title: How to Test a Concern in Rails
body: <p>Given that I have a <code>Personable</code> concern in my Rails 4 application which has a <code>full_name</code> method, how would I go about testing this using RSpec?</p>
  
  <p><strong>concerns/personable.rb</strong></p>
  
  <pre><code>module Personable
    extend ActiveSupport::Concern
  
    def full_name
      "#{first_name} #{last_name}"
    end
  end
  </code></pre>