public void GetAllFiles()
{
var fileViewer = new FileViewer(_fileSystem);
var files = fileViewer.GetAllFiles(_tree);
var tree = new DirectoryTree(_tree);
tree.Files.Add(@"c:\myfile.txt");
tree.Files.Add(@"c:\picture.jpg");
tree.Files.Add(@"c:\anotherfile.txt");
tree.SubDirectories[1].Files.Add(@"c:\demo\jQuery.js");
tree.SubDirectories[1].Files.Add(@"c:\demo\sample.txt");
Assert.AreEqual(tree, files);
}