public void test_toString_formatter() {

    DateTimeFormatter f = DateTimeFormatters.pattern("y M d H m s");
    String t = LocalDateTime.of(2010, 12, 3, 11, 30, 45).toString(f);
    assertEquals(t, "2010 12 3 11 30 45");
  }

  @Test(expectedExceptions = NullPointerException.class, groups = { "tck" }