private function addProductSeven(Basket $basket)
    {
        $seven = $this->products->seven();

        $basket->add($seven->sku, $seven->name, $seven->price, function ($product) use ($seven) {
            $product->quantity($seven->quantity);
            $product->discount($seven->discount);
            $product->delivery($seven->delivery);
        });

        return $basket;
    }