''

def test_join(self):

    member = {'host': 'fake-host', 'topic': 'compute'}
    group = 'group'
    self.driver.join = mock.MagicMock(return_value=None)
    result = self.servicegroup_api.join(member, group)
    self.assertIsNone(result)
    self.driver.join.assert_called_with(member, group, None)
