Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxThemeTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Drupal\FunctionalJavascriptTests\Ajax;
+
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+
+/**
+ * Tests that AJAX responses use the current theme.
+ *
+ * @group Ajax
+ */
+class AjaxThemeTest extends JavascriptTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['ajax_test'];
+
+  public function testAjaxWithAdminRoute() {
+    \Drupal::service('theme_installer')->install(['stable', 'seven']);
+    $theme_config = \Drupal::configFactory()->getEditable('system.theme');
+    $theme_config->set('admin', 'seven');
+    $theme_config->set('default', 'stable');
+    $theme_config->save();
+
+    $account = $this->drupalCreateUser(['view the administration theme']);
+    $this->drupalLogin($account);
+
+    // First visit the site directly via the URL. This should render it in the
+    // admin theme.
+    $this->drupalGet('admin/ajax-test/theme');
+    $assert = $this->assertSession();
+    $assert->pageTextContains('Current theme: seven');
+
+    // Now click the modal, which should also use the admin theme.
+    $this->drupalGet('ajax-test/dialog');
+    $assert->pageTextNotContains('Current theme: stable');
+    $this->clickLink('Link 8 (ajax)');
+    $assert->assertWaitOnAjaxRequest();
+
+    $assert->pageTextContains('Current theme: stable');
+    $assert->pageTextNotContains('Current theme: seven');
+  }
+
+}

core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\FunctionalJavascriptTests\Core\Session;
+
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+use Drupal\menu_link_content\Entity\MenuLinkContent;
+
+/**
+ * Tests that sessions don't expire.
+ *
+ * @group session
+ */
+class SessionTest extends JavascriptTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['menu_link_content', 'block'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $account = $this->drupalCreateUser();
+    $this->drupalLogin($account);
+
+    $menu_link_content = MenuLinkContent::create([
+      'title' => 'Link to front page',
+      'menu_name' => 'tools',
+      'link' => ['uri' => 'route:<front>'],
+    ]);
+    $menu_link_content->save();
+
+    $this->drupalPlaceBlock('system_menu_block:tools');
+  }
+
+  /**
+   * Tests that the session doesn't expire.
+   *
+   * Makes sure that drupal_valid_test_ua() works for multiple requests
+   * performed by the Mink browser. The SIMPLETEST_USER_AGENT cookie must always
+   * be valid.
+   */
+  public function testSessionExpiration() {
+    // Visit the front page and click the link back to the front page a large
+    // number of times.
+    $this->drupalGet('<front>');
+
+    $session_assert = $this->assertSession();
+
+    $page = $this->getSession()->getPage();
+
+    for ($i = 0; $i < 25; $i++) {
+      $page->clickLink('Link to front page');
+      $session_assert->statusCodeEquals(200);
+    }
+  }
+
+}

core/tests/Drupal/FunctionalJavascriptTests/JavascriptTestBase.php

@@ -38,7 +38,7 @@ abstract class JavascriptTestBase extends BrowserTestBase {
     catch (DeadClient $e) {
       $this->markTestSkipped('PhantomJS is either not installed or not running. Start it via phantomjs --ssl-protocol=any --ignore-ssl-errors=true vendor/jcalderonzumba/gastonjs/src/Client/main.js 8510 1024 768&');
     }
-    catch (Exception $e) {
+    catch (\Exception $e) {
       $this->markTestSkipped('An unexpected error occurred while starting Mink: ' . $e->getMessage());
     }
   }