code: def test_stop_current_episode(self):
      capacity = self.capacity
      num_steps = self.num_steps
      rbuf = replay_buffer.ReplayBuffer(capacity, num_steps)
  
      self.assertEqual(len(rbuf), 0)
  
      # Add one and sample one
      for _ in range(num_steps - 1):
          trans1 = dict(
              state=0,
              action=1,
              reward=2,
              next_state=3,
              next_action=4,
              is_state_terminal=False,
          )
          rbuf.append(**trans1)
      # we haven't experienced n transitions yet
      self.assertEqual(len(rbuf), 0)
      # episode ends
      rbuf.stop_current_episode()
      # episode ends, so we should add n-1 transitions
      self.assertEqual(len(rbuf), self.num_steps - 1)
  
imports: import collections
  import copy
  import os
  import tempfile
  import unittest
  from chainer import testing
  import numpy
  from chainerrl import replay_buffer
label_desc: Use image node_id 3 for calling the TestReplayBuffer obj's underlying member method code with example usage: obj.test_stop_current_episode() without return types