added server name, for creating url rules

tests/_bootstrap.php

@@ -18,5 +18,6 @@ require_once(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');
 // set correct script paths
 $_SERVER['SCRIPT_FILENAME'] = TEST_ENTRY_FILE;
 $_SERVER['SCRIPT_NAME'] = TEST_ENTRY_URL;
+$_SERVER['SERVER_NAME'] = 'localhost';
 
 Yii::setAlias('@tests', __DIR__);