类的@injectmocks过程中获取错误

Question

这是一个服务类的服务层测试，但是我在类上使用@injectmocks时遇到了一个错误，测试pom是使用Spring Boot的Spring测试的2.2.4版本。获取误用.InjectMocksException的错误

RunWith(MockitoJUnitRunner.class)
public class JobManagerServiceTest {
  private final String categoryFullPathId = "Main/Alexa Skills/For Your Smart Home";
  private final String vendorId = "vendor5";
  private final String filters = "filters12";
  private final Long frequency = 50000L;
  @InjectMocks
  JobManagerService jobManagerService;
  @Mock
  private ScrapperService scrapperService;
  @Mock
  private AppConfiguration config;
  @Mock
  private SlackClient slackClient;
  private ExecutorService executor;
  private BlockingQueue<Category> jobQueue = new LinkedBlockingQueue<>();

 }

    private ScrapperService scrapperService;

    private AppConfiguration config;

    private ExecutorService executor;

    private SlackClient slackClient;

    private BlockingQueue<Category> jobQueue = new LinkedBlockingQueue<>();


    @Autowired
    public JobManagerService(AppConfiguration config, ScrapperService scrapperService, SlackClient slackClient) {
        this.config = config;
        this.scrapperService = scrapperService;
        this.slackClient = slackClient;
        this.executor = Executors.newFixedThreadPool(this.config.threadPoolSize);
    }
}

//错误

injectMocksException：无法实例化类型为“class com.scrapper.jobmanager.service.jobmanagerService”的名为“Job ManagerService”的@injectMocks字段。您没有在字段声明中提供实例，所以我尝试构造实例。但是，构造函数或初始化块抛出了一个异常：null

    at org.mockito.internal.runners.DefaultInternalRunner$1$1.evaluate(DefaultInternalRunner.java:43)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:74)
    at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:80)
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: java.lang.IllegalArgumentException
    at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1314)
    at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1202)
    at java.util.concurrent.Executors.newFixedThreadPool(Executors.java:89)
    at com.scrapper.jobmanager.service.JobManagerService.<init>(JobManagerService.java:39)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.mockito.internal.util.reflection.FieldInitializer$ParameterizedConstructorInstantiator.instantiate(FieldInitializer.java:269)
    at org.mockito.internal.util.reflection.FieldInitializer.acquireFieldInstance(FieldInitializer.java:137)
    at org.mockito.internal.util.reflection.FieldInitializer.initialize(FieldInitializer.java:91)
    at org.mockito.internal.configuration.injection.ConstructorInjection.processInjection(ConstructorInjection.java:46)
    at org.mockito.internal.configuration.injection.MockInjectionStrategy.process(MockInjectionStrategy.java:68)
    at org.mockito.internal.configuration.injection.MockInjectionStrategy.relayProcessToNextStrategy(MockInjectionStrategy.java:89)
    at org.mockito.internal.configuration.injection.MockInjectionStrategy.process(MockInjectionStrategy.java:71)
    at org.mockito.internal.configuration.injection.MockInjection$OngoingMockInjection.apply(MockInjection.java:92)
    at org.mockito.internal.configuration.DefaultInjectionEngine.injectMocksOnFields(DefaultInjectionEngine.java:25)
    at org.mockito.internal.configuration.InjectingAnnotationEngine.injectMocks(InjectingAnnotationEngine.java:79)
    at org.mockito.internal.configuration.InjectingAnnotationEngine.process(InjectingAnnotationEngine.java:42)
    at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:69)
    ... 19 more

提前致谢

Answer 1

@InjectMocks立即使用默认的模拟方法调用构造函数。我认为this.config.ThreadPoolSize在那里不能工作，因为您不能为字段存根。您应该在那里使用getter：

public JobManagerService(...) {
    ...
    this.executor = Executors.newFixedThreadPool(this.config.getThreadPoolSize());
}

然后，在调用构造函数之前，需要对getter进行存根处理。如果使用@injectmocks就不能这样做，只有在设置方法中初始化测试服务时才能这样做：

@Mock
private ScrapperService scrapperService;
@Mock
private AppConfiguration config;
@Mock
private SlackClient slackClient;

JobManagerService jobManagerService;

@Before
public void setup() throws IOException {
   when(config.getThreadPoolSize()).thenReturn(5);
   jobManagerService=new JobManagerService(config, scrapperService, slackClient)
}