I’ve just been learning how incredibly powerful Test First Development is in Rails – being able to test for elements on the dom using assert_select is fantastico!

However I note that there’s no opposite – a deny_select if you will. Something that will test to see if a given element does NOT exist.

Here’s one I cooked up earlier:

  
def deny_select(element, message)  
  assert_select element, false, message
end  

Use it by passing in the css element id and the message if the assertion fails like this:

  
deny_select 'table.calendar', "Calendar should not be on page"  
Need to find a lawyer for your business? Get in touch with my company Lexoo and we'll find you a great one for free.