/usr/share/php/Horde/Test/vendor/autoload.php is in php-horde-test 2.6.0+debian0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <?php
// This is a fake autoload.php, required by Horde_Test_Autoload
|