@Test
public void test_item_operations_adapter() {

    MultiAdapter adapter = SmartAdapter.items(mockList).adapter();
    MockModel model = new MockModel();
    adapter.addItem(model);
    verify(mockList).add(model);
    List<MockModel> modelList = Arrays.asList(new MockModel(), new MockModel());
    adapter.addItems(modelList);
    verify(mockList).addAll(modelList);
    adapter.delItem(model);
    verify(mockList).remove(model);
    adapter.clearItems();
    verify(mockList).clear();
}