### Question:
PIIS401ErrorMapper extends Psd2ErrorMapper<MessageError, Error401NGPIIS> { @Override public HttpStatus getErrorStatus() { return HttpStatus.UNAUTHORIZED; }  @Override Function<MessageError, Error401NGPIIS> getMapper(); @Override HttpStatus getErrorStatus();  }### Answer:
@Test void getErrorStatus_shouldReturn401() { HttpStatus errorStatus = piis401ErrorMapper.getErrorStatus(); assertEquals(HttpStatus.UNAUTHORIZED, errorStatus); }