单元测试-注入空模拟组件

Question

我有以下用例：

public class MyTestClass{

 @Mock
 SomeService someService;

 @Mock 
 AnotherService anotherService;

 @InjectMock
 MainService mainService;

 @BeforeMethod
 public void init() {
   initMocks(this);
 }

 @Test
 public void test(){
  when(someService.someMethod(any())).thenReturn(something);
  when(anotherService.someMethod(any()).thenReturn(something);
  mainService.someMainMerhod();
  // ...other assert logic
 }
}

 @Component
 public class MainService{
  @Autowired
  private SomeService someService; //Why here I have null component

  private AnotherService anotherService; // and here I have an initialized component ???

  public MainService(AnotherService anotherService){
    this.anotherService = anotherService;
  }

 // implementation
}

问题2：为什么如果我只使用构造函数而不使用@Autowired或者反之亦然，那么一切都能正常工作，因为我没有加载Spring上下文...我有单元测试...

Answer 1

Javadoc指出：“Mockito将尝试只按构造函数注入、setter注入或属性注入的顺序注入模拟。如果任何策略失败，Mockito都不会报告失败；也就是说，您必须自己提供依赖项。”

因此，它将默默地失败。