@Test
  public void new_fieldsTest() {
    int length = 10;
    String name = "td";
    Tuple t = new Tuple(Utility.getTupleDesc(length, name));

    Iterator<Field> fs = t.fields();

    int i = 0;
    while (fs.hasNext()) {
      i++;
      fs.next();
    }

    assertEquals(length, i);
  }