public void AddFormulaToFormula()
{
ChemicalFormula formulaA = new ChemicalFormula("C2H3NO");
ChemicalFormula formulaB = new ChemicalFormula("H2O");
ChemicalFormula formulaC = new ChemicalFormula("C2H5NO2");
formulaA.Add(formulaB);
Assert.AreEqual(formulaA, formulaC);
}