diff --git a/src/System/Integrate/Testing/TestCase.php b/src/System/Integrate/Testing/TestCase.php
index adcb8a0c..c8280419 100644
--- a/src/System/Integrate/Testing/TestCase.php
+++ b/src/System/Integrate/Testing/TestCase.php
@@ -14,8 +14,8 @@
 
 class TestCase extends BaseTestCase
 {
-    protected Application $app;
-    protected Karnel $karnel;
+    protected ?Application $app = null;
+    protected ?Karnel $karnel   = null;
     protected string $class;
 
     protected function setUp(): void
diff --git a/tests/Integrate/Testing/TestCaseTest.php b/tests/Integrate/Testing/TestCaseTest.php
new file mode 100644
index 00000000..6fc586f1
--- /dev/null
+++ b/tests/Integrate/Testing/TestCaseTest.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace System\Test\Integrate\Testing;
+
+use System\Integrate\Application;
+use System\Integrate\Http\Karnel;
+use System\Integrate\Testing\TestCase;
+
+final class TestCaseTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        require_once dirname(__DIR__) . DIRECTORY_SEPARATOR . 'Bootstrap' . DIRECTORY_SEPARATOR . 'RegisterProvidersTest.php';
+        $this->app = new Application(dirname(__DIR__) . '/assets/app2');
+        $this->app->set(Karnel::class, fn () => new Karnel($this->app));
+
+        parent::setUp();
+    }
+
+    public function testTestRunSmoothly(): void
+    {
+        $this->assertTrue(true);
+    }
+}