--- /dev/null
+<?php
+
+namespace Drupal\Tests\file\Kernel;
+
+/**
+ * Tests the file url.
+ *
+ * @group file
+ */
+class FileUrlTest extends FileManagedUnitTestBase {
+
+ /**
+ * Test public files with a different host name from settings.
+ */
+ public function testFilesUrlWithDifferentHostName() {
+ $test_base_url = 'http://www.example.com/cdn';
+ $this->setSetting('file_public_base_url', $test_base_url);
+ $filepath = file_create_filename('test.txt', '');
+ $directory_uri = 'public://' . dirname($filepath);
+ file_prepare_directory($directory_uri, FILE_CREATE_DIRECTORY);
+ $file = $this->createFile($filepath, NULL, 'public');
+ $url = file_create_url($file->getFileUri());
+ $expected_url = $test_base_url . '/' . basename($filepath);
+ $this->assertSame($url, $expected_url);
+ }
+
+}