assertThat(map.entrySet())
        .containsExactly(mapEntry(AnEnum.A, "a"), mapEntry(AnEnum.C, "c"), mapEntry(AnEnum.E, "e"))
        .inOrder();
  }

  public void testToImmutableEnumMap() {
    Collector<Entry<AnEnum, Integer>, ?, ImmutableMap<AnEnum, Integer>> collector =
        toImmutableEnumMap(Entry::getKey, Entry::getValue);
    Equivalence<ImmutableMap<AnEnum, Integer>> equivalence =