模拟对象 null 用于 spring 服务 class 单元测试

Question

I have Spring Service class with multiple constructor:

@Service("async")
public class AsyncProcessor extends Processor {


    private final JobRunner JobRunner;

    private final ExecutorService executorService;

    @Autowired
    public AsyncProcessor(final MyRepo MyRepo,
                              final JobRunner JobRunner) {
        this(MyRepo, JobRunner, 1, 1, 60);
    }

    public AsyncProcessor(final MyRepo MyRepo,
                              final JobRunner JobRunner,
                              @Value("${processor.corePoolSize:1}") final int corePoolSize,
                              @Value("${processor.maxPoolSize:1}") final int maxPoolSize,
                              @Value("${processor.keepAliveTime:60}") final int keepAliveTime) {
        super(MyRepo);
        this.JobRunner = JobRunner;
        this.executorService = new ThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveTime, SECONDS, new LinkedBlockingQueue<>());
    }
    
}

I am using Junit 5 to create a service test using mocked dependencies but tripping up with an error which I am not able to solve:

here is my test class:

@ExtendWith(MockitoExtension.class)
public class MyTest {

    @Mock
    private MyRepo repo;

    @Mock
    private JobRunner jobRunner;

    @Mock
    private ExecutorService executorServiceMock;

    @InjectMocks
    private AsyncProcessor processor = new AsyncProcessor(repo, jobRunner);

    @Test
    public void shouldSubmitTaskOnExecutor() {

    }
    
}

I am getting null on the mocked repo and job runner fields and don't know why. The issue started when I added the second constructor with the additional spring property params.

Any ideas?

Answer 1

I think the new keyword is messing things up. Create a Spring @Configuration class which has a @Bean annotated method that returns the async processor generated from the newly added constructor. Your test can then autowire it, without the constructor call.