private void AddBook(string id, string title)
{
var b = new Mock<BookInfo>();
b.SetupGet(x => x.Id).Returns(id);
b.SetupGet(x => x.QuickTitleUserDisplay).Returns(title);
b.SetupGet(x => x.FolderPath).Returns(Path.GetTempPath);//TODO. this works at the moment, cause we just need some folder which exists
_bookInfoList.Add(b.Object);
}