code: def test(self):
      rbuf = PersistentEpisodicReplayBuffer(
          self.tempdir.name, capacity=None
      )
  
      # 2 transitions for env_id=0
      for i 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 i 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
      assert len(rbuf) == 4
  
      # env_id=0 episode ends
      rbuf.stop_current_episode(env_id=0)
  
      # Now it should have 4 + 2 = 6 transitions
      assert len(rbuf) == 6
  
      # env_id=2 episode ends
      rbuf.stop_current_episode(env_id=2)
  
      # Finally it should have 4 + 2 + 9 = 15 transitions
      assert len(rbuf) == 15
  
file_path: pfrl/tests/replay_buffers_test/test_persistent_replay_buffer.py
imports: import os
  import tempfile
  import pytest
  from pfrl.replay_buffers import PersistentEpisodicReplayBuffer
label_desc: Use image node_id 3 for calling the TestEpisodicReplayBufferWithEnvID obj's underlying member method code with example usage: obj.test() without return types