Update to Drupal 8.1.8. For more information, see https://www.drupal.org/project/drupal/releases/8.1.8

core/modules/simpletest/src/UserCreationTrait.php

@@ -77,6 +77,8 @@ trait UserCreationTrait {
 
     // Add the raw password so that we can log in as this user.
     $account->pass_raw = $edit['pass'];
+    // Support BrowserTestBase as well.
+    $account->passRaw = $account->pass_raw;
     return $account;
   }
 

core/modules/simpletest/src/WebTestBase.php

@@ -613,10 +613,6 @@ abstract class WebTestBase extends TestBase {
       'value' => $this->originalProfile,
       'required' => TRUE,
     ];
-    $settings['settings']['apcu_ensure_unique_prefix'] = (object) [
-      'value' => FALSE,
-      'required' => TRUE,
-    ];
     $this->writeSettings($settings);
     // Allow for test-specific overrides.
     $settings_testing_file = DRUPAL_ROOT . '/' . $this->originalSite . '/settings.testing.php';

core/modules/simpletest/tests/src/Functional/BrowserTestBaseTest.php

@@ -36,6 +36,10 @@ class BrowserTestBaseTest extends BrowserTestBase {
     // Response includes cache tags that we can assert.
     $this->assertSession()->responseHeaderEquals('X-Drupal-Cache-Tags', 'rendered');
 
+    // Test that we can read the JS settings.
+    $js_settings = $this->getDrupalSettings();
+    $this->assertSame('azAZ09();.,\\\/-_{}', $js_settings['test-setting']);
+
     // Test drupalGet with a url object.
     $url = Url::fromRoute('test_page_test.render_title');
     $this->drupalGet($url);

core/modules/simpletest/tests/src/FunctionalJavascript/BrowserWithJavascriptTest.php

@@ -53,4 +53,13 @@ JS;
     $this->assertJsCondition($javascript, 100);
   }
 
+  /**
+   * Tests creating screenshots.
+   */
+  public function testCreateScreenshot() {
+    $this->drupalGet('<front>');
+    $this->createScreenshot('public://screenshot.jpg');
+    $this->assertFileExists('public://screenshot.jpg');
+  }
+
 }