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