회원기능 테스트에서 질문드립니다.

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-devtools'
    compile('com.github.gavlyukovskiy:p6spy-spring-boot-starter:1.5.7')
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'com.h2database:h2'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

spring:
  datasource:
    url: jdbc:h2:tcp://localhost/~/Dev/projects/book/db;MVCC=TRUE
    username: sa
    password:
    driver-class-name: org.h2.Driver

  jpa:
    hibernate:
      ddl-auto: create
    properties:
      hibernate:
        show_sql: true
        format_sql: true

logging:
  level:
    org.hibernate.SQL: debug
    org.hibernate.type: trace

package com.ym.book.shop.service;

import com.ym.book.shop.domain.entity.Member;
import com.ym.book.shop.repository.MemberRepository;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Transactional;

import static org.junit.Assert.*;

@RunWith(SpringRunner.class)
@SpringBootTest
@Transactional
public class MemberServiceTest {
    @Autowired
    MemberService memberService;
    @Autowired
    MemberRepository memberRepository;

    @Test
    public void 회원가입()throws Exception{
        //given
        Member member = new Member();
        member.setName("Kim");
        //when
        Long saveId = memberService.join(member);
        //then
        assertEquals(member, memberRepository.findOne(saveId));
    }

    @Test
    public void 중복_회원_예외()throws Exception{
        //given

        //when

        //then
    }

}
결과 :
2019-10-06 14:52:56.074  INFO 2244 --- [    Test worker] o.h.h.i.QueryTranslatorFactoryInitiator  : HHH000397: Using ASTQueryTranslatorFactory
2019-10-06 14:52:56.173 DEBUG 2244 --- [    Test worker] org.hibernate.SQL                        : 
    select
        member0_.member_id as member_i1_4_,
        member0_.city as city2_4_,
        member0_.street as street3_4_,
        member0_.zipcode as zipcode4_4_,
        member0_.name as name5_4_ 
    from
        member member0_ 
    where
        member0_.name=?
Hibernate: 
    select
        member0_.member_id as member_i1_4_,
        member0_.city as city2_4_,
        member0_.street as street3_4_,
        member0_.zipcode as zipcode4_4_,
        member0_.name as name5_4_ 
    from
        member member0_ 
    where
        member0_.name=?
2019-10-06 14:52:56.204 DEBUG 2244 --- [    Test worker] org.hibernate.SQL                        : 
    insert 
    into
        member
        (member_id, city, street, zipcode, name) 
    values
        (null, ?, ?, ?, ?)
Hibernate: 
    insert 
    into
        member
        (member_id, city, street, zipcode, name) 
    values
        (null, ?, ?, ?, ?)
2019-10-06 14:52:56.216  INFO 2244 --- [    Test worker] o.s.t.c.transaction.TransactionContext   : Rolled back transaction for test: [DefaultTestContext@4d40c3e testClass = MemberServiceTest, testInstance = com.ym.book.shop.service.MemberServiceTest@b322034, testMethod = 회원가입@MemberServiceTest, testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@1ee9b049 testClass = MemberServiceTest, locations = '{}', classes = '{class com.ym.book.shop.ShopApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@275315df, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@47bf348f, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@7db5eaa6, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@2cda0ac3], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true]]
2019-10-06 14:52:56.223  INFO 2244 --- [       Thread-6] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2019-10-06 14:52:56.223  INFO 2244 --- [       Thread-6] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2019-10-06 14:52:56.226  INFO 2244 --- [       Thread-6] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2019-10-06 14:52:56.231  INFO 2244 --- [       Thread-6] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
BUILD SUCCESSFUL in 5s
5 actionable tasks: 3 executed, 2 up-to-date
2:52:56 PM: Tasks execution finished ':cleanTest :test --tests "com.ym.book.shop.service.MemberServiceTest.회원가입"'.

이렇게 결과가 나옵니다.
select, insert가 2번씩 실행이 되는데요
혹시 제가 설정이 잘못된 게 있을까요?

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "member_id")
private  Long id;