Testando ViewPager (e CursorLoader) com Robolectric

Alguém sabe como testar a configuração a seguir usando o Robolectric?

Fragmento contendo um ViewPager, dados carregados com um CursorLoader.

Com o código abaixo, o CursorLoader nunca é colocado no adaptador para o pager de visualização. Eu fico preso na await()ligação.

EventsFragmentTest.java:

@RunWith(CustomRobolectricTestRunner.class)
public class EventsFragmentTest extends AbstractDbAndUiDriver
{
    // which element in the view pager we are testing
    private static final int           TEST_INDEX = 0;

    protected SherlockFragmentActivity mActivity;
    protected EventsFragment_          mFragment;

    @Override
    @Before
    public void setUp() throws Exception
    {
        // create activity to hold the fragment
        this.mActivity = CustomRobolectricTestRunner.getActivity();

        // create and start the fragment
        this.mFragment = new EventsFragment_();
    }

    @Test
    public void sanityTest()
    {
        // create an event
        final Event event = this.createEvent();

        // create mock cursor loader
        final Cursor cursor = this.createMockEventCursor(event);
        this.mFragment.setCursorLoader(mock(CursorLoader.class));
        when(this.mFragment.getCursorLoader().loadInBackground()).thenReturn(cursor);
        CustomRobolectricTestRunner.startFragment(this.mActivity, this.mFragment);

        await().atMost(5, SECONDS).until(this.isCursorLoaderLoaded(), equalTo(true));

        // check for data displayed
        final TextView title = this.getTextView(R.id.event_view_title);
        final TextView text = this.getTextView(R.id.event_view_text);

        // exists and visible is enough for now
        this.getImageView(R.id.event_view_image);

        assertThat(title.getText().toString(), equalTo(event.getTitle()));
        assertThat(text.getText().toString(), is(event.getText()));

        // clean up
        cursor.close();
    }

    @Override
    protected View getRootView()
    {
        return ((ViewPager) this.mFragment.getView().findViewById(R.id.events_pager)).getChildAt(TEST_INDEX);
    }

    private Callable<Boolean> isCursorLoaderLoaded()
    {
        return new Callable<Boolean>()
        {
            public Boolean call() throws Exception
            {
                return EventsFragmentTest.this.mFragment.isCursorLoaderLoaded(); // The condition that must be fulfilled
            }
        };
    }

    /**
     * Create an event
     * 
     * @return
     */
    protected Event createEvent()
    {
        // create a random event
        final Event event = new Event();
        event.setImage(null);
        event.setLink("/some/link/" + RandomUtils.getRandomString(5)); //$NON-NLS-1$
        event.setResourceUri("/rest/uri/" + RandomUtils.getRandomDouble()); //$NON-NLS-1$
        event.setText("this is a test object " + RandomUtils.getRandomString(5)); //$NON-NLS-1$
        return event;
    }

    protected Cursor createMockEventCursor(final Event event)
    {
        // Create a mock cursor.
        final Cursor cursor = new CursorWrapper(mock(MockCursor.class));

        when(cursor.getCount()).thenReturn(1);
        when(cursor.getString(cursor.getColumnIndexOrThrow(EventTable.COLUMN_TEXT))).thenReturn(event.getText());
        when(cursor.getString(cursor.getColumnIndexOrThrow(EventTable.COLUMN_TITLE))).thenReturn(event.getTitle());
        when(cursor.getString(cursor.getColumnIndexOrThrow(EventTable.COLUMN_IMAGE))).thenReturn(event.getImage());
        when(cursor.getString(cursor.getColumnIndexOrThrow(EventTable.COLUMN_LINK))).thenReturn(event.getLink());
        when(cursor.getString(cursor.getColumnIndexOrThrow(EventTable.COLUMN_RESOURCE_URI))).thenReturn(
                        event.getResourceUri());

        // return created event
        return cursor;
    }

}

EventsFragment.java

@EFragment(resName = "events_fragment")
public class EventsFragment extends SherlockFragment implements LoaderCallbacks<Cursor>
{
    @ViewById(R.id.events_pager)
    protected ViewPager             mPager;

    @ViewById(R.id.events_indicator)
    protected CirclePageIndicator   mIndicator;

    @Pref
    protected ISharedPrefs_         mPreferences;

    protected EventsFragmentAdapter pageAdapter;

    private CursorLoader            mCursorLoader;

    /**
     * initialise the cursoradapter and the cursor loader manager.
     */
    @AfterViews
    void init()
    {
        final SherlockFragmentActivity activity = this.getSherlockActivity();

        this.pageAdapter = new EventsFragmentAdapter(activity.getSupportFragmentManager(), null);
        this.mPager.setAdapter(this.pageAdapter);
        this.mIndicator.setViewPager(this.mPager);
        this.getLoaderManager().initLoader(this.mPager.getId(), null, this);
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.LoaderManager.LoaderCallbacks#onCreateLoader(int, android.os.Bundle)
     */
    @Override
    public Loader<Cursor> onCreateLoader(final int arg0, final Bundle arg1)
    {
        if (this.mCursorLoader == null)
        {
            // set sort to newest first
            final String sortOrder = BaseColumns._ID + " DESC"; //$NON-NLS-1$

            this.mCursorLoader = new CursorLoader(this.getActivity(), EventContentProvider.CONTENT_URI,
                            EventTable.getProjection(), AbstractDbTable.getWhereCondition(null),
                            AbstractDbTable.getWhereArgs(this.mPreferences, null), sortOrder);
        }
        return this.mCursorLoader;
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.LoaderManager.LoaderCallbacks#onLoadFinished(android.support.v4.content.Loader, java.lang.Object)
     */
    @Override
    public void onLoadFinished(final Loader<Cursor> arg0, final Cursor cursor)
    {
        this.pageAdapter.swapCursor(cursor);

    }

    /* (non-Javadoc)
     * @see android.support.v4.app.LoaderManager.LoaderCallbacks#onLoaderReset(android.support.v4.content.Loader)
     */
    @Override
    public void onLoaderReset(final Loader<Cursor> arg0)
    {
        this.pageAdapter.swapCursor(null);
    }

    /**
     * Required for testing only.
     * 
     * @param cursorLoader
     */
    public void setCursorLoader(final CursorLoader cursorLoader)
    {
        this.mCursorLoader = cursorLoader;
    }

    /**
     * Required for testing only.
     * 
     * @param cursorLoader
     */
    public CursorLoader getCursorLoader()
    {
        return this.mCursorLoader;
    }

    public boolean isCursorLoaderLoaded()
    {
        return (this.pageAdapter.getCursor() != null);
    }
}

Não tenho certeza, mas aposto que o código interno está tentando usar um AsyncTaskpara invocar o loadInBackground()método do carregador do cursor . Você pode estar vendo um deadlock porque o AsyncTasktenta invocar onPostExecute(). Essa chamada tentará ser executada em seu thread de IU principal, que por acaso é o thread de sua rotina de teste. Isso nunca pode acontecer porque você está preso em uma espera com sua rotina de teste na pilha de chamadas.

Tente mover sua simulação para um nível mais alto para que nada realmente aconteça no fundo do teste. google `AsyncTask unit test android deadlock ' para ver exemplos onde outras pessoas tiveram problemas semelhantes.