How to use the tinydb.utils.LRUCache function in tinydb

def test_lru_cache_unlimited_explicit():
    cache = LRUCache(capacity=None)
    for i in range(100):
        cache[i] = i

    assert len(cache.lru) == 100

def test_lru_cache_set_multiple():
    cache = LRUCache(capacity=3)
    cache["a"] = 1
    cache["a"] = 2
    cache["a"] = 3
    cache["a"] = 4

    assert cache.lru == ["a"]

def test_lru_cache():
    cache = LRUCache(capacity=3)
    cache["a"] = 1
    cache["b"] = 2
    cache["c"] = 3
    _ = cache["a"]  # move to front in lru queue
    cache["d"] = 4  # move oldest item out of lru queue

    try:
        _ = cache['f']
    except KeyError:
        pass

    assert cache.lru == ["c", "a", "d"]

def test_lru_cache_iteration_works():
    cache = LRUCache()
    count = 0
    for _ in cache:
        assert False, 'there should be no elements in the cache'

    assert count == 0

def test_lru_cache_clear():
    cache = LRUCache(capacity=3)
    cache["a"] = 1
    cache["b"] = 2
    cache.clear()

    assert cache.lru == []

def test_lru_cache_delete():
    cache = LRUCache(capacity=3)
    cache["a"] = 1
    cache["b"] = 2
    del cache["a"]

    try:
        del cache['f']
    except KeyError:
        pass

    assert cache.lru == ["b"]

def test_lru_cache_get():
    cache = LRUCache(capacity=3)
    cache["a"] = 1
    cache["b"] = 1
    cache["c"] = 1
    cache.get("a")
    cache["d"] = 4

    assert cache.lru == ["c", "a", "d"]

def test_lru_cache_unlimited():
    cache = LRUCache()
    for i in range(100):
        cache[i] = i

    assert len(cache.lru) == 100

def __init__(self, name, db, cache_size=10):
        """
        Get access to a table.

        :param name: The name of the table.
        :type name: str
        :param db: The parent database.
        :type db: tinydb.database.TinyDB
        :param cache_size: Maximum size of query cache.
        """

        self.name = name
        self._db = db
        self._query_cache = LRUCache(capacity=cache_size)

        old_ids = self._read().keys()
        if old_ids:
            self._last_id = max(i for i in old_ids)
        else:
            self._last_id = 0