Testing NHibernate Mappings

I’m currently in the process of moving Suteki Shop from Linq-to-SQL to NHibernate. It turns out to be a bigger job than I anticipated, and I’ll be writing a post about my experiences soon. I’m using FNH (Fluent NHibernate) to build my mapping files rather than use the tedious built-in XML mapping. One of the big jobs I have is to write unit tests for all the mapping files. For each entity, I want to have a test that creates an instance of it, saves it to the database, and retrieves it. As you can imagine, it would be a tedious task to write all these. With that in mind I’ve created a simple NUnit test that can be reused for any mapped entity

using System;
using System.Reflection;
using NUnit.Framework;
using Suteki.Common.Extensions;
using Suteki.Shop.Tests.Models.Builders;

namespace Suteki.Shop.Tests.Maps
{
   /// <summary>
   /// Runs a simple test for each entity listed. That it can be saved to the database and retrieved.
   /// </summary>
   [TestFixture]
   public class SimpleMapTests : MapTestBase
   {
       [TestCase(typeof (PostZone))]
       [TestCase(typeof (Postage))]
       [TestCase(typeof (Country))]
       public void SimpleMapTest(Type entityType)
       {
           var runSimpleMapTest = GetType().GetMethod("RunSimpleMapTest");
           var runSimpleMapTestForType = runSimpleMapTest.MakeGenericMethod(entityType);
           runSimpleMapTestForType.Invoke(this, new object[0]);
       }

       public void RunSimpleMapTest<TEntity>() where TEntity : class, new()
       {
           var id = 0;

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