public MemoryLRUCacheBytesIterator range(final String namespace, final Bytes from, final Bytes to) {
        return range(namespace, from, to, true);
    }
@Test
    public void shouldThrowIfNoPeekNextKeyRange() {
        final ThreadCache cache = setupThreadCache(0, 0, 10000L, false);
        shouldThrowIfNoPeekNextKey(() -> cache.range(namespace, Bytes.wrap(new byte[]{0}), Bytes.wrap(new byte[]{1})));
    }