DAO-Business

gistfile1.txt

interface StudentDAO {
  public Iterable<Student> getStudentsByClass(String cls);
}

class StudentDAOTest {
  //mock: Database (or use in-memory database)
  //test that SQL works and queries the right thing
  
  @Test public void testGetStudentByClassReturnsAllStudentsInClass() {}
  @Test public void testGetStudentByClassThrowsExceptionWhenClassIsNull() {}
}

class StudentBusiness {
  private StudentDao studentDao;

  public Iterable<String> getGrades(String cls) {
    students = studentDao.getStudentsByClass(cls);
    //process grades and returns
  }
}

class StudentBusinessTest {
  //mock: StudentDao (supposed that StudentDao returns correct answer)
  //test that the grading method works
  
  @Test public void testGetGradesAssignsAToStudentWithScoreOf80OrMore();
  @Test public void testGetGradesAssignsBToStudentWithScoreOf60OrMore();
  ...
  ...
}