/usr/lib/mysql-testsuite/suite/engines/iuds/ 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/suite/engines/iuds/r/
/usr/lib/mysql-testsuite/suite/engines/iuds/r/delete_decimal.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/delete_time.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/delete_year.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/insert_calendar.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/insert_decimal.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/insert_number.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/insert_time.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/insert_year.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/strings_charsets_update_delete.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/strings_update_delete.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/type_bit_iuds.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/update_decimal.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/update_delete_calendar.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/update_delete_number.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/update_time.result
/usr/lib/mysql-testsuite/suite/engines/iuds/r/update_year.result
/usr/lib/mysql-testsuite/suite/engines/iuds/t/
/usr/lib/mysql-testsuite/suite/engines/iuds/t/delete_decimal.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/delete_time.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/delete_year.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/disabled.def
/usr/lib/mysql-testsuite/suite/engines/iuds/t/hindi.txt
/usr/lib/mysql-testsuite/suite/engines/iuds/t/insert_calendar.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/insert_decimal.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/insert_number.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/insert_time.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/insert_year.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/sample.txt
/usr/lib/mysql-testsuite/suite/engines/iuds/t/strings_charsets_update_delete.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/strings_update_delete.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/type_bit_iuds.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/update_decimal.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/update_delete_calendar.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/update_delete_number.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/update_time.test
/usr/lib/mysql-testsuite/suite/engines/iuds/t/update_year.test