/usr/lib/mysql-testsuite/collections/ is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/mysql-testsuite/collections/README
/usr/lib/mysql-testsuite/collections/README.experimental
/usr/lib/mysql-testsuite/collections/default.daily
/usr/lib/mysql-testsuite/collections/default.daily-valgrind
/usr/lib/mysql-testsuite/collections/default.experimental
/usr/lib/mysql-testsuite/collections/default.push
/usr/lib/mysql-testsuite/collections/default.push-valgrind
/usr/lib/mysql-testsuite/collections/default.release
/usr/lib/mysql-testsuite/collections/default.release.done
/usr/lib/mysql-testsuite/collections/default.weekly
/usr/lib/mysql-testsuite/collections/default.weekly-valgrind
/usr/lib/mysql-testsuite/collections/default.weekly.basic
/usr/lib/mysql-testsuite/collections/disabled-daily.list
/usr/lib/mysql-testsuite/collections/disabled-gtid-on.list
/usr/lib/mysql-testsuite/collections/disabled-per-push.list
/usr/lib/mysql-testsuite/collections/disabled-weekly.list