@Test
public void testNullGivesFallback() throws Exception {

        String fname = "youhou";
        categorize.setLookupValue(new RealAttribute(fname));
        categorize.put(t1, class2);
        HashMap<String, Object> hm = new HashMap<String, Object>();
        hm.put(fname, null);
        Color cpm = categorize.getColor(hm);
        assertTrue(cpm == categorize.getFallbackValue().getColor(null, -1));
}