public void testMinLengthConstraint() {
    Constraint p = new StringLengthConstraint(RelationalOperator.GREATER_THAN_EQUAL_TO, 5);
    assertFalse(p.test(null));
    assertTrue(p.test(new Integer(12345)));
    assertFalse(p.test(new Integer(1234)));
    assertTrue(p.test("1234567890"));
    assertFalse(p.test("1234"));
  }
  public void testRangeConstraint() {
    Constraint p = new Range(new Integer(0), new Integer(10));