SpecialPriceIndexerTest.php

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<?php
namespace Magento\ConfigurableProduct\Pricing\Price;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Catalog\Model\Indexer\Product\Price\Processor;
use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\ResourceModel\Product\Collection as ProductCollection;
use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
use Magento\TestFramework\Helper\Bootstrap;

class SpecialPriceIndexerTest extends \PHPUnit\Framework\TestCase
{
    private $productRepository;

    private $productCollectionFactory;

    private $indexerProcessor;

    protected function setUp()
    {
        $this->productRepository = Bootstrap::getObjectManager()->get(ProductRepositoryInterface::class);
        $this->productCollectionFactory = Bootstrap::getObjectManager()->get(CollectionFactory::class);
        $this->indexerProcessor = Bootstrap::getObjectManager()->get(Processor::class);
    }

    public function testFullReindexIfChildHasSpecialPrice()
    {
        $specialPrice = 2;
        $childProduct = $this->productRepository->get('simple_10', true);
        $childProduct->setData('special_price', $specialPrice);
        $this->productRepository->save($childProduct);

        $collection = $this->productCollectionFactory->create();
        $collection
            ->addPriceData()
            ->addFieldToFilter(ProductInterface::SKU, 'configurable');

        $items = array_values($collection->getItems());
        self::assertEquals(10, $items[0]->getData('min_price'));

        $this->indexerProcessor->reindexAll();

        $collection = $this->productCollectionFactory->create();
        $collection
            ->addPriceData()
            ->addFieldToFilter(ProductInterface::SKU, 'configurable');

        $item = $collection->getFirstItem();
        self::assertEquals($specialPrice, $item->getData('min_price'));
    }

    public function testOnSaveIndexationIfChildHasSpecialPrice()
    {
        $specialPrice = 2;
        $childProduct = $this->productRepository->get('simple_10', true);
        $childProduct->setData('special_price', $specialPrice);
        $this->productRepository->save($childProduct);

        $collection = $this->productCollectionFactory->create();
        $collection
            ->addPriceData()
            ->addFieldToFilter(ProductInterface::SKU, 'configurable');

        $item = $collection->getFirstItem();
        self::assertEquals($specialPrice, $item->getData('min_price'));
    }
}