buildPromotion example

$container->get('promotion_setgroup.repository'),
            $container->get('promotion_discount.repository')
        );
    }

    protected function getCart(
        PromotionFixtureBuilder $promotionBuilder,
        string $productId1,
        string $productId2,
        string $code
    ): Cart {
        $promotionBuilder->buildPromotion();

        $cart = $this->cartService->getCart($this->context->getToken(), $this->context);

        // add 3 items to our cart         // the cheapest one 1x and 2x the other product         $cart = $this->addProduct($productId1, 2, $cart, $this->cartService, $this->context);
        $cart = $this->addProduct($productId2, 1, $cart, $this->cartService, $this->context);

        // add our promotion         $cart = $this->addPromotionCode($code, $cart, $this->cartService, $this->context);