스프링 빈 조회 - 상속관계

package hello.core.beanfind;

import hello.core.discount.DiscountPolicy;
import hello.core.discount.FixDiscountPolicy;
import hello.core.discount.RateDiscountPolicy;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Map;

public class ApplicationContextExtendsFindTest {

    AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(TestConfig.class);

    @Test
    @DisplayName("부모타입으로 조회 시, 자식이 둘 이상있으면, 중복 오류가 발생한다")
    void findBeanByParentTypeDuplicate() {
        //DiscountPolicy bean = ac.getBean(DiscountPolicy.class);
        Assertions.assertThrows(NoUniqueBeanDefinitionException.class,
                            () -> ac.getBean(DiscountPolicy.class));
    }

    @Test
    @DisplayName("부모타입으로 조회 시, 자식이 둘 이상있으면, 빈 이름을 지정하면 된다")
    void findBeanByParentTypeBeanName() {
        DiscountPolicy rateDiscountPolicy = ac.getBean("rateDiscountPolicy", DiscountPolicy.class);
        org.assertj.core.api.Assertions.assertThat(rateDiscountPolicy).isInstanceOf(RateDiscountPolicy.class);
    }

    @Test
    @DisplayName("하위 타입으로 조회")
    void findBeanBySubType() {
        RateDiscountPolicy bean = ac.getBean(RateDiscountPolicy.class);
        org.assertj.core.api.Assertions.assertThat(bean).isInstanceOf(RateDiscountPolicy.class);
    }

    @Test
    @DisplayName("부모 타입으로 모두 조회")
    void findAllBeanByParentType() {
        Map<String, DiscountPolicy> beansOfType = ac.getBeansOfType(DiscountPolicy.class);
        org.assertj.core.api.Assertions.assertThat(beansOfType.size()).isEqualTo(2);
        for (String key : beansOfType.keySet()) {
            System.out.println("key = " + key + " value = " + beansOfType.get(key));
        }
    }

    @Test
    @DisplayName("부모 타입으로 모두 조회 - Object")
    void findAllBeanByObjectType() {
        Map<String, Object> beansOfType = ac.getBeansOfType(Object.class);
        // 스프링이 내부적으로 사용하는 모든 bean까지 가져온다
        for (String key : beansOfType.keySet()) {
            System.out.println("key = " + key + " value = " + beansOfType.get(key));
        }
    }


    @Configuration
    static class TestConfig {
        @Bean
        public DiscountPolicy rateDiscountPolicy() {
            return new RateDiscountPolicy();
        }

        @Bean
        public DiscountPolicy fixDiscountPolicy() {
            return new FixDiscountPolicy();
        }
    }

}