app-controllers-some_bars_controller.rb

class SomeBarsController < ApplicationController
  def index
    return "hi"
  end
end

config-routes.rb

Spree::Core::Engine.routes.append do
  resources :some_bars
end

Error

  1) SomeBarsController GET 'index' should be successful
     Failure/Error: get 'index'
     ActionController::RoutingError:
       No route matches {:controller=>"some_bars"}

  2) SomeBarsController GET 'index' should render Hello World
     Failure/Error: get 'index'
     ActionController::RoutingError:
       No route matches {:controller=>"some_bars"}

spec-controllers-some_bars_controller_spec.rb

require 'spec_helper'

describe SomeBarsController do
  describe "GET 'index'" do
    it "should be successful" do
      get 'index'
      response.should be_success
    end
    it "should render Hello World" do
      get 'index'
      response.should contain("Hello World!")
    end
  end
end