private DeviceBase CreateDevice(string GUI_ID = null) { if (string.IsNullOrEmpty(GUI_ID)) { GUI_ID = Guid.NewGuid().ToString(); } var sn = String.Format("{0}", GUI_ID, GUI_ID); var result = Repository.AddDevice(sn, 1); Assert.IsTrue(result != null && result != -1); var devcie = Repository.GetDevice(sn); Assert.IsTrue(devcie != null && devcie.DeviceID == result.Value); return(devcie); }