EnumHashBiMap<Currency, String> bimap3 = EnumHashBiMap.create(emptyBimap);
    assertEquals(bimap3, emptyBimap);
  }

  public void testEnumBiMapConstructor() {
    /* Test that it copies existing entries. */
    EnumBiMap<Currency, Country> bimap1 = EnumBiMap.create(Currency.class, Country.class);
    bimap1.put(Currency.DOLLAR, Country.SWITZERLAND);