Edit in JSFiddle

describe('Product basket', function () {
    var productBasket;
    beforeEach(function () {
        productBasket = new ProductBasket();
    });
    describe('.productCount()', function () {
        it('returns number of products in the basket', function () {
            var productDummy1 = {},
                productDummy2 = {};
 
            productBasket.add(productDummy1);
            productBasket.add(productDummy2);
 
            expect(productBasket.productCount()).toEqual(2);
        });
    });
});