login_macros.rb

module LoginMacros
  
  def stub_env_for_omniauth
    request.env['devise.mapping'] = Devise.mappings[:user]
    env = { "omniauth.auth" => OmniAuth.config.mock_auth[:twitter] }
    @controller.stub!(:env).and_return(env)
  end
  
  def login_user
    before(:each) do
      request.env['devise.mapping'] = Devise.mappings[:user]
      env = { "omniauth.auth" => OmniAuth.config.mock_auth[:twitter] }
      @controller.stub!(:env).and_return(env)
        
      sign_in Factory(:user)
    end
  end
  
end

spec_helper.rb

require 'rubygems'
require 'spork'
#uncomment the following line to use spork with the debugger
#require 'spork/ext/ruby-debug'

Spork.prefork do
  ENV["RAILS_ENV"] ||= 'test'
  require File.expand_path("../../config/environment", __FILE__)
  require 'rspec/rails'
  require 'rspec/autorun'
  require 'ostruct'
  require 'database_cleaner'

  # Requires supporting ruby files with custom matchers and macros, etc,
  # in spec/support/ and its subdirectories.
  Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}

  RSpec.configure do |config|
    # ## Mock Framework
    #
    # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
    #
    # config.mock_with :mocha
    # config.mock_with :flexmock
    # config.mock_with :rr

    # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
    config.fixture_path = "#{::Rails.root}/spec/fixtures"

    # If you're not using ActiveRecord, or you'd prefer not to run each of your
    # examples within a transaction, remove the following line or assign false
    # instead of true.
    config.use_transactional_fixtures = true

    # If true, the base class of anonymous controllers will be inferred
    # automatically. This will be the default behavior in future versions of
    # rspec-rails.
    config.infer_base_class_for_anonymous_controllers = false
    
    config.before(:suite) do
      DatabaseCleaner.strategy = :truncation
    end

    config.before(:each) do
      DatabaseCleaner.start
    end

    config.after(:each) do
      DatabaseCleaner.clean
    end
    
    config.include Devise::TestHelpers, :type => :controller
    config.extend LoginMacros, :type => :controller
  end
  
  OmniAuth.config.test_mode = true
  OmniAuth.config.mock_auth[:twitter] = {
    :uid => '1337',
    :provider => 'twitter',
    :extra => {
      :raw_info => {
        :name => 'Jonnie Hallman',
        :screen_name => 'destroytoday'
      }
    }
  }
end

Spork.each_run do
  require 'simplecov'
  SimpleCov.start 'rails'
end