public void CompareToIsImplemented()
        {
            AreaVolumeRation squaremeterperliter = AreaVolumeRation.FromSquareMeterPerLiters(1);

            Assert.Equal(0, squaremeterperliter.CompareTo(squaremeterperliter));
            Assert.True(squaremeterperliter.CompareTo(AreaVolumeRation.Zero) > 0);
            Assert.True(AreaVolumeRation.Zero.CompareTo(squaremeterperliter) < 0);
        }
        public void CompareToThrowsOnNull()
        {
            AreaVolumeRation squaremeterperliter = AreaVolumeRation.FromSquareMeterPerLiters(1);

            Assert.Throws <ArgumentNullException>(() => squaremeterperliter.CompareTo(null));
        }
        public void CompareToThrowsOnTypeMismatch()
        {
            AreaVolumeRation squaremeterperliter = AreaVolumeRation.FromSquareMeterPerLiters(1);

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