/usr/lib/python3/dist-packages/certbot/tests/testdata/csr-nonames_512.pem is in python3-certbot 0.23.0-1.
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 | -----BEGIN CERTIFICATE REQUEST-----
MIH/MIGqAgEAMEUxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw
HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQwXDANBgkqhkiG9w0BAQEF
AANLADBIAkEArHVztFHtH92ucFJD/N/HW9AsdRsUuHUBBBDlHwNlRd3fp580rv2+
6QWE30cWgdmJS86ObRz6lUTor4R0T+3C5QIDAQABoAAwDQYJKoZIhvcNAQELBQAD
QQBt9XLSZ9DGfWcGGaBUTCiSY7lWBegpNlCeo8pK3ydWmKpjcza+j7lF5paph2LH
lKWVQ8+xwYMscGWK0NApHGco
-----END CERTIFICATE REQUEST-----
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