@Nullable
  public IssueStatus getIssueStatus() {
    return IssueStatus.of(status, resolution);
  }
@Test
  void getIssueStatus_shouldReturnOpen_whenStatusIsNull() {
    IssueDto dto = new IssueDto();
    assertThat(dto.getIssueStatus())
      .isEqualTo(IssueStatus.OPEN);
  }