gistfile1.rb

require 'spec_helper'

describe ArticlesController, :type => :controller do
# ^^ :type => :controller is not necessary if the file is in spec/controllers
  describe "GET index" do
# ^^ The describe method creates an example group. ^^
    get :index
# ^^ The get method is exposed to an example.
    response.should be_successful
  end
end

#################
# Try this instead:

describe ArticlesController do
  describe "GET index" do
    it "returns a 200" do
      get :index
      response.should be_successful
    end
  end
end