public void TestParseMass()
{
var bioMassCalc = new BioMassCalc(MassType.Monoisotopic);
string description = "C'2";
Assert.AreEqual(26, bioMassCalc.ParseMass(ref description), .01);
Assert.AreEqual(string.Empty, description);
description = "-C'2";
Assert.AreEqual(0, bioMassCalc.ParseMass(ref description));
Assert.AreEqual("-C'2", description);
description = "C'2-C2";
Assert.AreEqual(26, bioMassCalc.ParseMass(ref description), .01);
Assert.AreEqual("-C2", description);
description = "C'2";
Assert.AreEqual(26, bioMassCalc.ParseMassExpression(ref description), .01);
Assert.AreEqual(string.Empty, description);
description = "C'2-C2";
Assert.AreEqual(2, bioMassCalc.ParseMassExpression(ref description), .01);
Assert.AreEqual(string.Empty, description);
description = "C'2-C2-N2";
Assert.AreEqual(2, bioMassCalc.ParseMassExpression(ref description), .01);
Assert.AreEqual("-N2", description);
Assert.AreEqual(2, bioMassCalc.CalculateMassFromFormula("C'2-C2"), .01);
AssertEx.ThrowsException <ArgumentException>(() => bioMassCalc.CalculateMassFromFormula("C'2-C2-N2"));
}