'Volume extended_volume successfully.'

@mock.patch.object(proxy.RESTProxy, '_get_fss_volume_name', return_value=VOLUME_NAME)
def test_extend_volume(self, mock__get_fss_volume_name):

    self.driver.proxy.extend_vdev = mock.Mock()
    result = self.driver.extend_volume(VOLUME, EXTENT_NEW_SIZE)
    mock__get_fss_volume_name.assert_called_once_with(VOLUME)
    self.driver.proxy.extend_vdev.assert_called_once_with(VOLUME_NAME, VOLUME['size'], EXTENT_NEW_SIZE)
    self.assertIsNone(result)
