public void Guid_based_entity_subclass_may_change_identity() { var tester = new GuidIdentityEntityTester(); Assert.That(tester.Id, Is.Not.EqualTo(GuidFactory.One), "It's identity should be other than one"); tester.SetId(GuidFactory.One); Assert.That(tester.Id, Is.EqualTo(GuidFactory.One)); }