public String toString() {
      StringBuilder b = new StringBuilder();
      b.append("VariantContextTestData: [");
      final VariantContext vc = vcs.get(0);
      final VariantContextBuilder builder = new VariantContextBuilder(vc);
      builder.noGenotypes();
      b.append(builder.make().toString());
      if (vc.getNSamples() < 5) {
        for (final Genotype g : vc.getGenotypes()) b.append(g.toString());
      } else {
        b.append(" nGenotypes = ").append(vc.getNSamples());
      }

      if (vcs.size() > 1)
        b.append(" ----- with another ").append(vcs.size() - 1).append(" VariantContext records");
      b.append("]");
      return b.toString();
    }