android - Espresso 的 IdlingResource with Retrofit 2

Question

我是 Espresso 的新手，正在尝试在 fragment 上编写测试，在 fragment 实例化时进行 Retrofit 调用。接到电话后，我想检查 fragment 以查看 View 是否存在。我正在为 fragment 使用 IdlingResource 并设置一个要调用的监听器，以便在收到响应时将 ResourceCallback 转换为空闲状态(遵循此处实现中的一些步骤:https://stackoverflow.com/a/30820189/4102823)。

我的 fragment 在用户登录并启动 MainActivity 时实例化。问题是我只是不认为我的 IdlingResource 设置正确，而且我不知道它有什么问题。它甚至在启动 fragment 并进行调用之后才构建，即使我在测试的 setUp() 方法中注册了 IdlingResource，然后再进行其他所有操作。所以，我认为这里的主要问题是我如何在运行测试时而不是在运行测试之后将 IdlingResource 与 fragment 一起实例化。问题可能出在@Rule 中吗？它会在测试可以在 fragment 上运行之前启动 MainActivity(它创建一个 NewsfeedFragment 实例)吗？如果是这样，我将如何对我的 fragment 使用规则？

这是我的 fragment :

public ProgressListener mProgressListener;
public boolean mIsProgressShown = true;

public interface ProgressListener {
    void onProgressShown();
    void onProgressDismissed();
}

public void setProgressListener(ProgressListener progressListener) {
    mProgressListener = progressListener;
}

public NewsfeedFragment() {
}

public static NewsfeedFragment newInstance() {
    return new NewsfeedFragment();
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    OSUtil.setTranslucentStatusBar(getActivity().getWindow(), this.getContext());
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    mRootView = (SwipeRefreshLayout) inflater.inflate(R.layout.fragment_newsfeed, container, false);
    mNewsfeedFramelayout = (FrameLayout) mRootView.findViewById(R.id.newsfeed_framelayout);
    mProgressView = (ProgressBar) mRootView.findViewById(R.id.newsfeed_progress);
    mPageIndictorView = (FrameLayout) mRootView.findViewById(R.id.page_indicator);
    mPageIndicator = (TextView) mRootView.findViewById(R.id.page_indicator_text);
    mRootView.setOnRefreshListener(this);

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) mRootView.findViewById(R.id.newsfeed_viewpager);
    mPageChangeListener = this;

    if (savedInstanceState != null) {
        mTabPosition = savedInstanceState.getInt(EXTRA_TAB_POSITION);
        mViewPager.setCurrentItem(mTabPosition);
    }

    fetchNewsFeed();

    return mRootView;
}

private void fetchNewsFeed() {
    if (NetworkUtils.isConnectedToInternet(getActivity())) {
        if (NetworkUtils.getService() != null) {
            if (mRootView.isRefreshing()) {
                dismissProgress();
            } else {
                showProgress();
            }
            showProgress();

            Call<Newsfeed> call = NetworkUtils.getService().getNewsfeed();
            call.enqueue(new Callback<Newsfeed>() {
                @Override
                public void onResponse(Call<Newsfeed> call, Response<Newsfeed> response) {
                    if (response.isSuccessful()) {

                        dismissProgress();
                        mNewsfeed = response.body();
                        FragmentManager fragmentManager = getChildFragmentManager();
                        mNewsfeedPagerAdapter = new NewsfeedPagerAdapter(fragmentManager, mNewsfeed.getNewsfeedItems());
}

...


    private void showProgress() {
        // show the progress and notify the listener
        if (mProgressListener != null){
            setProgressIndicatorVisible(true);
            notifyListener(mProgressListener);
        }
    }

    public void dismissProgress() {
        // hide the progress and notify the listener
        if (mProgressListener != null){
            setProgressIndicatorVisible(false);
            mIsProgressShown = false;
            notifyListener(mProgressListener);
        }
    }

    public boolean isInProgress() {
        return mIsProgressShown;
    }

    private void notifyListener(ProgressListener listener) {
        if (listener == null){
            return;
        }
        if (isInProgress()){
            listener.onProgressShown();
        }
        else {
            listener.onProgressDismissed();
        }
    }

这是 IdlingResource:

public class ProgressIdlingResource implements IdlingResource, NewsfeedFragment.ProgressListener {

private ResourceCallback mResourceCallback;
private NewsfeedFragment mNewsfeedFragment;


public ProgressIdlingResource(NewsfeedFragment fragment) {
    mNewsfeedFragment = fragment;
    mNewsfeedFragment.setProgressListener(this);
}

@Override
public String getName() {
    return "ProgressIdlingResource";
}

@Override
public boolean isIdleNow() {
    return !mNewsfeedFragment.mIsProgressShown;
}

@Override
public void registerIdleTransitionCallback(ResourceCallback callback) {
    mResourceCallback = callback;
}

@Override
public void onProgressShown() {

}

@Override
public void onProgressDismissed() {
    if (mResourceCallback == null) {
        return;
    }
    //Called when the resource goes from busy to idle.
    mResourceCallback.onTransitionToIdle();
}
}

fragment 测试:

public class NewsfeedFragmentTest {
@Before
public void setUp() throws Exception {
    Espresso.registerIdlingResources(new ProgressIdlingResource((NewsfeedFragment) MainActivity.getCurrentFragment()));
}

@Rule
public ActivityTestRule<MainActivity> mActivityTestRule = new ActivityTestRule<>(MainActivity.class);

@Test
public void getViewPager() throws Exception {
    onView(allOf(withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE),
            withId(R.id.newsfeed_viewpager))).check(matches(isDisplayed()));
}

@Test
public void getNewsfeedItems() throws Exception {
    onView(withId(R.id.page_indicator)).check(matches(isDisplayed()));
}

Answer 1

Retrofit 使用 OkHttp，并且有一种标准方法可以为此设置 IdlingResource。引用OkHttp IdlingResource