
      rbuf.stop_current_episode(env_id=0)
  
      # Now it should have 9 + 2 = 11 transitions
      assert len(rbuf) == 11
  
      # env_id=2 episode ends
      rbuf.stop_current_episode(env_id=2)
  
      # Finally it should have 9 + 2 + 4 = 15 transitions
      assert len(rbuf) == 15
  
imports: import collections
  import copy
  import os
  import tempfile
  import unittest
  import numpy
  import pytest
  import torch
  from pfrl import replay_buffer, replay_buffers
label_desc: Use image node_id 2 for calling the TestReplayBufferWithEnvID obj's underlying member method code with example usage: obj.test() without return types