Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/modules/simpletest/src/InstallerTestBase.php

@@ -1,10 +1,5 @@
 <?php
 
-/**
- * @file
- * Contains \Drupal\simpletest\InstallerTestBase.
- */
-
 namespace Drupal\simpletest;
 
 use Drupal\Core\DrupalKernel;
@@ -118,7 +113,7 @@ abstract class InstallerTestBase extends WebTestBase {
       ->set('app.root', DRUPAL_ROOT);
     \Drupal::setContainer($this->container);
 
-    $this->drupalGet($GLOBALS['base_url'] . '/core/install.php');
+    $this->visitInstaller();
 
     // Select language.
     $this->setUpLanguage();
@@ -164,6 +159,13 @@ abstract class InstallerTestBase extends WebTestBase {
     }
   }
 
+  /**
+   * Visits the interactive installer.
+   */
+  protected function visitInstaller() {
+    $this->drupalGet($GLOBALS['base_url'] . '/core/install.php');
+  }
+
   /**
    * Installer step: Select language.
    */