Bug Hunting

So I'm banging my head against an odd error in an RSpec test. In case you missed the last post:

 1) Posts when the user has authenticated when there are posts can be deleted from link on posts page

     Failure/Error: click_link 'Destroy'

     Capybara::ElementNotFound:

       Unable to find link "Destroy"

     # ./posts_spec.rb:71:in `block (5 levels) in <top (required)>'

     # ./posts_spec.rb:69:in `block (4 levels) in <top (required)>'

I tried modifying the way the Capybara test selects the 'Destroy' link.  Instead of:

         within 'tr:last-child' do

            page.driver.accept_js_confirms!

            click_link 'Destroy'

         end

I tried:

    within 'tr:last' do

            page.driver.accept_js_confirms!

            click_link 'Destroy'

         end

That delivered a new kind of error:

     Failure/Error: within 'tr:last' do

     Capybara::Webkit::InvalidResponseError:

       SYNTAX_ERR: DOM Exception 12

     # ./posts_spec.rb:69:in `block (4 levels) in <top (required)>'

So, that didn't work. There are two other places in the spec where the tutorial I'm using said to use "tr:last" instead of "tr:last-child" because of a Capybara bug. I see now why the tutorial didn't have us change the middle describe block.

So I went back and took a shot in the dark and tried giving an id of "destroy-link" to the <td> containing the 'Destroy' link. Capybara didn't like that:

     Failure/Error: within '#destroy_link' do

     Capybara::ElementNotFound:

       Unable to find css "#destroy_link"

     # ./posts_spec.rb:69:in `block (4 levels) in <top (required)>'

The 'Destroy' link is actually in a child of the td, so in hindsight I'm not too surprised that it didn't work. Looking at the code a second (fourth? fifth?) time, though, I had an idea. Can I select the td>tr ? 

Apparently not.

     Failure/Error: within 'tr>td' do

     Capybara::ElementNotFound:

       Unable to find css "tr>td"

     # ./posts_spec.rb:69:in `block (4 levels) in <top (required)>'

I tried it with and without the spaces on either side of the child '>'. No dice. Time for more digging through StackOverflow ;). 'Night, all!