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. And finally, JRuby trunk contains a new MBean for analysing parse times.
JRuby 1.1.3 was released with Gems 1.2, improved performance, and many other fixes. Meanwhile the library support for JRuby increases, with a JRuby version of rcov in the works, as well as ports of Rubinius' Foreign Function Interface (FFI) and its MVM API.
Like Jester, the Java program that inspired it, Heckle mutates your Ruby code, attempting to make your unit tests fail. The premise is simple: If your unit test doesn't choke on Heckle's mutated code, then you need to improve coverage.
