added test case for informix dialect

Author: chester89

src/FluentNHibernate.Testing/Cfg/Db/DB2ConfigurationTester.cs

@@ -13,6 +13,12 @@ public void DB2_should_default_to_the_DB2_dialect()
             DB2Configuration.Standard.ToProperties()["dialect"].ShouldEqual("NHibernate.Dialect.DB2Dialect, " + typeof(ISession).Assembly.FullName);
         }
 
+        [Test]
+        public void DB2_should_include_informix_dialect()
+        {
+            DB2Configuration.Informix1150.ToProperties()["dialect"].ShouldEqual("NHibernate.Dialect.InformixDialect1000, " + typeof(ISession).Assembly.FullName);
+        }
+
         [Test]
         public void DB2_driver_should_default_to_the_DB2_ClientDriver()
         {