This tests the behaviour when one of multiple removals gets cancelled.  This
should result in cancelling the complete removal operation, that is, none of
previously confirmed removals are performed, either.

First we need to create the necessary links:

  >>> self.setRoles(('Manager',))
  >>> p = self.portal
  >>> self.setText(p.doc1, p.image1.tag() + ', ' + p.image2.tag())
  >>> self.setText(p.doc2, p.image1.tag() + ', ' + p.image3.tag())

Then we use a browser to try to delete the referenced images.  Before we
can do this we need to prevent the test framework from choking on the
exception we intentionally throw and also set up a referer for cancelling the
removal (see docs/testRemovalTriggersConfirmation.txt for more info about
both issues).  Also, we disable the event count helper (as set in
folder_contents), so that all tests written so far won't need modification:

  >>> self.setStatusCode('LinkIntegrityNotificationException', 200)
  >>> self.disableEventCountHelper()
  >>> browser = self.getBrowser(loggedIn=True)
  >>> browser.open('http://nohost/plone/folder_contents')
  >>> browser.addHeader('Referer', browser.url)
  >>> browser.getControl('Test Image 1').selected = True
  >>> browser.getControl('Test Image 2').selected = True
  >>> browser.getControl('Test Image 3').selected = True
  >>> browser.getControl('Delete').click()
  >>> browser.contents
  '...<a href="http://nohost/plone/image1"...Test Image 1...
   ...This...Image...is referenced by the following items:...
   ...<li>...href="http://nohost/plone/doc1"...Test Page 1...</li>...
   ...<li>...href="http://nohost/plone/doc2"...Test Page 2...</li>...
   ...Would you like to delete it anyway?...'
  >>> browser.getControl(name='delete').click()

Since separate events are fired for every item deleted by `manage_delObjects`
there is no way to handle all potential integrity breaches in one single form,
at least no general way. Therefore we are presented with several forms asking
for confirmation in regard to breaches caused by deleting the individual
items:

  >>> browser.contents
  '...<a href="http://nohost/plone/image2"...Test Image 2...
   ...This...Image...is referenced by the following items:...
   ...<li>...href="http://nohost/plone/doc1"...Test Page 1...</li>...
   ...Would you like to delete it anyway?...'
  >>> browser.getControl(name='delete').click()
  >>> browser.contents
  '...<a href="http://nohost/plone/image3"...Test Image 3...
   ...This...Image...is referenced by the following items:...
   ...<li>...href="http://nohost/plone/doc2"...Test Page 2...</li>...
   ...Would you like to delete it anyway?...'

Instead of also confirming the last removal we change our minds and cancel the
whole operation:

  >>> browser.getControl(name='cancel').click()
  >>> browser.url
  'http://nohost/plone/folder_contents'
  >>> browser.contents
  '...<dl class="portalMessage...Removal cancelled...</dl>...'

This should result in all images and references still being existent:

  >>> portal.image1
  <ATImage at /plone/image1>
  >>> portal.image2
  <ATImage at /plone/image2>
  >>> portal.image3
  <ATImage at /plone/image3>

  >>> ref = repr(portal.doc1.getReferences())
  >>> '<ATImage at /plone/image1>' in ref
  True
  >>> '<ATImage at /plone/image2>' in ref
  True
  >>> ref = repr(portal.doc2.getReferences())
  >>> '<ATImage at /plone/image1>' in ref
  True
  >>> '<ATImage at /plone/image3>' in ref
  True