    @Test
    public void testGetFirstMapping() {

        ////////System.out.println("getFirstMapping");
        IAtom atomSource = new Atom("R");
        IAtom atomTarget = new Atom("R");
        IAtomContainer source = new AtomContainer();
        source.addAtom(atomSource);
        IAtomContainer target = new AtomContainer();
        target.addAtom(atomTarget);
        SingleMappingHandler instance = new SingleMappingHandler(source, target, false);
        Assert.assertNotNull(instance.getFirstAtomMapping());
    }