    @Test
    public void test_01() {


        final Member member = new Member("asd@asd.com", "name");
        final Coupon coupon = new Coupon(member);
        final List<Coupon> coupons = new ArrayList<>();
        coupons.add(coupon);
        member.setCoupons(coupons);

        System.out.println(member.toString());
    }