diff -u b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
--- b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
@@ -2,7 +2,9 @@
 
 namespace Drupal\FunctionalJavascript\Core\Session;
 
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
 use Drupal\Tests\BrowserTestBase;
+use Drupal\user\Entity\Role;
 use Drupal\user\Entity\User;
 
 /**
@@ -10,7 +12,7 @@
  *
  * @group session
  */
-class SessionTest extends BrowserTestBase {
+class SessionTest extends JavascriptTestBase {
 
   /**
    * {@inheritdoc}
@@ -29,12 +31,17 @@
   protected function setUp() {
     parent::setUp();
 
-    $this->user = $this->drupalCreateUser([
+    $permissions = [
       'administer site configuration',
       'access administration pages',
       'access content overview',
-    ]);
-    $this->drupalLogin($this->user);
+    ];
+    /** @var Role $role */
+    $role = Role::load('anonymous');
+    foreach ($permissions as $perm) {
+      $role->grantPermission($perm);
+    }
+    $role->save();
   }
 
   /**
@@ -49,7 +56,10 @@
     $page = $this->getSession()->getPage();
 
     for ($i = 0; $i < 15; $i++) {
+      // Before each ajax we need to prepare the request.
+      $this->prepareRequest();
       $page->clickLink('sort by Title');
+      $session_assert->assertWaitOnAjaxRequest();
       $session_assert->statusCodeEquals(200);
     }
   }
@@ -72,6 +82,7 @@
         $this->drupalGet('admin/content');
       }
       $page->clickLink('sort by Title');
+      $session_assert->assertWaitOnAjaxRequest();
       $session_assert->statusCodeEquals(200);
     }
   }