buy_cd_test.js

    describe("out of stock", function () {
        it("should throw an out of stock error", function() {
            const cd = new CD(price=9.99, stock=0);
            const payments = new StubPayments(accepted=true);
            const creditCard = {
                number: "1234234545675768",
                expiry: "10/22",
                cv: "855"

            };
            assert.throws(() => {cd.buy(payments, creditCard);}, OutOfStockError);
        })
    })