ENGCOM-6479: [Downloadable] Cover the Observer SetHasDownloadableProductsObserver by Unit Test #26059

 - Merge Pull Request #26059 from edenduong/magento2:2.4-testcover/cover_set_has_downloadable_observer
 - Merged commits:
   1. 804e2f8
   2. 4002829

Author: magento-engcom-team

app/code/Magento/Downloadable/Test/Unit/Observer/SetHasDownloadableProductsObserverTest.php

@@ -0,0 +1,184 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Downloadable\Test\Unit\Observer;
+
+use Magento\Catalog\Model\Product\Type as ProductType;
+use Magento\Checkout\Model\Session as CheckoutSession;
+use Magento\Downloadable\Model\Product\Type as DownloadableProductType;
+use Magento\Downloadable\Observer\SetHasDownloadableProductsObserver;
+use Magento\Framework\DataObject;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+use Magento\Sales\Model\Order;
+use Magento\Sales\Model\Order\Item;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+class SetHasDownloadableProductsObserverTest extends TestCase
+{
+    /**
+     * @var ObjectManager
+     */
+    private $objectManager;
+
+    /**
+     * @var CheckoutSession|MockObject
+     */
+    private $checkoutSessionMock;
+
+    /**
+     * @var SetHasDownloadableProductsObserver
+     */
+    private $setHasDownloadableProductsObserver;
+
+    /**
+     * @var Order|MockObject
+     */
+    private $orderMock;
+
+    /**
+     * Setup environment for test
+     */
+    protected function setUp()
+    {
+        $this->objectManager = new ObjectManager($this);
+
+        $this->orderMock = $this->createPartialMock(Order::class, ['getAllItems']);
+
+        $this->checkoutSessionMock = $this->createPartialMock(
+            CheckoutSession::class,
+            [
+                'getHasDownloadableProducts',
+                'setHasDownloadableProducts'
+            ]
+        );
+
+        $this->setHasDownloadableProductsObserver = $this->objectManager->getObject(
+            SetHasDownloadableProductsObserver::class,
+            [
+                'checkoutSession' => $this->checkoutSessionMock
+            ]
+        );
+    }
+
+    /**
+     * Test execute with session has downloadable products
+     */
+    public function testExecuteWithSessionHasDownloadableProducts()
+    {
+        $event = new DataObject(['item' => $this->orderMock]);
+        $observer = new Observer(['event' => $event]);
+
+        $this->checkoutSessionMock->method('getHasDownloadableProducts')->willReturn(true);
+        $this->orderMock->method('getAllItems')->willReturn([]);
+
+        $this->checkoutSessionMock->expects($this->never())
+            ->method('setHasDownloadableProducts')->with(true);
+
+        $this->setHasDownloadableProductsObserver->execute($observer);
+    }
+
+    /**
+     * Test execute with session has no downloadable products with the data provider
+     *
+     * @dataProvider executeWithSessionNoDownloadableProductsDataProvider
+     */
+    public function testExecuteWithSessionNoDownloadableProducts($allItems, $expectedCall)
+    {
+        $event = new DataObject(['order' => $this->orderMock]);
+        $observer = new Observer(['event' => $event]);
+
+        $allOrderItemsMock = [];
+        foreach ($allItems as $item) {
+            $allOrderItemsMock[] = $this->createOrderItem(...$item);
+        }
+
+        $this->checkoutSessionMock->method('getHasDownloadableProducts')->willReturn(false);
+
+        $this->orderMock->method('getAllItems')->willReturn($allOrderItemsMock);
+
+        $this->checkoutSessionMock->expects($expectedCall)
+            ->method('setHasDownloadableProducts')->with(true);
+
+        $this->setHasDownloadableProductsObserver->execute($observer);
+    }
+
+    /**
+     * Create Order Item Mock
+     *
+     * @param string $productType
+     * @param string $realProductType
+     * @param string $isDownloadable
+     * @return Item|MockObject
+     */
+    private function createOrderItem(
+        $productType = DownloadableProductType::TYPE_DOWNLOADABLE,
+        $realProductType = DownloadableProductType::TYPE_DOWNLOADABLE,
+        $isDownloadable = '1'
+    ) {
+        $item = $this->createPartialMock(
+            Item::class,
+            ['getProductType', 'getRealProductType', 'getProductOptionByCode']
+        );
+
+        $item->expects($this->any())
+            ->method('getProductType')
+            ->willReturn($productType);
+        $item->expects($this->any())
+            ->method('getRealProductType')
+            ->willReturn($realProductType);
+        $item->expects($this->any())
+            ->method('getProductOptionByCode')
+            ->with('is_downloadable')
+            ->willReturn($isDownloadable);
+
+        return $item;
+    }
+
+    /**
+     * Data Provider for test execute with session has no downloadable product
+     *
+     * @return array
+     */
+    public function executeWithSessionNoDownloadableProductsDataProvider()
+    {
+        return [
+            'Order has one item is downloadable product' => [
+                [
+                    [
+                        DownloadableProductType::TYPE_DOWNLOADABLE,
+                        DownloadableProductType::TYPE_DOWNLOADABLE,
+                        '1'
+                    ],
+                    [
+                        ProductType::TYPE_SIMPLE,
+                        ProductType::TYPE_SIMPLE,
+                        '1'
+                    ]
+                ],
+                $this->once()
+            ],
+            'Order has all items are simple product' => [
+                [
+                    [
+                        ProductType::TYPE_SIMPLE,
+                        ProductType::TYPE_SIMPLE,
+                        '0'
+                    ],
+                    [
+                        ProductType::TYPE_SIMPLE,
+                        ProductType::TYPE_SIMPLE,
+                        '0'
+                    ]
+                ],
+                $this->never()
+            ],
+        ];
+    }
+}