public void ChooseEmptyServer()
        {
            var configuration     = ServiceProvider.Configuration <BalancerConfiguration>();
            var maxSessions       = configuration.GetMaxSessionsParameter(QueryType.Oltp);
            var statisticsStorage = ServiceProvider.Resolve <IStatisticsStorage>();
            var someOccupiedHost  = new Server {
                Host = "192.168.0.3"
            };
            var someEmptyHost = new Server {
                Host = "192.168.0.4"
            };
            var maxSessionsStats = new Statistics {
                IsOnline = true, CurrentSessionsCount = 5
            };

            SetLocalhostStatisticsAsOnline(statisticsStorage);

            statisticsStorage.Set(QueryType.Oltp, someOccupiedHost, maxSessionsStats);
            statisticsStorage.Set(QueryType.Oltp, someEmptyHost, new Statistics {
                IsOnline = true
            });
            var oltpServers = statisticsStorage.Get(QueryType.Oltp);

            var decider         = ServiceProvider.Resolve <IServerDecider>();
            var availableServer = decider.FindAvailableServer(oltpServers, maxSessions);

            Assert.AreNotEqual(availableServer, someOccupiedHost);

            statisticsStorage.ReloadFromConfiguration();
        }