GraphQL-604: [Test coverage] End to tests for customer checkout workflow

Author: naydav

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

@@ -47,6 +47,9 @@ public function __construct(
     }
 
     /**
+     * Create empty cart for customer
+     *
+     * @param int $customerId
      * @param string|null $predefinedMaskedQuoteId
      * @return string
      */

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

@@ -47,6 +47,8 @@ public function __construct(
     }
 
     /**
+     * Create empty cart for guest
+     *
      * @param string|null $predefinedMaskedQuoteId
      * @return string
      */

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

@@ -72,6 +72,8 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
     }
 
     /**
+     * Validate masked id
+     *
      * @param string $maskedId
      * @throws GraphQlAlreadyExistsException
      * @throws GraphQlInputException
@@ -88,6 +90,8 @@ private function validateMaskedId(string $maskedId): void
     }
 
     /**
+     * Check is quote with such maskedId already exists
+     *
      * @param string $maskedId
      * @return bool
      */