diff --git a/classes/local/api_testable.php b/classes/local/api_testable.php
index 56f6f83..f037dd6 100644
--- a/classes/local/api_testable.php
+++ b/classes/local/api_testable.php
@@ -45,6 +45,12 @@ class api_testable extends api {
     /** @var string version api version to apply for */
     public $version = '1.9.0';
 
+    private string $username;
+    private string $password;
+    private string $timeout;
+    private string $connecttimeout;
+    private string $baseurl;
+
     /**
      * Constructor of the Opencast Test API.
      *