public void CompareToThrowsOnNull()
        {
            SpecificVolume cubicmeterperkilogram = SpecificVolume.FromCubicMetersPerKilogram(1);

            Assert.Throws <ArgumentNullException>(() => cubicmeterperkilogram.CompareTo(null));
        }
        public void CompareToThrowsOnTypeMismatch()
        {
            SpecificVolume cubicmeterperkilogram = SpecificVolume.FromCubicMetersPerKilogram(1);

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