public void IfEqualsReturnTrueObjectsHaveDifferentHash()
 {
     Assert.AreNotEqual(_item1.GetHashCode(), _item3.GetHashCode());
 }
 public void IfEqualsReturnTrueObjectsHaveSameHash()
 {
     Assert.AreEqual(_item1.GetHashCode(), _item2.GetHashCode());
 }