@Override
  public int hashCode() {
    return Objects.hash(uuid);
  }
@Test
  void hashCode_whenEmptyObjects_shouldBeTheSame() {
    PortfolioDto p1 = new PortfolioDto();
    PortfolioDto p2 = new PortfolioDto();

    int hash1 = p1.hashCode();
    int hash2 = p2.hashCode();

    assertThat(hash1).isEqualTo(hash2);
  }