@Test
public void testSort() throws Exception {

    List<Integer> list = new ArrayList<Integer>();
    list.add(100);
    list.add(10);
    list.add(20);
    List<Integer> expected = new ArrayList<Integer>();
    expected.add(10);
    expected.add(20);
    expected.add(100);
    assertEquals(expected, CollectionUtils.sort(list));
}