Well, we know that some upstreams are hostile to downstream testing.
However, how about they actually encrypt tests, so that only their CI can run them?
https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-python/pefile/pefile-2023.2.7.ebuild?id=ec0d293b15ba0514e9349fdbf9fed7131a72c226#n24
https://github.com/erocarrera/pefile/blob/master/tests/test_data.tar.bz2.enc
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