https://www.infoq.com/news/2008/09/jruby-rcov-ribs-parser-stats/
JRuby Roundup: RCov Port Available, Ribs For Hibernate Support, Parser Stats - InfoQ
A port of the popular code coverage tool rcov is now available for JRuby. Ola Bini started a Hibernate-based library for persisting Ruby objects named Ribs....