/usr/lib/mysql-testsuite/std_data/server-key.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 21 22 23 24 25 26 27 | -----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
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