Gemfile

group :development, :test do
  gem 'ruby-debug19', :require => 'ruby-debug'

  gem 'rspec-rails', '2.8.0'
  gem 'factory_girl_rails', '1.1.rc1'
  gem 'database_cleaner', '0.7.1'
  gem 'spork', '0.9.0'
  gem 'launchy'
  gem 'capybara'
  gem 'capybara-webkit'

  gem 'guard', '1.0.1'
  gem 'guard-bundler', '0.1.3'
  gem 'guard-rspec', '0.6.0'
  gem 'guard-spork', '0.5.2'
  gem 'growl', '1.0.3'
end

Guardfile

guard 'bundler' do
  watch('Gemfile')
end

guard 'spork', wait: 60, cucumber: false, rspec: true, test_unit: false do
  watch('config/application.rb')
  watch('config/environment.rb')
  watch(%r{^config/environments/.+\.rb$})
  watch(%r{^config/initializers/.+\.rb$})
  watch('Gemfile')
  watch('spec/spec_helper.rb')
end

guard 'rspec', version: 2, cli: '--drb --format progress --color' do
  watch(%r{^spec/.+_spec\.rb$})
  watch(%r{^spec/factories/(.+).rb$})
  watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
  watch('spec/spec_helper.rb')  { "spec" }

  # Rails example
  watch(%r{^spec/.+_spec\.rb$})
  watch(%r{^app/(.+)\.rb$})                           { |m| "spec/#{m[1]}_spec.rb" }
  watch(%r{^lib/(.+)\.rb$})                           { |m| "spec/lib/#{m[1]}_spec.rb" }
  watch(%r{^app/controllers/(.+)_(controller)\.rb$})  { |m| ["spec/routing/#{m[1]}_routing_spec.rb", "spec/#{m[2]}s/#{m[1]}_#{m[2]}_spec.rb"] }
  watch(%r{^spec/support/(.+)\.rb$})                  { "spec" }
  watch('spec/spec_helper.rb')                        { "spec" }
  watch('app/controllers/application_controller.rb')  { "spec/controllers" }
end

spec_helper.rb

require 'spork'

Spork.prefork do
  # Loading more in this block will cause your tests to run faster. However,
  # if you change any configuration or code from libraries loaded here, you'll
  # need to restart spork for it take effect.

  ENV["RAILS_ENV"] ||= 'test'
  require File.expand_path("../../config/environment", __FILE__)
  require 'rspec/rails'
  require 'capybara/rspec'

  Dir["#{Rails.root}/spec/support/**/*.rb"].each { |file| require file }

  RSpec.configure do |config|
    config.mock_with :rspec
    config.use_transactional_fixtures = false
    config.backtrace_clean_patterns = [
      /spec\/spec_helper\.rb/,
      /lib\/rspec\/(core|expectations|matchers|mocks)/
    ]
    config.before(:suite) do
      Capybara.javascript_driver = :webkit
      Capybara.default_wait_time = 5
      DatabaseCleaner.strategy = :transaction
      DatabaseCleaner.start
      Rails.cache.clear
    end

    config.after(:suite) do
      DatabaseCleaner.clean
    end
  end
end

Spork.each_run do
  load "#{Rails.root}/config/routes.rb"
  Dir["#{Rails.root}/app/**/*.rb"].each {|f| load f}
  Dir["#{Rails.root}/lib/**/*.rb"].each {|f| load f}
end