/usr/lib/mysql-testsuite/std_data/loaddata1.dat 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 3 | ,\N,NULL,,
00,0,000000,,
2003-03-03, 20030303,030303,\N
|