public async Task GetLatestData()
{
string numbers = "1 5 6";
string path = "file01.txt";
var mockFileService = new Mock <IFileService>();
mockFileService
.Setup(f => f.ReadFromLastAvailableFile(It.IsAny <Stack <FileInfo> >()))
.ReturnsAsync(new Tuple <string, string>(numbers, path));
var sortingService = new SortingService(mockFileService.Object);
SavedData result = await sortingService.GetLatestData();
Assert.Equal(numbers, result.OrderedNumbers);
Assert.Equal(path, result.FileName);
}