public async Task Process_WhenCancelled_DoNotCallITransformProcessorTransform()
        {
            _CancellationTokenSource.Cancel();

            Func <Task> act = () => _TransformerProcessorAdapter.Process(0, _BackBone, _Progess, _CancellationTokenSource.Token);

            act.ShouldThrow <TaskCanceledException>();

            await _Transform.DidNotReceive().Transform(0, _Progess, _CancellationTokenSource.Token);
        }