public void InvalidItemRaisesValidationMessage(string candidate, params string[] conflicts)
        {
            const string learnRefNumber = "123456789X";

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

            handler
            .Setup(x => x.Handle("ContPrefType_02", learnRefNumber, null, Moq.It.IsAny <IEnumerable <IErrorMessageParameter> >()));

            var preferences = new List <IContactPreference>();

            var preference = new Mock <IContactPreference>();

            preference
            .SetupGet(y => y.ContPrefType)
            .Returns(candidate.Substring(0, 3));
            preference
            .SetupGet(y => y.ContPrefCode)
            .Returns(int.Parse(candidate.Substring(3)));
            preferences.Add(preference.Object);

            conflicts.ForEach(x =>
            {
                var prefType = x.Substring(0, 3);
                var prefCode = int.Parse(x.Substring(3));

                var conflict = new Mock <IContactPreference>();
                conflict
                .SetupGet(y => y.ContPrefType)
                .Returns(x.Substring(0, 3));
                conflict
                .SetupGet(y => y.ContPrefCode)
                .Returns(int.Parse(x.Substring(3)));

                handler
                .Setup(y => y.BuildErrorMessageParameter("ContPrefType", prefType))
                .Returns(new Mock <IErrorMessageParameter>().Object);
                handler
                .Setup(y => y.BuildErrorMessageParameter("ContPrefCode", prefCode))
                .Returns(new Mock <IErrorMessageParameter>().Object);

                preferences.Add(conflict.Object);
            });

            var mockLearner = new Mock <ILearner>();

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

            var sut = new ContPrefType_02Rule(handler.Object);

            sut.Validate(mockLearner.Object);

            handler.VerifyAll();
        }
        public void ValidItemDoesNotRaiseValidationMessage(params string[] candidates)
        {
            // arrange
            const string learnRefNumber = "123456789X";

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

            candidates.ForEach(x =>
            {
                var prefType = x.Substring(0, 3);
                var prefCode = int.Parse(x.Substring(3));

                var conflict = new Mock <IContactPreference>();
                conflict
                .SetupGet(y => y.ContPrefType)
                .Returns(x.Substring(0, 3));
                conflict
                .SetupGet(y => y.ContPrefCode)
                .Returns(int.Parse(x.Substring(3)));

                preferences.Add(conflict.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_02Rule(handler.Object);

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

            // assert
            handler.VerifyAll();
        }