public void testSaveProduct() {
        
        List<Product> products = productDao.getProductList();
        
        for (Product p : products) {
            p.setPrice(200.12);
            productDao.saveProduct(p);
        }
        
        List<Product> updatedProducts = productDao.getProductList();
        for (Product p : updatedProducts) {
            assertEquals("wrong price of product?", 200.12, p.getPrice());
        }

    }