public void CompareToIsImplemented()
        {
            ElectricField voltpermeter = ElectricField.FromVoltsPerMeter(1);

            Assert.Equal(0, voltpermeter.CompareTo(voltpermeter));
            Assert.True(voltpermeter.CompareTo(ElectricField.Zero) > 0);
            Assert.True(ElectricField.Zero.CompareTo(voltpermeter) < 0);
        }
        public void CompareToThrowsOnNull()
        {
            ElectricField voltpermeter = ElectricField.FromVoltsPerMeter(1);

            Assert.Throws <ArgumentNullException>(() => voltpermeter.CompareTo(null));
        }
        public void CompareToThrowsOnTypeMismatch()
        {
            ElectricField voltpermeter = ElectricField.FromVoltsPerMeter(1);

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