GraphQL-57: Refactor Address resolve and change functional test

Author: pfantini

app/code/Magento/CustomerGraphQl/Model/Resolver/Address.php

@@ -0,0 +1,76 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\CustomerGraphQl\Model\Resolver\Address;
+
+use Magento\Customer\Api\AddressMetadataManagementInterface;
+use Magento\Customer\Api\Data\AddressInterface;
+use Magento\Framework\Api\DataObjectHelper;
+use Magento\Eav\Model\Config;
+
+/**
+ * Customers Address, used for GraphQL request processing.
+ */
+class AddressConfigProvider
+{
+    /**
+     * @var Config
+     */
+    private $eavConfig;
+
+    /**
+     * @var DataObjectHelper
+     */
+    private $dataObjectHelper;
+
+    /**
+     * @var array
+     */
+    private $addressAttributes;
+
+    /**
+     * @param Config $eavConfig
+     * @param DataObjectHelper $dataObjectHelper
+     */
+    public function __construct(
+        Config $eavConfig,
+        DataObjectHelper $dataObjectHelper
+    ) {
+        $this->eavConfig = $eavConfig;
+        $this->dataObjectHelper = $dataObjectHelper;
+        $this->addressAttributes = $this->eavConfig->getEntityAttributes(
+            AddressMetadataManagementInterface::ENTITY_TYPE_ADDRESS
+        );
+    }
+
+    /**
+     * Add $addressInput array information to a $address object
+     *
+     * @param AddressInterface $address
+     * @param array $addressInput
+     * @return AddressInterface
+     */
+    public function fillAddress(AddressInterface $address, array $addressInput) : AddressInterface
+    {
+        $this->dataObjectHelper->populateWithArray(
+            $address,
+            $addressInput,
+            AddressInterface::class
+        );
+        return $address;
+    }
+
+    /**
+     * Get address field configuration
+     *
+     * @return array
+     */
+    public function getAddressAttributes() : array
+    {
+        return $this->addressAttributes;
+    }
+}