setPurchaseSteps example

$quantityInformation = new QuantityInformation();

        $quantityInformation->setMinPurchase(
            $product->getMinPurchase() ?? 1
        );

        $quantityInformation->setMaxPurchase(
            $product->getCalculatedMaxPurchase()
        );

        $quantityInformation->setPurchaseSteps(
            $product->getPurchaseSteps() ?? 1
        );

        $lineItem->setQuantityInformation($quantityInformation);

        $purchasePrices = null;
        $purchasePricesCollection = $product->getPurchasePrices();
        if ($purchasePricesCollection !== null) {
            $purchasePrices = $purchasePricesCollection->getCurrencyPrice(Defaults::CURRENCY);
        }

        

        $cart = new Cart(Uuid::randomHex());
        $builder = new ProductLineItemFactory(new PriceDefinitionFactory());
        $salesChannelContext = $this->createMock(SalesChannelContext::class);
        $cart->add(
            $builder
                ->create(['id' => 'product-1', 'referencedId' => 'product-1'], $salesChannelContext)
                ->setQuantityInformation(
                    (new QuantityInformation())
                        ->setMinPurchase(1)
                        ->setMaxPurchase(1)
                        ->setPurchaseSteps(1)
                )
        );
        $cart->add(
            $builder
                ->create(['id' => 'product-2', 'referencedId' => 'product-2'], $salesChannelContext)
                ->setReferencedId('product-1')
                ->setQuantityInformation(
                    (new QuantityInformation())
                        ->setMinPurchase(1)
                        ->setMaxPurchase(1)
                        ->setPurchaseSteps(1)
                )