Android的交互器測試

Question

我有以下類，我正在試圖找出如何寫一個單元測試：

@EBean 
public class LoginInteractorImpl implements LoginInteractor { 

    private final static String LOGIN_INTERACTOR_THREAD_ID = "LOGIN_INTERACTOR_WORKER"; 

    private UserRepo mUserRepository; 
    private Call<ResponseBody> mCall; 

    @Override 
    @Background(id = LOGIN_INTERACTOR_THREAD_ID) 
    public void login(final String username, final String password, final OnLoginFinishedListener listener) { 

     mUserRepository = RetrofitHelper.createClient(UserRepo.class); 

     mCall = mUserRepository.doLogin(Credentials.basic(username, password)); 

     mCall.enqueue(new Callback<ResponseBody>() { 
      @Override 
      public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) { 
       final int code = response.code(); 
       if (code == 200) { 
        listener.onSuccess(response.headers().get("")); 
       } else if (code == 401) { 
        listener.invalidCredentialsFailure(); 
       } else if (code >= 400 && code < 500) { 
        listener.invalidCredentialsFailure(); 
       } else if (code >= 500 && code < 600) { 
        listener.noServerResponseFailure(); 
       } else { 
        APIError error = ErrorUtils.parseError(response); 
        listener.onError("Unexpected response: code:" 
         + error.getStatusCode() 
         + "message: " + error.getMessage()); 
       } 
      } 

      @Override 
      public void onFailure(Call<ResponseBody> call, Throwable t) { 
       if (t instanceof IOException) { 
        listener.noNetworkFailure(); 
       } else if(call.isCanceled()) { 
        Log.e(TAG, "request was aborted"); 
       } else { 
        listener.onError(t.getMessage()); 
       } 
      } 
     }); 
    } 

    @Override 
    public void cancel() { 
    mCall.cancel(); 
    BackgroundExecutor.cancelAll(LOGIN_INTERACTOR_THREAD_ID, true); 
    } 
} 

使用改裝我打電話我的web服務得到驗證，web服務應該返回一個Authtoken供以後使用。我無法掌握如何測試這個。我試過使用Mockito創建一個解決方案，但我無法弄清楚如何測試登錄方法的邏輯。有沒有Mockito/Retrofit的專家能指導我更接近一個可行的解決方案？

Answer 1

有相當多的是，我會嘗試任何單元測試之前，重構的幾件事情：

1）創建一個從enqueue方法中創建的匿名一個明確的回調類..可以稱之爲LoginCallback：

public class LoginCallback implements Callback{ 
    @Override 
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) { 
      final int code = response.code(); 
      if (code == 200) { 
      ... 
    } 

    @Override 
    public void onFailure(Call<ResponseBody> call, Throwable t) { 
     if (t instanceof IOException) { 
      listener.noNetworkFailure(); 
      ... 
    } 
} 

現在你對這兩個方法邏輯進行隔離單元測試。

2）將靜態方法調用移至包級別方法。你最終會是這樣的：

public class LoginInteractorImpl implements LoginInteractor { 

    public void login(final String username, final String password, final OnLoginFinishedListener listener) { 

    mUserRepository = createClient(); 

    mCall = mUserRepository.doLogin(getCredentials(username,password)); 

    mCall.enqueue(new LoginCallback()); 
    } 

    UserRepo createClient(){ 
     RetrofitHelper.createClient(UserRepo.class) 
    } 

    Credentials getCredentials(String username, String password){ 
     return Credentials.basic(username, password) 
    } 
} 

3）單元測試login方法

@RunWith(JunitMockitoRunner.class) 
public class TestClass{ 

    @Spy 
    private LoginInteractorImpl loginInterceptor= new LoginInteractorImpl(); 

    @Mock 
    private UserRepo mUserRepositoryMock; 

    @Mock 
    private Call<ResponseBody> mCallMock; 

    @Mock 
    private Credentials credentialsMock; 

    public void shouldEnqueueWhenLogin(){ 
     // Arrange 
     String username = "name"; 
     String password = "pass"; 
     Mockito.doReturn(mUserRepositoryMock).when(loginInterceptor).createClient(); 

     Mockito.doReturn(credentialsMock).when(loginInterceptor).when(getCredentials(username, password)); 

     Mockito.doReturn(mCallMock).when(mUserRepositoryMock).doLogin(credentialsMock); 

     // Act 
     loginInterceptor.login(username, password); 

     // Assert that proper callback has been passed to enqueue 
     verify(mCallMock).enqueue(Mockito.any(LoginCallback.class)); 
    } 
}