builder.append("def");
    assertEquals(asList('a', 'b', 'c', 'd', 'e', 'f'), chars);
    builder.deleteCharAt(5);
    assertEquals(asList('a', 'b', 'c', 'd', 'e'), chars);
  }

  public void testNewArrayListEmpty() {
    @SuppressWarnings("UseCollectionConstructor") // test of factory method
    ArrayList<Integer> list = Lists.newArrayList();
    assertEquals(emptyList(), list);
  }