public void MFD_Send_DeviceOn() { MultifunctionalDevice device = new MultifunctionalDevice(); device.PowerOn(); var currentConsoleOut = Console.Out; currentConsoleOut.Flush(); using (var consoleOutput = new ConsoleRedirectionToStringWriter()) { IDocument doc1 = new PDFDocument("aaa.pdf"); device.Send(doc1, "*****@*****.**"); Assert.IsTrue(consoleOutput.GetOutput().Contains("sent")); } Assert.AreEqual(currentConsoleOut, Console.Out); }