rspec + capybara で 非RailsのWebアプリをテスト ref: http://qiita.com/yoshitsugu/items/76e62ebff2ac244020a1

Gemfile

source "https://rubygems.org"

gem "rspec"
gem "capybara-mechanize" , "1.0.1"

spec_helper.rb

# 設定
# encoding: utf-8

require 'capybara/mechanize'
require 'capybara/rspec'

# ref: http://stackoverflow.com/questions/18616683/why-do-i-get-including-capybaradsl-in-the-global-scope-is-not-recommended
RSpec.configure do |config|
  config.include Capybara::DSL, :type => :feature
end

Capybara.app = "myapp"
Capybara.default_driver = :mechanize
Capybara.app_host = 'http://myapp.com'
Capybara.run_server = false

test_spec.rb

#テストファイル本体
require File.dirname(__FILE__)+'/spec_helper'

describe 'テスト', :js => true do
  it 'トップページ' do
    visit "/"
    page.should have_content("TOP PAGE")
  end
end