Update ArchTest.php

Author: freekmurze

tests/ArchTest.php

@@ -1,6 +1,5 @@
 <?php
 
-it('will not use debugging functions')
-    ->group('arch')
+arch('it will not use debugging functions')
     ->expect(['dd', 'dump', 'ray'])
     ->each->not->toBeUsed();