Test both Ajax and Javascript-disabled version with the same test using RSpec, Capybara, and Selenium

pages_spec.rb

describe "Pages" do
  # a trivial example that follows a link from "Page A" to "Page B"
  shared_examples "an example page" do
    it "should follow link from Page A to Page B" do
      visit page_a_path
      click_link "Link to B"
      page.should have_content("Page B")
      current_path.should == page_b_path
    end
  end

  # shared examples will be run in Rack::Test driver with no Javascript
  context "javascript disabled" do
    it_behaves_like "an example page"
  end

  # shared examples will be run in Firefox (via Selenium) with full Javascript support
  context "javascript enabled", :js => true do
    it_behaves_like "an example page"
  end
end