EnumMap<SomeEnum, Integer> copy = Maps.newEnumMap(original);
    assertEquals(original, copy);
    assertThat(copy).isNotSameInstanceAs(original);
  }

  public void testEnumMapWithInitialMap() {
    HashMap<SomeEnum, Integer> original = new HashMap<>();
    original.put(SomeEnum.SOME_INSTANCE, 0);
    EnumMap<SomeEnum, Integer> copy = Maps.newEnumMap(original);
    assertEquals(original, copy);
  }