@Test
 public void testRemoveAll() {
   sut.add(new Word());
   sut.add(new Word());
   assertEquals(2, sut.getItemCount());
   sut.removeAll();
   assertEquals(0, sut.getItemCount());
 }
 @Test
 public void testRemoveWord() {
   Word word = new Word();
   sut.add(new Word());
   assertEquals(1, sut.getItemCount());
   sut.remove(word);
   assertEquals(0, sut.getItemCount());
 }
 @Test
 public void testOnBindViewHolder() {
   Word word = TestHelper.createWord();
   word.setFavorite(false);
   sut.add(word);
   TranslationModeUtils.init(mActivity);
   FavoritesWordsRecyclerAdapter.MainViewHolder mainViewHolder =
       sut.onCreateViewHolder(new RelativeLayout(mActivity), 0);
   sut.onBindViewHolder(mainViewHolder, 0);
   Assert.assertNotNull(mainViewHolder.mTranslationModeView);
 }
 @Test
 public void testGetItemCount() {
   sut.add(new Word());
   sut.add(new Word());
   assertEquals(2, sut.getItemCount());
 }
 @Test
 public void testCreateViewHolder() {
   assertNotNull(sut.onCreateViewHolder(new RelativeLayout(mActivity), 0));
 }