Django unit test - Url testing

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I am want to write django 1.1 test case on fedora 12 x86_64.
To test the url I want to session to be persistent so that the next
test can use the same context. I can use client.login() method becoz
in the application login is rewritten.

If I directly use
kwargs = {'HTTP_X_REQUESTED_WITH':'XMLHttpRequest'}
response = self.client.post('/login/', {'username': 't...@test.com',
'password': 'test01', 'domain':'demo1'}, **kwargs)
This works fine but I am not able to test the next url. It's trowing
following error
WARNING:root:Caught an exception while processing permission:
{'content': 'MSHTML', 'name': 'GENERATOR', 'group_name': ''}
ERROR:root:Permission matching query does not exist.
Traceback (most recent call last):
  File "/home/sungard/Portals/trunk/django/portal/../portal/auth.py",
line 143, in authenticate
    perm = Permission.objects.get(codename = codename)
  File "/usr/lib/python2.6/site-packages/django/db/models/manager.py",
line 120, in get
    return self.get_query_set().get(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/django/db/models/query.py",
line 305, in get
    % self.model._meta.object_name)
DoesNotExist: Permission matching query does not exist.

Please suggest. 

Original issue reported on code.google.com by Pradnya....@gmail.com on 14 Jul 2010 at 8:04

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Original comment by kr.krist...@gmail.com on 7 Aug 2013 at 2:35