@DataProvider(name = "toString")
  Object[][] data_toString() {

    return new Object[][] { { ThaiBuddhistChrono.INSTANCE.date(544, 1, 1), "ThaiBuddhist BE 544-01-01" },
        { ThaiBuddhistChrono.INSTANCE.date(2271, 10, 28), "ThaiBuddhist BE 2271-10-28" },
        { ThaiBuddhistChrono.INSTANCE.date(2271, 10, 29), "ThaiBuddhist BE 2271-10-29" },
        { ThaiBuddhistChrono.INSTANCE.date(2270, 12, 5), "ThaiBuddhist BE 2270-12-05" },
        { ThaiBuddhistChrono.INSTANCE.date(2270, 12, 6), "ThaiBuddhist BE 2270-12-06" }, };
  }

  @Test(dataProvider = "toString", groups = { "tck" }