The requested qty is not available" should be received instead of Internal server error

Author: XxXgeoXxX

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/addConfigurableProductsToCartTest.php

@@ -0,0 +1,112 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote;
+
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\QuoteIdToMaskedQuoteIdInterface;
+use Magento\Quote\Model\ResourceModel\Quote as QuoteResource;
+
+class addConfigurableProductsToCartTest extends GraphQlAbstract
+{
+    /**
+     * @var QuoteResource
+     */
+    private $quoteResource;
+    /**
+     * @var Quote
+     */
+    private $quote;
+
+    /**
+     * @var QuoteIdToMaskedQuoteIdInterface
+     */
+    private $quoteIdToMaskedId;
+
+    /**
+     * @inheritdoc
+     */
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->quoteResource =  $objectManager->create(QuoteResource::class);
+        $this->quote =  $objectManager->create(Quote::class);
+        $this->quoteIdToMaskedId =  $objectManager->create(QuoteIdToMaskedQuoteIdInterface::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_simple_product_saved.php
+     * @magentoApiDataFixture Magento/Catalog/_files/multiple_mixed_products_2.php
+     */
+    public function testAddConfigurableProductsToCart()
+    {
+        $variantSku = 'simple_41';
+        $qty = 200;
+        $expectedMessage = 'GraphQL response contains errors: The requested qty is not available
+';
+        $this->quoteResource->load(
+            $this->quote,
+            'test_order_with_simple_product_without_address',
+            'reserved_order_id'
+        );
+        $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$this->quote->getId());
+        $query = $this->prepareAddConfigurableProductsToCartQuery($maskedQuoteId, $variantSku, $qty);
+
+        try {
+            $this->graphQlQuery($query);
+        } catch (\Exception $exception) {
+            $this->assertEquals(
+                $expectedMessage,
+                $exception->getMessage()
+            );
+        }
+    }
+
+    /**
+     * @param string $maskedQuoteId
+     * @param string $variantSku
+     * @param int $qty
+     *
+     * @return string
+     */
+    public function prepareAddConfigurableProductsToCartQuery(string $maskedQuoteId, string $variantSku, int $qty)
+    {
+        return <<<QUERY
+mutation {
+  
+  addConfigurableProductsToCart(
+    input: {
+      cart_id: "$maskedQuoteId", 
+      cartItems: [
+        {
+          variant_sku: "$variantSku"
+          data: {
+            qty: $qty
+            sku: "$variantSku"
+          }
+        }
+      ]
+    }
+  ) {
+    cart {
+      items {
+        id
+        qty
+        product {
+          name
+          sku
+        }
+      }
+    }
+  }
+}
+
+QUERY;
+    }
+}