public async Task SaveLoadFastResume()
        {
            await Manager.HashCheckAsync(false);

            Manager.MutableBitField.SetAll(true).Set(0, false);
            Manager.UnhashedPieces.SetAll(false).Set(0, true);

            var origUnhashed = new ReadOnlyBitField(Manager.UnhashedPieces);
            var origBitfield = new ReadOnlyBitField(Manager.Bitfield);
            await Manager.LoadFastResumeAsync(await Manager.SaveFastResumeAsync());

            Assert.IsTrue(origUnhashed.SequenceEqual(Manager.UnhashedPieces), "#3");
            Assert.IsTrue(origBitfield.SequenceEqual(Manager.Bitfield), "#4");
        }