/usr/lib/mysql-testsuite/std_data/client-key.pem 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 4 5 6 7 8 9 10 11 12 13 14 15 | -----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
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