public void testValueType() {
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(Currency.class, Country.class);
    assertEquals(Country.class, bimap.valueType());
  }

  public void testIterationOrder() {
    // The enum orderings are alphabetical, leading to the bimap and its inverse
    // having inconsistent iteration orderings.
    Map<Currency, Country> map =
        ImmutableMap.of(

        .addEqualityGroup(ImmutableMultiset.of("a", "b"))
        .addEqualityGroup(ImmutableMultiset.of("a", "b", "c", "d"))
        .testEquals();
  }

  public void testIterationOrder() {
    Collection<String> c = ImmutableMultiset.of("a", "b", "a");
    assertThat(c).containsExactly("a", "a", "b").inOrder();
    assertThat(ImmutableMultiset.of("c", "b", "a", "c").elementSet())

        .addEqualityGroup(ImmutableMultiset.of("a", "b"))
        .addEqualityGroup(ImmutableMultiset.of("a", "b", "c", "d"))
        .testEquals();
  }

  public void testIterationOrder() {
    Collection<String> c = ImmutableMultiset.of("a", "b", "a");
    assertThat(c).containsExactly("a", "a", "b").inOrder();
    assertThat(ImmutableMultiset.of("c", "b", "a", "c").elementSet())

    assertThat(c).isNotEqualTo(ImmutableSortedMultiset.of("a", "b"));
    assertThat(c).isNotEqualTo(ImmutableSortedMultiset.of("a", "b", "c", "d"));
  }

  public void testIterationOrder() {
    Collection<String> c = ImmutableSortedMultiset.of("a", "b", "a");
    assertThat(c).containsExactly("a", "a", "b").inOrder();
  }

  public void testMultisetWrites() {