This tests makes sure items that are linked to can still be renamed (see the
related bug report in #6608).  First we need to create the necessary links:

  >>> self.setRoles(('Manager',))
  >>> markup = '<html> <body> <a href="doc2">doc2</a> </body> </html>'
  >>> portal.doc1.processForm(values={'text': markup})

Then we use a browser to rename the referenced image:

  >>> browser = self.getBrowser(loggedIn=True)
  >>> browser.open('http://nohost/plone/folder_contents')
  >>> browser.getControl('Test Page 2').selected = True
  >>> browser.getControl('Rename').click()
  >>> browser.getControl('New Short Name').value = 'nuname'
  >>> browser.getControl('New Title').value = 'NuName'
  >>> browser.getControl('Rename All').click()

Now the image should have a new id and title, which we check for:

  >>> portal.nuname
  <ATDocument at /plone/nuname>
  >>> portal.doc2
  Traceback (most recent call last):
  ...
  AttributeError: doc2

It should also be available under that name via the browser, of course:

  >>> browser.url
  'http://nohost/plone/@@folder_contents'
  >>> browser.getLink('NuName').click()
  >>> browser.url
  'http://nohost/plone/nuname'

Even clicking the original link should still lead us to the new location,
thanks to `plone.app.redirector`:

  >>> browser.goBack()
  >>> browser.getLink('Test Page 1').click()
  >>> browser.url
  'http://nohost/plone/doc1'
  >>> browser.contents
  '...<a href="doc2">doc2</a>...'
  >>> browser.getLink('doc2').click()
  >>> browser.url
  'http://nohost/plone/nuname'

Lastly we try to delete the referenced document, which should still give us a
warning about link integrity.  Before we can do this we need to prevent the
test framework from choking on the exception we intentionally throw (see
`docs/testRemovalTriggersConfirmation.txt` for more info):

  >>> self.setStatusCode('LinkIntegrityNotificationException', 200)
  >>> browser.getLink('Delete').click()
  >>> browser.contents
  '...<a href="http://nohost/plone/nuname"...NuName...
   ...This...Document...is referenced by the following items:...
   ...<li>...<a href="http://nohost/plone/doc1"...Test Page 1...</li>...
   ...Would you like to delete it anyway?...'

