diff --git a/php-packages/testing/tests/extend.php b/php-packages/testing/tests/extend.php
index 8ece8c036..075d35db5 100644
--- a/php-packages/testing/tests/extend.php
+++ b/php-packages/testing/tests/extend.php
@@ -14,7 +14,5 @@ namespace Flarum\Testing;
 use Flarum\Extend;
 
 return [
-    
-    
-    
+    (new Extend\Settings)->serializeToForum('notARealSetting', 'not.a.real.setting')
 ];
diff --git a/php-packages/testing/tests/tests/integration/TestCaseTest.php b/php-packages/testing/tests/tests/integration/TestCaseTest.php
index 4aa709da1..374cd5db3 100644
--- a/php-packages/testing/tests/tests/integration/TestCaseTest.php
+++ b/php-packages/testing/tests/tests/integration/TestCaseTest.php
@@ -9,11 +9,29 @@
 
 namespace Flarum\Testing\Tests\integration;
 
+use Flarum\Extend;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Flarum\Testing\integration\TestCase;
+use Flarum\User\User;
 
 class TestCaseTest extends TestCase
 {
+    /**
+     * @test
+     */
+    public function admin_user_created_as_part_of_default_state()
+    {
+        $this->app();
+
+        $this->assertEquals(1, User::query()->count());
+    
+        $user = User::find(1);
+
+        $this->assertEquals('admin', $user->username);
+        $this->assertEquals('admin@machine.local', $user->email);
+        $this->assertTrue($user->isAdmin());
+    }
+
     /**
      * @test
      */
@@ -27,4 +45,46 @@ class TestCaseTest extends TestCase
         $this->assertEquals('world', $settings->get('hello'));
         $this->assertEquals('something_other_than_username', $settings->get('display_name_driver'));
     }
+
+    /**
+     * @test
+     */
+    public function current_extension_not_applied_by_default()
+    {
+        $response = $this->send(
+            $this->request('GET', '/')
+        );
+
+        $this->assertStringNotContainsString('notARealSetting', $response->getBody()->getContents());
+    }
+
+    /**
+     * @test
+     */
+    public function current_extension_applied_if_specified()
+    {
+        $this->extension('flarum-testing-tests');
+
+        $response = $this->send(
+            $this->request('GET', '/')
+        );
+
+        $this->assertStringContainsString('notARealSetting', $response->getBody()->getContents());
+    }
+
+    /**
+     * @test
+     */
+    public function can_apply_extenders()
+    {
+        $this->extend(
+            (new Extend\Settings)->serializeToForum('notARealSetting', 'not.a.real.setting')
+        );
+
+        $response = $this->send(
+            $this->request('GET', '/')
+        );
+
+        $this->assertStringContainsString('notARealSetting', $response->getBody()->getContents());
+    }
 }
\ No newline at end of file