capybara 2.0 test for element not visible for either cucumber or rspec feature tests.

capybara-element-not-visible-spec.rb

context 'my element' do
 before do
   a =<< EOF
     jQuery ->
        $('body').append('<div id=empty_or_hidden_element></div>')
   EOF
   page.execute_script CoffeeScript.compile(a) 
 end

 it 'should not be displayed' do
   lambda { find('#empty_or_hidden_element') }.should raise_error(Capybara::ElementNotFound) 
 end
end