}
            });
    ImmutableMap<AnEnum, AnEnum> copy = Maps.immutableEnumMap(map);
    assertThat(copy.entrySet()).containsExactly(mapEntry(AnEnum.A, AnEnum.A));
  }

  public void testEmptyImmutableEnumMap() {
    ImmutableMap<AnEnum, String> map = Maps.immutableEnumMap(ImmutableMap.<AnEnum, String>of());
    assertEquals(ImmutableMap.of(), map);
  }

  public void testImmutableEnumMapOrdering() {