'Activation with a key that\'s invalid should make
``UserenaSignup.objects.activate_user`` return ``False``.'

def test_activation_invalid(self):

    self.assertFalse(UserenaSignup.objects.activate_user('wrong_key'))
    invalid_key = (10 * 'a1b2')
    self.assertFalse(UserenaSignup.objects.activate_user(invalid_key))
