gistfile1.cs

var fail = false;
			var configuration = new Configuration().Configure();
			configuration.Properties[Environment.ShowSql] = "false";
			var sessionFactory = configuration.BuildSessionFactory();

			using (var session = sessionFactory.OpenSession())
			{
				var allClassMetadata = session.SessionFactory.GetAllClassMetadata();

				foreach (var entry in allClassMetadata)
				{
					try
					{
						session.CreateCriteria(entry.Key)
							.SetMaxResults(0).List();

						Console.WriteLine("{0} mapping is ok.", entry.Key);
	
					}catch(Exception ex)
					{
						Console.WriteLine("{0} mapping is wrong. See the exception message:", entry.Key);
						Console.WriteLine(ex.Message);
						fail = true;
					}
					
				}
			}
			Assert.IsFalse(fail);