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Implemented OpenSSL::PKCS7::write_smime #634
Ideally you should submit them as a pull request against ruby/ruby, and cc me so I can get them included (I am a committer). We copy our tests -- modulo a few diffs -- directly from MRI. Once I've added your tests to MRI (trunk) I'll add them to our diffs (1.9.3).
Also comment on the bug I filed against MRI, once you have tests...so we are following process.