Searching for empty form fields using rspec
Took me far to long to work out how to do this!
To find an empty input field we can look for
"input[type=text][value='']"
e.g.
response.body.should have_tag("input[type=text][value='']")
This is useful when filling in forms badly to make sure your bad values still remain when you return to the form to edit them.