How to create admin user in django tests.py

I'm trying to create an admin user as part of my tests.py to check on persmissions.

UPDATE: The tests.py is standard format that subclasses TestCase and the code below is called in the setUp() function.

I can create a normal user but not an admin user. If I try this:

    self.adminuser = User.objects.create_user('admin', 'admin@test.com', 'pass')
    self.adminuser.save()
    self.adminuser.is_staff = True
    self.adminuser.save()

OR self.adminuser = User.objects.create_superuser('admin', 'admin@test.com', 'pass') self.adminuser.save()

I get:

Warning: Data truncated for column 'name' at row 1

If I remove the is_staff line all is well (except I can't do my test!)

Do I have to load admin users as fixtures?

UserProfile is defined as follows:

class UserProfile(models.Model):

    user = models.ForeignKey(User, unique=True)
    organisation = models.ForeignKey(Organisation, null=True, blank=True)
    telephone = models.CharField(max_length=20, null=True, blank=True)

and full error traceback is:

    Traceback (most recent call last):
      File "/usr/lib/python2.4/site-packages/Django-1.1.1-py2.4.egg/django/test/testcases.py", line 242, in __call__
        self._pre_setup()
      File "/usr/lib/python2.4/site-packages/Django-1.1.1-py2.4.egg/django/test/testcases.py", line 217, in _pre_setup
        self._fixture_setup()
      File "/usr/lib/python2.4/site-packages/Django-1.1.1-py2.4.egg/django/test/testcases.py", line 440, in _fixture_setup
        return super(TestCase, self)._fixture_setup()
      File "/usr/lib/python2.4/site-packages/Django-1.1.1-py2.4.egg/django/test/testcases.py", line 222, in _fixture_setup
        call_command('flush', verbosity=0, interactive=False)
      File "/usr/lib/python2.4/site-packages/Django-1.1.1-py2.4.egg/django/core/management/__init__.py", line 166, in call_