public void WafersToStreamTest()
        {
            IList<IWafer> wafers = PlcHelper.GetWaferList(30, 2);
            WafersToStreamConverter_Accessor target = new WafersToStreamConverter_Accessor();

            IntConverter converter = new IntConverter();

            string excepted = string.Empty;
            foreach (IWafer wafer in wafers)
            {
                excepted += converter.ToStream(wafer.CassetteNumber) + converter.ToStream(wafer.SlotNumber);
            }
            Assert.AreEqual<string>(excepted, target.WafersToStream(wafers));
        }