code: def testConstructor(self):
      memory = circular_replay_buffer.ReplayBuffer(
          stack_size=STACK_SIZE,
          replay_capacity=5,
          batch_size=BATCH_SIZE,
      )
      self.assertEqual(memory.add_count, 0)
  
imports: import tempfile
  import unittest
  import numpy
  import numpy.testing
  import torch
  from reagent.replay_memory import circular_replay_buffer
label_desc: Use image node_id 3 for calling the ReplayBufferTest obj's underlying member method code with example usage: obj.testConstructor() without return types