Review: add missing unit test for Observer

app/code/Magento/Review/Test/Unit/Observer/ProcessProductAfterDeleteEventObserverTest.php

@@ -0,0 +1,121 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Review\Test\Unit\Model;
+
+use Magento\Catalog\Model\Product;
+use Magento\Framework\Event;
+use Magento\Framework\Event\Observer;
+use Magento\Review\Model\ResourceModel\Rating;
+use Magento\Review\Model\ResourceModel\Review;
+use Magento\Review\Observer\ProcessProductAfterDeleteEventObserver;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject;
+
+/**
+ * Class ProcessProductAfterDeleteEventObserverTest
+ */
+class ProcessProductAfterDeleteEventObserverTest extends TestCase
+{
+    /**
+     * Testable Object
+     *
+     * @var ProcessProductAfterDeleteEventObserver
+     */
+    private $observer;
+
+    /**
+     * @var Review|PHPUnit_Framework_MockObject_MockObject
+     */
+    private $_resourceReviewMock;
+
+    /**
+     * @var Rating|PHPUnit_Framework_MockObject_MockObject
+     */
+    private $_resourceRatingMock;
+
+    /**
+     * Set up
+     */
+    protected function setUp()
+    {
+        $this->_resourceReviewMock = $this->createMock(Review::class);
+        $this->_resourceRatingMock = $this->createMock(Rating::class);
+
+        $this->observer = new ProcessProductAfterDeleteEventObserver(
+            $this->_resourceReviewMock,
+            $this->_resourceRatingMock
+        );
+    }
+
+    /**
+     * Test cleanup product reviews after product delete
+     *
+     * @return void
+     */
+    public function testCleanupProductReviewsWithProduct()
+    {
+        $productId = 1;
+        $observerMock = $this->createMock(Observer::class);
+        $eventMock = $this->getMockBuilder(Event::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getProduct'])
+            ->getMock();
+
+        $productMock = $this->getMockBuilder(Product::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getId'])
+            ->getMock();
+
+        $productMock->expects(self::exactly(3))
+            ->method('getId')
+            ->willReturn($productId);
+        $eventMock->expects($this->once())
+            ->method('getProduct')
+            ->willReturn($productMock);
+        $observerMock->expects($this->once())
+            ->method('getEvent')
+            ->willReturn($eventMock);
+        $this->_resourceReviewMock->expects($this->once())
+            ->method('deleteReviewsByProductId')
+            ->willReturnSelf();
+        $this->_resourceRatingMock->expects($this->once())
+            ->method('deleteAggregatedRatingsByProductId')
+            ->willReturnSelf();
+
+        $this->observer->execute($observerMock);
+    }
+
+    /**
+     * Test with no event product
+     *
+     * @return void
+     */
+    public function testCleanupProductReviewsWithoutProduct()
+    {
+        $observerMock = $this->createMock(Observer::class);
+        $eventMock = $this->getMockBuilder(Event::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getProduct'])
+            ->getMock();
+
+        $eventMock->expects($this->once())
+            ->method('getProduct')
+            ->willReturn(null);
+        $observerMock->expects($this->once())
+            ->method('getEvent')
+            ->willReturn($eventMock);
+        $this->_resourceReviewMock->expects($this->never())
+            ->method('deleteReviewsByProductId')
+            ->willReturnSelf();
+        $this->_resourceRatingMock->expects($this->never())
+            ->method('deleteAggregatedRatingsByProductId')
+            ->willReturnSelf();
+
+        $this->observer->execute($observerMock);
+    }
+}