magento/graphql-ce#890: [Checkout] Replace usage of CartItemQuantity with CartItemInterface

Author: lenaorobei

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

@@ -68,10 +68,13 @@ public function execute(QuoteAddress $address): array
             } else {
                 $itemId = $addressItem->getQuoteItemId();
             }
-
+            $productData = $addressItem->getProduct()->getData();
+            $productData['model'] = $addressItem->getProduct();
             $addressItemsData[] = [
-                'cart_item_id' => $itemId,
-                'quantity' => $addressItem->getQty()
+                'id' => $itemId,
+                'quantity' => $addressItem->getQty(),
+                'product' => $productData,
+                'model' => $addressItem,
             ];
         }
         $addressData['cart_items'] = $addressItemsData;

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

@@ -137,8 +137,11 @@ private function getQuery(string $maskedQuoteId): string
   cart (cart_id: "{$maskedQuoteId}") {
     shipping_addresses {
       cart_items {
-        cart_item_id
+        id
         quantity
+        product {
+          sku
+        }
       }
       available_shipping_methods {
         amount {