#23440 add unit test for changed function

Author: kiudzung

app/code/Magento/Sales/Test/Unit/Model/Order/CreditmemoFactoryTest.php

@@ -0,0 +1,74 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Sales\Test\Unit\Model\Order;
+
+/**
+ * Unit test for creditmemo factory class.
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
+class CreditmemoFactoryTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * Subject of testing.
+     *
+     * @var \Magento\Sales\Model\Order\CreditmemoFactory
+     */
+    protected $subject;
+
+    /**
+     * @return void
+     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
+     */
+    protected function setUp()
+    {
+        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
+        $this->subject = $objectManager->getObject(\Magento\Sales\Model\Order\CreditmemoFactory::class, []);
+    }
+
+    /**
+     * Check if order item can be refunded
+     */
+    public function testCanRefundItem()
+    {
+        $orderItem = $this->createPartialMock(
+            \Magento\Sales\Model\Order\Item::class,
+            ['getChildrenItems', 'isDummy', 'getHasChildren', 'getId', 'getParentItemId']
+        );
+        $orderItem->expects($this->any())
+            ->method('getId')
+            ->willReturn(1);
+        $orderItem->expects($this->any())->method('getParentItemId')->willReturn(false);
+        $orderItem->expects($this->any())->method('isDummy')->willReturn(true);
+        $orderItem->expects($this->any())->method('getHasChildren')->willReturn(true);
+        $orderChildItemOne = $this->createPartialMock(
+            \Magento\Sales\Model\Order\Item::class,
+            ['getQtyToRefund', 'getId']
+        );
+        $orderChildItemOne->expects($this->any())->method('getQtyToRefund')->willReturn(1);
+        $orderChildItemOne->expects($this->any())->method('getId')->willReturn(2);
+        $orderChildItemTwo = $this->createPartialMock(
+            \Magento\Sales\Model\Order\Item::class,
+            ['getQtyToRefund', 'getId']
+        );
+        $orderChildItemTwo->expects($this->any())->method('getQtyToRefund')->willReturn(1);
+        $orderChildItemTwo->expects($this->any())->method('getId')->willReturn(3);
+        $orderItem->expects($this->any())->method('getChildrenItems')->willReturn([$orderChildItemOne, $orderChildItemTwo]);
+        $testMethod = new \ReflectionMethod(
+            \Magento\Sales\Model\Order\CreditmemoFactory::class,
+            'canRefundItem'
+        );
+        $orderItemQtys = [
+            2 => 0,
+            3 => 0
+        ];
+        $invoiceQtysRefundLimits = [];
+        $testMethod->setAccessible(true);
+        $result         = $testMethod->invoke($this->subject, $orderItem, $orderItemQtys, $invoiceQtysRefundLimits);
+        $expectedResult = true;
+        $this->assertEquals($expectedResult, $result);
+    }
+}