source: class AcademyServiceTest {
  
      @Autowired
      private AcademyRepository academyRepository;
      @Autowired
      private TeacherRepository teacherRepository;
      @Autowired
      private AcademyService academyService;
  
      @Test
      public void Academy여러개를_조회시_Subject가_N1_쿼리가발생한다() throws Exception {
  
target:         //given
          List<String> subjectNames = academyService.findAllSubjectNames();
  
          //then
          assertThat(subjectNames.size(), is(10));
      }
  
  }