fix: fix failing test

Author: ace411

tests/Internal/InternalTest.php

@@ -19,7 +19,7 @@ public function procProvider(): array
       // php commandline process
       [['php -r \'echo "foo";\''], 'foo'],
       // invalid input
-      [['kat --foo'], ''],
+      [['kat --foo'], "sh: 1: kat: not found\n"],
     ];
   }