Started with api-functional tests for customer downloadable products

Author: ldusan84

dev/tests/api-functional/testsuite/Magento/GraphQl/CustomerDownloadableProduct/CustomerDownloadableProductTest.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\CustomerDownloadableProduct;
+
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+class CustomerDownloadableProductTest extends GraphQlAbstract
+{
+    /**
+     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/Downloadable/_files/product_downloadable.php
+     */
+    public function testGetCustomerDownloadableProducts()
+    {
+        $query = <<<MUTATION
+mutation {
+  generateCustomerToken(
+    email: "customer@example.com"
+    password: "password"
+  ) {
+    token
+  }
+}
+MUTATION;
+        $response = $this->graphQlMutation($query);
+        $token = $response['generateCustomerToken']['token'];
+        $this->headers = ['Authorization' => 'Bearer ' . $token];
+
+        $query = <<<QUERY
+        {
+    customerDownloadableProducts{
+        items{
+            order_increment_id
+            date
+            status
+            download_url
+            remaining_downloads
+        }
+    }
+
+}
+QUERY;
+
+        $response = $this->graphQlQuery($query, [], '', $this->headers);
+    }
+}