// adding the entry populates the indexes
	c.Add(firstEntry.Key(), firstEntry, req, res)

	assert.Equal(t, cache.store.Len(), 1)
	assert.Equal(t, cache.indexLength(), 2)
	assert.Equal(t, cache.configIndexSnapshot(), map[ConfigHash]sets.Set[uint64]{
		ConfigKey{Kind: kind.Service, Name: "name", Namespace: "namespace"}.HashCode():         sets.New(firstEntry.Key()),

		}

		res[i] = v.value
	}
	return res
}

func (l *lruCache[K]) indexLength() int {
	l.mu.RLock()
	defer l.mu.RUnlock()
	return len(l.configIndex)
}

func (l *lruCache[K]) configIndexSnapshot() map[ConfigHash]sets.Set[K] {
	l.mu.RLock()
	defer l.mu.RUnlock()
	res := make(map[ConfigHash]sets.Set[K], len(l.configIndex))
	for k, v := range l.configIndex {
		res[k] = v
	}
	return res
}