public void Save_WhenEntityReferencesTransientInstance_WillThrowImmediately()
{
Customer c = Om.CreateCustomer();
Order o = Om.CreateOrder();
//Order now has a reference to a transient (unsaved) Customer
o.Customer = c;
var ex = Assert.Throws <PropertyValueException>(() => Nh.CurrentSession.Save(o));
Assert.That(ex.Message, Is.StringContaining("not-null property references a null or transient value"));
}
