### Question:
PIIS400ErrorMapper extends Psd2ErrorMapper<MessageError, Error400NGPIIS> { @Override public HttpStatus getErrorStatus() { return HttpStatus.BAD_REQUEST; }  @Override Function<MessageError, Error400NGPIIS> getMapper(); @Override HttpStatus getErrorStatus();  }### Answer:
@Test void getErrorStatus_shouldReturn400() { HttpStatus errorStatus = piis400ErrorMapper.getErrorStatus(); assertEquals(HttpStatus.BAD_REQUEST, errorStatus); }