public void test_isBefore() {

    assertTrue(this.TEST_2007_07_15.isBefore(LocalDate.of(2007, 07, 16)));
    assertFalse(this.TEST_2007_07_15.isBefore(LocalDate.of(2007, 07, 14)));
    assertFalse(this.TEST_2007_07_15.isBefore(this.TEST_2007_07_15));
  }

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