SortedListCallbackUnitTest+Test7.java

@Test public void testBatchedCallbacks() throws Exception {
    SortedList<Article> articleSortedList = new SortedList<>(Article.class,
        new SortedList.BatchedCallback<>(fixture.callbackRecorder()));
    articleSortedList.beginBatchedUpdates();
    for (int i = 0; i < fixture.shuffledArticles().size(); i++) {
      Article articleToAdd = fixture.shuffledArticles().get(i).dupe();
      articleSortedList.add(articleToAdd);
      assertThat(fixture.callbackRecorder().insertions().size()).isEqualTo(0);
    }
    articleSortedList.endBatchedUpdates();
    assertThat(fixture.callbackRecorder().insertions().size()).isEqualTo(1);
    assertThat(fixture.callbackRecorder().insertions().get(0).first).isEqualTo(0);
    assertThat(fixture.callbackRecorder().insertions().get(0).second).isEqualTo(
        fixture.shuffledArticles().size());
}