public void StartHash()
{
const string fileName = "startHash.fr";
using (var fs = File.OpenWrite(fileName)) {
var data = Encoding.ASCII.GetBytes("just some data");
fs.Write(data, 0, data.Length);
}
var fi = new FileInfo(fileName);
var fr = new FileReference(fi);
fr.StartHash(fi).Wait();
Assert.NotNull(fr.Hash);
}