ENGCOM-6767: Unit test for Magento\Reports\Observer\CheckoutCartAddProductObserver #26579

 - Merge Pull Request #26579 from karyna-tsymbal-atwix/magento2:unit-test-reports-checkoutCartAddProductObserver
 - Merged commits:
   1. c877563
   2. d2bb11c
   3. c81e728
   4. a183437

Author: magento-engcom-team

app/code/Magento/Reports/Test/Unit/Observer/CheckoutCartAddProductObserverTest.php

@@ -0,0 +1,164 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Reports\Test\Unit\Observer;
+
+use Magento\Framework\Event;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+use Magento\Quote\Model\Quote\Item as QuoteItem;
+use Magento\Reports\Model\Event as ReportsEventModel;
+use Magento\Reports\Model\ReportStatus;
+use Magento\Reports\Observer\CheckoutCartAddProductObserver;
+use Magento\Reports\Observer\EventSaver;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit Test for \Magento\Reports\Observer\CheckoutCartAddProductObserver
+ */
+class CheckoutCartAddProductObserverTest extends TestCase
+{
+    const STUB_QUOTE_PARENT_ITEM_ID = 1;
+    const STUB_QUOTE_ITEM_ID = 2;
+
+    /**
+     * @var MockObject|EventSaver
+     */
+    private $eventSaverMock;
+
+    /**
+     * @var MockObject|ReportStatus
+     */
+    private $reportStatusMock;
+
+    /**
+     * @var MockObject|Observer
+     */
+    private $eventObserverMock;
+
+    /**
+     * @var MockObject|Event
+     */
+    private $eventMock;
+
+    /**
+     * @var MockObject|QuoteItem
+     */
+    private $quoteItemMock;
+
+    /**
+     * @var CheckoutCartAddProductObserver
+     */
+    private $observer;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp()
+    {
+        $this->eventSaverMock = $this->createMock(EventSaver::class);
+        $this->reportStatusMock = $this->createMock(ReportStatus::class);
+        $this->eventObserverMock = $this->createMock(Observer::class);
+        $this->quoteItemMock = $this->createMock(QuoteItem::class);
+        $this->eventMock = $this->getMockBuilder(Event::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getItem'])
+            ->getMock();
+
+        $objectManager = new ObjectManager($this);
+        $this->observer = $objectManager->getObject(
+            CheckoutCartAddProductObserver::class,
+            [
+                'eventSaver' => $this->eventSaverMock,
+                'reportStatus' => $this->reportStatusMock
+            ]
+        );
+    }
+
+    /**
+     * The case when event has to be successfully saved
+     */
+    public function testExecuteExpectsSaveCalledWhenNewProductAdded()
+    {
+        $this->configureMocksWhenReportsEnabled();
+        $this->quoteItemMock->expects($this->once())
+            ->method('getId')
+            ->willReturn(null);
+        $this->quoteItemMock->expects($this->once())
+            ->method('getParentItem')
+            ->willReturn(null);
+
+        $this->eventSaverMock->expects($this->once())->method('save');
+        $this->observer->execute($this->eventObserverMock);
+    }
+
+    /**
+     * Test the method when 'Product Added To Cart' Report is disabled in configuration
+     */
+    public function testExecuteWhenReportsDisabled()
+    {
+        $this->reportStatusMock->expects($this->once())
+            ->method('isReportEnabled')
+            ->with(ReportsEventModel::EVENT_PRODUCT_TO_CART)
+            ->willReturn(false);
+
+        $this->checkOriginalMethodIsNeverExecuted();
+    }
+
+    /**
+     * Test when Quote Item has Id
+     */
+    public function testExecuteWithQuoteItemIdSet()
+    {
+        $this->configureMocksWhenReportsEnabled();
+        $this->quoteItemMock->expects($this->any())
+            ->method('getId')
+            ->willReturn(self::STUB_QUOTE_ITEM_ID);
+
+        $this->checkOriginalMethodIsNeverExecuted();
+    }
+
+    /**
+     * Test when Quote Item has Parent Item set
+     */
+    public function testExecuteWithQuoteParentItemIdSet()
+    {
+        $this->configureMocksWhenReportsEnabled();
+        $this->quoteItemMock->expects($this->any())
+            ->method('getParentItem')
+            ->willReturn(self::STUB_QUOTE_PARENT_ITEM_ID);
+
+        $this->checkOriginalMethodIsNeverExecuted();
+    }
+
+    /**
+     * Common mocks assertions when Report is enabled in configuration
+     */
+    private function configureMocksWhenReportsEnabled()
+    {
+        $this->reportStatusMock->expects($this->once())
+            ->method('isReportEnabled')
+            ->willReturn(true);
+        $this->eventObserverMock->expects($this->once())
+            ->method('getEvent')
+            ->willReturn($this->eventMock);
+        $this->eventMock->expects($this->once())
+            ->method('getItem')
+            ->willReturn($this->quoteItemMock);
+    }
+
+    /**
+     * Checking that the method will be never executed
+     */
+    private function checkOriginalMethodIsNeverExecuted()
+    {
+        $this->eventSaverMock->expects($this->never())->method('save');
+        $this->observer->execute($this->eventObserverMock);
+    }
+}