@Test
public void testX509CertSignObject() {

    X509CertSignObject cert = new X509CertSignObject();
    assertNull(cert.getPem());
    
    cert.setPem("pem-value");
    assertEquals(cert.getPem(), "pem-value");
    
    cert.setExpiryTime(30);
    assertEquals(cert.getExpiryTime().intValue(), 30);
    
    List<Integer> extKeyUsage = new ArrayList<>();
    extKeyUsage.add(1);
    extKeyUsage.add(2);
    cert.setX509ExtKeyUsage(extKeyUsage);
    assertEquals(cert.getX509ExtKeyUsage(), extKeyUsage);
}