public void Should_get_null_list_when_entities_are_not_found_in_repository()
{
var criteria = MockRepository.GenerateMock<ICriteria>();
_session.Stub(x => x.CreateCriteria(typeof(IEntity))).Return(criteria);
criteria.Stub(x => x.List<IEntity>()).Return(null);
var actual = CreateSUT().GetAllEntities();
Assert.That(actual, Is.Null);
}