gistfile1.rb

module IntegrationSpecHelper
  def login_with_oauth(service = :facebook)
    visit "/auth/#{service}"
  end
end

============================================================================

RSpec.configure do |config|
  config.include IntegrationSpecHelper, :type => :request
end

Capybara.default_host = 'http://example.org'
OmniAuth.config.test_mode = true
OmniAuth.config.add_mock(:facebook, {
  :uid => '12345',
  :nickname => 'dpsk'
})

===========================================================================

require 'spec_helper'

describe 'facebook' do
  it "should login with facebook", :js => true do
    visit "/auth/facebook"

    visit '/'
    page.should have_content("dpsk")
  end
end

===========================================================================