def test_get_dict_copy_and_keys(self):
cache = LRUCache(3)
cache[1] = '1'
cache[2] = '2'
cache[3] = '3'
self.assertEqual({1: '1', 2: '2', 3: '3'}, cache.dict_copy())
keys = cache.keys()
# Sort keys to make sure they are in the same order on all platforms.
keys.sort()
self.assertEqual([1, 2, 3], keys)
self.assertEqual(3, len(cache))
