public void test_plusMinutes_minutes() {

    LocalDateTime ldt = LocalDateTime.of(2008, 6, 30, 23, 30, 59, 0);
    ZonedDateTime base = ZonedDateTime.of(ldt, ZONE_0100);
    ZonedDateTime test = base.plusMinutes(30);
    assertEquals(test, ZonedDateTime.of(ldt.plusMinutes(30), ZONE_0100));
  }

  // -----------------------------------------------------------------------
  // plusSeconds()
  // -----------------------------------------------------------------------
  @Test(groups = { "tck" }