How do I test the NHibernate FetchMode.Eager properly?

Question

Is there any way to write an integration test to test that the FetchMode.Eager works correctly? I want to verify that it's not going to the database when I retrieve MySubObject.

The code:

public MyObject GetEager(string name)
{
    return Session
        .CreateCriteria(typeof(MyObject))
        .SetFetchMode("MySubObject", FetchMode.Eager)
        .Add(Restrictions.Eq("Name", name))
        .UniqueResult<MyObject>();
}

Answer 1

How about something like this;

MyObject testObject = new MyObject();
testObject.GetEager("a name");
testObject.Session.Close();
Assert.AreEqual(testObject.MySubObject.Id, 3425);

By closing the session and then attempting to access the associated object if the object is not eagerly loaded it will throw an exception. Conversly if it is eagrly loaded NHibernate won't attempt to access the database and so won't throw the exception.

Answer 2

You can also use NHibernateUtil.IsInitialized... as explained in this post

http://nhforge.org/wikis/howtonh/lazy-loading-eager-loading.aspx