/usr/lib/mysql-testsuite/t/mysqlbinlog-master.opt is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | --max-binlog-size=4096
--force-restart
|