i具有以下UserServiceImpl服务类：

@Service @Transactional
public class UserServiceImpl implements UserDetailsService {
    ...
    public void addRoleToUser(String username, String name) {
        User user = this.userRepository.findByUsername(username);
        Role role = this.roleRepository.findByName(name);
        user.getRoles().add(role);
    }

}

和它对应的测试类：

public class UserServiceImplTest {

    @Mock private UserRepository userRepository;
    @Mock private RoleRepository roleRepository;

    private AutoCloseable autoCloseable;

    private UserServiceImpl userServiceImpl;

    @BeforeEach
    void setUp(){
        autoCloseable = MockitoAnnotations.openMocks(this);
        userServiceImpl = new UserServiceImpl(userRepository, roleRepository);
    }

    @AfterEach
    void tearDown() throws Exception{
        autoCloseable.close();
    }

    @Test
    void testAddRoleToUser() {
        ... // user and role def. here

        userServiceImpl.addRoleToUser(username, roleName);

        // what should be here?
    }
}

但是我如何验证user.getRoles().add(role);在单元测试中被调用呢？使用mockito和ArgumentCaptor是否足够？

• 谢谢-谢谢