public void ShowError(WorkshopError error)
        {
            var original = _image.color;

            _image.color = Color.red;

            Observable.Timer(TimeSpan.FromSeconds(.5))
            .Subscribe(_ => _image.color = original);
        }
 public static void Assert_FailsWith(this Maybe <WorkshopError> result, WorkshopError error)
 => result.Should().Be(error.ToMaybe());