diff --git a/core/testing.md b/core/testing.md
index 0ef1e716808..53cfad4775e 100644
--- a/core/testing.md
+++ b/core/testing.md
@@ -56,8 +56,7 @@ use Hautelook\AliceBundle\PhpUnit\RefreshDatabaseTrait;
 
 abstract class AbstractTest extends ApiTestCase
 {
-    private $token;
-    private $clientWithCredentials;
+    private ?string $token = null;
 
     use RefreshDatabaseTrait;