assertContains() - AttributeError

[b23dev@…]

I get a AttributeError when I try the django test client method assertContains():
(found assertContains() in the documentation, ​http://www.djangoproject.com/documentation/testing/)

class TestUsers(unittest.TestCase):

    def setUp(self):
        self.client = Client()

    def testUsername(self):
        response = self.client.get('/username/')
        self.assertContains(response, "actionjakson", count=None, status_code=200)

i got this traceback:

Traceback (most recent call last):
  File "/home/src/vp/../vp/portal/tests.py", line 49, in testUsername
    self.assertContains(response, "actionjakson", count=None, status_code=200)
AttributeError: 'TestUsers' object has no attribute 'assertContains'

I'm using a fresh django svn checkout.

[Matt McClanahan]

assertContains is a method added by Django's TestCase class, which subclasses the standard Python unittest.TestCase. Your test case is extending the standard Python TestCase rather than Django's.

See: ​http://www.djangoproject.com/documentation/testing/#testcase