Integration test for reviews delete observer

dev/tests/integration/testsuite/Magento/Review/Observer/ProcessProductAfterDeleteEventObserverTest.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Review\Controller;
+
+use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Review\Model\ResourceModel\Review\Collection as ReviewCollection;
+use Magento\Review\Model\ResourceModel\Review\CollectionFactory as ReviewCollectionFactory;
+use Magento\TestFramework\TestCase\AbstractController;
+
+/**
+ * Test checks that product review is removed when the corresponding product is removed
+ */
+class ProcessProductAfterDeleteEventObserverTest extends AbstractController
+{
+    /**
+     * @magentoDataFixture Magento/Review/_files/customer_review.php
+     */
+    public function testReviewIsRemovedWhenProductDeleted()
+    {
+        $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+
+        /** @var ProductRepositoryInterface $productRepository */
+        $productRepository = $objectManager->get(ProductRepositoryInterface::class);
+        $product = $productRepository->get('simple');
+
+        /** @var ReviewCollection $reviewsCollection */
+        $reviewsCollection = $objectManager->get(ReviewCollectionFactory::class)->create();
+        $reviewsCollection->addEntityFilter('product', $product->getId());
+
+        self::assertEquals(1, $reviewsCollection->count());
+
+        /* Remove product and ensure that the product review is removed as well */
+        $productRepository->delete($product);
+        $reviewsCollection->clear();
+
+        self::assertEquals(0, $reviewsCollection->count());
+    }
+}