public virtual void TestRemoveAllIsotopes()
{
IMolecularFormula mf = Builder.NewMolecularFormula();
IIsotope carb = Builder.NewIsotope("C");
IIsotope flu = Builder.NewIsotope("F");
IIsotope h1 = Builder.NewIsotope("H");
mf.Add(carb);
mf.Add(flu);
mf.Add(h1, 3);
// remove the Fluorine
mf.Clear();
Assert.AreEqual(0, mf.IsotopesCount);
}