public void test_minus_Duration_zero() {

    OffsetDateTime t = this.TEST_2008_6_30_11_30_59_000000500.minus(Duration.ZERO);
    assertEquals(t, this.TEST_2008_6_30_11_30_59_000000500);
  }

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