public void test_minus_Period_positiveMonths() {

    MockSimplePeriod period = MockSimplePeriod.of(7, ChronoUnit.MONTHS);
    LocalDateTime t = this.TEST_2007_07_15_12_30_40_987654321.minus(period);
    assertEquals(t, LocalDateTime.of(2006, 12, 15, 12, 30, 40, 987654321));
  }

  @Test(groups = { "tck" }