// pass an empty instance
svoid test_List_2(L<S> l, O... _) {
  assertIndexOfAndContainsVerbose(l, "a", -1);
  l.add("a");
  assertIndexOfAndContainsVerbose(l, "a", 0);
  assertIndexOfAndContainsVerbose(l, "b", -1);
  l.add("b");
  assertIndexOfAndContainsVerbose(l, "a", 0);
  assertIndexOfAndContainsVerbose(l, "b", 1);
  l.add("a");
  assertIndexOfAndContainsVerbose(l, "a", 0);
  l.remove(2);
  assertIndexOfAndContainsVerbose(l, "a", 0);
  l.remove("a");
  assertIndexOfAndContainsVerbose(l, "a", -1);
  assertIndexOfAndContainsVerbose(l, "b", 0);
  
  l.clear();
  
  addAll(l, "a", "b", "c", "d");
  l.subList(1, 2).remove();
  assertEquals(ll("a", "d"), cloneList(l));
  
  l.clear();
}