svoid test_SynchronizedLongBufferStoredAsLinearInts() {
  var buf = new SynchronizedLongBufferStoredAsLinearInts(100, 10);
  buf.add(105);
  buf.addAll(ll(110L, 130L));
  assertEquals(110L, buf.get(0));
  assertEquals(ll(110L, 110L, 130L), buf.asVirtualList());
}