android - Prueba de ViewPager(y CursorLoader) con Robolectric

android-testing android-cursorloader

Question

¿Alguien sabe cómo probar la siguiente configuración usando Robolectric?

Fragmento que contiene una ViewPager, datos cargados con un CursorLoader.

Con el siguiente código, el CursorLoader nunca se inserta en el adaptador para el buscapersonas. Me quedo atrapado en la llamada de await() .

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);
}
}

Answer 1

No estoy seguro, pero AsyncTask a que el código interno está tratando de usar una AsyncTask para invocar el método loadInBackground() del cargador de cursor. Es posible que esté viendo un punto muerto porque AsyncTask intenta invocar onPostExecute() . Esa llamada intentará ejecutarse en su subproceso principal de IU, que es el hilo de la rutina de prueba. Eso nunca puede suceder porque estás atrapado en una espera con tu rutina de prueba en la pila de llamadas.

Intente mover su burla a un nivel superior para que no ocurra nada en el fondo de la prueba. google `AsyncTask unit test android deadlock '' para ver ejemplos donde otras personas se encontraron con problemas similares.