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class BuyCdTest {
void buyCdPaymentAccepted() {
int stock = 10;
double price = 9.99;
String creditCardNumber = "1234";
Payments payments = new PaymentsStub(PaymentResponse.ACCEPTED);
stock = buy(stock, price, creditCardNumber, payments);
assertEquals(9, stock );
private int buy(int stock, double price, String creditCardNumber, Payments payments) {
if(payments.process(price, creditCardNumber) == PaymentResponse.ACCEPTED)
return stock;
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