public void Relations()
        {
            IEnumerable <WeightedComparisonPairDto> voting = new List <WeightedComparisonPairDto>
            {
                new WeightedComparisonPairDto
                {
                    Id        = "0",
                    Selection = Selection.A
                },
                new WeightedComparisonPairDto
                {
                    Id        = "1",
                    Selection = Selection.B
                },
                new WeightedComparisonPairDto
                {
                    Id        = "2",
                    Selection = Selection.B
                },
            };

            IEnumerable <ComparisonPair> comparisonPairs = new List <ComparisonPair>
            {
                new ComparisonPair
                {
                    Id     = "0",
                    IndexA = 0,
                    IndexB = 1,
                },
                new ComparisonPair
                {
                    Id     = "1",
                    IndexA = 0,
                    IndexB = 2,
                },
                new ComparisonPair
                {
                    Id     = "2",
                    IndexA = 1,
                    IndexB = 2,
                },
            };
            var result = Weighting.Create_Relations(voting, comparisonPairs).ToList();

            AssertIndize(result[0], 0, 1);
            AssertIndize(result[1], 2, 0);
            AssertIndize(result[2], 2, 1);
        }