public void Should_Fill_File_With_Good_Text() { string[] args = new string[]{"get","-url","http://webbdoger93.free.fr/testNurl/hello.html","-save","C:/Bonjour.txt"}; Parser p = new Parser(args); p.parseArgs(); Core c = new Core(p.Line); Assert.IsTrue(c.executeSave()); Assert.AreEqual(File.Exists(args[4]),true); string content = String.Empty; using(FileStream fs = new FileStream(args[4],FileMode.Open)){ using(StreamReader sr = new StreamReader(fs)){ content=sr.ReadToEnd(); } } Assert.AreEqual("<h1>Hello test<h1>",content); }