This is a homework for my interview.
I used rails 5.0 + ruby-2.3.1 for my enviroment, but it doesn't mean they are hard dependencies;
to run several command line to see the test result:
bundle install
rails db:migrate (or rake if you are using rails 4.x)
rails test
--Normally now you can see the testing result printing on the screen now!
That's it, hope you like it!