ProviderTestCase2.getProvider() is null

I'm trying to test a ContentProvider class, and can't make it work.

getProvider() keeps returning null, but as I understand from the ProviderTestCase2.setUp() code, it shouldn't.

public class NotesProviderTest extends ProviderTestCase2<NotesProvider>
{
    ...

    public NotesProviderTest()
    {
        super(NotesProvider.class, Contract.AUTHORITY);
    }

    @Override
    protected void setUp() throws Exception
    {
        super.setUp();

    }

    public void testNoteProvider__inserts_a_valid_record() throws Exception
    {
        Note note = new Note(new JSONObject(simpleNoteJson));

        NotesProvider provider = getProvider();

        Uri insert = provider.insert(Note.URI, note.getContentValues());
        assertEquals(1L, ContentUris.parseId(insert));

        Cursor cursor = provider.query(Note.URI, null, null, new String[]{}, null);

        assertNotNull(cursor);

        cursor.close();
    }
}

Side note: the provider works if used within the app.

Thanks in advance.