class_docstr: A helper mixin for testing Reverb adders.
  
  Note that any test inheriting from this mixin must also inherit from something
  that provides the Python unittest assert methods.
code: def setUpClass(cls):
      super().setUpClass()
  
      replay_table = reverb.Table.queue(
          adders.DEFAULT_PRIORITY_TABLE, 1000
      )
      cls.server = reverb.Server([replay_table])
      cls.client = reverb.Client(f"localhost:{cls.server.port}")
  
imports: from typing import Any, Callable, Optional, Sequence, Tuple, TypeVar, Union
  from acme import specs
  from acme import types
  from acme.adders import base
  from acme.adders import reverb
  from acme.utils import tree_utils
  import dm_env
  import numpy
  import reverb
  import tensorflow
  import tree
  from absl.testing import absltest
label_desc: Use image node_id 1 for calling the AdderTestMixin obj's underlying member method code with example usage: obj.setUpClass(cls) without return types