public void CantAddPeripheralDevice()
 {
     using(EF_ZMT_DbContext.EF_ZMT_DbContext context = new EF_ZMT_DbContext.EF_ZMT_DbContext())
     {
         FixedAssetService transaction = new FixedAssetService();
         context.Context.ExecuteStoreCommand("DELETE FROM PeripheralDevice");
         PeripheralDevice device = new PeripheralDevice() { name = "printer" };
         transaction.AddPeripheralDevice(device);
         Assert.AreEqual(context.Context.PeripheralDevices.Count(), 1);
         device = context.Context.PeripheralDevices.FirstOrDefault(x => x.name == "printer");
         Assert.IsNotNull(device);
     }
 }