@Test
public void testContainsIRIMethod() {

  String Data = "http://www.test.com#dataProp";
  IRI iriData = IRI.create(Data);
  ZObjectProperty zObj = new ZObjectProperty(iriData);
  String iriStr1 = "http://www.simple.com#Class";
  IRI iriclass = IRI.create(iriStr1);
  ZClass zClass = new ZClass(iriclass);
  List<ZObjectProperty> zObjectPropertyList = new ArrayList<ZObjectProperty>();
  zObjectPropertyList.add(zObj);
  zClass.setzObjectPropertyList(zObjectPropertyList);
  assertTrue(zObjectPropertyList.contains(zObj));
}