Junit - 如何在真实课堂上模拟字段

Question

我有一个棘手的情况。我正在使用适用于安卓的 MVP 架构，但这并不重要。我有一个名为DoStandardLoginUsecase的类，它基本上只是连接到具有登录信息的服务器并获得访问令牌。我正在尝试测试它。但问题是我传递给它的上下文，所以我可以初始化dagger。

    public class DoStandardLoginUsecase extends BaseUseCase {
    @Inject
    UserDataRepository mUserDataRepo;
    private StandardLoginInfo loginInfo;

    public DoStandardLoginUsecase(Context context) {
/* SEE HERE I AM USING A APPLICATION CONTEXT THAT I PASS TO DAGGER
*/
        ((MyApplication)context).getPresenterComponent().inject(this);
    }
    @Override
    public Observable<Login> buildUseCaseObservable() {
        return mUserDataRepo.doStandardLogin(loginInfo);
    }
    public void setLoginInfo(StandardLoginInfo loginInfo) {
        this.loginInfo = loginInfo;
    }
}

这是我到目前为止的测试：

 public class DoStandardLoginUsecaseTest {
    DoStandardLoginUsecase standardLoginUsecase;
        StandardLoginInfo fakeLoginInfo;
    TestObserver<Login> subscriber;
MockContext context;
        @Before
        public void setUp() throws Exception {
//now when i create the object since its a mock context it will fail when it tries to call real things as these are stubs.  So how do i test this object. how do i create an instance of this object ?  I am willing to use [daggerMock][1] if that helps also. 
standardLoginUsecase = New DoStandardLoginUsecase(context); 
            fakeLoginInfo = new StandardLoginInfo("[e-mail]","Asdfgh4534");
            subscriber = TestObserver.create();
        }

       @Test
        public void buildUseCaseObservable(){
standardLoginUsecase.seLoginInfo(fakeLoginInfo);
    standardLoginUsecase.buildUseCaseObservable().subscribe(subscriber);
           subscriber.assertNoErrors();
           subscriber.assertSubscribed();
           subscriber.assertComplete();
       }
    }

Answer 1

我会像这样进行测试：

 public class DoStandardLoginUsecaseTest {
      private DoStandardLoginUsecase target;
      private MyApplication contextMock;
      @Before
      public void beforeEach() {
          contextMock = Mockito.mock(MyApplication.class);
          // Note that you need to mock the getPresenterComponent
          // but I don't know what it returns.
          target = new DoStandardLoginUsecase(contextMock);
      }
      @Test
      public void buildUseCaseObservable() {
           UserDataRepository userDataMock = Mockito.mock(UserDataRepository.class);
           StandardLoginInfo loginInfoMock = Mockito.mock(StandardLoginInfo.class);
           target.mUserDataRepo = userDataMock;
           target.setLoginInfo(loginInfoMock);
           Observable<Login> expected = // create your expected test data however you like...
           Mockito.when(userDataMock.doStandardLogin(loginInfoMock)).thenReturn(expected);
           Observable<Login> actual = target.buildUseCaseObservable();
           Assert.areSame(actual, expected);
      }
 }