BackorderConditionTest.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Test\Integration\IsProductSalable;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\CatalogInventory\Api\Data\StockItemInterface;
use Magento\CatalogInventory\Api\StockItemCriteriaInterfaceFactory;
use Magento\CatalogInventory\Api\StockItemRepositoryInterface;
use Magento\Framework\Api\SearchCriteriaBuilder;
use Magento\InventoryApi\Api\Data\SourceItemInterface;
use Magento\InventoryApi\Api\SourceItemRepositoryInterface;
use Magento\InventoryApi\Api\SourceItemsSaveInterface;
use Magento\InventorySalesApi\Api\IsProductSalableInterface;
use Magento\TestFramework\Helper\Bootstrap;
use PHPUnit\Framework\TestCase;

class BackorderConditionTest extends TestCase
{
    private $sourceItemRepository;

    private $searchCriteriaBuilder;

    private $sourceItemsSave;

    private $productRepository;

    private $isProductSalable;

    private $stockItemRepository;

    private $stockItemCriteriaFactory;

    protected function setUp()
    {
        $this->productRepository = Bootstrap::getObjectManager()->get(ProductRepositoryInterface::class);
        $this->stockItemRepository = Bootstrap::getObjectManager()->get(StockItemRepositoryInterface::class);
        $this->stockItemCriteriaFactory = Bootstrap::getObjectManager()->get(
            StockItemCriteriaInterfaceFactory::class
        );
        $this->sourceItemRepository = Bootstrap::getObjectManager()->get(SourceItemRepositoryInterface::class);
        $this->searchCriteriaBuilder = Bootstrap::getObjectManager()->get(SearchCriteriaBuilder::class);
        $this->sourceItemsSave = Bootstrap::getObjectManager()->get(SourceItemsSaveInterface::class);
        $this->isProductSalable = Bootstrap::getObjectManager()->get(IsProductSalableInterface::class);
    }

    public function testBackorderedZeroQtyProductIsSalable()
    {
        $product = $this->productRepository->get('SKU-2');
        $stockItemSearchCriteria = $this->stockItemCriteriaFactory->create();
        $stockItemSearchCriteria->setProductsFilter($product->getId());
        $stockItemsCollection = $this->stockItemRepository->getList($stockItemSearchCriteria);

        $legacyStockItem = current($stockItemsCollection->getItems());
        $legacyStockItem->setBackorders(1);
        $legacyStockItem->setUseConfigBackorders(0);
        $this->stockItemRepository->save($legacyStockItem);

        $sourceItem = $this->getSourceItemBySku('SKU-2');
        $sourceItem->setQuantity(-15);
        $this->sourceItemsSave->execute([$sourceItem]);

        $this->assertTrue($this->isProductSalable->execute('SKU-2', 20));
        $this->assertTrue($this->isProductSalable->execute('SKU-2', 30));
    }

    private function getSourceItemBySku(string $sku): SourceItemInterface
    {
        $searchCriteria = $this->searchCriteriaBuilder
            ->addFilter('sku', $sku)
            ->create();
        $sourceItemSearchResult = $this->sourceItemRepository->getList($searchCriteria);

        return current($sourceItemSearchResult->getItems());
    }
}