'find LSS should choose the emptiest one.'

@mock.patch.object(helper.DS8KCommonHelper, 'get_all_lss')
def test_find_lss_should_choose_emptiest_one(self, mock_get_all_lss):

    mock_get_all_lss.return_value = [{'id': TEST_LSS_ID_1, 'group': '0', 'addrgrp': '0', 'type': 'fb', 'configvols': '200'}, {'id': TEST_LSS_ID_2, 'group': '0', 'addrgrp': '0', 'type': 'fb', 'configvols': '100'}, {'id': TEST_LSS_ID_3, 'group': '0', 'addrgrp': '0', 'type': 'fb', 'configvols': '150'}]
    cmn_helper = FakeDS8KCommonHelper(self.configuration, None)
    (pool_id, lss_id) = cmn_helper.find_pool_lss_pair(None, False, set())
    self.assertEqual(TEST_LSS_ID_2, lss_id)
