htable_add(&ht, hash((void *)i, NULL), (void *)i);
htable_add(&ht, hash((void *)j, NULL), (void *)j);
ok1(htable_check(&ht, "test"));
htable_add(&ht, hash((void *)i, NULL), (void *)i);
htable_add(&ht, hash((void *)j, NULL), (void *)j);
ok1(htable_check(&ht, "test"));