public void CompareToIsImplemented()
        {
            CatalyticActivity katal = CatalyticActivity.FromKatals(1);

            Assert.Equal(0, katal.CompareTo(katal));
            Assert.True(katal.CompareTo(CatalyticActivity.Zero) > 0);
            Assert.True(CatalyticActivity.Zero.CompareTo(katal) < 0);
        }
        public void CompareToThrowsOnNull()
        {
            CatalyticActivity katal = CatalyticActivity.FromKatals(1);

            Assert.Throws <ArgumentNullException>(() => katal.CompareTo(null));
        }
        public void CompareToThrowsOnTypeMismatch()
        {
            CatalyticActivity katal = CatalyticActivity.FromKatals(1);

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