@Test(expected = RuntimeException.class) public void addAllItemsMustBeNonNull() { List<Group> groups = new ArrayList<>(); groups.add(null); groupAdapter.addAll(groups); }
public void addAllWorksWithSets() { Set<Group> groupSet = new HashSet<>(); groupSet.add(new DummyItem()); groupSet.add(new DummyItem()); groupAdapter.addAll(groupSet); Assert.assertEquals(2, groupAdapter.getItemCount()); }