code: def test_simple(self):
      d = LRUCache(3)
      d["a"] = 1
      d["b"] = 2
      d["c"] = 3
      d["a"]
      d["d"] = 4
      assert d.keys() == ["d", "a", "c"]
  
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 1 for calling the TestLRUCache obj's underlying member method code with example usage: obj.test_simple() without return types