public void TestMapInverseShouldReturnCorrectValues(string date, byte red, byte green, byte blue)
        {
            _map = new DateTimeToColorMap(
                DateTime.MinValue,
                DateTime.MaxValue,
                _colorPalette.Colors,
                SortOrder.Descending);
            var color  = new Color(red, green, blue);
            var value  = DateTime.Parse(date);
            var result = _map.MapInverse(color);

            Assert.That(((DateTime)result).Date, Is.EqualTo(value.Date));
        }