}

  public void testToString() {
    Multimap<String, Integer> multimap = LinkedHashMultimap.create();
    multimap.put("foo", 3);
    multimap.put("bar", 1);
    multimap.putAll("foo", Arrays.asList(-1, 2, 4));
    multimap.putAll("bar", Arrays.asList(2, 3));
    multimap.put("foo", 1);
    assertEquals("{foo=[3, -1, 2, 4, 1], bar=[1, 2, 3]}", multimap.toString());
  }

  public void testOrderingReadOnly() {

    expected.add(ImmutableSet.of(1, 2, 3));

    Set<Set<Integer>> almostPowerSet = newHashSet(expected);
    almostPowerSet.remove(ImmutableSet.of(1, 2, 3));
    almostPowerSet.add(ImmutableSet.of(1, 2, 4));

    new EqualsTester()
        .addEqualityGroup(expected, powerSet)
        .addEqualityGroup(ImmutableSet.of(1, 2, 3))
        .addEqualityGroup(almostPowerSet)
        .testEquals();