Page page = new Page(builder.build());
int pageSize = serializedSize(page);
assertEquals(pageSize, 26); // page overhead
// page with one value
page = new Page(builder.appendLong(123).build());
int firstValueSize = serializedSize(page) - pageSize;
assertEquals(firstValueSize, 8 + 1); // value size + value overhead
// page with two values
page = new Page(builder.appendLong(456).build());