public void GetFiles() { var fileViewer = new FileViewer(_fileSystem); var files = fileViewer.GetFiles(@"c:\"); Assert.AreEqual(3, files.Length); Assert.IsTrue(files.Contains(@"c:\myfile.txt")); Assert.IsTrue(files.Contains(@"c:\picture.jpg")); Assert.IsTrue(files.Contains(@"c:\anotherfile.txt")); }