public void Approval()
{
var barclayCard = new Applicant("Alan", "Faulkner", DateTime.Parse("25/10/1986"), 34000);
Assert.AreEqual("BarclayCard", barclayCard.ApproveApplication().ApplicableCreditCard.CreditCardName);
var vanquishCard = new Applicant("Alan", "Faulkner", DateTime.Parse("25/10/1986"), 18000);
Assert.AreEqual("Vanquish", vanquishCard.ApproveApplication().ApplicableCreditCard.CreditCardName);
var none = new Applicant("Alan", "Faulkner", DateTime.Parse("25/10/2012"), 34000);
Assert.AreEqual("None", none.ApproveApplication().ApplicableCreditCard.CreditCardName);
}