public void ShouldReturnDifferentValueWhenChannelChanged()
            {
                ColorHSL first    = new ColorHSL(0.0, 0.0, 0.0);
                int      hashCode = first.GetHashCode();

                first.Hue = first.Saturation = first.Lightness = 1.0;
                Assert.NotEqual(hashCode, first.GetHashCode());
            }