public override void Given()
        {
            MockResult = null;

            RegistrationLoader.ProcessDateofBirthChangeAsync(AoUkprn, ViewModel)
            .Returns(MockResult);
        }
        public override void Given()
        {
            MockResult.IsSuccess  = false;
            MockResult.IsModified = true;

            RegistrationLoader.ProcessDateofBirthChangeAsync(AoUkprn, ViewModel)
            .Returns(MockResult);
        }