public void testTupleBuiltin() throws EvaluationException {
    list_1 = new org.deri.iris.terms.concrete.List();
    list_1.add(ONE);
    list_1.add(TWO);
    list_1.add(TWO);
    list_1.add(FOUR);

    expected = new org.deri.iris.terms.concrete.List();
    expected.add(ONE);
    expected.add(TWO);
    expected.add(FOUR);

    check(list_1, expected);
  }
  public void testBuiltin() throws EvaluationException {
    try {
      builtin = new DistinctValuesBuiltin();
      System.out.println(builtin.toString());
      fail(
          "An IllegalArgumentException should be thrown if builtin has the wrong amount of paramenters.");
    } catch (IllegalArgumentException e) {
    }
    builtin = new DistinctValuesBuiltin(EMPTY_LIST);

    //
    list_1 = new org.deri.iris.terms.concrete.List();
    expected = new org.deri.iris.terms.concrete.List();

    assertEquals(expected, builtin.computeResult(list_1));

    list_2 = new org.deri.iris.terms.concrete.List();
    list_2.add(ONE);
    expected = new org.deri.iris.terms.concrete.List();
    expected.add(ONE);
    assertEquals(expected, builtin.computeResult(list_2));

    list_3 = new org.deri.iris.terms.concrete.List();
    list_3.add(ONE);
    list_3.add(ONE);
    assertEquals(expected, builtin.computeResult(list_3));
    assertEquals(list_2, builtin.computeResult(list_3));

    // External( func:distinct-values(List(0 1 2 3 4)) ) = List(0 1 2 3 4)
    list_1.clear();
    list_1.add(ZERO);
    list_1.add(ONE);
    list_1.add(TWO);
    list_1.add(THREE);
    list_1.add(FOUR);

    expected.clear();
    expected.add(ZERO);
    expected.add(ONE);
    expected.add(TWO);
    expected.add(THREE);
    expected.add(FOUR);

    assertEquals(expected, builtin.computeResult(list_1));

    // External( func:distinct-values(List(0 1 2 3 4 0 4)) ) = List(0 1 2 3
    // 4)
    list_1.add(ZERO);
    list_1.add(FOUR);
    assertEquals(expected, builtin.computeResult(list_1));

    // External( func:distinct-values(List(3 3 3)) ) = List(3)
    list_1.clear();
    list_1.add(THREE);
    list_1.add(THREE);
    list_1.add(THREE);

    expected.clear();
    expected.add(THREE);
    assertEquals(expected, builtin.computeResult(list_1));
  }