original_welcome_controller_spec.rb

require "spec_helper"

RSpec.describe WelcomeController, :type => :controller do

  describe "GET home" do
    it "returns http success" do
      get :home
      expect(response).to be_success
    end

    it "renders the home template" do
      get :home
      expect(response).to render_template("home")
    end
  end
  
  describe "GET about" do
    it "returns http success" do
      get :about
      expect(response).to be_success
    end
  
    it "renders the about template" do
      get :about
      expect(response).to render_template("about")
    end
  end
  
  describe "GET contact" do
    it "returns http success" do
      get :contact
      expect(response).to be_success
    end

    it "renders the contact template" do
      get :contact
      expect(response).to render_template("contact")
    end
  end

end

welcome_controller_spec.rb

require "spec_helper"

RSpec.describe WelcomeController, :type => :controller do

  welcomes = %w{portfolio about contact}

  welcomes.each do |welcome|
    describe "GET #{welcome}" do
      it "returns http success" do
        get welcome.to_sym
        expect(response).to be_success
      end

      it "renders the #{welcome} template" do
        get welcome.to_sym
        expect(response).to render_template(welcome)
      end
    end
  end
end