public void NoDiffTests()
{
var fileSystem = new FileSystemBuilder().
File(new FileBuilder().
FilePath("artist - song").
Tag(FrameType.Artist, "artist").
Tag(FrameType.Title, "song").
Build()).
File(new FileBuilder().
FilePath("art - so").
Tag(FrameType.Artist, "art").
Tag(FrameType.Title, "so").
Build()).
Build();
var folderProcessor = new FolderProcessor(fileSystem,fileSystem);
var differences = folderProcessor.GetDifferences("", "<ar> - <ti>");
Assert.AreEqual(0,differences.Count);
}