public void ImplicitAddNullFormulaLeft()
{
ChemicalFormula formulaA = new ChemicalFormula("C2H3NO");
ChemicalFormula formulaB = new ChemicalFormula("C2H3NO");
ChemicalFormula formulaC = NullChemicalFormula + formulaA;
Assert.AreEqual(formulaC, formulaB);
}