@Test
public void testCardinality() {
int max = 1_000_000;
BitSet b1 = new BitSet();
RedisBitSet b2 = new RedisBitSet(Helper.getPool(), "card", max);
b2.clear();
new Random().ints(1000).forEach(i -> {
int index = Math.abs(i % max);
b1.set(index, true);
b2.set(index, true);