map.put("foo", 5);
    assertEquals("{bar=[1, 4], foo=[3, 2, 5]}", map.toString());
    assertEquals("[bar=1, foo=3, foo=2, bar=4, foo=5]", map.entries().toString());
  }

  public void testLinkedPutInOrder() {
    Multimap<String, Integer> map = create();
    map.put("foo", 1);
    map.put("bar", 2);
    map.put("bar", 3);
    assertEquals("{foo=[1], bar=[2, 3]}", map.toString());