public void ChemicalForulaIsNotSuperSet()
        {
            ChemicalFormula formulaA = new ChemicalFormula("C2H3NO2");
            ChemicalFormula formulaB = new ChemicalFormula("C3H3NO");

            Assert.IsFalse(formulaB.IsSuperSetOf(formulaA));
        }
        public void ChemicalForulaIsSuperSet()
        {
            ChemicalFormula formulaA = new ChemicalFormula("C2H3NO");
            ChemicalFormula formulaB = new ChemicalFormula("C3H3NO");

            Assert.IsTrue(formulaB.IsSuperSetOf(formulaA));
        }