public void SetAminoAcidModification()
{
ChemicalFormula formula = new ChemicalFormula("Fe");
_mockPeptideEveryAminoAcid.SetModification(formula, AminoAcid.Asparagine);
Assert.AreEqual("ACDEFGHIKLMN[Fe]PQRSTVWY", _mockPeptideEveryAminoAcid.ToString());
}