@Test
 public void testSetValueOnIndex() {
   list.add("Ann");
   list.add("Iren");
   list.add("Olga");
   list.add("Helen");
   list.add("Marina");
   list.add("Billie");
   list.set("Cat", 0);
   list.set("Dog", 1);
   list.set("Bird", 2);
   list.set("Kittie", 3);
   list.set("Doggy", 4);
   list.set("Birdy", 5);
   assertEquals("Cat", list.get(0));
   assertEquals("Dog", list.get(1));
   assertEquals("Bird", list.get(2));
   assertEquals("Kittie", list.get(3));
   assertEquals("Doggy", list.get(4));
   assertEquals("Birdy", list.get(5));
 }