gem install bundler
bundle install
bundle update

$ rspec

Sample
  #say
    Using expect to
      should say 'Hello TDD BootCamp!'
    Using subject it should
      should eq "Yeah! TDD BootCamp!"
    Using power assert
      should 
            be asserted by{ sample.say(greeting) == "Wow! TDD BootCamp!" }
                            |      |   |         |
                            |      |   |         true
                            |      |   "Wow!"
                            |      "Wow! TDD BootCamp!"
                            #<Sample:0x0000563cf08833e8>

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