Rails 3-Cucumber-Omniauth and issue＆hellip; :(

when /^Facebook reply$/ do
  Devise::OmniAuth.short_circuit_authorizers!
  Devise::OmniAuth.stub!(:facebook) do |b|
    b.post('/oauth/access_token') { [200, {}, ACCESS_TOKEN.to_json] }
    b.get('/me?access_token=plataformatec') { [200, {}, FACEBOOK_INFO.to_json] }
  end
  visit '/users/auth/facebook/callback'
end

Devise is not missing constant TestHelpers! (ArgumentError)
./features/step_definitions/users_connect_steps.rb:20:in `/^Facebook reply$/'
features/users_connect.feature:9:in `And Facebook reply'

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