public void test_minus_Period_negativeDays() {

    MockSimplePeriod period = MockSimplePeriod.of(-25, ChronoUnit.DAYS);
    LocalDate t = this.TEST_2007_07_15.minus(period);
    assertEquals(t, LocalDate.of(2007, 8, 9));
  }

  @Test(groups = { "tck" }