'Tests the get_managers method.'

def test_groupmember_manager(self):

    norman = get_user_model().objects.get(username='norman')
    admin = get_user_model().objects.get(username='admin')
    self.assertFalse(self.bar.user_is_member(norman))
    self.bar.join(norman)
    self.assertTrue(self.bar.user_is_member(norman))
    self.assertTrue((norman not in self.bar.get_managers()))
    self.assertTrue((admin in self.bar.get_managers()))
