Note : on Ruby 1.8.7 you must install minitest first : gem install minitest 1°/ install the code on your machine git clone git://github.com/alainravet/client-server-two-byte-calculator.git cd client-server-two-byte-calculator 2°/ launch the server : Server (Calculator) : > <open 1 console> > cd client-server-two-byte-calculator > ruby server.rb 3°/ launch the client : Automated Client with a few sample operations : > <open 1 console> > cd client-server-two-byte-calculator > ruby client.rb or : Interactive Client : > <open 1 console> > cd client-server-two-byte-calculator > telnet localhost 6666 # type commands here # ex: PLUS 1 2 3 # end with "OK CLOSE" ------ How to run the tests : > cd client-server-two-byte-calculator > rake test