@Test
public void napthaleneWithDoubleBondsAndHydrogenHeightTest() {

    IAtomContainer napthalene = builder.newInstance(IAtomContainer.class);
    for (int i = 0; i < 10; i++) {
        napthalene.addAtom(builder.newInstance(IAtom.class, "C"));
    }
    napthalene.addBond(0, 1, IBond.Order.SINGLE);
    napthalene.addBond(0, 5, IBond.Order.DOUBLE);
    napthalene.addBond(1, 2, IBond.Order.DOUBLE);
    napthalene.addBond(1, 6, IBond.Order.SINGLE);
    napthalene.addBond(2, 3, IBond.Order.SINGLE);
    napthalene.addBond(2, 9, IBond.Order.SINGLE);
    napthalene.addBond(3, 4, IBond.Order.DOUBLE);
    napthalene.addBond(4, 5, IBond.Order.SINGLE);
    napthalene.addBond(6, 7, IBond.Order.DOUBLE);
    napthalene.addBond(7, 8, IBond.Order.SINGLE);
    napthalene.addBond(8, 9, IBond.Order.DOUBLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(0, 10, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(3, 11, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(4, 12, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(5, 13, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(6, 14, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(7, 15, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(8, 16, IBond.Order.SINGLE);
    napthalene.addAtom(builder.newInstance(IAtom.class, "H"));
    napthalene.addBond(9, 17, IBond.Order.SINGLE);
    int height = 2;
    SignatureQuotientGraph mqg = new SignatureQuotientGraph(napthalene, height);
    Assert.assertEquals(4, mqg.getVertexCount());
    Assert.assertEquals(6, mqg.getEdgeCount());
    Assert.assertEquals(2, mqg.numberOfLoopEdges());
}