diff --git a/tests/mock/auth_provider.php b/tests/mock/auth_provider.php
index 9d002334d62..a576ef6b67d 100644
--- a/tests/mock/auth_provider.php
+++ b/tests/mock/auth_provider.php
@@ -10,14 +10,9 @@
 /**
  * Mock auth provider class with basic functions to help test sessions.
  */
-class phpbb_mock_auth_provider implements phpbb_auth_provider_interface
+class phpbb_mock_auth_provider extends phpbb_auth_provider_base
 {
-	function init()
-	{
-		return null;
-	}
-
-	function login($username, $password)
+	public function login($username, $password)
 	{
 		return array(
 			'status' => "",
@@ -25,29 +20,4 @@ function login($username, $password)
 			'user_row' => "",
 		);
 	}
-
-	function autologin()
-	{
-		return array();
-	}
-
-	function acp()
-	{
-		return array();
-	}
-
-	function logout($data, $new_session)
-	{
-		return null;
-	}
-
-	function validate_session($user)
-	{
-		return null;
-	}
-
-	public function get_acp_template($new_config)
-	{
-		return null;
-	}
 }