Running RSpec
RSpec is a Behaviour-Driven Development tool for Ruby programmers. BDD is an approach to software development that combines Test-Driven Development, Domain Driven Design, and Acceptance Test-Driven Planning. RSpec helps you do the TDD part of that equation, focusing on the documentation and design aspects of TDD. (RSpec Documentation)
When you create a new Rails app, put -T at the end of the command like this
>> rails new sample_app -T
Install rspec
>> gem install rspec-rails
Install bundle
>> bundle install
Install files needed by Rails to run rspec
>> rails generate rspec:install
To run the rspec
>> bundle exec rspec spec/