Capybara session reset issue

capybara_reset_spec.rb

require "rack"
require "capybara/rspec"

App = Rack::Builder.new do
  map "/" do
    run proc { |env|
      request = Rack::Request.new(env)
      response = Rack::Response.new
      if request.cookies["logged_in"]
        response.write "Logged in!"
      else
        response.write "<a href='/login'>Log In</a>"
      end
      response.finish
    }
  end

  map "/login" do
    run proc { |env|
      response = Rack::Response.new
      response.set_cookie("logged_in", true)
      response.redirect "/"
      response.finish
    }
  end
end

Capybara.app = App
Capybara.default_driver = :selenium

RSpec.configure do |config|
  config.order = "default"
end

feature "Cookie session app" do
  it "can log in" do
    visit "/"
    click_link "Log In"
    page.should have_content("Logged in!")
  end

  it "isn't logged in after a normal example" do
    visit "/"
    page.should have_no_content("Logged in!")
  end

  it "is going to leave selenium on a different host" do
    visit "/"
    click_link "Log In"
    visit "http://google.com/"
  end

  it "should not be logged when selenium was left on a different host" do
    visit "/"
    page.should have_no_content("Logged in!")
  end
end