public void TestCaseOne()
{
Discover discover = new Discover(100m);
MasterCard mastercard = new MasterCard(100m);
Visa visa = new Visa(100m);
WalletType wallet = new WalletType();
wallet.AddCard(discover)
.AddCard(mastercard)
.AddCard(visa);
WalletPerson person = new WalletPerson();
person.AddWallet(wallet);
Assert.Equal(1m, discover.CalculateTotalInterest());
Assert.Equal(5m, mastercard.CalculateTotalInterest());
Assert.Equal(10m, visa.CalculateTotalInterest());
Assert.Equal(16m, person.CalculateTotalInterest());
}