/** @param cnt Count. */
private void checkPoll(int cnt) {
init();
int step = 10;
assert cnt % step == 0;
Collection<Long> set = new HashSet<>(step);
for (int i = 0; i < cnt; i++) lru.offer(0, i, i);
assertEquals(cnt, lru.size());
for (int i = 0; i < cnt; i += step) {
for (int j = 0; j < step; j++) {
long qAddr = lru.prePoll();
assertTrue(qAddr != 0);
assertTrue(set.add(qAddr));
}
for (long qAddr : set) lru.poll(qAddr);
set.clear();
}
assertEquals(0, lru.size());
}
