Session isolation in Capybara/Steak tests

sessions_controller.rb

class SessionsController < ApplicationController
  def create
    session[:created] = true
    render :text => "Session created"
  end

  def check
    if session[:created]
      render :text => "Session exists"
    else
      render :text => "Session does not exist"
    end
  end
end

sessions_spec.rb

require File.expand_path(File.dirname(__FILE__) + '/acceptance_helper')

feature "Sessions" do

  scenario "Test creating a session" do
    visit "/session/create"
    page.body.should =~ /Session created/
    visit "/session/check"
    page.body.should =~ /Session exists/
  end

  scenario "Test not creating a session" do
    visit "/session/check"
    page.body.should =~ /Session does not exist/

    # expected: /Session does not exist/
    #      got: "Session exists" (using =~)
  end

  # after :each do
  #   page.reset!
  # end
end