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

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

                Assert.False(result);
            }
            public void InvokeEqualCandidate_ReturnFalse <T>(T candidate, T expected, IEqualityComparer <T> comparer)
            {
                candidate = candidate?.ToString() != "null" ? candidate : default;
                var sut = new EqualSpecification <T>(expected, comparer);

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

                Assert.False(result);
            }