def _test(db: DemoDB, save_inc: int, update_inc: int):
# init
db.int_val = 1
# save
db.int_val += save_inc
db.save()
assert_load_same(db, 1 + save_inc)
def _cb(val: DemoDB) -> Any:
val.int_val += update_inc
return val.int_val
db.update(_cb)
assert_load_same(db, 1 + save_inc + update_inc)
