//assume this is a database
let items = [
    {
        name: "GPU",
        price: 500
    },
    {
        name: "CPU",
        price: 200
    },
    {
        name: "RAM",
        price: 80
    }
];

class Cart {
    constructor(cartItems) {
        this.cartItems = cartItems;
    }

    freeShipping() {
        if (this.getTotal() >= 750) {
            return true;
        } else {
            return false;
        }
    }

    getCart() {
        return this.cartItems;
    }

    getTotal() {
        let total = 0;
        for (let item of this.cartItems) {
            total += item.price;
        }
        return total;
    }
}

///////////////////////////////////////
let c = new Cart([items[0], items[1]]);
describe("Cart", function() {
    describe("getCart()", function() {
        it("make sure the variable is instance of cart", function() {
            expect(c).to.be.an.instanceOf(Cart);
        });
    });

    describe("freeShipping()", function() {
        it("free shipping should return true when total is greater than 750", function() {
            fullCart = new Cart(items);
            expect(fullCart.freeShipping()).to.be.true;
            expect(c.freeShipping()).to.be.false;
        });
    });
});