/usr/lib/mysql-testsuite/std_data/ca-sha512.pem 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 14 15 16 17 18 19 20 | -----BEGIN CERTIFICATE-----
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Jx3e6g==
-----END CERTIFICATE-----
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