SortedSet<Short> value = new TreeSet<Short>(Arrays.asList((short) 1));
model.setMyShortSortedSet(value);
Entity entity = meta.modelToEntity(model);
Key key = ds.put(entity);
Entity entity2 = ds.get(key);
Hoge model2 = meta.entityToModel(entity2);
assertThat(model2.getMyShortSortedSet(), is(value));
}