PrivateAccessor.invoke其中的args不可为空吗? about testable-mock HOT 6 CLOSED

@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringCloudApplication.class)
@ActiveProfiles(profiles = "dev")
public class DependentServiceTest {

    @Autowired
    private DependentService dependentService;

 
    @Test
    public void testPrivateMethod() {
        //boolean result = PrivateAccessor.invoke(dependentService, "userHadJoin", "111"); // 没问题
        boolean result = PrivateAccessor.invoke(dependentService, "userHadJoin", null); // 空指针 Failed to invoke private method "userHadJoin": java.lang.NullPointerException
        //boolean result = PrivateAccessor.invoke(dependentService, "userHadJoin", "111", null);// 空指针 Failed to invoke private method "userHadJoin": java.lang.NullPointerException
        System.out.println(result);
    }
}


@Component
public class DependentService {

    public Integer submitGuess(String userId) {
        System.out.println("substring():" + userId.substring(0, 2));
        System.out.println("length():" + userId.length());
        // 查询DB
        if (userHadJoin(userId)) {
            return 0;
        }
        insertJoin(userId);
        return 1;
    }

    private Integer insertJoin(String userId) {
        //插入数据
        return 1;
    }

    private boolean userHadJoin(String userId) {
        // 查询DB
        return false;
    }

    private boolean userHadJoin(String userId, Object other) {
        // 查询DB
        return false;
    }
}