@Test
public void isRedundantOneEmptyList() {

  // first list empty
  list1.add(s1);
  c = new Change(mockSetting, list1, list2);
  assertFalse(c.isRedundant());
  // second list empty
  list1.remove(s1);
  list2.add(s1);
  c = new Change(mockSetting, list1, list2);
  assertFalse(c.isRedundant());
}