[ticket/11620] Implemented a provider mock object.

Due to an auth_refactor, there is a new dependency
in session.php on phpbb_container and a provider.

For purposes of testing, implemented a simple one.

PHPBB3-11620

tests/mock/provider.php

@@ -0,0 +1,23 @@
+<?php
+/**
+ *
+ * @package testing
+ * @copyright (c) 2013 phpBB Group
+ * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+ *
+ */
+
+/**
+ * Mock provider class with basic functions to help test
+ * sessions.
+ */
+class phpbb_provider {
+	function autologin()
+	{
+		return array();
+	}
+	function kill()
+	{
+
+	}
+}