MC-26683: Removed get errors of cart allowing to add product to cart

app/code/Magento/QuoteGraphQl/Model/Cart/AddProductsToCart.php

@@ -13,7 +13,7 @@
 use Magento\Quote\Model\Quote;
 
 /**
- * Add products to cart
+ * Adding products to cart using GraphQL
  */
 class AddProductsToCart
 {
@@ -54,16 +54,6 @@ public function execute(Quote $cart, array $cartItems): void
             $this->addProductToCart->execute($cart, $cartItemData);
         }
 
-        if ($cart->getData('has_error')) {
-            $e = new GraphQlInputException(__('Shopping cart errors'));
-            $errors = $cart->getErrors();
-            foreach ($errors as $error) {
-                /** @var MessageInterface $error */
-                $e->addError(new GraphQlInputException(__($error->getText())));
-            }
-            throw $e;
-        }
-
         $this->cartRepository->save($cart);
     }
 }

app/code/Magento/QuoteGraphQl/Model/Resolver/CartItems.php

@@ -9,6 +9,7 @@
 
 use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
 use Magento\Framework\GraphQl\Query\ResolverInterface;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Quote\Model\Quote\Item as QuoteItem;
@@ -29,6 +30,12 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
         $cart = $value['model'];
 
         $itemsData = [];
+        if ($cart->getData('has_error')) {
+            $errors = $cart->getErrors();
+            foreach ($errors as $error) {
+                $itemsData[] = new GraphQlInputException(__($error->getText()));
+            }
+        }
         foreach ($cart->getAllVisibleItems() as $cartItem) {
             /**
              * @var QuoteItem $cartItem

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

@@ -8,8 +8,10 @@
 namespace Magento\GraphQl\Quote\Guest;
 
 use Exception;
+use Magento\Framework\Exception\NoSuchEntityException;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQl\ResponseContainsErrorsException;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
 
 /**
@@ -79,6 +81,57 @@ public function testAddSimpleProductToCart()
         self::assertEquals('USD', $rowTotalIncludingTax['currency']);
     }
 
+    /**
+     * Add disabled product to cart
+     *
+     * @magentoApiDataFixture Magento/Catalog/_files/multiple_products.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @return void
+     */
+    public function testAddDisabledProductToCart(): void
+    {
+        $sku = 'simple3';
+        $quantity = 2;
+
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
+
+        $this->expectException(ResponseContainsErrorsException::class);
+        $this->expectExceptionMessage(
+            'Could not add the product with SKU ' . $sku . ' to the shopping cart: ' .
+            'Product that you are trying to add is not available.'
+        );
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * Add out of stock product to cart
+     *
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/Catalog/_files/multiple_products.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/set_simple_product_out_of_stock.php
+     * @return void
+     * @throws NoSuchEntityException
+     */
+    public function testAddOutOfStockProductToCart(): void
+    {
+        $sku = 'simple1';
+        $quantity = 1;
+
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
+
+        $this->expectException(ResponseContainsErrorsException::class);
+        $this->expectExceptionMessage(
+            'Some of the products are out of stock.'
+        );
+
+        $this->graphQlMutation($query);
+    }
+
     /**
      * @expectedException Exception
      * @expectedExceptionMessage Required parameter "cart_id" is missing
@@ -191,7 +244,7 @@ public function testAddSimpleProductToCustomerCart()
     private function getQuery(string $maskedQuoteId, string $sku, float $quantity): string
     {
         return <<<QUERY
-mutation {  
+mutation {
   addSimpleProductsToCart(
     input: {
       cart_id: "{$maskedQuoteId}"