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How would you test this scenario? I've just started looking into NHibernate and having my first bash at TDD. So far I've really enjoyed it and have been using fluent-Nhibernate for my mapping of the classes. However I seem to be hitting a dead end when it comes to using the VerifyTheMappings method on PersistenceSpecification. Essentially I have two classes, Recipient and RecipientList. The RecipientList class has a mapping to the Recipient with a fluent "HasMany" relationship: public class RecipientListMap : ClassMap<RecipientList> { public RecipientListMap() { Id(x => x.ID); Map(x => x.ApplicationID); Map(x => x.Name); Map(x => x.IsDeleted); HasMany<Recipient>(x => x.Recipients).WithKeyColumn("RecipientListID").AsList().LazyLoad(); } } However when I use the following code in my test: private IList<Recipient> _recipients = new List<Recipient>() { new Recipient { FirstName = "Joe", LastName = "Bloggs", Email = "joe@bloggs.com", IsDeleted = false }, new Recipient { FirstName = "John", LastName = "Doe", Email = "john@doe.com", IsDeleted = false }, new Recipient { FirstName = "Jane", LastName = "Smith", Email = "john@smith.com", IsDeleted = false } }; [Test] public void Can_Add_RecipientList_To_Database() { new PersistenceSpecification<RecipientList>(Session) .CheckProperty(x => x.Name, "My List") .CheckProperty(x => x.Columns, "My columns") .CheckProperty(x => x.IsDeleted, false) .CheckProperty(x => x.ApplicationID, Guid.NewGuid()) .CheckProperty(x => x.Recipients, _recipients) .VerifyTheMappings(); } The following error occurs: failed: System.ApplicationEx

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