fix vendor location

tests/_bootstrap.php

@@ -4,7 +4,7 @@ define('YII_ENV', 'test');
 defined('YII_DEBUG') or define('YII_DEBUG', true);
 
 // Search for autoload, since performance is irrelevant and usability isn't!
-$dir = __DIR__ . '/../';
+$dir = __DIR__ . '/..';
 while (!file_exists($dir . '/vendor/autoload.php')) {
     if ($dir == dirname($dir)) {
         throw new \Exception('Failed to locate autoload.php');