discover.rb

Autotest.add_discovery { "rspec2" }

Gemfile

#excerpt
...

group :test do
  gem "rspec-rails",        :git => "git://github.com/rspec/rspec-rails.git"
  gem "rspec",              :git => "git://github.com/rspec/rspec.git"
  gem "rspec-core",         :git => "git://github.com/rspec/rspec-core.git"
  gem "rspec-expectations", :git => "git://github.com/rspec/rspec-expectations.git"
  gem "rspec-mocks",        :git => "git://github.com/rspec/rspec-mocks.git"

  gem 'autotest'
  gem 'autotest-rails-pure'
  gem 'autotest-growl'

  ...
end

spec_helper.rb

ENV["RAILS_ENV"] ||= 'test'

require 'rubygems'
require 'bundler'
Bundler.setup

require File.expand_path("../../config/environment", __FILE__)

require 'active_record'
require 'action_controller'
require 'action_mailer'
require 'rspec/rails'

Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each {|f| require f}

RSpec.configure do |config|
  config.filter_run :focus => true
  config.run_all_when_everything_filtered = true

  config.mock_with :rspec

  config.fixture_path = "#{::Rails.root}/spec/fixtures"

  config.use_transactional_fixtures = true
end