@Test
public void methylamine() {

    IAtomContainer container = new AtomContainer(7, 6, 0, 0);
    container.addAtom(atom("H", 0));
    container.addAtom(atom("N", 0));
    container.addAtom(atom("H", 0));
    container.addAtom(atom("C", 0));
    container.addAtom(atom("H", 0));
    container.addAtom(atom("H", 0));
    container.addAtom(atom("H", 0));
    container.addBond(0, 1, IBond.Order.SINGLE);
    container.addBond(1, 2, IBond.Order.SINGLE);
    container.addBond(1, 3, IBond.Order.SINGLE);
    container.addBond(3, 4, IBond.Order.SINGLE);
    container.addBond(3, 5, IBond.Order.SINGLE);
    container.addBond(3, 6, IBond.Order.SINGLE);
    String[] expected = {"HNR", "NR", "HNR", "CR", "HC", "HC", "HC"};
    String[] actual = INSTANCE.symbolicTypes(container);
    Assert.assertArrayEquals(expected, actual);
}