@Test
public void generatesCarbon13() {

    IAtomContainer container = mock(IAtomContainer.class);
    IAtom atom = mock(IAtom.class);
    when(atom.getAtomicNumber()).thenReturn(6);
    when(atom.getMassNumber()).thenReturn(13);
    when(atom.getImplicitHydrogenCount()).thenReturn(0);
    when(atom.getFormalCharge()).thenReturn(0);
    RendererModel model      = new RendererModel();
    model.registerParameters(new StandardGenerator(new Font(Font.SANS_SERIF, Font.PLAIN, 12)));
    AtomSymbol atomSymbol = atomGenerator.generateSymbol(container, atom, HydrogenPosition.Left, model);
    List<Shape> shapes = atomSymbol.getOutlines();
    assertThat(shapes.size(), is(2));
}