7장 질문입니다

public class AllBeanTest {
    @Test
    void findAllBean() {
        ApplicationContext ac = new
AnnotationConfigApplicationContext(AutoAppConfig.class, DiscountService.class);
        DiscountService discountService = ac.getBean(DiscountService.class);
        Member member = new Member(1L, "userA", Grade.VIP);
        int discountPrice = discountService.discount(member, 10000,
"fixDiscountPolicy");
        assertThat(discountService).isInstanceOf(DiscountService.class);
        assertThat(discountPrice).isEqualTo(1000);
    }

    static class DiscountService {
        private final Map<String, DiscountPolicy> policyMap;
        private final List<DiscountPolicy> policies;
        public DiscountService(Map<String, DiscountPolicy> policyMap,
List<DiscountPolicy> policies) {
            this.policyMap = policyMap;
            this.policies = policies;
            System.out.println("policyMap = " + policyMap);
            System.out.println("policies = " + policies);
        }
        public int discount(Member member, int price, String discountCode) {
            DiscountPolicy discountPolicy = policyMap.get(discountCode);
            System.out.println("discountCode = " + discountCode);
            System.out.println("discountPolicy = " + discountPolicy);
            return discountPolicy.discount(member, price);
 } 
}
}

7장 조회한 빈이 모두 필요할때 테스트 코드인데요

  ApplicationContext ac = new
AnnotationConfigApplicationContext(AutoAppConfig.class, DiscountService.class);

여기서 스프링컨테이너에 등록하는건데 DiscountService는 @Configuration이나 @Component가 안붙었느데 어떻게 스프링빈으로 등록이되는거죠?