code: def test_pickleable(self):
      cache = LRUCache(2)
      cache["foo"] = 42
      cache["bar"] = 23
      cache["foo"]
  
      for protocol in range(3):
          copy = pickle.loads(pickle.dumps(cache, protocol))
          assert copy.capacity == cache.capacity
          assert copy._mapping == cache._mapping
          assert copy._queue == cache._queue
  
imports: import pickle
  import random
  from collections import deque
  from copy import copy
  import pytest
  from markupsafe import Markup
  from jinja2.utils import consume
  from jinja2.utils import generate_lorem_ipsum
  from jinja2.utils import LRUCache
  from jinja2.utils import missing
  from jinja2.utils import object_type_repr
  from jinja2.utils import select_autoescape
  from jinja2.utils import urlize
label_desc: Use image node_id 4 for calling the TestLRUCache obj's underlying member method code with example usage: obj.test_pickleable() without return types