public void testSerialization_entrySet() {
    Multiset<String> c = ImmutableMultiset.of("a", "b", "c");
    SerializableTester.reserializeAndAssert(c.entrySet());
  }

  public void testEquals_immutableMultiset() {
    new EqualsTester()
        .addEqualityGroup(
            ImmutableMultiset.of("a", "b", "a"),
            ImmutableMultiset.of("a", "b", "a"),
            ImmutableMultiset.of("a", "a", "b"))

  public void testSerialization_entrySet() {
    Multiset<String> c = ImmutableMultiset.of("a", "b", "c");
    SerializableTester.reserializeAndAssert(c.entrySet());
  }

  public void testEquals_immutableMultiset() {
    new EqualsTester()
        .addEqualityGroup(
            ImmutableMultiset.of("a", "b", "a"),
            ImmutableMultiset.of("a", "b", "a"),
            ImmutableMultiset.of("a", "a", "b"))

  }

  public void testSerialization_entrySet() {
    Multiset<String> c = ImmutableSortedMultiset.of("a", "b", "c");
    SerializableTester.reserializeAndAssert(c.entrySet());
  }

  public void testEquals_immutableMultiset() {
    Collection<String> c = ImmutableSortedMultiset.of("a", "b", "a");
    assertEquals(c, ImmutableSortedMultiset.of("a", "b", "a"));
    assertEquals(c, ImmutableSortedMultiset.of("a", "a", "b"));