'when all LSSs are exhausted should raise exception.'

@mock.patch.object(helper.DS8KCommonHelper, '_find_lss')
def test_find_lss_when_all_lss_exhausted(self, mock_find_lss):

    cmn_helper = FakeDS8KCommonHelper(self.configuration, None)
    mock_find_lss.return_value = None
    self.assertRaises(restclient.LssIDExhaustError, cmn_helper.find_pool_lss_pair, None, False, None)
