private static void addGenotypesAndGTests() {
    //        for ( final int ploidy : Arrays.asList(2)) {
    for (final int ploidy : Arrays.asList(1, 2, 3, 4, 5)) {
      final List<List<String>> alleleCombinations =
          Arrays.asList(
              Arrays.asList("A"),
              Arrays.asList("A", "C"),
              Arrays.asList("A", "C", "G"),
              Arrays.asList("A", "C", "G", "T"));

      for (final List<String> alleles : alleleCombinations) {
        final VariantContextBuilder vcb = builder().alleles(alleles);
        final VariantContext site = vcb.make();
        final int nAlleles = site.getNAlleles();
        final Allele ref = site.getReference();

        // base genotype is ref/.../ref up to ploidy
        final List<Allele> baseGenotype = new ArrayList<Allele>(ploidy);
        for (int i = 0; i < ploidy; i++) baseGenotype.add(ref);
        final int nPLs = GenotypeLikelihoods.numLikelihoods(nAlleles, ploidy);

        // ada is 0, 1, ..., nAlleles - 1
        final List<Integer> ada = new ArrayList<Integer>(nAlleles);
        for (int i = 0; i < nAlleles - 1; i++) ada.add(i);

        // pl is 0, 1, ..., up to nPLs (complex calc of nAlleles and ploidy)
        final int[] pl = new int[nPLs];
        for (int i = 0; i < pl.length; i++) pl[i] = i;

        final GenotypeBuilder gb = new GenotypeBuilder("ADA_PL_SAMPLE");
        gb.alleles(baseGenotype);
        gb.PL(pl);
        gb.attribute("ADA", nAlleles == 2 ? ada.get(0) : ada);
        vcb.genotypes(gb.make());

        add(vcb);
      }
    }
  }