/usr/lib/mysql-testsuite/include/start_mysqld.inc 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 4 5 6 7 8 9 10 11 12 13 | # Include this script only after using shutdown_mysqld.inc
# where $_expect_file_name was initialized.
# Write file to make mysql-test-run.pl start up the server again
--exec echo "restart" > $_expect_file_name
# Turn on reconnect
--enable_reconnect
# Call script that will poll the server waiting for it to be back online again
--source include/wait_until_connected_again.inc
# Turn off reconnect again
--disable_reconnect
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