    @Test
    public void codeGT() throws Exception {

        SortedSet<String> alts = new ObjectAVLTreeSet<>();
        alts.add("G");
        Set<String> to = new ObjectArraySet<>();
        to.add("G");
        to.add("C");
        //to = G/C
        assertEquals("0/1", PredictG.codeGT(to, "C", alts));
        to.remove("C");
        //to = G/G
        assertEquals("1", PredictG.codeGT(to, "C", alts));
        to.remove("G");
        to.add("C");
        //to = C/C
        assertEquals("0", PredictG.codeGT(to, "C", alts));
    }