[ticket/12574] Don't add extension to php config & set default username

PHPBB3-12574

tests/auth/provider_ldap_test.php

@@ -38,6 +38,7 @@ class phpbb_auth_provider_ldap_test extends phpbb_database_test_case
 		$lang_loader = new \phpbb\language\language_file_loader($phpbb_root_path, $phpEx);
 		$lang = new \phpbb\language\language($lang_loader);
 		$this->user = new \phpbb\user($lang, '\phpbb\datetime');
+		$this->user->data['username'] = 'admin';
 
 		$this->provider = new \phpbb\auth\provider\ldap($config, $db, $lang, $this->user);
 	}