public override void TestIsEmpty()
{
IRingSet ringSet = (IRingSet)NewChemObject();
Assert.IsTrue(ringSet.IsEmpty(), "new ringset should be empty");
ringSet.Add(ringSet.Builder.NewRing()); // NCDK does not suppor to add AtomContainer object to RingSet object
Assert.IsFalse(ringSet.IsEmpty(), "ringset with an atom container should not be empty");
ringSet.Clear();
Assert.IsTrue(ringSet.IsEmpty(), "ringset with removed atom containers should be empty");
}
