diff --git a/app/code/Magento/QuoteGraphQl/Model/Resolver/CartAddressTypeResolver.php b/app/code/Magento/QuoteGraphQl/Model/Resolver/CartAddressTypeResolver.php
index 14c1dc76590a..6f7c70b09cb0 100644
--- a/app/code/Magento/QuoteGraphQl/Model/Resolver/CartAddressTypeResolver.php
+++ b/app/code/Magento/QuoteGraphQl/Model/Resolver/CartAddressTypeResolver.php
@@ -20,7 +20,7 @@ class CartAddressTypeResolver implements TypeResolverInterface
     /**
      * @inheritdoc
      */
-    public function resolveType(array $data) : string
+    public function resolveType(array $data): string
     {
         if (!isset($data['model'])) {
             throw new LocalizedException(__('Missing key "model" in cart address data'));
@@ -33,7 +33,7 @@ public function resolveType(array $data) : string
         } elseif ($address->getAddressType() == AbstractAddress::TYPE_BILLING) {
             $addressType = 'BillingCartAddress';
         } else {
-            throw new LocalizedException( __('Unsupported cart address type'));
+            throw new LocalizedException(__('Unsupported cart address type'));
         }
         return $addressType;
     }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php
index 1633c83895e6..6f27693eeb4a 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/AddProductToCartTest.php
@@ -71,13 +71,13 @@ public function testAddMoreProductsThatAllowed()
      * @expectedException \Exception
      * @expectedExceptionMessage Please enter a number greater than 0 in this field.
      */
-    public function testAddSimpleProductToCartWithNegativeQty()
+    public function testAddSimpleProductToCartWithNegativeQuantity()
     {
         $sku = 'simple';
-        $qty = -2;
+        $quantity = -2;
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
 
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
         $this->graphQlMutation($query);
     }
 
@@ -88,10 +88,10 @@ public function testAddSimpleProductToCartWithNegativeQty()
     public function testAddProductIfQuantityIsDecimal()
     {
         $sku = 'simple_product';
-        $qty = 0.2;
+        $quantity = 0.2;
 
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
-        $query = $this->getQuery($maskedQuoteId, $sku, $qty);
+        $query = $this->getQuery($maskedQuoteId, $sku, $quantity);
 
         $this->expectExceptionMessage(
             "Could not add the product with SKU {$sku} to the shopping cart: The fewest you may purchase is 1"
@@ -102,10 +102,10 @@ public function testAddProductIfQuantityIsDecimal()
     /**
      * @param string $maskedQuoteId
      * @param string $sku
-     * @param float $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, string $sku, float $qty) : string
+    private function getQuery(string $maskedQuoteId, string $sku, float $quantity) : string
     {
         return <<<QUERY
 mutation {  
@@ -115,7 +115,7 @@ private function getQuery(string $maskedQuoteId, string $sku, float $qty) : stri
       cartItems: [
         {
           data: {
-            quantity: $qty
+            quantity: $quantity
             sku: "$sku"
           }
         }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/UpdateCartItemsTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/UpdateCartItemsTest.php
index b13277136fad..3b238f864163 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/UpdateCartItemsTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/CatalogInventory/UpdateCartItemsTest.php
@@ -41,26 +41,26 @@ protected function setUp()
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
      */
-    public function testUpdateCartItemDecimalQty()
+    public function testUpdateCartItemDecimalQuantity()
     {
         $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
         $itemId = $this->getQuoteItemIdByReservedQuoteIdAndSku->execute('test_quote', 'simple_product');
 
-        $qty = 0.5;
+        $quantity = 0.5;
         $this->expectExceptionMessage(
             "Could not update the product with SKU simple_product: The fewest you may purchase is 1"
         );
-        $query = $this->getQuery($maskedQuoteId, $itemId, $qty);
+        $query = $this->getQuery($maskedQuoteId, $itemId, $quantity);
         $this->graphQlMutation($query);
     }
 
     /**
      * @param string $maskedQuoteId
      * @param int $itemId
-     * @param float $qty
+     * @param float $quantity
      * @return string
      */
-    private function getQuery(string $maskedQuoteId, int $itemId, float $qty): string
+    private function getQuery(string $maskedQuoteId, int $itemId, float $quantity): string
     {
         return <<<QUERY
 mutation {
@@ -69,14 +69,14 @@ private function getQuery(string $maskedQuoteId, int $itemId, float $qty): strin
     cart_items:[
       {
         cart_item_id: {$itemId}
-        quantity: {$qty}
+        quantity: {$quantity}
       }
     ]
   }) {
     cart {
       items {
         id
-        qty
+        quantity
       }
     }
   }
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetSpecifiedBillingAddressTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetSpecifiedBillingAddressTest.php
index 48bff7322689..68e99feb5fae 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetSpecifiedBillingAddressTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetSpecifiedBillingAddressTest.php
@@ -100,7 +100,7 @@ public function testGeSpecifiedBillingAddressIfBillingAddressIsNotSet()
                 'label' => null,
             ],
             'telephone' => null,
-            '__typename' => 'BillingCartAddress',
+            '__typename' => null,
         ];
         self::assertEquals($expectedBillingAddressData, $response['cart']['billing_address']);
     }