public void ClearAllMods()
{
ChemicalFormula formula = new ChemicalFormula("Fe");
_mockPeptideEveryAminoAcid.SetModification(formula, ModificationSites.All);
_mockPeptideEveryAminoAcid.ClearModifications();
Assert.AreEqual("ACDEFGHIKLMNPQRSTVWY", _mockPeptideEveryAminoAcid.ToString());
}