The most common way to install the RSpec gem is using Bundler. Add this line to your application's Gemfile:
gem 'rspec'
And then execute bundle to install the dependencies:
$ bundle
Alternatively, you can install the gem manually:
$ gem install rspec
After installing the gem, run the following command:
rspec --init
This will create a spec folder for your tests, along with the following config files:
spec directory into which to put spec filesspec/spec_helper.rb file with default configuration options.rspec file with default command-line flags