public void CompareToIsImplemented()
        {
            Permeability henrypermeter = Permeability.FromHenriesPerMeter(1);

            Assert.Equal(0, henrypermeter.CompareTo(henrypermeter));
            Assert.True(henrypermeter.CompareTo(Permeability.Zero) > 0);
            Assert.True(Permeability.Zero.CompareTo(henrypermeter) < 0);
        }
        public void CompareToThrowsOnNull()
        {
            Permeability henrypermeter = Permeability.FromHenriesPerMeter(1);

            Assert.Throws <ArgumentNullException>(() => henrypermeter.CompareTo(null));
        }
        public void CompareToThrowsOnTypeMismatch()
        {
            Permeability henrypermeter = Permeability.FromHenriesPerMeter(1);

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