While working on jruby/jruby#6246 I found that the test_sni test in WEBrick's test_ssl.rb is failing because a verify_callback is not being called.

The assertion in question is here: https://github.com/ruby/webrick/blob/2c912ded39f2d3046203cde8b169dcf2c267017e/test/webrick/test_https.rb#L41

The callback is set just north of that line, and is intended to capture the subject. However since it never gets called, subject remains nil and the assertion fails.