there's no easy way to test that zig mirror downloaders are properly validating signatures and trusted comments. there should be an evil mirror server (either hosted, or just a binary you can run locally) that will do things like:
- modifying the tarball and/or minisig file, to ensure the signature is actually being validated
- replacing the requested version with a different version (along with the matching minisig) to ensure the trusted comment is properly checked against the requested filename
- anything else that's evil and sneaky, eg. maybe DOS attacks like sending data r e a l l y s l o w l y to try and waste clients' time. that sort of thing should probably be opt-in though