[ticket/11620] Rename provider -> mock_auth_provider

Rename the class and file name to better match
what the class is mocking, as well as implement the
interface of that class.

PHPBB3-11620

tests/mock/auth_provider.php

@@ -0,0 +1,53 @@
+<?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.
+ *
+ * See interface here:
+ *    includes/auth/provider/interface.php
+ */
+class phpbb_mock_auth_provider implements phpbb_auth_provider_interface
+{
+
+	function init()
+	{
+		return null;
+	}
+
+	function login($username, $password)
+	{
+		return array(
+			 'status' => "",
+			 'error_msg' => "",
+			 'user_row' => "",
+			);
+	}
+
+	function autologin()
+	{
+		return array();
+	}
+
+	function acp($new)
+	{
+		return array();
+	}
+
+	function logout($data, $new_session)
+	{
+		return null;
+	}
+
+	function validate_session($user)
+	{
+		return null;
+	}
+}