/usr/share/libwebsockets-test-server/libwebsockets-test-server.key.pem is in libwebsockets-test-server-common 2.0.3-2.
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 | -----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
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