public MemoryLRUCacheBytesIterator range(final String namespace, final Bytes from, final Bytes to) {
        return range(namespace, from, to, true);
    }
@Test
    public void shouldPeekNextKey() {
        final ThreadCache cache = setupThreadCache(0, 1, 10000L, false);
        final Bytes theByte = Bytes.wrap(new byte[]{0});
        final ThreadCache.MemoryLRUCacheBytesIterator iterator = cache.range(namespace, theByte, Bytes.wrap(new byte[]{1}));
        assertEquals(theByte, iterator.peekNextKey());
        assertEquals(theByte, iterator.peekNextKey());
    }