ACP2E-1066: Credit memo not genrated if order configrable product with decimal quantity

 - Added the test coverage.

Author: devarul

dev/tests/api-functional/testsuite/Magento/Sales/Service/V1/CreditMemoGenerateIfConfigurableProductWithDecimalQuantityTest.php

@@ -0,0 +1,112 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Sales\Service\V1;
+
+use Magento\Checkout\Test\Fixture\PlaceOrder as PlaceOrderFixture;
+use Magento\Checkout\Test\Fixture\SetBillingAddress as SetBillingAddressFixture;
+use Magento\Checkout\Test\Fixture\SetDeliveryMethod as SetDeliveryMethodFixture;
+use Magento\Checkout\Test\Fixture\SetGuestEmail as SetGuestEmailFixture;
+use Magento\Checkout\Test\Fixture\SetPaymentMethod as SetPaymentMethodFixture;
+use Magento\Checkout\Test\Fixture\SetShippingAddress as SetShippingAddressFixture;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Framework\Webapi\Rest\Request;
+use Magento\Sales\Api\Data\OrderInterface;
+use Magento\Sales\Test\Fixture\Invoice as InvoiceFixture;
+use Magento\TestFramework\Fixture\DataFixture;
+use Magento\TestFramework\TestCase\WebapiAbstract;
+use Magento\Framework\ObjectManagerInterface;
+use Magento\TestFramework\Fixture\DataFixtureStorage;
+use Magento\TestFramework\Fixture\DataFixtureStorageManager;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\Catalog\Test\Fixture\Product as ProductFixture;
+use Magento\ConfigurableProduct\Test\Fixture\Attribute as AttributeFixture;
+use Magento\ConfigurableProduct\Test\Fixture\Product as ConfigurableProductFixture;
+use Magento\Quote\Test\Fixture\GuestCart as GuestCartFixture;
+use Magento\ConfigurableProduct\Test\Fixture\AddProductToCart as AddConfigurableProductToCartFixture;
+
+/**
+ * Class CreditMemoGenerateIfConfigurableProductWithDecimalQuantityTest
+ */
+class CreditMemoGenerateIfConfigurableProductWithDecimalQuantityTest extends WebapiAbstract
+{
+    private const SERVICE_REFUND_ORDER_NAME = 'salesRefundOrderV1';
+
+    /**
+     * @var ObjectManagerInterface
+     */
+    private $objectManager;
+
+    /**
+     * @var DataFixtureStorage
+     */
+    private $fixtures;
+
+    protected function setUp(): void
+    {
+        $this->objectManager = Bootstrap::getObjectManager();
+        $this->fixtures = $this->objectManager->get(DataFixtureStorageManager::class)->getStorage();
+    }
+
+    #[
+        DataFixture(ProductFixture::class, ['stock_item' => ['is_qty_decimal' => true]], as: 'p1'),
+        DataFixture(ProductFixture::class, as: 'p2'),
+        DataFixture(AttributeFixture::class, as: 'attr'),
+        DataFixture(
+            ConfigurableProductFixture::class,
+            ['_options' => ['$attr$'], '_links' => ['$p1$', '$p2$']],
+            'cp1'
+        ),
+        DataFixture(GuestCartFixture::class, as: 'cart'),
+        DataFixture(
+            AddConfigurableProductToCartFixture::class,
+            ['cart_id' => '$cart.id$', 'product_id' => '$cp1.id$', 'child_product_id' => '$p1.id$', 'qty' => 2.6],
+        ),
+        DataFixture(SetBillingAddressFixture::class, ['cart_id' => '$cart.id$']),
+        DataFixture(SetShippingAddressFixture::class, ['cart_id' => '$cart.id$']),
+        DataFixture(SetGuestEmailFixture::class, ['cart_id' => '$cart.id$']),
+        DataFixture(SetDeliveryMethodFixture::class, ['cart_id' => '$cart.id$']),
+        DataFixture(SetPaymentMethodFixture::class, ['cart_id' => '$cart.id$']),
+        DataFixture(PlaceOrderFixture::class, ['cart_id' => '$cart.id$'], 'order'),
+        DataFixture(InvoiceFixture::class, ['order_id' => '$order.id$']),
+    ]
+    public function testCreditMemoGenerationWithConfigurableProductDecimalQuantity(): void
+    {
+        $order = $this->fixtures->get('order');
+        try {
+            $creditMemoResult = $this->_webApiCall(
+                $this->getServiceData($order),
+                [
+                    'orderId' => $order->getEntityId()
+                ]
+            );
+            $this->assertGreaterThan(0 , $creditMemoResult);
+        } catch (NoSuchEntityException $e) {
+            $this->fail('Failed asserting that Creditmemo was not created');
+        }
+    }
+
+    /**
+     * Prepares and returns info for API service.
+     *
+     * @param OrderInterface $order
+     *
+     * @return array
+     */
+    private function getServiceData(OrderInterface $order)
+    {
+        return [
+            'rest' => [
+                'resourcePath' => '/V1/order/' . $order->getEntityId() . '/refund',
+                'httpMethod' => Request::HTTP_METHOD_POST,
+            ],
+            'soap' => [
+                'service' => self::SERVICE_REFUND_ORDER_NAME,
+                'serviceVersion' => 'V1',
+                'operation' => self::SERVICE_REFUND_ORDER_NAME . 'execute',
+            ]
+        ];
+    }
+}