public void InvalidCandidate_ReturnFalse(string candidate)
            {
                var sut = new CreditCardSpecification();

                var result = sut.IsSatisfiedBy(candidate);

                Assert.False(result);
            }
            public void InvalidCandidate_ReturnExpectedResultObject(string candidate, SpecificationResult expected)
            {
                var sut = new CreditCardSpecification();

                var overall = sut.IsSatisfiedBy(candidate, out var result);

                Assert.False(overall);
                Assert.Equal(expected, result, new SpecificationResultComparer(candidate));
            }