public void test_plusYears() {

    assertEquals(Year.of(2007).plusYears(-1), Year.of(2006));
    assertEquals(Year.of(2007).plusYears(0), Year.of(2007));
    assertEquals(Year.of(2007).plusYears(1), Year.of(2008));
    assertEquals(Year.of(2007).plusYears(2), Year.of(2009));

    assertEquals(Year.of(Year.MAX_YEAR - 1).plusYears(1), Year.of(Year.MAX_YEAR));
    assertEquals(Year.of(Year.MAX_YEAR).plusYears(0), Year.of(Year.MAX_YEAR));

    assertEquals(Year.of(Year.MIN_YEAR + 1).plusYears(-1), Year.of(Year.MIN_YEAR));
    assertEquals(Year.of(Year.MIN_YEAR).plusYears(0), Year.of(Year.MIN_YEAR));
  }

  @Test(groups = { "tck" }