public void CompareToIsImplemented()
        {
            RadiantIntensity wattpersteradian = RadiantIntensity.FromWattPerSteradians(1);

            Assert.Equal(0, wattpersteradian.CompareTo(wattpersteradian));
            Assert.True(wattpersteradian.CompareTo(RadiantIntensity.Zero) > 0);
            Assert.True(RadiantIntensity.Zero.CompareTo(wattpersteradian) < 0);
        }
        public void CompareToThrowsOnNull()
        {
            RadiantIntensity wattpersteradian = RadiantIntensity.FromWattPerSteradians(1);

            Assert.Throws <ArgumentNullException>(() => wattpersteradian.CompareTo(null));
        }
        public void CompareToThrowsOnTypeMismatch()
        {
            RadiantIntensity wattpersteradian = RadiantIntensity.FromWattPerSteradians(1);

            Assert.Throws <ArgumentException>(() => wattpersteradian.CompareTo(new object()));
        }