'find lss for volume, which is in empty CG.'

def test_find_lss_for_volume_which_belongs_to_cg(self):

    self.configuration.lss_range_for_cg = '20-23'
    self.driver = FakeDS8KProxy(self.storage_info, self.logger, self.exception, self)
    self.driver.setup(self.ctxt)
    group_type = group_types.create(self.ctxt, 'group', {'consistent_group_snapshot_enabled': '<is>    True'})
    group = self._create_group(host=TEST_GROUP_HOST, group_type_id=group_type.id)
    volume = self._create_volume(group_id=group.id)
    lun = ds8kproxy.Lun(volume)
    self.driver._create_lun_helper(lun)
    (pid, lss) = lun.pool_lss_pair['source']
    self.assertTrue((lss in ['20', '21', '22', '23']))
