multimap.putAll("bar", asList(2, 3));
    multimap.put("foo", 1);
    assertEquals("{foo=[3, -1, 2, 4, 1], bar=[1, 2, 3]}", multimap.toString());
  }

  public void testOrderingReadOnly() {
    Multimap<String, Integer> multimap = initializeMultimap5();
    assertOrderingReadOnly(multimap);
  }

  public void testOrderingUnmodifiable() {