public void WhenTradeEventIsReceivedBiasRowIsRetrieivedAndBenchmarkWeightIsCalculatedAndBiasRowIsSaved()
        {
            int biasReportSessionId = 100;
            string ticker = "A";
            int tradeCount = 5;

            var repository = Substitute.For<IBiasReportRepository>();
            var existingBiasRow = new BiasRow {BiasSessionId = biasReportSessionId,TradeCount = 0, Ticker = "1"};
            repository.GetBiasRow(biasReportSessionId, ticker).Returns(existingBiasRow);

            var tradeEvent = new BiasTradeEvent { BiasSessionId = biasReportSessionId, Ticker = ticker, TradeAmount = tradeCount };

            var service = new BiasReportService(repository);
            service.UpdateTradeRow(tradeEvent);

            repository.Received().SaveBiasRow(existingBiasRow);
            Assert.That(existingBiasRow.TradeCount,Is.EqualTo(5));
            Assert.That(existingBiasRow.BenchmarkWeight, Is.EqualTo(tradeCount * .02m));
        }
 public void SaveBiasRow(BiasRow biasRow)
 {
     //not needed as everything is in memory.
 }