/usr/lib/mysql-testsuite/t/plugin_load-master.opt is in mysql-testsuite-5.6 5.6.16-1~exp1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | $EXAMPLE_PLUGIN_OPT
$EXAMPLE_PLUGIN_LOAD
--loose-plugin-example-enum-var=e2
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