list.add(1, "4");
        assertThat(list.get(1), is("4"));
        assertThat(list.get(2), is("2"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testIndexOf() throws Exception {
        list.addLast(null);
        list.addLast("1");
        list.addLast("2");
        list.addLast("3");
        assertThat(list.indexOf(null), is(0));