public void InvalidItemRaisesValidationMessage(int preGDPR, int postGDPR)
        {
            // arrange
            const string learnRefNumber = "123456789X";

            var preferences = Collection.Empty <IContactPreference>();

            var preference = new Mock <IContactPreference>();

            preference
            .SetupGet(y => y.ContPrefType)
            .Returns("RUI");
            preference
            .SetupGet(y => y.ContPrefCode)
            .Returns(preGDPR);

            preferences.Add(preference.Object);

            preference = new Mock <IContactPreference>();
            preference
            .SetupGet(y => y.ContPrefType)
            .Returns("RUI");
            preference
            .SetupGet(y => y.ContPrefCode)
            .Returns(postGDPR);

            preferences.Add(preference.Object);

            var mockLearner = new Mock <ILearner>();

            mockLearner
            .SetupGet(x => x.LearnRefNumber)
            .Returns(learnRefNumber);
            mockLearner
            .SetupGet(x => x.ContactPreferences)
            .Returns(preferences.AsSafeReadOnlyList());

            var handler = new Mock <IValidationErrorHandler>(MockBehavior.Strict);

            handler
            .Setup(x => x.Handle("ContPrefType_04", learnRefNumber, null, Moq.It.IsAny <IEnumerable <IErrorMessageParameter> >()));
            handler
            .Setup(y => y.BuildErrorMessageParameter("ContPrefType", "RUI"))
            .Returns(new Mock <IErrorMessageParameter>().Object);
            handler
            .Setup(y => y.BuildErrorMessageParameter("ContPrefCode", "(incompatible combination)"))
            .Returns(new Mock <IErrorMessageParameter>().Object);

            var sut = new ContPrefType_04Rule(handler.Object);

            // act
            sut.Validate(mockLearner.Object);

            // assert
            handler.VerifyAll();
        }
        public void ValidItemDoesNotRaiseValidationMessage(int preGDPR, int postGDPR)
        {
            // arrange
            const string learnRefNumber = "123456789X";

            var preferences = Collection.Empty <IContactPreference>();

            var preference = new Mock <IContactPreference>();

            preference
            .SetupGet(y => y.ContPrefType)
            .Returns("RUI");
            preference
            .SetupGet(y => y.ContPrefCode)
            .Returns(preGDPR);

            preferences.Add(preference.Object);

            preference = new Mock <IContactPreference>();
            preference
            .SetupGet(y => y.ContPrefType)
            .Returns("RUI");
            preference
            .SetupGet(y => y.ContPrefCode)
            .Returns(postGDPR);

            preferences.Add(preference.Object);

            var mockLearner = new Mock <ILearner>();

            mockLearner
            .SetupGet(x => x.LearnRefNumber)
            .Returns(learnRefNumber);
            mockLearner
            .SetupGet(x => x.ContactPreferences)
            .Returns(preferences.AsSafeReadOnlyList());

            var handler = new Mock <IValidationErrorHandler>(MockBehavior.Strict);

            var sut = new ContPrefType_04Rule(handler.Object);

            // act
            sut.Validate(mockLearner.Object);

            // assert
            handler.VerifyAll();
        }