def test_order_by_selectable_in_unions(self):
        table = self.tables.some_table
        s1 = select([table]).where(table.c.id == 2).order_by(table.c.id)
        s2 = select([table]).where(table.c.id == 3).order_by(table.c.id)

        u1 = union(s1, s2).limit(2)
        self._assert_result(u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)])