test-unit is a xUnit family unit testing framework for Ruby. Backward compatibility test-unit 1.2.3 is the same version as bundled in Ruby 1.8. Install: % sudo gem install test-unit -v 1.2.3 Usage: require "rubygems" gem "test-unit", "1.2.3" require "test/unit" test-unit 1.2.3 reference manual Feature split test-unit splits some packages by feature. e.g. GTK+ test runner is a different package. In