public MemoryLRUCacheBytesIterator reverseRange(final String namespace, final Bytes from, final Bytes to) {
        final NamedCache cache = getCache(namespace);
        if (cache == null) {
            return new MemoryLRUCacheBytesIterator(Collections.emptyIterator(), new NamedCache(namespace, this.metrics));
        }
        return new MemoryLRUCacheBytesIterator(cache.reverseKeyRange(from, to), cache);
    }
@Test
    public void shouldReturnFalseIfNoNextKeyReverseRange() {
        final ThreadCache cache = setupThreadCache(-1, 0, 10000L, true);
        final ThreadCache.MemoryLRUCacheBytesIterator iterator = cache.reverseRange(namespace, Bytes.wrap(new byte[]{0}), Bytes.wrap(new byte[]{1}));
        assertFalse(iterator.hasNext());
    }