how to use sessions with capybara

rspec.rb

# support/setup.rb
def in_browser(name)
  old_session = Capybara.session_name

  Capybara.session_name = name
  yield
ensure
  Capybara.session_name = old_session
end

# in a spec file
    in_browser(:guest) do
      sign_in(guest)
      # do what you want
    end

    in_browser(:admin) do
      sign_in(admin)
      # do something else
    end
# etc.