public static List<String> unwrapList(final List<Base64String> base64Strings) {
        return base64Strings.stream().map(Base64String::toString).collect(Collectors.toList());
    }
@Test
    public void testUnwrapList() {
        assertEquals(BASE64_LIST, Base64String.unwrapList(BASE64_WRAPPED_LIST));
        assertEquals(BASE64_4_LIST, Base64String.unwrapList(BASE64_4_WRAPPED_LIST));
    }