MC-21811: Canonical_url displays the backend domain instead of relative

- added test

Author: dthampy

dev/tests/api-functional/testsuite/Magento/GraphQl/Catalog/ProductCanonicalUrlTest.php

@@ -0,0 +1,80 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Catalog;
+
+use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\TestFramework\ObjectManager;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+use Magento\UrlRewrite\Model\UrlFinderInterface;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\UrlRewrite\Service\V1\Data\UrlRewrite as UrlRewriteDTO;
+
+/**
+ * Test of getting URL rewrites data from products
+ */
+class ProductCanonicalUrlTest extends GraphQlAbstract
+{
+    /** @var ObjectManager $objectManager */
+    private $objectManager;
+
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/product_simple.php
+     * @magentoConfigFixture default_store catalog/seo/product_canonical_tag 1
+     */
+    public function testProductWithCanonicalLinksMetaTagSettingsEnabled()
+    {
+        $productSku = 'simple';
+        $query
+            = <<<QUERY
+{
+    products (filter: {sku: {eq: "{$productSku}"}}) {
+        items {
+            name
+            sku
+            canonical_url
+        }
+    }
+}
+QUERY;
+
+        $response = $this->graphQlQuery($query);
+
+        $this->assertEquals(
+            $response['products']['items'][0]['canonical_url'],
+            'simple-product.html'
+        );
+        $this->assertEquals($response['products']['items'][0]['sku'], 'simple');
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Catalog/_files/product_simple.php
+     * @magentoConfigFixture default_store catalog/seo/product_canonical_tag 0
+     */
+    public function testProductWithCanonicalLinksMetaTagSettingsDisabled()
+    {
+        $productSku = 'simple';
+        $query
+            = <<<QUERY
+{
+    products (filter: {sku: {eq: "{$productSku}"}}) {
+        items {
+            name
+            sku
+            canonical_url
+        }
+    }
+}
+QUERY;
+
+        $response = $this->graphQlQuery($query);
+        $this->assertNull(
+            $response['products']['items'][0]['canonical_url']
+        );
+        $this->assertEquals($response['products']['items'][0]['sku'], 'simple');
+    }
+}