### Question:
DefaultPaymentValidatorHolder implements CountryValidatorHolder { @Override public String getCountryIdentifier() { return "DE"; }  @Override String getCountryIdentifier(); @Override PaymentBodyFieldsValidator getPaymentBodyFieldsValidator(); @Override PaymentBusinessValidator getPaymentBusinessValidator(); @Override boolean isCustom();  }### Answer:
@Test void getCountryIdentifier() { assertEquals("DE", holder.getCountryIdentifier()); }