Simple BDD API for testing asynchronous Ruby/EventMachine code (c) 2008 Aman Gupta (tmm1) The API is identical to Bacon, except that you must explicitly call 'done' after all the current behavior's assertions have been made: require 'em/spec' EM.describe EventMachine do should 'have timers' do start = Time.now EM.add_timer(0.5){ (Time.now-start).should.be.close 0.5, 0.1 done } end should 'have periodic timers' do num = 0 start = Time.now timer = EM.add_periodic_timer(0.5){ if (num += 1) == 2 (Time.now-start).should.be.close 1.0, 0.1 EM.__send__ :cancel_timer, timer done end } end end Resources: Git repository: http://github.com/tmm1/em-spec Bacon: http://groups.google.com/group/comp.lang.ruby/browse_thread/thread/30b07b651b0662fd Initial announcement: http://groups.google.com/group/eventmachine/browse_thread/thread/8b4e7ead72f9d013