@Test
public void testChangeToTutorWhenTutor() {
when(mockUser.getRole()).thenReturn(ConstantVariables.TUTOR);
User tmpUser = userService.changeToTutor(this.mockUser);
assertEquals(this.mockUser, tmpUser);
}
@Test
public void testChangeToTutorWhenStudent() {
when(userDao.save(mockUser)).then(returnsFirstArg());
when(mockUser.getRole()).thenReturn(ConstantVariables.STUDENT);
userService.changeToTutor(this.mockUser);
verify(mockUser).setRole(ConstantVariables.TUTOR);
}