code: def test_append_and_terminate(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):
          trans1 = dict(
              state=0,
              action=1,
              reward=2,
              next_state=3,
              next_action=4,
              is_state_terminal=False,
          )
          rbuf.append(**trans1)
      self.assertEqual(len(rbuf), 1)
      s1 = rbuf.sample(1)
      self.assertEqual(len(s1), 1)
  
      # Add two and sample two, which must be unique
      trans2 = dict(
          state=1,
          action=1,
          reward=2,
          next_state=3,
          next_action=4,
          is_state_terminal=True,
      )
      rbuf.append(**trans2)
      self.assertEqual(len(rbuf), self.num_steps + 1)
      s2 = rbuf.sample(self.num_steps + 1)
      self.assertEqual(len(s2), self.num_steps + 1)
      if self.num_steps == 1:
          if s2[0][0]["state"] == 0:
              self.assertEqual(s2[1][0]["state"], 1)
          else:
              self.assertEqual(s2[1][0]["state"], 0)
      else:
          for item in s2:
              # e.g. if states are 0,0,0,1 then buffer looks like:
              # [[0,0,0], [0, 0, 1], [0, 1], [1]]
              if len(item) < self.num_steps:
                  self.assertEqual(item[len(item) - 1]["state"], 1)
                  for i in range(len(item) - 1):
                      self.assertEqual(item[i]["state"], 0)
              else:
                  for i in range(len(item) - 1):
                      self.assertEqual(item[i]["state"], 0)
  
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 2 for calling the TestReplayBuffer obj's underlying member method code with example usage: obj.test_append_and_terminate() without return types