/usr/share/mysql/mysql-test/t/1st.test is in mariadb-test-5.5 5.5.36-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #
# Check that we haven't any strange new tables or databases
#
show databases;
show tables in mysql;
|