public void InvokeNullableCandidate_ReturnFalse(int?candidate, int?lessThan)
            {
                var sut = new LessThanSpecification <int?>(lessThan);

                var result = sut.GetNegationExpression().Compile().Invoke(candidate);

                Assert.False(result);
            }
            public void InvokeLessThanCandidate_ReturnFalse <T>(T candidate, T lessThan, IComparer <T> comparer)
            {
                candidate = candidate?.ToString() != "null" ? candidate : default;
                var sut = new LessThanSpecification <T>(lessThan, comparer);

                var result = sut.GetNegationExpression().Compile().Invoke(candidate);

                Assert.False(result);
            }