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    public void testManyToManyStudentSubject() throws Exception {
        StudentEntity student1 = (StudentEntity) hibernateUserDao.findUserByLogin("student1");
        assertEquals(2, student1.getSubjects().size());
    }

    public void testManyToManySubjectStudent() throws Exception {
        SubjectEntity subject = (SubjectEntity) hibernateSubjectDao.findSubjectByName("subject1");
        assertEquals(2, subject.getStudents().size());
    }

    public void testManyToOneSubjectTeacher() throws Exception {
        TeacherEntity teacher = (TeacherEntity) hibernateUserDao.findUserByLogin("teacher1");
        assertEquals(2, teacher.getSubjects().size());
    }

    public void testOneToManyTeacherSubject() throws Exception {
        TeacherEntity teacher = (TeacherEntity) hibernateUserDao.findUserByLogin("teacher1");
        for (SubjectEntity subject : teacher.getSubjects()) {
            assertEquals(teacher.getName(), subject.getTeacher().getName());
        }
    }