diff --git a/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php b/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php
index f3c5eab8ca..602c7e158b 100644
--- a/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php
+++ b/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php
@@ -17,6 +17,7 @@
 use Drupal\Core\Session\UserSession;
 use Drupal\Core\Site\Settings;
 use Drupal\Core\StreamWrapper\StreamWrapperInterface;
+use Drupal\Tests\RequestSessionTestTrait;
 use Drupal\Tests\SessionTestTrait;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
@@ -31,6 +32,7 @@ trait FunctionalTestSetupTrait {
 
   use SessionTestTrait;
   use RefreshVariablesTrait;
+  use RequestSessionTestTrait;
 
   /**
    * The "#1" admin user.
@@ -272,6 +274,7 @@ protected function prepareRequestForGenerator($clean_urls = TRUE, $override_serv
     $server = array_merge($server, $override_server_vars);
 
     $request = Request::create($request_path, 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     // Ensure the request time is REQUEST_TIME to ensure that API calls
     // in the test use the right timestamp.
     $request->server->set('REQUEST_TIME', REQUEST_TIME);
@@ -692,6 +695,24 @@ protected function prepareEnvironment() {
     $callbacks = [];
   }
 
+  /**
+   * Prepare the session and add it to the request.
+   */
+  protected function prepareSession(ContainerInterface $container) {
+    // Disable session writing.
+    //** @var \Drupal\Core\Session\WriteSafeSessionHandlerInterface $writeSafeHandler*/
+    $writeSafeHandler = $container->get('session_handler.write_safe');
+    $writeSafeHandler->setSessionWritable(FALSE);
+
+    /** @var \Symfony\Component\HttpFoundation\Session\SessionInterface $session */
+    $session = $container->get('session');
+    $session->start();
+
+    /** @var \Symfony\Component\HttpFoundation\Request $request */
+    $request = $container->get('request_stack')->getCurrentRequest();
+    $request->setSession($session);
+  }
+
   /**
    * Returns all supported database driver installer objects.
    *
diff --git a/core/modules/block_content/tests/src/Functional/BlockContentCacheTagsTest.php b/core/modules/block_content/tests/src/Functional/BlockContentCacheTagsTest.php
index c6778cab98..147a68b5eb 100644
--- a/core/modules/block_content/tests/src/Functional/BlockContentCacheTagsTest.php
+++ b/core/modules/block_content/tests/src/Functional/BlockContentCacheTagsTest.php
@@ -83,8 +83,10 @@ public function testBlock() {
     //   https://www.drupal.org/node/2367555 is fixed and the
     //   corresponding $request->isMethodCacheable() checks are removed from
     //   Drupal\Core\Render\Renderer.
+    $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $request_stack = $this->container->get('request_stack');
-    $request_stack->push(new Request());
+    $request_stack->push($request);
     $this->container->get('renderer')->renderRoot($build);
     $request_stack->pop();
 
diff --git a/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php b/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php
index e681a4d9ad..97deab75ae 100644
--- a/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php
@@ -34,10 +34,8 @@ class CommentDefaultFormatterCacheTagsTest extends EntityKernelTestBase {
   protected function setUp() {
     parent::setUp();
 
-    $session = new Session();
-
     $request = Request::create('/');
-    $request->setSession($session);
+    $request->setSession($this->getSessionFromRequest());
 
     /** @var \Symfony\Component\HttpFoundation\RequestStack $stack */
     $stack = $this->container->get('request_stack');
diff --git a/core/modules/comment/tests/src/Kernel/CommentHostnameTest.php b/core/modules/comment/tests/src/Kernel/CommentHostnameTest.php
index cbf67985df..67c37d1c50 100644
--- a/core/modules/comment/tests/src/Kernel/CommentHostnameTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentHostnameTest.php
@@ -29,6 +29,7 @@ class CommentHostnameTest extends KernelTestBase {
   public function testGetDefaultHostname() {
     // Create a fake request to be used for testing.
     $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '203.0.113.1']);
+    $request->setSession($this->getSessionFromRequest());
     /** @var \Symfony\Component\HttpFoundation\RequestStack $stack */
     $stack = $this->container->get('request_stack');
     $stack->push($request);
diff --git a/core/modules/content_moderation/tests/src/Kernel/ViewsModerationStateSortTest.php b/core/modules/content_moderation/tests/src/Kernel/ViewsModerationStateSortTest.php
index 379e73a473..da9370d927 100644
--- a/core/modules/content_moderation/tests/src/Kernel/ViewsModerationStateSortTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/ViewsModerationStateSortTest.php
@@ -183,6 +183,7 @@ protected function assertSortResults($view_id, $column, $order, array $expected)
       'order' => 'moderation_state',
       'sort' => strtolower($order),
     ]);
+    $request->setSession($this->getSessionFromRequest());
     $view->setRequest($request);
     $view->execute();
     $this->assertIdenticalResultset($view, $expected, [$column => $column]);
diff --git a/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php b/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
index 4131cefd45..6cc86f10c5 100644
--- a/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
+++ b/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
@@ -218,6 +218,7 @@ public function testGetUntransformedTextCommand() {
     // Verify AJAX response.
     $controller = new EditorController();
     $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $response = $controller->getUntransformedText($entity, $this->fieldName, LanguageInterface::LANGCODE_DEFAULT, 'default');
     $expected = [
       [
diff --git a/core/modules/jsonapi/src/Controller/FileUpload.php b/core/modules/jsonapi/src/Controller/FileUpload.php
index eb9fd6cd44..9c35451b38 100644
--- a/core/modules/jsonapi/src/Controller/FileUpload.php
+++ b/core/modules/jsonapi/src/Controller/FileUpload.php
@@ -140,7 +140,9 @@ public function handleFileUploadForExistingResource(Request $request, ResourceTy
     $route_parameters = ['entity' => $entity->uuid()];
     $route_name = sprintf('jsonapi.%s.%s.related', $resource_type->getTypeName(), $file_field_name);
     $related_url = Url::fromRoute($route_name, $route_parameters)->toString(TRUE);
+    $session = $request->getSession();
     $request = Request::create($related_url->getGeneratedUrl(), 'GET', [], $request->cookies->all(), [], $request->server->all());
+    $request->setSession($session);
     return $this->httpKernel->handle($request, HttpKernelInterface::SUB_REQUEST);
   }
 
diff --git a/core/modules/jsonapi/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php b/core/modules/jsonapi/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
index 0d2f093f01..9e9988c598 100644
--- a/core/modules/jsonapi/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
+++ b/core/modules/jsonapi/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
@@ -752,7 +752,10 @@ protected function getNormalizer() {
   protected function generateProphecies($entity_type_id, $bundle) {
     $resource_type = $this->container->get('jsonapi.resource_type.repository')->get($entity_type_id, $bundle);
 
-    return [new Request(), $resource_type];
+    $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
+
+    return [$request, $resource_type];
   }
 
 }
diff --git a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationSession.php b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationSession.php
index 971e907aae..1c5365a0c5 100644
--- a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationSession.php
+++ b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationSession.php
@@ -4,11 +4,14 @@
 
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\PathProcessor\OutboundPathProcessorInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\Core\Render\BubbleableMetadata;
 use Drupal\Core\Url;
 use Drupal\language\LanguageNegotiationMethodBase;
 use Drupal\language\LanguageSwitcherInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\RequestStack;
 
 /**
  * Identify language from a request/session parameter.
@@ -21,7 +24,7 @@
  *   config_route_name = "language.negotiation_session"
  * )
  */
-class LanguageNegotiationSession extends LanguageNegotiationMethodBase implements OutboundPathProcessorInterface, LanguageSwitcherInterface {
+class LanguageNegotiationSession extends LanguageNegotiationMethodBase implements OutboundPathProcessorInterface, LanguageSwitcherInterface, ContainerFactoryPluginInterface {
 
   /**
    * Flag used to determine whether query rewriting is active.
@@ -44,11 +47,37 @@ class LanguageNegotiationSession extends LanguageNegotiationMethodBase implement
    */
   protected $queryValue;
 
+  /**
+   * The request stack.
+   *
+   * @var \Symfony\Component\HttpFoundation\RequestStack
+   */
+  protected $requestStack;
+
   /**
    * The language negotiation method id.
    */
   const METHOD_ID = 'language-session';
 
+  /**
+   * Constructs a LanguageNegotiationSession object.
+   *
+   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+   *   The request stack.
+   */
+  public function __construct(RequestStack $request_stack) {
+    $this->requestStack = $request_stack;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $container->get('request_stack')
+    );
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -56,8 +85,8 @@ public function getLangcode(Request $request = NULL) {
     $config = $this->config->get('language.negotiation')->get('session');
     $param = $config['parameter'];
     $langcode = $request && $request->query->get($param) ? $request->query->get($param) : NULL;
-    if (!$langcode && isset($_SESSION[$param])) {
-      $langcode = $_SESSION[$param];
+    if (!$langcode && $request && $request->getSession()->has($param)) {
+      $langcode = $request->getSession()->get($param);
     }
     return $langcode;
   }
@@ -73,7 +102,7 @@ public function persist(LanguageInterface $language) {
       $languages = $this->languageManager->getLanguages();
       if ($this->currentUser->isAuthenticated() && isset($languages[$langcode])) {
         $config = $this->config->get('language.negotiation')->get('session');
-        $_SESSION[$config['parameter']] = $langcode;
+        $this->requestStack->getCurrentRequest()->getSession()->set($config['parameter'], $langcode);
       }
     }
   }
@@ -127,7 +156,7 @@ public function getLanguageSwitchLinks(Request $request, $type, Url $url) {
     $links = [];
     $config = $this->config->get('language.negotiation')->get('session');
     $param = $config['parameter'];
-    $language_query = isset($_SESSION[$param]) ? $_SESSION[$param] : $this->languageManager->getCurrentLanguage($type)->getId();
+    $language_query = $request->getSession()->has($param) ? $request->getSession()->get($param) : $this->languageManager->getCurrentLanguage($type)->getId();
     $query = [];
     parse_str($request->getQueryString(), $query);
 
diff --git a/core/modules/language/tests/src/Functional/LanguageNegotiationContentEntityTest.php b/core/modules/language/tests/src/Functional/LanguageNegotiationContentEntityTest.php
index 66ea59ac1e..b96141c0d2 100644
--- a/core/modules/language/tests/src/Functional/LanguageNegotiationContentEntityTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageNegotiationContentEntityTest.php
@@ -174,6 +174,7 @@ protected function createTranslatableEntity() {
    */
   protected function setCurrentRequestForRoute($path, $route_name) {
     $request = Request::create($path);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, $route_name);
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route($path));
     $this->container->get('request_stack')->push($request);
diff --git a/core/modules/language/tests/src/Functional/LanguageUILanguageNegotiationTest.php b/core/modules/language/tests/src/Functional/LanguageUILanguageNegotiationTest.php
index 239a561427..85308a27b9 100644
--- a/core/modules/language/tests/src/Functional/LanguageUILanguageNegotiationTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageUILanguageNegotiationTest.php
@@ -528,6 +528,7 @@ public function testLanguageDomain() {
 
     // Test HTTPS via current URL scheme.
     $request = Request::create('', 'GET', [], [], [], ['HTTPS' => 'on']);
+    $request->setSession($this->getSessionFromRequest());
     $this->container->get('request_stack')->push($request);
     $italian_url = Url::fromRoute('system.admin', [], ['language' => $languages['it']])->toString();
     $correct_link = 'https://' . $link;
diff --git a/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php b/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
index 802d1a2431..95cfbca012 100644
--- a/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
@@ -128,6 +128,7 @@ protected function createTranslatableEntity() {
    */
   protected function setCurrentRequestForRoute($path, $route_name) {
     $request = Request::create($path);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, $route_name);
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route($path));
     $this->container->get('request_stack')->push($request);
diff --git a/core/modules/media_library/tests/src/Kernel/MediaLibraryStateTest.php b/core/modules/media_library/tests/src/Kernel/MediaLibraryStateTest.php
index ab0bdcce20..dabc994667 100644
--- a/core/modules/media_library/tests/src/Kernel/MediaLibraryStateTest.php
+++ b/core/modules/media_library/tests/src/Kernel/MediaLibraryStateTest.php
@@ -279,7 +279,9 @@ public function testFromRequest(array $query_overrides, $exception_expected) {
       $this->expectException(BadRequestHttpException::class);
       $this->expectExceptionMessage("Invalid media library parameters specified.");
     }
-    $state = MediaLibraryState::fromRequest(new Request($query));
+    $request = new Request($query);
+    $request->setSession($this->getSessionFromRequest());
+    $state = MediaLibraryState::fromRequest($request);
     $this->assertInstanceOf(MediaLibraryState::class, $state);
   }
 
@@ -289,7 +291,9 @@ public function testFromRequest(array $query_overrides, $exception_expected) {
   public function testFromRequestQueryLess() {
     $this->expectException(\InvalidArgumentException::class);
     $this->expectExceptionMessage('The opener ID parameter is required and must be a string.');
-    $state = MediaLibraryState::fromRequest(new Request());
+    $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
+    $state = MediaLibraryState::fromRequest($request);
     $this->assertInstanceOf(MediaLibraryState::class, $state);
   }
 
diff --git a/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php b/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
index c783d852df..2a67010f31 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
@@ -54,6 +54,7 @@ public function testOutboundPathAndRouteProcessing() {
     $request_context = \Drupal::service('router.request_context');
 
     $request = Request::create('/');
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, '<front>');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/'));
     $request_stack->push($request);
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/NodeTranslationRedirectTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/NodeTranslationRedirectTest.php
index 35976ee246..dcc24f8d20 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/NodeTranslationRedirectTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/NodeTranslationRedirectTest.php
@@ -58,6 +58,7 @@ protected function setUp() {
   public function testNodeTranslationRedirect() {
     $kernel = $this->container->get('http_kernel');
     $request = Request::create('/node/11');
+    $request->getSession($this->getSessionFromRequest());
     $response = $kernel->handle($request);
     $this->assertSame(301, $response->getStatusCode());
     $this->assertSame('/node/10', $response->getTargetUrl());
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d7/NodeTranslationRedirectTest.php b/core/modules/node/tests/src/Kernel/Migrate/d7/NodeTranslationRedirectTest.php
index 7b54d5b169..4cf0c57b60 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d7/NodeTranslationRedirectTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d7/NodeTranslationRedirectTest.php
@@ -58,6 +58,7 @@ protected function setUp() {
   public function testNodeTranslationRedirect() {
     $kernel = $this->container->get('http_kernel');
     $request = Request::create('/node/3');
+    $request->setSession($this->getSessionFromRequest());
     $response = $kernel->handle($request);
     $this->assertSame(301, $response->getStatusCode());
     $this->assertSame('/node/2', $response->getTargetUrl());
diff --git a/core/modules/rest/tests/src/Functional/Views/StyleSerializerTest.php b/core/modules/rest/tests/src/Functional/Views/StyleSerializerTest.php
index 094d8797a6..173dc39035 100644
--- a/core/modules/rest/tests/src/Functional/Views/StyleSerializerTest.php
+++ b/core/modules/rest/tests/src/Functional/Views/StyleSerializerTest.php
@@ -572,6 +572,7 @@ public function testFieldRawOutput() {
   public function testLivePreview() {
     // We set up a request so it looks like an request in the live preview.
     $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->add([MainContentViewSubscriber::WRAPPER_FORMAT => 'drupal_ajax']);
     /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */
     $request_stack = \Drupal::service('request_stack');
diff --git a/core/modules/syslog/tests/src/Kernel/SyslogTest.php b/core/modules/syslog/tests/src/Kernel/SyslogTest.php
index 3b2a587a40..170bac21b9 100644
--- a/core/modules/syslog/tests/src/Kernel/SyslogTest.php
+++ b/core/modules/syslog/tests/src/Kernel/SyslogTest.php
@@ -29,6 +29,7 @@ protected function setUp() {
   public function testSyslogWriting() {
 
     $request = Request::create('/page-not-found', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+    $request->setSession($this->getSessionFromRequest());
     $request->headers->set('Referer', 'other-site');
     \Drupal::requestStack()->push($request);
 
diff --git a/core/modules/system/tests/src/Functional/Database/SelectPagerDefaultTest.php b/core/modules/system/tests/src/Functional/Database/SelectPagerDefaultTest.php
index a38a5f0180..a6f8e4c4a3 100644
--- a/core/modules/system/tests/src/Functional/Database/SelectPagerDefaultTest.php
+++ b/core/modules/system/tests/src/Functional/Database/SelectPagerDefaultTest.php
@@ -136,6 +136,7 @@ public function testHavingPagerQuery() {
   public function testElementNumbers() {
 
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'page' => '3, 2, 1, 0',
     ]);
diff --git a/core/modules/system/tests/src/Functional/Theme/ThemeTest.php b/core/modules/system/tests/src/Functional/Theme/ThemeTest.php
index fe4471a2fa..810d130bb1 100644
--- a/core/modules/system/tests/src/Functional/Theme/ThemeTest.php
+++ b/core/modules/system/tests/src/Functional/Theme/ThemeTest.php
@@ -75,6 +75,7 @@ public function testFrontPageThemeSuggestion() {
     // Set the current route to user.login because theme_get_suggestions() will
     // query it to see if we are on the front page.
     $request = Request::create('/user/login');
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'user.login');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/user/login'));
     \Drupal::requestStack()->push($request);
diff --git a/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php b/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
index 8d0ef50df2..5704ac8276 100644
--- a/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
+++ b/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
@@ -234,6 +234,7 @@ public function testConfigLevelDepth() {
     // Scenario 2: test all block instances when there's an active trail.
     $route = $this->container->get('router.route_provider')->getRouteByName('example3');
     $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'example3');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, $route);
     $this->container->get('request_stack')->push($request);
@@ -301,6 +302,7 @@ public function testConfigExpanded($active_route, $menu_block_level, $expected_i
 
     $route = $this->container->get('router.route_provider')->getRouteByName($active_route);
     $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, $active_route);
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, $route);
     $this->container->get('request_stack')->push($request);
diff --git a/core/modules/views/src/Tests/AssertViewsCacheTagsTrait.php b/core/modules/views/src/Tests/AssertViewsCacheTagsTrait.php
index 26c1ffe0b5..b57e33de73 100644
--- a/core/modules/views/src/Tests/AssertViewsCacheTagsTrait.php
+++ b/core/modules/views/src/Tests/AssertViewsCacheTagsTrait.php
@@ -45,6 +45,7 @@ protected function assertViewsCacheTags(ViewExecutable $view, $expected_results_
     /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */
     $request_stack = \Drupal::service('request_stack');
     $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $request->server->set('REQUEST_TIME', REQUEST_TIME);
     $view->setRequest($request);
     $request_stack->push($request);
@@ -128,6 +129,7 @@ protected function assertViewsCacheTagsFromStaticRenderArray(ViewExecutable $vie
     /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */
     $request_stack = \Drupal::service('request_stack');
     $request = new Request();
+    $request->setSession($this->getSessionFromRequest());
     $request->server->set('REQUEST_TIME', REQUEST_TIME);
     $request_stack->push($request);
     $renderer->renderRoot($build);
diff --git a/core/modules/views/tests/src/Kernel/Handler/AreaDisplayLinkTest.php b/core/modules/views/tests/src/Kernel/Handler/AreaDisplayLinkTest.php
index e409a2be0f..4b4fec2e2a 100644
--- a/core/modules/views/tests/src/Kernel/Handler/AreaDisplayLinkTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/AreaDisplayLinkTest.php
@@ -149,7 +149,7 @@ public function testAreaDisplayLink() {
     // Assert some special request parameters are filtered from the display
     // links.
     $request_stack = new RequestStack();
-    $request_stack->push(Request::create('page_1', 'GET', [
+    $request = Request::create('page_1', 'GET', [
       'name' => 'John',
       'sort_by' => 'created',
       'sort_order' => 'ASC',
@@ -166,7 +166,9 @@ public function testAreaDisplayLink() {
       AjaxResponseSubscriber::AJAX_REQUEST_PARAMETER => 1,
       FormBuilderInterface::AJAX_FORM_REQUEST => 1,
       MainContentViewSubscriber::WRAPPER_FORMAT => 1,
-    ]));
+    ]);
+    $request->setSession($this->getSessionFromRequest());
+    $request_stack->push($request);
     $this->container->set('request_stack', $request_stack);
     $view->destroy();
     $view->setDisplay('page_1');
diff --git a/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php b/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php
index 07dff07dfd..e3fb5ce385 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php
@@ -58,6 +58,7 @@ public function testPageResponses() {
     $this->assertEqual($response->getStatusCode(), 200);
 
     $subrequest = Request::create('/test_page_display_200', 'GET');
+    $subrequest->setSession($this->getSessionFromRequest());
     \Drupal::getContainer()->get('request_stack')->push($subrequest);
 
     // Test accessing a disabled page for a view.
diff --git a/core/modules/views_ui/src/ViewUI.php b/core/modules/views_ui/src/ViewUI.php
index 28c32f72e8..aba279dd27 100644
--- a/core/modules/views_ui/src/ViewUI.php
+++ b/core/modules/views_ui/src/ViewUI.php
@@ -581,6 +581,7 @@ public function renderPreview($display_id, $args = []) {
       $raw_parameters->set('view', $this->id());
       $raw_parameters->set('display_id', $display_id);
       $request->attributes->set('_raw_variables', $raw_parameters);
+      $request->setSession($current_request->getSession());
 
       foreach ($args as $key => $arg) {
         $request->attributes->set('arg_' . $key, $arg);
diff --git a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
index b8247ea88f..a580157043 100644
--- a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
+++ b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
@@ -743,6 +743,25 @@ public function testEscapingAssertions() {
     $assert->assertNoEscaped("<script>alert('Marked safe');alert(\"Marked safe\");</script>");
   }
 
+  /**
+   * Tests that a usable session is on the request in test-runner.
+   */
+  public function testSessionOnRequest() {
+    /** @var \Symfony\Component\HttpFoundation\Request $request */
+    $request = $this->container->get('request_stack')->getCurrentRequest();
+
+    // Verify that a usable session is available from the request.
+    /** @var \Symfony\Component\HttpFoundation\Session\SessionInterface $session */
+    $session = $request->getSession();
+    $this->assertNotNull($session);
+
+    $session->set('some-val', 'do-not-cleanup');
+    $this->assertEqual('do-not-cleanup', $session->get('some-val'));
+
+    $session->set('some-other-val', 'do-cleanup');
+    $this->assertEqual('do-cleanup', $session->remove('some-other-val'));
+  }
+
   /**
    * Tests that deprecation headers do not get duplicated.
    *
diff --git a/core/tests/Drupal/KernelTests/Core/Database/ReplicaKillSwitchTest.php b/core/tests/Drupal/KernelTests/Core/Database/ReplicaKillSwitchTest.php
index b2cdf72407..f9fb3d59e0 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/ReplicaKillSwitchTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/ReplicaKillSwitchTest.php
@@ -6,7 +6,6 @@
 use Drupal\Core\DrupalKernel;
 use Drupal\Core\Site\Settings;
 use Drupal\KernelTests\KernelTestBase;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 
@@ -32,7 +31,7 @@ public function testSystemInitIgnoresSecondaries() {
     $service->trigger();
     $class_loader = require $this->root . '/autoload.php';
     $kernel = new DrupalKernel('testing', $class_loader, FALSE);
-    $event = new GetResponseEvent($kernel, Request::create('http://example.com'), HttpKernelInterface::MASTER_REQUEST);
+    $event = new GetResponseEvent($kernel, \Drupal::request(), HttpKernelInterface::MASTER_REQUEST);
     $service->checkReplicaServer($event);
 
     $db1 = Database::getConnection('default', 'default');
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
index 43fb9c76a8..74395d6e55 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
@@ -417,6 +417,7 @@ public function testSort() {
     // Test the pager by setting element #1 to page 2 with a page size of 4.
     // Results will be #8-12 from above.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'page' => '0,2',
     ]);
@@ -450,6 +451,7 @@ public function testTableSort() {
     // assert that all entities from one bundle are after the other as the
     // order dictates.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'sort' => 'asc',
       'order' => 'Type',
diff --git a/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php b/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
index d5ad4e8915..ba72e26ece 100644
--- a/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
@@ -102,6 +102,7 @@ public function testRelativeFileURL() {
 
     // Create a mock Request for file_url_transform_relative().
     $request = Request::create($GLOBALS['base_url']);
+    $request->setSession($this->getSessionFromRequest());
     $this->container->get('request_stack')->push($request);
     \Drupal::setContainer($this->container);
 
diff --git a/core/tests/Drupal/KernelTests/Core/File/UrlTransformRelativeTest.php b/core/tests/Drupal/KernelTests/Core/File/UrlTransformRelativeTest.php
index 6614b2d5b4..75f09dc36b 100644
--- a/core/tests/Drupal/KernelTests/Core/File/UrlTransformRelativeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/UrlTransformRelativeTest.php
@@ -35,6 +35,7 @@ public function testFileUrlTransformRelative($host, $port, $https, $url, $expect
     $_SERVER['HTTPS'] = $https;
 
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     \Drupal::requestStack()->push($request);
 
     $this->assertSame($expected, file_url_transform_relative($url));
diff --git a/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php b/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php
index f3fbc4f76c..9b345b834a 100644
--- a/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php
@@ -77,6 +77,7 @@ public function testActionUrlBehavior() {
     $request_stack->pop();
     $request_stack->pop();
     $request = Request::create($original_request->getSchemeAndHttpHost() . '//example.org');
+    $request->setSession($this->getSessionFromRequest());
     $request_stack->push($request);
 
     $form = \Drupal::formBuilder()->getForm($this);
@@ -92,6 +93,7 @@ public function testActionUrlBehavior() {
     $request_stack = \Drupal::service('request_stack');
     $original_request = $request_stack->pop();
     $request = Request::create($original_request->getSchemeAndHttpHost() . '/example.org');
+    $request->setSession($this->getSessionFromRequest());
     $request_stack->push($request);
 
     $form = \Drupal::formBuilder()->getForm($this);
diff --git a/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php b/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php
index 169793a459..4d05b41e29 100644
--- a/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Pager/PagerManagerTest.php
@@ -45,6 +45,7 @@ public function testGetUpdatedParameters() {
       'other' => 'arbitrary',
     ];
     $request = Request::create('http://example.com', 'GET', $test_parameters);
+    $request->setSession($this->getSessionFromRequest());
 
     /* @var $request_stack \Symfony\Component\HttpFoundation\RequestStack */
     $request_stack = $this->container->get('request_stack');
diff --git a/core/tests/Drupal/KernelTests/Core/Pager/RequestPagerTest.php b/core/tests/Drupal/KernelTests/Core/Pager/RequestPagerTest.php
index bb1bc9066b..3040cf6c73 100644
--- a/core/tests/Drupal/KernelTests/Core/Pager/RequestPagerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Pager/RequestPagerTest.php
@@ -17,6 +17,7 @@ class RequestPagerTest extends KernelTestBase {
    */
   public function testFindPage() {
     $request = Request::create('http://example.com', 'GET', ['page' => '0,10']);
+    $request->setSession($this->getSessionFromRequest());
 
     /* @var $request_stack \Symfony\Component\HttpFoundation\RequestStack */
     $request_stack = $this->container->get('request_stack');
@@ -35,6 +36,7 @@ public function testGetQueryParameters() {
       'other' => 'arbitrary',
     ];
     $request = Request::create('http://example.com', 'GET', array_merge(['page' => '0,10'], $test_parameters));
+    $request->setSession($this->getSessionFromRequest());
 
     /* @var $request_stack \Symfony\Component\HttpFoundation\RequestStack */
     $request_stack = $this->container->get('request_stack');
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php
index 12569a6ca7..73daac3ebf 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php
@@ -84,6 +84,7 @@ public function testConditions() {
     $pages = "/my/pass/page\r\n/my/pass/page2\r\n/foo";
 
     $request = Request::create('/my/pass/page2');
+    $request->setSession($this->getSessionFromRequest());
     $this->requestStack->push($request);
 
     /* @var \Drupal\system\Plugin\Condition\RequestPath $condition */
diff --git a/core/tests/Drupal/KernelTests/Core/Render/Element/TableSortExtenderTest.php b/core/tests/Drupal/KernelTests/Core/Render/Element/TableSortExtenderTest.php
index 2a7ea0410c..c2317445b3 100644
--- a/core/tests/Drupal/KernelTests/Core/Render/Element/TableSortExtenderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Render/Element/TableSortExtenderTest.php
@@ -31,6 +31,7 @@ public function testTableSortInit() {
       'query' => [],
     ];
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([]);
     \Drupal::getContainer()->get('request_stack')->push($request);
     $ts = TableSort::getContextFromRequest($headers, $request);
@@ -40,6 +41,7 @@ public function testTableSortInit() {
     // Test with simple table headers plus $_GET parameters that should _not_
     // override the default.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       // This should not override the table order because only complex
       // headers are overridable.
@@ -53,6 +55,7 @@ public function testTableSortInit() {
     // Test with simple table headers plus $_GET parameters that _should_
     // override the default.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'sort' => 'DESC',
       // Add an unrelated parameter to ensure that tablesort will include
@@ -84,6 +87,7 @@ public function testTableSortInit() {
     ];
     // Reset $_GET from previous assertion.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '2',
     ]);
@@ -101,6 +105,7 @@ public function testTableSortInit() {
     // Test complex table headers plus $_GET parameters that should _not_
     // override the default.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       // This should not override the table order because this header does not
       // exist.
@@ -120,6 +125,7 @@ public function testTableSortInit() {
     // Test complex table headers plus $_GET parameters that _should_
     // override the default.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '1',
       'sort' => 'ASC',
@@ -169,6 +175,7 @@ public function testTableSortInit() {
       ],
     ];
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '1',
     ]);
@@ -187,6 +194,7 @@ public function testTableSortInit() {
     // Test that if the initial_click_sort parameter is not defined, the default
     // must be used instead (which is "asc").
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '2',
     ]);
@@ -204,6 +212,7 @@ public function testTableSortInit() {
     // Test that if the initial_click_sort parameter is defined, and the sort
     // parameter is defined as well, the sort parameter has precedence.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '3',
     ]);
@@ -221,6 +230,7 @@ public function testTableSortInit() {
     // Test that if the initial_click_sort parameter is defined and the value
     // is "asc" it should be sorted correctly.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '4',
     ]);
@@ -238,6 +248,7 @@ public function testTableSortInit() {
     // Tests that if the initial_click_sort is defined with a non expected value
     // that value will be passed as the "sort" value.
     $request = Request::createFromGlobals();
+    $request->setSession($this->getSessionFromRequest());
     $request->query->replace([
       'order' => '5',
     ]);
diff --git a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php
index 6d26891fdb..e832c24ca2 100644
--- a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php
+++ b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php
@@ -57,6 +57,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/subdir', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, '<front>');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/'));
 
@@ -74,6 +75,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/subdir/node/add', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'node.add');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/node/add'));
 
@@ -91,6 +93,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, '<front>');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/'));
 
@@ -108,6 +111,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/node/add', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'node.add');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/node/add'));
 
diff --git a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php
index 4e42271aa5..6af106e1a4 100644
--- a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php
@@ -58,6 +58,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/subdir/', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, '<front>');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/'));
 
@@ -73,6 +74,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/subdir/node/add', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'node.add');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/node/add'));
 
@@ -88,6 +90,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, '<front>');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/'));
 
@@ -103,6 +106,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/node/add', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
     $request->attributes->set(RouteObjectInterface::ROUTE_NAME, 'node.add');
     $request->attributes->set(RouteObjectInterface::ROUTE_OBJECT, new Route('/node/add'));
 
@@ -119,6 +123,7 @@ public function testProcessOutbound() {
       'SERVER_NAME' => 'http://www.example.com',
     ];
     $request = Request::create('/invalid-path', 'GET', [], [], [], $server);
+    $request->setSession($this->getSessionFromRequest());
 
     $request_stack->push($request);
     $request_context->fromRequest($request);
diff --git a/core/tests/Drupal/KernelTests/Core/Session/MockSessionManager.php b/core/tests/Drupal/KernelTests/Core/Session/MockSessionManager.php
new file mode 100644
index 0000000000..97204c99bf
--- /dev/null
+++ b/core/tests/Drupal/KernelTests/Core/Session/MockSessionManager.php
@@ -0,0 +1,139 @@
+<?php
+
+namespace Drupal\KernelTests\Core\Session;
+
+use Drupal\Core\Session\MetadataBag;
+use Drupal\Core\Session\SessionManagerInterface;
+use Drupal\Core\Session\WriteSafeSessionHandlerInterface;
+use Symfony\Component\HttpFoundation\Session\SessionBagInterface;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
+use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
+
+/**
+ * In memory implementation of SessionManager for kernel tests.
+ */
+class MockSessionManager implements SessionStorageInterface, SessionManagerInterface {
+
+  /**
+   * Underlying in memory session storage implementation.
+   *
+   * @var \Drupal\Core\Session\SessionManagerInterface
+   */
+  private $storage;
+
+  /**
+   * Constructs a new in memory session manager instance.
+   *
+   * @param \Drupal\Core\Session\MetadataBag $metadata_bag
+   *   The session metadata bag.
+   */
+  public function __construct(MetadataBag $metadata_bag) {
+    $this->storage = new MockArraySessionStorage('MOCKSESSID', $metadata_bag);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function start() {
+    return $this->storage->start();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isStarted() {
+    return $this->storage->isStarted();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getId() {
+    return $this->storage->getId();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setId($id) {
+    return $this->storage->setId($id);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return $this->storage->getName();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setName($name) {
+    $this->storage->setName($name);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function regenerate($destroy = FALSE, $lifetime = NULL) {
+    $this->storage->regenerate($destroy, $lifetime);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save() {
+    $this->storage->save();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function clear() {
+    $this->storage->clear();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getBag($name) {
+    return $this->storage->getBag($name);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function registerBag(SessionBagInterface $bag) {
+    $this->storage->registerBag($bag);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMetadataBag() {
+    return $this->storage->getMetadataBag();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function delete($uid) {
+    // Ignored.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function destroy() {
+    @trigger_error(__METHOD__ . ' not implemented in MockSessionManager', E_USER_ERROR);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setWriteSafeHandler(WriteSafeSessionHandlerInterface $handler) {
+    @trigger_error(__METHOD__ . ' not implemented in MockSessionManager', E_USER_ERROR);
+  }
+
+}
diff --git a/core/tests/Drupal/KernelTests/Core/TempStore/AnonymousPrivateTempStoreTest.php b/core/tests/Drupal/KernelTests/Core/TempStore/AnonymousPrivateTempStoreTest.php
index f5000fb234..892e03c8cd 100644
--- a/core/tests/Drupal/KernelTests/Core/TempStore/AnonymousPrivateTempStoreTest.php
+++ b/core/tests/Drupal/KernelTests/Core/TempStore/AnonymousPrivateTempStoreTest.php
@@ -37,6 +37,7 @@ protected function setUp() {
     $this->installSchema('system', ['key_value_expire']);
 
     $request = Request::create('/');
+    $request->setSession($this->getSessionFromRequest());
     $stack = $this->container->get('request_stack');
     $stack->pop();
     $stack->push($request);
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php
index 72cecce229..2ccf1f2e7e 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php
@@ -33,6 +33,7 @@ protected function setUp() {
     // the Request containing the correct hostname. KernelTestBase doesn't set
     // it, so push another request onto the stack to ensure it's correct.
     $request = Request::create('/', 'GET', [], [], [], $_SERVER);
+    $request->setSession($this->getSessionFromRequest());
     $this->container = \Drupal::service('kernel')->getContainer();
     $this->container->get('request_stack')->push($request);
 
diff --git a/core/tests/Drupal/KernelTests/KernelTestBase.php b/core/tests/Drupal/KernelTests/KernelTestBase.php
index a9999936a0..c670bb9448 100644
--- a/core/tests/Drupal/KernelTests/KernelTestBase.php
+++ b/core/tests/Drupal/KernelTests/KernelTestBase.php
@@ -21,6 +21,7 @@
 use Drupal\Tests\ConfigTestTrait;
 use Drupal\Tests\PhpunitCompatibilityTrait;
 use Drupal\Tests\RandomGeneratorTrait;
+use Drupal\Tests\RequestSessionTestTrait;
 use Drupal\Tests\TestRequirementsTrait;
 use Drupal\TestTools\Comparator\MarkupInterfaceComparator;
 use PHPUnit\Framework\Exception;
@@ -82,6 +83,7 @@ abstract class KernelTestBase extends TestCase implements ServiceProviderInterfa
   use ConfigTestTrait;
   use TestRequirementsTrait;
   use PhpunitCompatibilityTrait;
+  use RequestSessionTestTrait;
 
   /**
    * {@inheritdoc}
@@ -360,6 +362,12 @@ private function bootKernel() {
 
     $this->container = $kernel->getContainer();
 
+    // Prepare session and add it to the request.
+    /** @var \Symfony\Component\HttpFoundation\Session\SessionInterface $session */
+    $session = $this->container->get('session');
+    $session->start();
+    $request->setSession($session);
+
     // Ensure database tasks have been run.
     require_once __DIR__ . '/../../../includes/install.inc';
     $connection = Database::getConnection();
@@ -535,6 +543,11 @@ public function register(ContainerBuilder $container) {
       ->addTag('persist');
     $container
       ->setAlias('keyvalue', 'keyvalue.memory');
+    $container
+      ->register('session_manager.memory', 'Drupal\KernelTests\Core\Session\MockSessionManager')
+      ->addArgument(new Reference('session_manager.metadata_bag'));
+    $container
+      ->setAlias('session_manager', 'session_manager.memory');
 
     // Set the default language on the minimal container.
     $container->setParameter('language.default_values', Language::$defaultValues);
diff --git a/core/tests/Drupal/KernelTests/KernelTestBaseTest.php b/core/tests/Drupal/KernelTests/KernelTestBaseTest.php
index 426fa8bb27..61addd66a3 100644
--- a/core/tests/Drupal/KernelTests/KernelTestBaseTest.php
+++ b/core/tests/Drupal/KernelTests/KernelTestBaseTest.php
@@ -142,6 +142,19 @@ public function testRegister() {
     // Ensure getting the router.route_provider does not trigger a deprecation
     // message that errors.
     $this->container->get('router.route_provider');
+
+    // Verify that a usable session is available from the request.
+    /** @var \Symfony\Component\HttpFoundation\Session\SessionInterface $session */
+    $session = $request->getSession();
+
+    $this->assertNotNull($session);
+    $this->assertTrue($session->isStarted());
+
+    $session->set('some-val', 'do-not-cleanup');
+    $this->assertEqual('do-not-cleanup', $session->get('some-val'));
+
+    $session->set('some-other-val', 'do-cleanup');
+    $this->assertEqual('do-cleanup', $session->remove('some-other-val'));
   }
 
   /**
diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index 4845bf86bd..82ba4ce74c 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -455,6 +455,15 @@ protected function cleanupEnvironment() {
     \Drupal::service('file_system')->deleteRecursive($this->siteDirectory, [$this, 'filePreDeleteCallback']);
   }
 
+  /**
+   * Clear and stop a session triggered during test run.
+   */
+  protected function cleanupSession() {
+    $session = $this->getSessionFromRequest();
+    $session->clear();
+    $session->save();
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -463,6 +472,7 @@ protected function tearDown() {
 
     // Destroy the testing kernel.
     if (isset($this->kernel)) {
+      $this->cleanupSession();
       $this->cleanupEnvironment();
       $this->kernel->shutdown();
     }
@@ -569,6 +579,7 @@ public function installDrupal() {
     $this->doInstall();
     $this->initSettings();
     $container = $this->initKernel(\Drupal::request());
+    $this->prepareSession($container);
     $this->initConfig($container);
     $this->installDefaultThemeFromClassProperty($container);
     $this->installModulesFromClassProperty($container);
diff --git a/core/tests/Drupal/Tests/RequestSessionTestTrait.php b/core/tests/Drupal/Tests/RequestSessionTestTrait.php
new file mode 100644
index 0000000000..e3579c5195
--- /dev/null
+++ b/core/tests/Drupal/Tests/RequestSessionTestTrait.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Drupal\Tests;
+
+/**
+ * Provides methods to work with the session in the test runner.
+ */
+trait RequestSessionTestTrait {
+
+  /**
+   * Returns the session from the request retrieved from the request stack.
+   *
+   * @return \Symfony\Component\HttpFoundation\Session\Session
+   */
+  protected function getSessionFromRequest() {
+
+    /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */
+    $request_stack = $this->container->get('request_stack');
+    $request = $request_stack->getCurrentRequest();
+
+    if ($request && $request->hasSession()) {
+      $session = $request->getSession();
+    }
+    else {
+      /** @var \Symfony\Component\HttpFoundation\Session\Session $session */
+      $session = $this->container->get('session');
+      @trigger_error('Failed to retrieve session from current request, request stack was modified during test.', E_USER_ERROR);
+    }
+
+    return $session;
+  }
+
+}