Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/file/src/Tests/RemoteFileSaveUploadTest.php

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\file\Tests\RemoteFileSaveUploadTest.
+ */
+
+namespace Drupal\file\Tests;
+
+/**
+ * Tests the file uploading functions.
+ *
+ * @group file
+ */
+class RemoteFileSaveUploadTest extends SaveUploadTest {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('file_test');
+
+  protected function setUp() {
+    parent::setUp();
+    $this->config('system.file')->set('default_scheme', 'dummy-remote')->save();
+  }
+}