public void addMappingTest()
        {
            mapping mymap = new mapping();

            singleMapping sm   = new singleMapping();
            int           lval = mymap.addMapping(sm);

            Assert.AreEqual(lval, 0);

            singleMapping sm2 = new singleMapping();

            lval = mymap.addMapping(sm2);

            Assert.AreEqual(lval, 1);

            // now add a few
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            // there are now 7

            Assert.AreEqual(mymap.getNMaps(), 7);
            mymap.dumpMap();

            mymap.removeMapping(3);
            // thre should now be 6
            Assert.AreEqual(mymap.getNMaps(), 6);
            mymap.dumpMap();

            mymap.removeMapping(3);
            // there should now be 5
            Assert.AreEqual(mymap.getNMaps(), 5);
            mymap.dumpMap();

            mymap.removeMapping(3);
            Assert.AreEqual(mymap.getNMaps(), 4);

            mymap.dumpMap();

            mymap.removeMapping(3);
            Assert.AreEqual(mymap.getNMaps(), 3);
            mymap.removeMapping(3);
            Assert.AreEqual(mymap.getNMaps(), 3);
            mymap.removeMapping(3);
            Assert.AreEqual(mymap.getNMaps(), 3);
            mymap.dumpMap();
            mymap.removeMapping(0);
            Assert.AreEqual(mymap.getNMaps(), 2);
            mymap.dumpMap();
            mymap.removeMapping(0);
            Assert.AreEqual(mymap.getNMaps(), 1);
            mymap.dumpMap();
            mymap.removeMapping(0);
            Assert.AreEqual(mymap.getNMaps(), 0);
            mymap.dumpMap();

            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);
            mymap.addMapping(sm2);

            // now test the dump
            String  du     = mymap.toString();
            mapping newMap = new mapping();

            newMap.fromString(du);

            Assert.AreEqual(du, newMap.toString());
        }