[1.2.X] Fixed a test so that it actually tests what it's supposed to test.

  
Previously it passed whether or not the view was 'csrf_exempt'ed.

Backport of [13735] from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13736 bcc190cf-cafb-0310-a4f2-bffc1f526a37